RTAB-Map - 3D LiDAR Scanner vs PIX4Dcatch: 3D scanner Usage & Stats
RTAB-Map (Real-Time Appearance-Based Mapping) is an Open Source LiDAR / RGB-D / Stereo Graph-Based SLAM (Simultaneous Localization and Mapping) approach based on an online incremental appearance-based loop closure detector. The loop closure detector uses a bag-of-words approach to determinate how likely a new image comes from a previous location or a new location. When a loop closure hypothesis is accepted, a new constraint is added to the map's graph, then a graph optimizer minimizes the errors in the map in real-time. An optional memory management approach can be used to limit the number of locations used for loop closure detection and graph optimization, so that real-time constraints on large-scale environnements are always respected. ARKit's visual inertial odometry (VIO) is used as the SLAM front-end for RTAB-Map (the SLAM back-end).
* Note that unlike other scanning apps that optimize the map only after mapping, with RTAB-Map you get loop closure detection and map optimization online so you can have a live feedback to know when you have enough constraints in the map for good global optimization before stopping the scan.
*** 3D reconstruction available only with LiDAR sensor.
Features:
* Online 3D scanning/mapping of the environment.
* Online loop closure detection and map correction.
* Save in DB format (RTAB-Map desktop and rtabmap_ros format).
* Export in PLY, LAS or OBJ.
* Multi-session mapping (save and continue later).
* Use Apriltags to help finding loop closures in textureless environments.
* Mixed AR/VR First-Person in visualization mode.
* Raw ARKit data recording (up to 60 Hz!), useful to record long sessions without comprising battery life.
- Apple App Store
- Free
- Utilities
Store Rank
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DIGITIZE REALITY
Transform your mobile device into a powerful 3D scanner. Simply point and capture images and LiDAR data to create accurate 3D models ready for professional use.
Pair with a compatible RTK device for centimeter-level accuracy, precise measurements, and geolocation.
Visualize the captured model in the app, upload and export, and view it in AR.
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WORKFLOW
1 – Scan & Capture
Walk around your site. The app automatically gathers data and provides live feedback using iOS LiDAR, ensuring you capture every detail. For enhanced accuracy, use an RTK device compatible with PIX4Dcatch, Pix4D Autotags with a fully automated workflow, or combine both.
2 – Process, Analyze & Share
Process your data by uploading to PIX4Dcloud for online analysis and sharing, or export to PIX4Dmatic for desktop processing. Both platforms offer a 15-day free trial. Projects can also be exported to third-party photogrammetry software.
Measure spaces, document results, and enjoy all the benefits of a detailed 2D/3D model of your surroundings.
3 – View in AR
Experience an immersive augmented-reality view. Display 3D models and GCPs directly in your phone camera in AR.
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USE CASES
• Digitize construction sites
• Measure stockpiles and other objects
• Document underground utilities
• Digitize indoor and outdoor spaces with Autotags
• Visualize and verify 3D models in AR in real time
• Perform single-point measurements with RTK accuracy
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COMPATIBILITY
• Optimized for LiDAR-equipped devices
• All ARKit-enabled devices
• RTK devices: Emlid Reach RX, TopCon HiPer CR, Bad Elf Flex Mini, Bad Elf Flex, Trimble DA2, Leica Zeno FLX100 plus, viDoc
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TIPS & SAFETY
• Keep PIX4Dcatch up to date for optimal performance.
• Operate only in safe environments. Pix4D is not liable for damage, injuries, or legal issues resulting from misuse of the app.
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TERMS OF USE
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
- Apple App Store
- Free
- Utilities
Store Rank
- -
RTAB-Map - 3D LiDAR Scanner VS. 
PIX4Dcatch: 3D scannerJanuary 18, 2026