# Open Authenticator by Skyost vs Alerta app

The clearest difference is device support: Open Authenticator by Skyost at 4 against Alerta app's 2. Open Authenticator by Skyost also leads on iOS requirement (15.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Open Authenticator by Skyost sells 2 in-app purchases, starting at $0.99 per month and Alerta app sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Open Authenticator by Skyost ships an update fortnightly, Alerta app every 10 days. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Open Authenticator by Skyost | Alerta app |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/open-authenticator-by-skyost/id6479272927/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 75 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Hugo Delaunay](https://appshunter.io/developer/1456648264) | [NOPOINT Limited](https://appshunter.io/developer/1848317932) |

## What reviewers say

### Open Authenticator by Skyost

[App page](https://appshunter.io/ios/app/open-authenticator-by-skyost/id6479272927)

This app generates Time-Based One-Time Passwords (TOTPs) to enhance online account security through two-factor authentication. It offers cross-platform syncing, a self-hostable backend, and an intuitive interface for managing your security codes.

**Highlights:** Generates Time-Based One-Time Passwords (TOTPs), Enhances online account security with 2FA, Cross-platform token syncing, Self-hostable backend option, Fast and easy-to-use interface, Open-source and free for local use

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Contributor Plan: Monthly | $0.99 | per month |
| Contributor Plan: Annual | $9.99 | per year |


### Alerta app

[App page](https://appshunter.io/ios/app/alerta-app/id6754450441)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $17.99 | per year |


## Frequently asked questions

### Is Open Authenticator by Skyost free?

Open Authenticator by Skyost is free to download, with in-app purchases available.

### Is Alerta app free?

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

### Do Open Authenticator by Skyost or Alerta app have ads?

Neither Open Authenticator by Skyost nor Alerta app shows ads.

### Which is updated more often, Open Authenticator by Skyost or Alerta app?

Open Authenticator by Skyost ships an update fortnightly, and Alerta app every 10 days. Most recently, Open Authenticator by Skyost was updated on October 14, 2026 and Alerta app on October 1, 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.*