# Authenticator App vs Ruler

The clearest difference is rating: Ruler at 5.0 against Authenticator App's 4.3. Ruler also leads on update cadence (every 2 days vs every 8 months). Authenticator App's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (214 vs 5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Authenticator App sells 10 in-app purchases, starting at $4.99 per 7 days and Ruler sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Ruler holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Authenticator App has 214 ratings behind it against 5, so its average is the more settled of the two.

Authenticator App ships an update every 8 months, Ruler every 2 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Authenticator App | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (214 ratings)](https://appshunter.io/ios/app/authenticator-app-2famfaotp/id6480137982/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314/reviews)** |
| Number of ratings | **214** | 5 |
| Positive reviews | 61.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 days** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 48 MB | 27 MB |
| Requires iOS | 17 | **16.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Authentication Services](https://appshunter.io/developer/1880352966) | [Myroslav Drozd](https://appshunter.io/developer/1847677489) |

## What reviewers say

### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-2famfaotp/id6480137982)

This app generates secure two-factor authentication tokens to protect your online accounts. It offers encrypted cloud backups and multi-device synchronization for easy recovery and access. The app works offline and can be secured with a PIN or biometric lock.

**Highlights:** Secure 2FA token generation, Encrypted cloud backups, Multi-device synchronization, Offline functionality, PIN and biometric lock

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Digital Security Authenticator | $4.99 | per 7 days |
| Enhance online security | $5.99 | per 7 days |
| Smart Authenticator | $6.99 | per 7 days |
| Secure Code Generator | $7.99 | per 7 days |
| 2FA App | $14.99 | per month |
| Secure Verification Generator | $19.99 | per month |
| Account protection Authenticator | $29.99 | per month |
| Secure your accounts | $39.99 | per year |
| Safe Login Code Generator | $49.99 | per year |
| One-Time Password | $59.99 | per year |


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314)

Transform your phone into a precise measuring tool. Accurately measure objects, surfaces, and distances using your screen or camera. Ideal for home, work, or on-the-go tasks, providing quick and reliable measurements.

**Highlights:** Measure objects on screen, Switch between units (cm, mm, inches), Save and share measurements, Easy-to-use interface, Accurate and fast measurements

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Ruler | $2.99 | per 7 days |
| Smart Ruler | $4.99 | per 7 days |
| Smart Ruler | $6.99 | per 7 days |
| Smart Ruler | $9.99 | per year |
| Smart Ruler | $14.99 | per year |
| Smart Ruler | $19.99 | per year |
| Smart Ruler | $24.99 | per year |


## Frequently asked questions

### Is Authenticator App free?

Authenticator App is free to download, with in-app purchases available.

### Is Ruler free?

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

### Which has better reviews, Authenticator App or Ruler?

Ruler is rated higher. Authenticator App averages 4.3 out of 5 from 214 ratings, while Ruler averages 5.0 from 5 ratings.

### Do Authenticator App or Ruler have ads?

Neither Authenticator App nor Ruler shows ads.

### Which is updated more often, Authenticator App or Ruler?

Authenticator App ships an update every 8 months, and Ruler every 2 days. Most recently, Authenticator App was updated on November 4, 2026 and Ruler on October 30, 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.*