Protractor Edge vs Watchio 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/
Watchio AI
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Camera HD 1080P Automatic night vision activation 270 Viewing Angle Digital Pan, Tilt and Zoom Monitor 4.3 inch touch screen Digital zoom 10 hours long battery life Audio Two-way talk Three comforting lullabies Sound level indicator 8-level volume adjustment Alert Voice activation (VOX) Room temperature display and alert Low battery alert Out of range warning APP HD 1080P video streaming Push notification Video recording Image snapshot
Screenshots
Verdict
The clearest difference is in-app purchases: Watchio AI at none against Protractor Edge's 2. Watchio AI also leads on ads (none vs shown) and update cadence (every 4 days vs every 6 weeks). On price, device support and iOS requirement 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. Watchio AI asks for nothing beyond the download.
Protractor Edge ships an update every 6 weeks, Watchio AI every 4 days. The most recent releases landed on September 20, 2026 and May 16, 2026 respectively.
| Parameter | Protractor Edge | Watchio AI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 weeks | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 17 MB | 33 MB |
| Age rating | +4 | 4+ |
| Developer | 向阳 杨 | TRANWO TECHNOLOGY CORP. |
In-app purchases
Protractor Edge
- Support for a cup of coffee$1.99
- Ads-free experience$1.99
Watchio AI
No in-app purchases
Questions
Is Protractor Edge free?
Is Watchio AI free?
Do Protractor Edge or Watchio AI have ads?
Which is updated more often, Protractor Edge or Watchio AI?
Other comparisons
