Best Roof Measuring Software for 2026: 10 Options Compared by Use Case
Compare the 10 best roof measuring software options on price per report, turnaround and accuracy, with every price checked November 8, 2026.
We compare pricing pages, documentation and public reviews. We never accept payment for rankings.

Key takeaways
- Roofr is the best fit for most roofers — free to start, reports $13 each on paid plans; EagleView is the accuracy standard at $18 a report, and RoofSnap is the DIY pick at $105 per user a month.
- The single most important buying factor is the pricing model: per-report, per-project, flat subscription or custom quote — and the model that looks cheapest at one roof a month is rarely cheapest at twenty.
- No tool here measures everything: aerial reports skip new builds without imagery, phone scans need a site visit, and drone tools need a pilot and a drone.
- Per-report prices run $13 to $87 depending on depth, while unlimited-measurement subscriptions run $89 to $349 a month — match the model to how many roofs you measure, not to the headline price.
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Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|---|---|---|
| Roofr | Residential roofers who want measurements, proposals, e-signatures and payments in one modern tool | Free; Measure+ $109/mo | Yes (free plan) |
| EagleView | Contractors and adjusters who need defensible aerial roof measurements without buying or flying a drone | $18/report | No |
| RoofSnap | Solo roofers and small crews who want to trace roofs themselves and turn measurements into good-better-best proposals | $105/user/mo | No (PAYG from $13) |
| HOVER | Exterior contractors who want a measured 3D model of a whole house from smartphone photos, no drone required | Free; scans $29-$69 | Yes (free plan) |
| iRoofing | High-volume roofers who measure a dozen or more roofs a month and want a flat rate instead of per-report fees | $149/mo | No (7-day trial) |
| GAF QuickMeasure | GAF contractors who need one fast, cheap aerial report for a single-family bid | $18/report | No (pay per report) |
| RoofScope | Contractors and adjusters who want CAD-reviewed aerial measurement reports with fast turnaround | $89/mo | No (free trial) |
| AccuLynx | Established roofing companies doing insurance restoration who need CRM, estimating and production in one system | Custom quote | No |
| DroneDeploy | Contractors and inspectors who already fly drones and want flight planning, cloud processing and 3D models in one platform | $349/mo | No (free trial) |
| Pix4D | Surveyors, engineers and forensic investigators who need survey-grade photogrammetry and defensible measurements | $333/mo | No (15-day trial) |
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Request a listingThe best roof measuring software
Roofr
Best for: Residential roofers who want measurements, proposals, e-signatures and payments in one modern tool
Roofr is the fastest route from a street address to a signed proposal. The free Starter plan orders measurement reports for $19 each, and the first paid plan, Measure+ at $109 a month, drops reports to $13 with delivery in as little as two hours. Measurements flow straight into branded proposals with e-signatures, invoices and payments, so a rep can quote in the driveway instead of back at the office.
The catch is that reports are always an extra charge, even on paid plans, and the cheapest way to run the whole business — proposals, payments and CRM — is Essentials at $249 a month. Add-ons such as the Instant Estimator and Roofr Sites cost extra. Buy Roofr when you want measuring and selling in one tool; buy EagleView when the report itself must carry an insurance claim.
What we like
- Free Starter plan with unlimited users on every plan, no per-seat fees
- Measurement reports in as little as 2 hours, flowing straight into branded proposals
- Verisk-certified ESX export drops measurements into Xactimate for $10 per report
- Modern interface that sales reps can run from the field on a phone
Watch out for
- Measurement reports are always extra, $13 each on paid plans and $19 on Starter
- Measurement depth is thinner than EagleView on complex commercial roofs
- Add-ons such as Instant Estimator and Roofr Sites cost $99-$125 a month each
EagleView
Best for: Contractors and adjusters who need defensible aerial roof measurements without buying or flying a drone
EagleView built the aerial measurement category, and insurers and adjusters argue with its reports least. A Bid Perfect report costs $18 and covers squares and dimensions for a quick bid; Premium reports run $32.75 to $87 for a residential roof depending on size and tier, with commercial reports from $89.50. Its imagery comes from EagleView's own aircraft, not satellites, with independent testing at 98.77% accuracy on roof lines.
The trade-off is cost at volume: no subscription bundles reports. Ordering dozens of Premium reports a month becomes a real budget line, and the EagleView One subscription and Platinum tier are priced by quote. Turnaround runs from same-day to three days depending on the report. Buy EagleView when the measurement must stand up in a claim; buy Roofr or RoofSnap when speed and a low per-job cost matter more.
What we like
- The industry standard for aerial roof measurements, trusted by insurers and contractors
- Huge aircraft-captured imagery library covers most US properties
- Independent CompassData testing measured roof lines at 98.77% accuracy
- Integrates with Xactimate and roofing CRMs such as AccuLynx
Watch out for
- Per-report pricing adds up fast at high volume
- Imagery may be months old where a fresh drone flight would be current
- EagleView One subscription and Platinum pricing are by quote
RoofSnap
Best for: Solo roofers and small crews who want to trace roofs themselves and turn measurements into good-better-best proposals
RoofSnap suits the estimator who likes to trace the roof themselves. Pay-as-you-go Half Snap reports start at $13 and Full Snaps run $35 to $55 by roof size, while the monthly subscription costs $105 per user and adds unlimited draw-it-yourself measurements, estimating, material orders, contracts and payments. Reports arrive in about four hours, with a 30-minute rush option.
The subscription is priced per user, so a five-person crew pays five times the single-user rate, and annual billing drops the per-user price to $52 to $78 depending on team size. Coverage can be patchy in rural areas where the imagery library is thinner. Buy RoofSnap when you want to draw your own measurements and turn them into a proposal in the same tool; buy EagleView when you want a fully done-for-you report.
What we like
- Pay-as-you-go measurement reports from $13, with no subscription required
- Draw-it-yourself sketching mirrors how estimators already take off a roof
- Good-better-best proposals, contracts, payments and homeowner financing in one tool
- Half Snap reports arrive in about 4 hours, with 30-minute rush available
Watch out for
- Subscription is priced per user, so a crew of five pays five times the single-user rate
- Smaller imagery operation than EagleView, with hit-and-miss rural coverage
- No full CRM, so larger shops still need a second system
HOVER
Best for: Exterior contractors who want a measured 3D model of a whole house from smartphone photos, no drone required
HOVER is the only tool here that measures a roof from photos taken on a phone. Walk the property snapping pictures, and HOVER builds a measured 3D model of the whole exterior — roof, siding, windows and doors — with no drone or ladder. Roof-only scans cost $29, $49 or $69 by complexity on the free Starter plan, and the first three projects are free.
Pro costs $999 a year and takes $20 off every project, so a simple roof scan drops to $9; Business at $2,999 a year charges flat per-scan rates. Every project is still billed per scan, even on Pro, and photographing a property takes 15 to 30 minutes of careful work. Buy HOVER when you sell exterior remodels and the 3D visualization closes the deal; buy an aerial report when you only need roof numbers.
What we like
- Builds an accurate 3D model from smartphone photos, no drone or pilot certificate needed
- Covers roof, siding, windows and doors in one measured model
- 3D visualizations help sell jobs by showing homeowners the finished look
- Around 40 integrations, including AccuLynx, CompanyCam and Xactimate
Watch out for
- Every project is billed per scan even on the $999/year Pro plan
- Photographing a whole property takes 15 to 30 minutes of careful work on site
- Large commercial properties strain the phone-capture workflow
iRoofing
Best for: High-volume roofers who measure a dozen or more roofs a month and want a flat rate instead of per-report fees
iRoofing flips the pricing model: instead of paying per report, you pay a flat subscription and measure as many roofs as you like. The monthly plan costs $149 a month for three users, with $124 a month on a six-month term and $107 on a 24-month term, and every plan includes unlimited do-it-yourself measurements from satellite, blueprint or drone imagery, plus $75 of HD imagery credit a month.
The same subscription adds a shingle visualizer that shows homeowners their own house in new roofing, an instant estimator and a proposal generator, so the measurement becomes a sales presentation. Standalone perimeter reports cost $10 with no subscription. The HD imagery is metered, so heavy users watch the credit balance. Buy iRoofing when you measure more than a dozen roofs a month; buy a per-report tool when you measure only a few.
What we like
- Unlimited do-it-yourself measurements for one flat monthly price, no per-report meter
- AI roof visualizer shows homeowners their own house in new shingles
- Three user licenses included on every plan, with extra users at $39 a month
- Standalone perimeter reports cost $10 with no subscription required
Watch out for
- HD imagery is metered at 150 credits a month, so heavy users watch the balance
- No per-report option on subscription plans; light users pay the same flat rate
- Smaller brand than EagleView, so insurers may ask for a second measurement on claims
GAF QuickMeasure
Best for: GAF contractors who need one fast, cheap aerial report for a single-family bid
GAF QuickMeasure is the fastest cheap report in this list. Single-family reports cost $18 for GAF Master Elite contractors and $20 for everyone else, with no subscription and no GAF certification required to order. Most single-family reports arrive in under an hour, and every report includes a bill of materials and an editable 3D rendering that can be ordered through ABC Supply.
GAF warrants the measurements at about 95% accuracy and replaces a report free within 30 days if it falls short, which is below the detail of a premium EagleView report. Multi-family reports cost $54 to $60 per building, and there is no Xactimate export, so insurance work needs manual entry. Buy QuickMeasure when you need one fast, cheap report; buy EagleView when the claim needs a deeper report.
What we like
- Single-family reports from $18, with no subscription and no certification required
- Most single-family reports arrive in under an hour
- Every report includes a bill of materials and an editable 3D rendering
- GAF replaces a report free within 30 days if it falls below 95% accuracy
Watch out for
- No Xactimate export, so insurance work needs manual data entry
- Roof-only scope; no siding, gutters or full-exterior model
- 95% accuracy warranty is below the detail of a premium EagleView report
RoofScope
Best for: Contractors and adjusters who want CAD-reviewed aerial measurement reports with fast turnaround
RoofScope sells CAD-reviewed aerial measurement reports, with a person checking the drafting before delivery. Plans run $89 to $279 a month, and a standard residential report costs $39.95 pay-as-you-go. Reports cover roofs, gutters and siding, arrive within 12 hours on most plans, and include detailed line-item measurements for edges, hips, valleys and flashing.
The membership model takes some learning: the monthly fee acts as a prepaid deposit that goes toward report purchases, with unused funds rolling over. Xactimate export is available on the Growth plan at $199 a month and above, and the entry plan's 24-hour turnaround is slower than Roofr's two hours. Buy RoofScope when you want a human-reviewed report for a complex roof; buy Roofr when two-hour delivery matters more.
What we like
- CAD-reviewed reports with detailed line-item measurements for edges, hips and valleys
- Covers 99.9% of US addresses, plus blueprint-based reports for new construction
- ESX export for Xactimate on Growth plans and above
- Gutter and siding reports available alongside roof reports
Watch out for
- Pay-as-you-go reports cost $39.95 each, so volume buyers need a plan to save
- Entry plan turnaround is 24 hours, slower than Roofr at 2 hours
- Xactimate ordering needs the Growth plan at $199 a month or higher
AccuLynx
Best for: Established roofing companies doing insurance restoration who need CRM, estimating and production in one system
AccuLynx is the full roofing business system, not just a measuring tool. Pro and Elite cover leads and CRM, estimates and contracts, invoicing, scheduling, job costing and supplier ordering, and both plans order EagleView and RoofScope measurements inside the job file, so the measurement never leaves the workflow.
Pricing is by custom quote, per user license, after a demo — AccuLynx dropped its $250-a-month Essential plan in August 2026, so there is no published entry price to compare. Nine features, including texting, SmartDocs and subcontractor logins, are paid add-ons. Buy AccuLynx when an established company needs one system for the whole job; buy Roofr when a smaller crew wants published prices and a free start.
What we like
- The deepest roofing business system here: CRM, estimating, scheduling, invoicing and reporting
- Orders EagleView and RoofScope measurements inside the job file
- Direct supplier ordering through ABC Supply, SRS Distribution and QXO
- Elite adds supplement tracking, permits, production calendar and multi-location support
Watch out for
- Pro and Elite are quote-only, with no published price to compare against
- Third-party per-user estimates run $60-$120 a month, but AccuLynx has never confirmed them
- Nine features are paid add-ons, including texting, SmartDocs and subcontractor logins
DroneDeploy
Best for: Contractors and inspectors who already fly drones and want flight planning, cloud processing and 3D models in one platform
DroneDeploy is the choice when the roof must be flown, not just looked up. The Individual plan costs $4,188 a year, about $349 a month, for one pilot, with automated flight planning, cloud processing, orthomosaics and 3D models from up to 3,000 images per map. AI analysis flags issues in the captured imagery, and the platform works across construction and energy as well as roofing.
The entry price is steep for a roofer who only inspects roofs, and it covers one admin user only, so a team needs a quote-only plan. You also need the drone and a pilot, and the monthly billing rate is not published — annual billing is the printed price. Buy DroneDeploy when you already fly drones and want the mapping standard; buy an aerial report service when you never want to fly.
What we like
- Mature automated flight planning and cloud processing for maps, orthomosaics and 3D models
- Works across construction, energy and inspection, not just roofing
- Strong integrations, including Autodesk Construction Cloud and Skydio drones
- AI analysis flags issues in captured imagery
Watch out for
- Individual plan covers one admin user only, so a team needs a quote-only plan
- No roof measurements or insurance-ready reports out of the box
- $4,188 a year is a steep entry price for a roofer who only inspects roofs
Pix4D
Best for: Surveyors, engineers and forensic investigators who need survey-grade photogrammetry and defensible measurements
Pix4D is the survey-grade photogrammetry engine in this list, built for measurements that must survive an engineering review or a dispute. PIX4Dmatic Standard costs $3,990 a year, about $333 a month, and turns drone, mobile or LiDAR captures into orthomosaics, 3D models and point clouds with full control over every processing parameter.
Note the product change: PIX4Dmapper, the classic desktop tool, stops being sold on January 1, 2027, and Pix4D is steering buyers to PIX4Dmatic at the same $3,990-a-year Standard price. The learning curve is steep compared with one-click measurement tools, and the cloud product is a separate subscription. Buy Pix4D when accuracy and an audit trail matter most; buy RoofSnap or Roofr when a quick measurement is enough.
What we like
- The most accurate photogrammetry engine in this list, trusted by surveyors
- Desktop and cloud options, with outputs that plug into CAD and GIS workflows
- PIX4Dcatch turns a phone into a LiDAR-assisted capture device
- Accuracy and audit trail suit litigation, engineering analysis and insurance disputes
Watch out for
- Steep learning curve compared with one-click measurement tools
- PIX4Dmapper stops being sold on January 1, 2027, so buyers must learn PIX4Dmatic
- A roofer who wants a quick measurement will be faster with Roofr or EagleView
The best roof measuring software replaces the ladder and the tape with an aerial photo, a phone scan or a drone flight — and the right one depends on how many roofs you measure and what the number has to survive. Some tools sell a done-for-you report for $13 to $87 a roof, some charge a flat monthly rate for unlimited measuring, and a few bundle measuring into a full roofing business system. We ranked the ten tools below by fit for the most common buyer — a residential roofer who needs a fast, defensible number to quote from — and every price was checked on the vendor's own pricing page on November 8, 2026.
How to choose the best roof measuring software
- Match the pricing model to your volume. A roofer measuring three roofs a month spends less per report than on any subscription; a roofer measuring thirty spends less on a flat rate like iRoofing at $149 a month.
- Check the imagery before you buy. Aerial reports depend on existing photos, so a new build or a heavily treed lot may come back unmeasurable — ask each vendor about coverage for your service area first.
- Decide how much accuracy the job needs. A retail bid tolerates a 95% warranty; an insurance claim usually wants the deepest report, which is why EagleView Premium exists.
- Check the export. If your estimates live in Xactimate, the tool must produce an ESX file — Roofr, RoofScope and HOVER do, while GAF QuickMeasure does not.
- Count the users. Roofr includes unlimited users on every plan, while RoofSnap charges per user and DroneDeploy's entry plan covers one pilot, so the same crew can cost very different amounts.
Measuring is only half the sale — the number has to reach the homeowner as a quote they can sign. Our guide to estimating software for contractors covers the tools that turn measurements into signed contracts. And if the business also needs to show up when homeowners search for a roofer nearby, our local SEO service handles the visibility side, while the free local business schema generator builds the structured data that helps Google show your service area.
Whatever you shortlist, test it on roofs you already know. Order one report for a house you measured by hand, trace the same roof in a DIY tool, and compare the squares before you commit to a plan. That one test tells you more than any review can — including whether the imagery for your area is current and whether the report's line items match how your crews actually order materials.
Roof measuring software pricing: what you will actually pay
Take a residential roofer measuring 20 roofs a month. On list prices, the month costs $149 on iRoofing's flat plan, $260 on RoofSnap pay-as-you-go Half Snaps at $13 each, $305 on a RoofSnap subscription at $105 plus 20 Half Snaps at the $10 subscriber rate, $360 on EagleView Bid Perfect reports at $18 each, $360 on GAF QuickMeasure at $18 each for a Master Elite contractor, $369 on Roofr Measure+ at $109 plus 20 reports at $13, and $380 on Roofr Starter at 20 reports for $19 each.
Two numbers need adjusting before they are real. HOVER on Starter costs $580 for 20 simple roof scans at $29 each, but on Pro at $999 a year the same 20 scans cost $9 each, so the month runs about $263 including the membership — Pro pays for itself at roughly four projects a month. RoofScope pay-as-you-go costs about $799 for 20 standard reports at $39.95 each, and the $89 monthly membership acts as a deposit toward those reports rather than an extra fee on top.
Over a year, the flat plans are $1,068 on RoofScope's entry membership before report costs, $1,788 on iRoofing, $3,990 on PIX4Dmatic Standard and $4,188 on DroneDeploy Individual — but those last two buy a drone workflow, not just roof numbers, so compare them against the cost of flying, not against a $13 report. The same 20 roofs cost $149 a month at the cheap end and about $1,200 at the dear end on EagleView Premium reports at $60 each — a gap that comes entirely from the pricing model and the depth of the report, not from the roof.
Know the difference: a measurement report vs measuring software vs a roofing platform
The confusion in this category is between three different products that all call themselves roof measuring software. A measurement report is a done-for-you document: you send an address, someone else measures the roof, and a PDF comes back. EagleView, GAF QuickMeasure and RoofScope sell reports, and you pay per roof. Measuring software is a tool you operate yourself: you trace the roof on satellite imagery, walk the property with a phone, or fly a drone, and the software turns your capture into numbers. RoofSnap, iRoofing, HOVER, DroneDeploy and Pix4D work this way, and you pay a subscription, per project or per scan.
The third product is a roofing platform that includes measuring as one feature among many. Roofr and AccuLynx both order or produce measurements, but their real job is running the business — CRM, proposals, scheduling, invoicing and supplier ordering — and the measurement is a step inside that workflow rather than the product itself. If you only need a number for one bid, buy a report. If you measure every day, buy a tool. If the measurement keeps getting lost between the office and the crew, buy the platform.
There is a second, quieter confusion: accuracy claims are not comparable across vendors. EagleView cites independent testing, GAF warrants a percentage, and DIY tools depend on the person tracing — so a 98% claim and a 95% warranty are not the same kind of promise. The only fair test is your own: measure a roof you know, compare the squares, and see which tool's number your material supplier trusts.
Quick comparison: tool type by need
| Buyer | Best pick | Why |
|---|---|---|
| Most residential roofers | Roofr | Free to start, reports $13 each on paid plans, proposals built in |
| Insurance and commercial work | EagleView | The accuracy standard insurers trust, from $18 a report |
| DIY estimators on a budget | RoofSnap | Reports from $13, subscription $105 per user a month |
| Exterior remodelers who sell with 3D | HOVER | Phone photos become a measured 3D model, scans $29-$69 |
| High-volume measuring | iRoofing | Unlimited DIY measurements for a flat $149 a month |
| One fast, cheap report | GAF QuickMeasure | $18 a report, usually delivered in under an hour |
| Survey-grade accuracy | Pix4D | PIX4Dmatic photogrammetry from $333 a month |
Mistakes to avoid
- Budgeting on the per-report price alone. A $13 report is cheap once and expensive twenty times a month — multiply the report price by your real monthly volume before comparing it with a flat subscription.
- Buying a subscription before checking imagery coverage. Aerial tools cannot measure a roof they have no photo of, and new builds, rural properties and heavily treed lots are the usual gaps. Test your own service area first.
- Forgetting the per-user multiplier. RoofSnap charges per user and DroneDeploy's entry plan covers one pilot, so a five-person crew costs far more than the single-user headline price.
- Assuming every report drops into Xactimate. GAF QuickMeasure has no ESX export, and RoofScope needs the Growth plan for it — if claims work is the job, check the export before you buy.
- Paying for a drone workflow when you only need numbers. DroneDeploy and Pix4D are excellent tools, but they need a drone, a pilot and processing time; an aerial report service delivers the same squares without any of it.
How we chose
We verified every price against the vendor's own pricing page through fresh crawls dated November 6–8, 2026 — the direct page reader was down on November 8, so each figure was cross-checked against at least two independent reads of the vendor's page, and per-report and per-project prices are stated as such rather than converted into monthly equivalents. Ratings appear only where the G2 review page was crawled within the last few days; where the G2 page was stale, based on two or three reviews, mixed up with a different product, or missing entirely, we show no rating rather than a stale one. No vendor paid for a place in this list, and none of the links here are affiliate links.
What to do next
Start with the free plan or trial of your top pick and run it against a roof you already measured by hand. Check that the squares match, that the report arrives fast enough for your quoting rhythm, and that the numbers drop into your estimating workflow without retyping. If the measuring side is sorted but new customers are not finding you, our monthly SEO service handles the visibility side — or compare providers in our guide to SEO companies for small business. Once your tools are in place, find out what's holding your rankings back.
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Get a free audit→Sources we checked (16)
- Roofr pricing — roofr.com/pricing (checked November 8, 2026)
- EagleView pricing — eagleview.com/pricing (checked November 8, 2026)
- RoofSnap pricing — roofsnap.com/pricing (checked November 8, 2026)
- HOVER pricing — hover.to/pricing (checked November 8, 2026)
- iRoofing pricing — iroofing.org/pricing (checked November 8, 2026)
- GAF QuickMeasure — quickmeasure.gaf.com (checked November 8, 2026)
- RoofScope pricing and FAQ — roofscope.com (checked November 8, 2026)
- AccuLynx plan options — acculynx.com/plan-options (checked November 8, 2026)
- DroneDeploy pricing — dronedeploy.com/pricing (checked November 8, 2026)
- Pix4D pricing — pix4d.com/pricing (checked November 8, 2026)
- Roofr reviews — g2.com/products/roofr/reviews (checked November 8, 2026)
- EagleView reviews — g2.com/products/eagleview-eagleview/reviews (checked November 8, 2026)
- RoofSnap reviews — g2.com/products/roofsnap/reviews (checked November 8, 2026)
- iRoofing reviews — g2.com/products/iroofing/reviews (checked November 8, 2026)
- AccuLynx reviews — g2.com/products/acculynx/reviews (checked November 8, 2026)
- DroneDeploy reviews — g2.com/products/dronedeploy/reviews (checked November 8, 2026)
Frequently asked questions
What is the best roof measuring software?
Roofr is the best fit for most roofers: free to start, measurement reports from $13 on paid plans, and proposals built in. EagleView is the better pick when the report must stand up in an insurance claim, and RoofSnap is the better pick when you prefer to trace the roof yourself.
How much does roof measuring software cost?
Per-report tools run $13 to $87 a roof depending on depth: RoofSnap Half Snaps from $13, EagleView Bid Perfect at $18, GAF QuickMeasure at $18 to $20. Flat subscriptions run $89 to $349 a month, and HOVER charges $29 to $69 per project. A roofer measuring 20 roofs a month typically spends $149 to $400.
Is there free roof measuring software?
Two tools in this list start free. Roofr has a free Starter plan with unlimited users, though each measurement report costs $19. HOVER has a free Starter plan with the first three projects free, then charges per scan. No tool here offers unlimited free measurements.
Which is better for roof measuring, EagleView or Roofr?
EagleView wins on report depth and insurer acceptance, with Premium reports at $32.75 to $87 and independent testing at 98.77% accuracy on roof lines. Roofr wins on speed and workflow: reports in as little as two hours for $13, flowing straight into proposals. Use EagleView for claims and Roofr for fast retail bids.
Do I need a drone to measure a roof?
No. Seven of the ten tools here measure roofs without a drone: EagleView, Roofr, RoofSnap, GAF QuickMeasure and RoofScope use aerial or satellite imagery, HOVER uses phone photos, and iRoofing lets you trace satellite imagery yourself. A drone only matters with DroneDeploy or Pix4D, where you fly and process the capture yourself.
How accurate is aerial roof measurement?
It depends on the source. EagleView cites independent CompassData testing at 98.77% accuracy on roof lines, and GAF warrants QuickMeasure at about 95% with free replacement inside 30 days. DIY tracing and phone scans depend on the imagery and the person tracing, so verify the first few measurements against a tape.
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