# Plumb: Bubble Spirit Level — Angle Finder, Slope & Surface > A digital spirit level and angle measurement tool with realistic physics. (iPhone/iPad app by National Tool Works LLC.) - Source: https://appshunter.io/ios/app/plumb-bubble-spirit-level/id6760734372 (this page in markdown: same URL + `.md`) - Developer: [National Tool Works LLC](https://appshunter.io/developer/1885230787) - Category: Utilities - Price: Free - Rating: 5.00/5 from 3 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 2 MB - Languages: American English - Released: 2026-03-26 - Data updated: 2026-08-23 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/plumb-bubble-spirit-level/id6760734372/reviews.md ## What is Plumb? Plumb is a precision bubble level that looks and feels like the real thing — machined bezel, genuine spring-damper physics, and a vial with real fluid optics. Check level, plumb, any angle, or a whole surface at once. No ads. No account. No tracking. The bubble moves with genuine spring-damper physics. The bezel looks like machined rubber. The vial renders with real fluid optics. When you hit level, the screen flashes, a tone fires, and the phone vibrates — all at once, so you can feel it without looking. LEVEL TAB The main vial reads roll in portrait or landscape. Lock orientation from the toolbar — portrait, landscape left, landscape right, or auto. Lock a reading to free up your hands. Calibrate to any known flat surface with one tap. SURFACE TAB A bullseye level checks both axes simultaneously. Perfect for countertops, appliances, equipment, and anything that needs to be flat in every direction at once. ANGLE TAB Dial in any target angle — 45°, 22.5°, a custom pitch, or a grade percentage — and get live feedback as you approach it. Great for trim work, ramps, crown molding, roofing, and drainage slopes. SIX DISPLAY MODES Choose how angles are shown — degrees, percentage, mm/m, pitch (X.X:12), or in/ft. Each tab has its own independent display mode. Tap any readout to cycle through options. WORKS EVERY WAY YOU HOLD IT Portrait, landscape left, landscape right, face-up, face-down — Plumb reads correctly in every orientation automatically. No mode to switch, no setup required. HOLD Freeze any reading with one tap, one volume button press, or the Action button. Press again to release. A haptic confirms when hold is activated or released. FEEDBACK THAT KEEPS UP WITH YOU Tone — pitch rises as you approach level, fires a clean confirm when you hit it Flash — the camera flash pulses on level, useful in dark spaces Haptic — a firm tap through the phone the moment you're on target NIGHT MODE A dedicated all-black theme with deep red vial and glow ring. Designed for attics, crawl spaces, and low-light conditions where a bright yellow screen is a liability. SIX THEMES Yellow, Red, Black, Sky Blue, Orange, and Night mode. CALIBRATION Per-orientation calibration profiles. Calibrate portrait, landscape left, landscape right, and flat independently. Reset any profile individually or all at once. NO ADS. NO TRACKING. Plumb does one thing and does it right. Nothing phones home. Nothing asks for your email. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://nationaltoolworks.com/apps/plumb/privacy ## Key features - Realistic bubble level physics - Surface bullseye level - Customizable angle measurement - Multiple display modes - Auto-orientation detection - Hold reading function - Visual, audio, and haptic feedback ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/plumb-bubble-spirit-level/id6760734372/reviews.md ### 5/5 — Great level app *2026-08-17* Much better than Apples default app! **Developer response:** Thanks so much! Glad it feels like the real thing — that was the goal. More precision tools on the way. ### 5/5 — Great. Exactly what I was looking for. *2026-08-16* Great app installed for my dad to level his washing machine. Thankyou. **Developer response:** Thanks so much! Glad it worked out for your Dad. ### 5/5 — A realistic and accurate iOS level *2026-03-27* Nice using a leveling app that works and mimics the real deal. ## Frequently asked questions about Plumb ### What is Plumb's primary function? Plumb is a digital spirit level designed to accurately measure angles and ensure surfaces are level. It simulates the feel of a physical bubble level with realistic physics and visual feedback. ### Does Plumb have ads? No, Plumb is completely ad-free. The developers have stated 'NO ADS. NO ACCOUNT. NO TRACKING.' to ensure a clean user experience. ### How accurate is Plumb? Plumb is designed for precision and features genuine spring-damper physics for its bubble movement. It also offers calibration features to ensure accuracy on any known flat surface. ### Can Plumb measure angles? Yes, Plumb has a dedicated Angle Tab that allows you to dial in target angles, including custom pitches and grade percentages, with live feedback as you approach your desired measurement. ### What display modes does Plumb offer for angles? Plumb offers six display modes for angles: degrees, percentage, mm/m, pitch (X.X:12), and in/ft. Each tab has its own independent display mode. ### How does Plumb provide feedback when a surface is level? When you hit level, Plumb provides simultaneous feedback through a screen flash, a confirmation tone, and phone vibration. This allows for easy detection even without looking at the screen. ### Is Plumb available on Android devices? Based on the provided data, Plumb is currently supported on iPhone devices. Information regarding Android availability is not specified. ### How often is Plumb updated? The latest version of Plumb is 1.0.1, which was last updated on April 1, 2026. This indicates recent development and ongoing support for the application. ## Version history (last 4 releases) ### 1.1.0 — 2026-08-22 • Introducing Plumb Pro: AR camera mode, colour themes + night mode, trade units (%, pitch, mm/m, in/ft), adjustable tolerance, and level alerts — free for 14 days, then $9.99/year • Early user? Everything stays free for you, forever — thanks for being here first • Settings redesigned ### 1.0.2 — 2026-08-01 • Now runs on iPhones with iOS 16 and later • More reliable review prompts • Small refinements and fixes ### 1.0.1 — 2026-04-01 - Settings now persist when closing and reopening the app - Volume buttons toggle Hold — press once to lock, press again to release - Toggle display modes on the Level tab (degrees, percentage, mm/m, pitch, in/ft) - Angle and Surface tabs have independent display modes - Level orientation lock added to main toolbar - Various display and settings improvements ### 1.0 — 2026-03-26 No release notes. ## More apps by National Tool Works LLC - [FlipScore – Card Scorekeeper](https://appshunter.io/ios/app/flipscore-card-scorekeeper/id6760599005) - [Logbook: Vehicle Mileage Log](https://appshunter.io/ios/app/logbook-vehicle-mileage-log/id6794934436) All apps by National Tool Works LLC: https://appshunter.io/developer/1885230787 ## Related topics [plum](https://appshunter.io/ios/topics/plum) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*