Scan4D vs Biquadia

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.

Biquadia is an acoustic engineering and audio analysis lab designed for audio engineers, researchers, and sound designers. It brings real-time DSP, acoustic measurement, spectral visualization, and spatial analysis directly to iOS and iPadOS. [IN-APP PURCHASE DISCLOSURE] Biquadia includes powerful core features completely free of charge. Advanced features marked below with [Requires In-App Purchase] require a Biquadia Pro subscription (Monthly with a 7-day free trial) or a Lifetime Purchase. FREE FEATURES INCLUDED: • DSP Lab: Real-time FIR/IIR filtering, parametric EQ, dynamics processing, live oscilloscope, and FFT spectrum analyzer. • Analysis Lab: High-resolution FFT, pitch tracking, formant estimation, and real-time STFT spectrogram. • Measurement Lab: Multi-sweep acoustic measurements, impulse response capture, and calibrated SPL analysis. • Psychoacoustics & Codec Lab: Codec difference spectrograms, perceptual masking thresholds, and Bark/Mel scale overlays. • Audio FX & Signal Generator: Sine, frequency sweeps, pink/white noise generator, plus chorus, drive, and delay visualization. • System & Audio Hub: System performance diagnostics, multi-channel I/O mixer, and live signal routing meters. PRO FEATURES [REQUIRES IN-APP PURCHASE]: • Target-Speaker Extraction [Requires In-App Purchase]: Experimental on-device Core ML model that isolates one enrolled voice from a mixture using its speaker embedding — a technology demonstration, not a general-purpose noise remover. • Advanced Array Processing [Requires In-App Purchase]: Covariance-based MVDR beamforming for multi-microphone arrays (up to 32 channels). • Ambisonics & Spatial Audio [Requires In-App Purchase]: First-Order Ambisonics (FOA) encoding, 3D scene rotation, and binaural room impulse response decoding. • Measurement Data Export [Requires In-App Purchase]: CSV export of per-band THD+N/SNR measurement data. IN-APP PURCHASE OPTIONS: - Biquadia Pro Monthly: $4.99/month (Auto-renewable subscription with a 7-day free trial). - Biquadia Pro Lifetime: $79.99 (One-time non-consumable purchase). Biquadia processes audio entirely on-device. It has no developer-operated backend, telemetry, or audio upload. Network activity is limited strictly to Apple StoreKit and user-selected external links. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/