# MERLIN vs Universal Speedometer

The clearest difference is update cadence: MERLIN at every 4 weeks against Universal Speedometer's every 5 months. MERLIN also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MERLIN ships an update every 4 weeks, Universal Speedometer every 5 months. The most recent releases landed on January 30, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | MERLIN | Universal Speedometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/universal-speedometer/id6752898152/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 5 months |
| Monetization | — | Free |
| Size | 48 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Merlin Cloud Security Corp.](https://appshunter.io/developer/1684181391) | [Evgheni Mihailevschi](https://appshunter.io/developer/1748783258) |

## What reviewers say

### MERLIN

[App page](https://appshunter.io/ios/app/merlin/id6448253144)

**Features:** macOS Compatibility

**In-app purchases:** none


### Universal Speedometer

[App page](https://appshunter.io/ios/app/universal-speedometer/id6752898152)

Track your speed and direction with this versatile tool. It offers analog and digital speedometer views, a compass, and trip statistics. Set speed limits, measure acceleration, and use HUD mode for windshield projection. Supports MPH, KMH, and Knots.

**Highlights:** Analog and digital speedometer, Compass for direction, Speed limit alerts, Acceleration measurement, HUD mode for windshield, Multiple unit support (MPH, KMH, Knots)

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

**In-app purchases:** none


## Frequently asked questions

### Is MERLIN free?

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

### Is Universal Speedometer free?

Universal Speedometer is free to download, with no in-app purchases.

### Do MERLIN or Universal Speedometer have ads?

Neither MERLIN nor Universal Speedometer shows ads.

### Which is updated more often, MERLIN or Universal Speedometer?

MERLIN ships an update every 4 weeks, and Universal Speedometer every 5 months. Most recently, MERLIN was updated on January 30, 2026 and Universal Speedometer on September 3, 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.*