ZenLevel vs FlatPad

ZenLevel turns your iPhone into a precision inclinometer with the calm, deliberate feel of a real machinist's instrument. Built for builders, DIYers, photographers, woodworkers, and anyone who needs something perfectly level, perfectly plumb, or at exactly the right slope. FOUR MEASUREMENT MODES SURFACE — Lay your iPhone flat on a countertop, shelf, or picture frame. The two-axis bubble instrument shows the exact inclination, with digits that roll smoothly between values like a laboratory dial. When you find true level, the interface shifts to a calm, luminous green. PLUMB — Press the back of your iPhone against a vertical surface to check whether it is truly vertical. A tall bubble tube rises and falls with the wall's deviation, and a "check position" warning tells you when the phone is too flat for an accurate reading. CALIBRATE — Every sensor drifts. Place your phone on a surface you trust, wait for the stability meter, and tap ZERO OUT. Offsets persist across launches, and Reset calibration restores factory defaults at any time. HISTORY — Save any measurement to a log grouped by day. Tap an entry to see its details, edit its note, or delete it. HOLD THE READING Measuring under a shelf or behind a cabinet? Tap HOLD to freeze the reading, then take your iPhone out and read it — or save it — at your leisure. Tap RELEASE to go live again. SLOPE UNITS Show every reading in degrees, percent grade, millimetres per metre, or inches per foot. Rise-over-run units make drains, ramps, patios, decks, and gutters easy: a quarter inch per foot is simply 0.25 in/ft. Saved measurements follow your chosen unit and keep the original angle alongside. LANDSCAPE PRECISION MODE Rotate your iPhone to landscape and SURFACE becomes a long horizontal bubble vial for checking frames, shelf edges, and countertops along their length. A tipping indicator helps you keep the phone upright to avoid projection errors. DESIGN THAT FEELS LIKE A REAL TOOL • Deep blacks, subtle glass panels, and a signature zen-green accent • Rolling digit transitions on every live readout • Haptic feedback on level, save, calibration, and tab changes • Rotation-lock detection that guides you when iOS is locked to portrait • Decorative animations pause when Reduce Motion is on PRIVACY FIRST, BY DESIGN • No accounts, no login, no cloud sync • No tracking, no analytics, no advertising • No network requests of any kind • Measurements and calibration stay on your device • No third-party SDKs WHO IT'S FOR • Carpenters and builders checking walls, cabinets, and frames • Plumbers and landscapers setting drain and patio falls • DIY homeowners hanging shelves, pictures, TVs, and mirrors • Photographers aligning tripods and subjects • Woodworkers checking joinery and surfaces ZenLevel isn't a novelty. It's a precision instrument that lives in your pocket, ready to settle "is this level?" in seconds.

No ads. No subscription. No gadget to buy. Set your phone in the rig, see which corner is low and how much to raise — then get on with your day. Most leveling apps bury the answer under a wall of decimals — or a banner ad. FlatPad shows a top-down footprint of your RV, pools shade toward the corner that's low, and saves strong color for one thing: the instant all four corners sit level. NO ADS. NO SUBSCRIPTION. NO HARDWARE. • No banner ads — not even in the free version • No subscription — leveling is infrequent, so you pay once or not at all • No $150 Bluetooth box to mount and pair — your phone already has the sensors • Runs entirely on-device — no account, no sign-in ONE CLEAR THING ON SCREEN • A top-down plan of your trailer — the bubble drifts to the high side, a raise badge points at the low corner • Not a single number to parse • Set the phone down either way; the rig image rotates to match • Turns green the moment you're level ACCURATE CALIBRATION — FREE Every phone rests a hair off-flat because of the camera bump. FlatPad's two-read flip method measures that lean and subtracts it, so your readings are true — not off by a degree. It's the accuracy feature rivals gate behind a paywall. Here it's free. • Two quick reads, spun 180° — takes about 20 seconds • Works on any flat surface; it needn't be level • Haptic confirmation when each read lands BLOCK-HEIGHT MATH See exactly how much to raise each corner, in inches or centimeters. Heights are worked out from your rig's footprint, so calibration ends with a quick optional step to set it — and if you skip it, FlatPad tells you which default it's using instead of quietly guessing. A RIG FOR EACH RV Got more than one? Save a rig for each — its leveling method, its size, and a name you'll recognize — then pick the one you're parked in from the Visual or Audio tab. No re-entering dimensions every time you swap vehicles. • Each rig remembers its own leveling method and footprint • Switch in one tap, right where you're leveling • Name them anything — "Airstream", "the toy hauler", "Dad's fifth wheel" • One rig is free; keeping a library of them is Pro EVERYTHING YOU NEED TO LEVEL IS FREE Visual leveling, flip-method calibration, and block-height math never cost a thing — and never show an ad. FLATPAD PRO — $9.99 ONCE, NOT A SUBSCRIPTION Pro matches gear that costs $150 in hardware. One lifetime unlock, shared across all your devices: • Voice guidance — FlatPad speaks each move ("raise rear left, about an inch and a half") and waits until the rig settles before it talks again. Level from the jack stands without ever looking at the screen. • Apple Watch companion — set the phone in the rig and walk to the jack; your wrist shows the corner to raise and how much, turning green the instant you're level. No extra hardware to buy. • More leveling modes — level-by-side for paired jacks, and a stabilizer-only mode that squares you side-to-side first, then the front jack (independent-corner leveling is free) • A rig for every RV — save each vehicle's leveling method and size, and switch between them as you park (one rig is free) • Manual dark & light theme override Park it. Glance. Level.