3D scanning comparison · August 2026
OpenSurvey3D vs PIX4Dcatch
PIX4Dcatch is the established mobile photogrammetry benchmark. OpenSurvey3D takes a different route: keep three kinds of 3D capture inside an open survey project, then use those same project coordinates to find assets again in AR.
The short answer
Choose by the deliverable—not the feature count.
- You want LiDAR mesh, point cloud, and photo capture in one iOS project.
- AR means returning to surveyed assets, not only viewing a design.
- Emlid or generic NMEA hardware, offline work, and open CAD/GIS files matter.
- You want MIT source and no required account or proprietary processing cloud.
- Detailed photogrammetric reconstruction is the primary outcome.
- You already use PIX4Dmatic, PIX4Dmapper, or PIX4Dcloud.
- You need Android or one of Pix4D's broader verified RTK integrations.
- Commercial support, cloud measurement, and sharing outweigh open-source control.
Feature by feature
The practical differences
Capabilities reflect first-party documentation and the current OpenSurvey3D build. Product tiers and integrations can change.
| Capability | OpenSurvey3D | PIX4Dcatch |
|---|---|---|
| Platform | iPhone and iPad | iOS and Android |
| 3D capture | LiDAR mesh, LiDAR point cloud, and guided photogrammetry | Smartphone photogrammetry plus supported LiDAR/depth |
| RTK input | Emlid Reach over Bluetooth; generic NMEA over Wi-Fi; built-in NTRIP | Verified integrations across Emlid, Topcon, Bad Elf, Trimble, Leica, and viDoc hardware |
| Processing model | Local-first project and on-device capture/viewing | Capture app feeding PIX4Dcloud or PIX4Dmatic/mapper for reconstruction |
| AR emphasis | Return to stored project assets with camera-view pins, direction, bearing, and distance | GCP detection, AR points, and captured/design project overlays |
| Survey workflow | Points, lines, areas, stakeout, feature codes, calibration, check shots, QA reports | Marks, GCPs, RTK point measurement, site localization, capture and reconstruction tools |
| Data delivery | CSV, GeoJSON, DXF, LandXML, project ZIP, source captures | Images, point clouds, GCPs, marks, localization, and downstream Pix4D deliverables |
| Data model | Local-first; no account required for field capture | Free Discovery capture tier; advanced export, RTK, processing, and AR depend on qualifying licenses/services |
| Source license | MIT-licensed native app | Proprietary |
The OpenSurvey3D distinction
The scan is one part of the field record.
A capture is attached to a surveyed observation before the camera starts. The anchor, coordinate frame, accuracy metadata, source media, feature attributes, check shots, and downstream exports stay connected. The project can later place those stored assets back into the camera view.
Photogrammetry
PIX4Dcatch has the mature reconstruction advantage.
Pix4D documents smartphone imagery and LiDAR capture, live coverage feedback, pausing and resuming, then processing through PIX4Dcloud or export to its desktop applications. If the finished dense model is the center of the workflow, that ecosystem is substantial.
AR asset finding
OpenSurvey3D turns the project back into field guidance.
Select a stored feature or view nearby project assets as camera pins. Direction, bearing, and distance update as you walk; re-anchoring refreshes the local alignment. This is a find workflow, not a claim that phone AR replaces numeric stakeout.
Both products can use RTK. Neither should be evaluated from the GNSS fix label alone. Calibration, camera pose, LiDAR/depth noise, photogrammetric geometry, tracking drift, and independent check residuals still matter.
Common questions
OpenSurvey3D and PIX4Dcatch FAQ
Is OpenSurvey3D a replacement for PIX4Dcatch?
It overlaps in mobile 3D capture and RTK-aware fieldwork, but the products emphasize different outcomes. PIX4Dcatch has a mature photogrammetry and cloud/desktop processing ecosystem. OpenSurvey3D emphasizes an open, local-first survey record, multiple on-device capture modes, AR asset finding, and auditable QA.
Which app is better for photogrammetry?
PIX4Dcatch is the stronger established choice when high-detail photogrammetric reconstruction and the wider Pix4D processing ecosystem are the priority. OpenSurvey3D is attractive when the photo scan must stay attached to an open survey project without a required proprietary cloud.
Do both apps support AR?
Yes, but AR is not one feature. PIX4Dcatch documents GCP detection, AR points, and project or design overlays. OpenSurvey3D focuses on finding previously surveyed assets through camera-view pins with live direction and distance.
Does an RTK fix make either phone scan centimeter accurate?
Not by itself. Receiver position, antenna-to-camera calibration, phone tracking, LiDAR noise, image geometry, control, and check-point residuals all contribute to finished-model accuracy.
Sources and disclosure
Check the primary documentation.
This comparison is published by OpenSurvey3D. It is based on publicly documented features, not a claim of independent head-to-head accuracy testing.
OpenSurvey3D
Try the open, local-first 3D field workflow.
Free on iPhone and iPad. No account required. MIT licensed.