Protractor Edge vs Bubble Level AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Protractor Edge
This utility app functions as a precise digital protractor for measuring angles on your device. It offers a smart instrument for accurate angle measurement, supporting iPhone and iPad. The app is free to download and use.
- Precise angle measurement
- Smart instrument
- Digital protractor
- Supports iPhone and iPad
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Protractor - smart instrument to measure angles. Support: https://k1er.github.io/
Bubble Level AI
This app transforms your device into a high-precision measurement tool for levels, surfaces, and angles. It offers real-time sensor data, voice guidance for hands-free operation, and camera integration for easy setup. Advanced features and unlimited history are available via an in-app purchase.
- Multi-mode measurements (Level, Surface, Angle)
- Live motion sensor data
- Voice guidance for hands-free use
- Camera integration for measurement grids
- Orientation lock and calibration
- Data export (text, CSV)
- Offline functionality
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TrueLevel turns your iPhone into a pocket‑size, high‑precision measurement suite built for engineers, architects, outdoor enthusiasts, and anyone who needs accurate level data on the go. Core Features • Multi‑Mode Measurements – Instantly capture Level, Surface, Angle, and Three‑in‑One readings. • Live Motion Sensors – Real‑time sensor fusion delivers sub‑millimeter stability, even when you’re on the move. • Voice Guidance – Hands‑free operation with clear, customizable voice prompts; perfect for hazardous or hard‑to‑reach environments. • Premium Pro View – Unlock advanced analytics, unlimited history, and export options with a single in‑app purchase. • Camera Integration – Snap a photo of your setup; the app automatically aligns your measurement grid. • Orientation Lock & Calibration – Pin orientation, set a custom zero point, and store calibrated presets for repeatable measurements. • Dark / Light Mode – Seamless UI that adapts to your environment for optimal readability. • Sharing Made Easy – Export results as text, CSV, or share a ready‑to‑send summary directly from the app. Why TrueLevel? - Professional‑grade accuracy without expensive hardware. - Intuitive UI built in SwiftUI for smooth, buttery interactions. - Fully offline – No internet needed once installed. - Privacy‑first – All data stays on‑device unless you choose to share. Perfect For • Surveyors & construction crews • Architects & interior designers • Outdoor adventurers & climbers • DIY hobbyists • Students learning physics or engineering Technical Highlights • SwiftUI + Combine – Modern, reactive UI that feels alive. • Core Motion – High‑frequency sensor polling for crisp data. • StoreKit 2 – Seamless, Apple‑approved in‑app purchases. • Accessibility – VoiceOver, Dynamic Type, and high‑contrast support. Ready to level up? Download TrueLevel today and turn every surface into a precise datum. EULA / Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Bubble Level AI at 5.0 against Protractor Edge's 4.0. Bubble Level AI also leads on ads (none vs shown) and review sentiment (100% vs 67%). Protractor Edge's advantage is iOS requirement (13.0 vs 18.0). On price, ratings volume, update cadence and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Protractor Edge sells 2 one-off in-app purchases and Bubble Level AI sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Bubble Level AI holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 67% of Protractor Edge's written reviews are positive against 100% of Bubble Level AI's.
Protractor Edge ships an update every 6 weeks, Bubble Level AI every 2 months. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.
| Parameter | Protractor Edge | Bubble Level AI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 17 MB | 6 MB |
| Age rating | +4 | 4+ |
| Developer | 向阳 杨 | Kirby Salter |
Customer experience
Protractor Edge
Bubble Level AI
In-app purchases
Protractor Edge
- Support for a cup of coffee$1.99
- Ads-free experience$1.99
Bubble Level AI
- Monthly Premium7 Days trial$0.991 Month
- Lifetime Premium Access$4.99
Questions
Is Protractor Edge free?
Is Bubble Level AI free?
Which has better reviews, Protractor Edge or Bubble Level AI?
Do Protractor Edge or Bubble Level AI have ads?
Which is updated more often, Protractor Edge or Bubble Level AI?
Other comparisons
