# VisualRuler vs KeyIdentity Authenticator

The clearest difference is price: KeyIdentity Authenticator at Free against VisualRuler's $0.99. KeyIdentity Authenticator also leads on iOS requirement (9.0 vs 26.6). VisualRuler's advantage is update cadence (every 6 days vs every 8 months). On ads, in-app purchases and device support there is nothing between them.

KeyIdentity Authenticator is free to download; VisualRuler costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VisualRuler ships an update every 6 days, KeyIdentity Authenticator every 8 months. The most recent releases landed on October 21, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | VisualRuler | KeyIdentity Authenticator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 13.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 8 months |
| Monetization | Free | — |
| Size | 11 MB | 37 MB |
| Requires iOS | 26.6 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [altaibayar tseveenbayar](https://appshunter.io/developer/1116399254) | [KeyIdentity GmbH](https://appshunter.io/developer/571941070) |

## What reviewers say

### VisualRuler

[App page](https://appshunter.io/ios/app/visualruler-photo-ruler/id1116399255)

Transform any card in your wallet into a precision measuring tool using your iPhone camera. Simply place a card next to an object, and the app instantly calibrates to measure dimensions from a photo. It's a professional-grade measurement solution accessible to everyone.

**Highlights:** Measure from photos, Uses wallet card as reference, Instant auto-detection, Metric and imperial units, Photo library support, No special hardware needed

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

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative idea for measurement
- 👍 Easy to use (for some)
- ✅ Accurate measurements (for some)
- ✨ Useful for reference measurements

**What reviewers complain about**

- ❌ Inaccurate measurements
- ❌ Does not work at all
- ❌ Automatic card detection fails
- ❌ Manual adjustment is cumbersome
- ❌ Confusing to use

**Reported bugs**

- Automatic card detection does not work
- App does not detect the card
- App does not measure objects
- Measurements are always the same (8.6cm x 5.4cm)
- Camera orientation issues

**Requested features**

- Automatic object detection
- Automatic card detection improvement
- Manual adjustment improvement
- Add ruler and distance markings
- Support upright correction


### KeyIdentity Authenticator

[App page](https://appshunter.io/ios/app/keyidentity-authenticator/id1156019084)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VisualRuler free?

VisualRuler costs $0.99, with no in-app purchases.

### Is KeyIdentity Authenticator free?

KeyIdentity Authenticator is free to download, with no in-app purchases.

### Do VisualRuler or KeyIdentity Authenticator have ads?

Neither VisualRuler nor KeyIdentity Authenticator shows ads.

### Which is updated more often, VisualRuler or KeyIdentity Authenticator?

VisualRuler ships an update every 6 days, and KeyIdentity Authenticator every 8 months. Most recently, VisualRuler was updated on October 21, 2026 and KeyIdentity Authenticator on October 20, 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.*