# COSAction vs Proton Authenticator

The clearest difference is review sentiment: COSAction at 100% against Proton Authenticator's 56%. COSAction also leads on rating (4.9 vs 4.4) and iOS requirement (10.0 vs 17.0). Proton Authenticator's advantage is ratings volume (242 vs 10) and update cadence (weekly vs fortnightly). On price, ads, in-app purchases and monetization model there is nothing between them.

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

COSAction holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: Proton Authenticator has 242 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 100% of COSAction's written reviews are positive against 56% of Proton Authenticator's.

COSAction ships an update fortnightly, Proton Authenticator weekly. The most recent releases landed on June 1, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | COSAction | Proton Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (10 ratings)](https://appshunter.io/ios/app/cosaction/id1482603474/reviews)** | [4.4 (242 ratings)](https://appshunter.io/ios/app/proton-authenticator/id6741758667/reviews) |
| Number of ratings | 10 | **242** |
| Positive reviews | **100.0% of reviews** | 56.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free | Free |
| Size | 39 MB | 119 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Citizens for Self-Governance](https://appshunter.io/developer/1248810421) | [Proton AG](https://appshunter.io/developer/979659484) |

## What reviewers say

### COSAction

[App page](https://appshunter.io/ios/app/cosaction/id1482603474)

Empower grassroots activists with tools to connect with state legislators and build local support teams. Access news, track legislative actions, and utilize a phone outreach tool to advance constitutional amendments.

**Highlights:** Legislator contact tools, Volunteer team building, News articles, Action reports, Notifications, Phone outreach tool

**In-app purchases:** none


### Proton Authenticator

[App page](https://appshunter.io/ios/app/proton-authenticator/id6741758667)

Securely manage your two-factor authentication codes with an open-source, end-to-end encrypted authenticator app. It offers seamless cross-device syncing, effortless import from other apps, and robust backup options, all protected by strict Swiss privacy laws. Take control of your digital security with a trusted and private solution.

**Highlights:** End-to-end encrypted iCloud sync, Effortless import from other authenticators, Secure backup and export, Swiss privacy by design, Open source and transparent, Offline support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Cross-platform support
- 🔒 Secure cloud sync
- 👍 Easy import from other authenticators
- 🚀 Convenient 'next' feature for codes

**What reviewers complain about**

- 🐛 Buggy UI (scrolling jitters, random sorting)
- 👎 Lack of customization options (pin favorites, change icons)
- 🐛 Sync/login issues on iPad

**Reported bugs**

- Sync/login loop on iPad
- 2FA input broken on non-iPhone devices
- Screen strobing on iPad
- Duplicate entries after import

**Requested features**

- PIN unlock for desktop
- Alphabetical sorting option
- Export function (not just Proton-specific backup)
- Native macOS app
- Option to hide item icons


## Frequently asked questions

### Is COSAction free?

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

### Is Proton Authenticator free?

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

### Which has better reviews, COSAction or Proton Authenticator?

COSAction is rated higher. COSAction averages 4.9 out of 5 from 10 ratings, while Proton Authenticator averages 4.4 from 242 ratings.

### Do COSAction or Proton Authenticator have ads?

Neither COSAction nor Proton Authenticator shows ads.

### Which is updated more often, COSAction or Proton Authenticator?

COSAction ships an update fortnightly, and Proton Authenticator weekly. Most recently, COSAction was updated on June 1, 2026 and Proton Authenticator 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.*