RF 4DAT vs Wall Level

RF 4DAT helps you understand how much RF activity is around you using on-device Bluetooth scanning. See live device counts, review history by location, and keep it all in clear, simple screens. RF 4DAT is free to download, and scanning is free forever. Free features: - Live RF device counts with manual scan control - Location-tagged history (manual or auto-detected) - Protect: a curated guide to RF detection, measurement, and shielding gear - Legal and ethical use guidance built in RF 4DAT Pro (one-time in-app purchase): - Trends: averages, recent changes, most-scanned places, and common devices - CSV export of your scan history Bought RF 4DAT when it was a paid app? Pro is included automatically — there is nothing to buy again. Tap Restore Purchases in Settings if it doesn't appear. Privacy: the 4DAT method Your scans stay on your device. RF 4DAT does not collect, sell, or share your data, and there is no analytics or tracking. Location, when you allow it, is used on-device only to label a scan with a place name; coordinates are never stored. Please use RF 4DAT only where you have permission and legal authority. It is not for stalking, covert surveillance, or identifying people. Device counts are estimates of nearby signals, not identifications of individuals. As an Amazon Associate, RF 4DAT earns from qualifying purchases made through links in the Protect tab. Prices and availability are set by Amazon.

Hang posters straight without stepping back and squinting. Point the camera at a wall and a true horizontal line appears. It is not a decoration drawn on the screen — it is computed from the phone's gravity sensor, so it stays level no matter how you hold the phone. 【Poster preview frame】 Pick 30×40, 50×70, A4, B2 or your own dimensions, and place a life-size frame on the wall. The frame is anchored to the wall: walk closer, step back or look from the side and it stays put. You know how much space it takes before anything goes up. 【Several at once】 The hard part of a gallery wall is not hanging things, it is keeping them aligned and evenly spaced. Place more frames and dragging snaps them to the same height and to matching gaps, with guides showing why it moved. Deliberately staggered layouts are fine too — anything more than two centimetres off is left alone. 【Quiet】 No account, no ads, no tracking. It sends anonymous usage counts — which features get used — with nothing that identifies you, and the camera image never leaves your device. The level line is free forever. 【Languages】 English, 繁體中文, 简体中文, 日本語, 한국어