# Protractor Smart vs ライムメモ帳

The clearest difference is in-app purchases: ライムメモ帳 at none against Protractor Smart's 1. ライムメモ帳 also leads on update cadence (every 5 days vs every 21 months). Protractor Smart's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. Protractor Smart sells 1 one-off in-app purchase. ライムメモ帳 asks for nothing beyond the download.

Protractor Smart ships an update every 21 months, ライムメモ帳 every 5 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Protractor Smart | ライムメモ帳 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (246 ratings)](https://appshunter.io/ios/app/protractor-smart/id1076530001/reviews)** | — |
| Number of ratings | **246** | — |
| Positive reviews | 43.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 50 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ExaMobile S.A.](https://appshunter.io/developer/506014841) | [daichi kataoka](https://appshunter.io/developer/1526967122) |

## What reviewers say

### Protractor Smart

[App page](https://appshunter.io/ios/app/protractor-smart/id1076530001)

This app acts as a smart instrument for measuring angles using your device's camera. It offers two free modes for measuring angles on screen or using a plumb bob for slopes, with an additional premium mode for polygon measurements.

**Highlights:** Camera-based angle measurement, Touch measure mode, Plumb bob measure for slopes, Polygon measurement (premium), Screenshot functionality

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AdBlock - Remove ads | $1.99 | one-time |

**What reviewers like**

- 👍 Useful for measurements
- 👍 Accurate for its purpose
- 👍 Convenient and handy
- 👍 Good for specific tasks (e.g., knife sharpening, stereo mic angles)
- 👍 No excessive charges

**What reviewers complain about**

- 🐛 App freezes/loads indefinitely
- 🐛 Does not launch after updates
- 🐛 Stuck on loading screen
- 🐛 Inaccurate or unstable measurements
- 🐛 Camera quality issues

**Reported bugs**

- App loads indefinitely
- App does not launch after iOS updates
- Stuck on loading screen
- Photo upload not possible in premium version
- Upside-down protractor on iOS

**Requested features**

- Improve camera function (light, zoom)
- Add automatic hold function
- Increase digital readout size
- Add more skins/cosmetics
- Option to remove ads


### ライムメモ帳

[App page](https://appshunter.io/ios/app/id6806494392)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Protractor Smart free?

Protractor Smart is free to download, with in-app purchases available.

### Is ライムメモ帳 free?

ライムメモ帳 is free to download, with no in-app purchases.

### Do Protractor Smart or ライムメモ帳 have ads?

ライムメモ帳 shows ads; Protractor Smart does not.

### Which is updated more often, Protractor Smart or ライムメモ帳?

Protractor Smart ships an update every 21 months, and ライムメモ帳 every 5 days. Most recently, Protractor Smart was updated on October 24, 2026 and ライムメモ帳 on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*