LevelCheck is your acoustic advisor for iPhone — not just another decibel meter. Run 25 guided room and booth checks, get plain-English recommendations on what to fix, and verify improvements with Fix-Verify. Live metering, 7-band spectrum, and on-device history included. App Clip at levelcheck.live/clip offers a meter preview without a full install. Free essentials plus Core ($24.99/yr) and Pro ($39.99/yr) for guided workflows, export, LiDAR, and external mic support. Local-first — no account required. Not a certified SPL meter.