# Alt vs Sirius Navigator

The clearest difference is review sentiment: Sirius Navigator at 100% against Alt's 76%. Sirius Navigator also leads on rating (4.8 vs 4.5) and update cadence (every 6 months vs every 15 months). On price, ratings volume, 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.

Sirius Navigator holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 8 and 9 respectively. Written reviews point the same way: 76% of Alt's written reviews are positive against 100% of Sirius Navigator's.

Alt ships an update every 15 months, Sirius Navigator every 6 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Alt | Sirius Navigator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/alt-o-meter/id1073846820/reviews) | **[4.8 (9 ratings)](https://appshunter.io/ios/app/sirius-navigator/id1278713154/reviews)** |
| Number of ratings | 8 | **9** |
| Positive reviews | 76.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 6 months** |
| Monetization | Free | Free |
| Size | 3 MB | 60 MB |
| Requires iOS | 17.0 | **11.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Hinman](https://appshunter.io/developer/1073846819) | [Oleg Baev](https://appshunter.io/developer/1274062833) |

## What reviewers say

### Alt

[App page](https://appshunter.io/ios/app/alt-o-meter/id1073846820)

This app calculates your precise altitude above sea level using your device's barometer or GPS. It offers a realistic, retro design and automatically calibrates for local atmospheric pressure, with optional manual calibration for advanced users.

**Highlights:** Barometer-based altitude calculation, GPS fallback for devices without barometer, Automatic local pressure calibration, Optional user calibration, Retro-style interface, Precise height above sea level

**In-app purchases:** none


### Sirius Navigator

[App page](https://appshunter.io/ios/app/sirius-navigator/id1278713154)

This app provides navigational tools including a compass, barometer, and altitude readings. It also offers easy access to your phone's light control for added convenience.

**Highlights:** Magnetic and True North compass, Location data, Altitude measurement, Barometer readings, Phone light control

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Alt free?

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

### Is Sirius Navigator free?

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

### Which has better reviews, Alt or Sirius Navigator?

Sirius Navigator is rated higher. Alt averages 4.5 out of 5 from 8 ratings, while Sirius Navigator averages 4.8 from 9 ratings.

### Do Alt or Sirius Navigator have ads?

Neither Alt nor Sirius Navigator shows ads.

### Which is updated more often, Alt or Sirius Navigator?

Alt ships an update every 15 months, and Sirius Navigator every 6 months. Most recently, Alt was updated on November 6, 2026 and Sirius Navigator on November 6, 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.*