# Blue2Factor vs Open Authenticator by Skyost

The clearest difference is rating: Blue2Factor at 5.0 against Open Authenticator by Skyost's 4.4. Blue2Factor also leads on in-app purchases (none vs 2). Open Authenticator by Skyost's advantage is update cadence (fortnightly vs every 2 months) and ratings volume (9 vs 1). On price, ads, device support and iOS requirement 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. Blue2Factor asks for nothing beyond the download.

Blue2Factor holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Open Authenticator by Skyost has 9 ratings behind it against 1, so its average is the more settled of the two.

Blue2Factor ships an update every 2 months, Open Authenticator by Skyost fortnightly. The most recent releases landed on October 1, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Blue2Factor | Open Authenticator by Skyost |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/blue2factor/id1601861068/reviews)** | [4.4 (9 ratings)](https://appshunter.io/ios/app/open-authenticator-by-skyost/id6479272927/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 56 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Christopher McLain](https://appshunter.io/developer/1107662428) | [Hugo Delaunay](https://appshunter.io/developer/1456648264) |

## What reviewers say

### Blue2Factor

[App page](https://appshunter.io/ios/app/blue2factor/id1601861068)

This app offers seamless and secure authentication using proximity, biometrics, and encryption. It integrates with SAML for single sign-on, creating a frictionless user experience.

**Highlights:** Invisible first and second factor authentication, Single sign-on via SAML, Proximity verification, Biometric authentication, Asymmetric encryption, Frictionless and secure environment

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Blue2Factor free?

Blue2Factor is free to download, with no in-app purchases.

### Is Open Authenticator by Skyost free?

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

### Which has better reviews, Blue2Factor or Open Authenticator by Skyost?

Blue2Factor is rated higher. Blue2Factor averages 5.0 out of 5 from 1 ratings, while Open Authenticator by Skyost averages 4.4 from 9 ratings.

### Do Blue2Factor or Open Authenticator by Skyost have ads?

Neither Blue2Factor nor Open Authenticator by Skyost shows ads.

### Which is updated more often, Blue2Factor or Open Authenticator by Skyost?

Blue2Factor ships an update every 2 months, and Open Authenticator by Skyost fortnightly. Most recently, Blue2Factor was updated on October 1, 2026 and Open Authenticator by Skyost on September 28, 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.*