Scan4D vs SoundStems

Scan4D is a professional-grade reality capture app for iPhone and iPad. It turns your device's LiDAR sensor and camera into a powerful 3D scanner, capturing detailed meshes, depth maps, and camera poses for downstream reconstruction, photogrammetry, and spatial computing. FULL MODE (LiDAR devices) • Real-time mesh reconstruction with live wireframe overlay • 16-bit depth maps captured at adaptive frame rates • Scan capacity metrics: polygon count, drift tracking, session duration • Interactive 3D mesh preview with camera-sampled vertex coloring • Privacy filtering: person segmentation removes humans from meshes, face blurring in RGB exports LITE MODE (all devices) • RGB frame capture with ARKit camera poses • Server-side photogrammetry via exported image bundles • Automatic detection — no configuration needed TIME-SERIES SCANNING • Group scans by Location and re-scan the same space over time • "Extend Scan" loads a red ghost-mesh overlay of previous captures • Adjacent stitching: scan neighboring areas with shared coordinate frames • ARWorldMap relocalization for precise alignment between sessions FLEXIBLE EXPORT FORMATS • Scan4D: Full bundle with metadata, relocalization map, images, depth, and camera data • Polycam: Raw data import compatible with Polycam • RAW: Nerfstudio/COLMAP-compatible transforms.json + images + depth • OBJ / PLY / USDZ: Native mesh formats for MeshLab, Blender, and iOS Quick Look SERVER INTEGRATION • Configure any HTTP(S) upload endpoint in Settings • Direct PUT upload with live progress tracking • Save to Files or AirDrop for offline workflows • Compatible with self-hosted reconstruction pipelines DEVELOPER MODE • Front/back camera switching for testing privacy features • Synthetic IMU, camera, and depth injection for Simulator testing • Vertex mapping diagnostics and debug overlays Designed for researchers, 3D scanning professionals, and spatial computing developers who need raw, high-fidelity sensor data with full control over the reconstruction pipeline. Requires ARKit-capable device. LiDAR-equipped iPhone or iPad Pro recommended for full functionality.

SoundStems splits a song into its parts. Load a track and it separates into vocals, drums, bass and music, each one its own channel you can turn up, turn down, mute or solo. It all happens on your iPhone. The separation model runs on the device itself, so nothing is uploaded, there is no server, there is no account, and it works with no signal at all. WHAT YOU CAN DO WITH THE PARTS Mute the vocals and you have a backing track. Solo the drums and you have something to play along to. Push the bass up and the music down and you can hear what the low end is actually doing. Every part has its own fader. CHANGE THE KEY OR THE SPEED, NOT BOTH Shift the pitch in semitones with the clock untouched, or change the speed with the key untouched. They are separate controls because they are separate problems. PLACE EACH PART AROUND YOU Every stem has a 3D position. Move the vocal in front of you and the drums off to one side and listen to the song from inside it. FEATURES - Splits any song into vocals, drums, bass and music - The model runs entirely on your device, with no upload and no server - Fader, mute and solo on every part - Pitch shift with the speed held, and speed change with the key held - 3D placement of each part with spatial audio - Save any part as MP3, M4A, FLAC, ALAC, WAV, AIFF, Opus or CAF - Works completely offline - No ads, ever - No subscriptions, ever - No account, and no data collected SoundStems is free. There are no ads, there are no subscriptions, and there is nothing to unlock. It collects no data from you, because it has no networking in it at all. Built by Brandon Walker, doing business as Lee Wyatt Corp. Apps are published under Brandon's legal name while the Lee Wyatt Corp LLC completes formation. Every one of them is a genuine Lee Wyatt Corp product. Have an idea for an app or a game of your own? Lee Wyatt Corp builds them start to finish, and we would love to build yours. Bring it to leewyattcorp.com. Find all our apps and games at leewyattcorp.com.