# 2FA Authenticator Secure vs Duo Authenticator

The clearest difference is in-app purchases: 2FA Authenticator Secure at none against Duo Authenticator's 3. 2FA Authenticator Secure also leads on ads (none vs shown) and rating (4.4 vs 4.2). On price, update cadence and device support there is nothing between them.

Both are free to download. Duo Authenticator sells 3 in-app purchases, starting at $3.99 per 7 days. 2FA Authenticator Secure asks for nothing beyond the download.

2FA Authenticator Secure holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: 2FA Authenticator Secure has 172 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 65% of 2FA Authenticator Secure's written reviews are positive against 50% of Duo Authenticator's.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 2FA Authenticator Secure | Duo Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (172 ratings)](https://appshunter.io/ios/app/2fa-authenticator-secure/id1604264315/reviews)** | [4.2 (24 ratings)](https://appshunter.io/ios/app/duo-authenticator/id1665454984/reviews) |
| Number of ratings | **172** | 24 |
| Positive reviews | **65.4% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 38 MB | 60 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [25 Degrees Apps LLC](https://appshunter.io/developer/1574163403) | [Petr Polasek](https://appshunter.io/developer/1613323784) |

## What reviewers say

### 2FA Authenticator Secure

[App page](https://appshunter.io/ios/app/2fa-authenticator-secure/id1604264315)

Enhance your online security with this free and private two-factor authentication app. It adds an extra layer of protection to your accounts using unique time-based passwords and offers a secure vault for your files. Synchronization ensures your security is consistent across all your devices.

**Highlights:** Secure and private authentication, Synchronization across devices, Supports all online accounts, No passwords stored, Secure file vault

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🔒 Safe and secure
- 👍 Easy to navigate
- 🚀 Works well and fast
- 👍 Great service
- 👍 Keep safe

**What reviewers complain about**

- 🐛 Pin not masked
- 🐛 Complicated for new users
- 🐛 No help for 2-factor authentication
- 🐛 App is being monitored

**Reported bugs**

- Pin is not masked when typing

**Requested features**

- Appropriate step-by-step instructions for first-time users


### Duo Authenticator

[App page](https://appshunter.io/ios/app/duo-authenticator/id1665454984)

Enhance your online security with this multi-factor authentication app. It provides an extra layer of protection for your accounts by generating time-sensitive codes, even when offline. Secure your sensitive information with ease and peace of mind.

**Highlights:** Quick and easy setup, Wide service compatibility, Time-sensitive security codes, Offline code generation, End-to-end encryption, Security code protection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 Week | $3.99 | per 7 days |
| Premium 1 Month | $9.99 | per month |
| Premium 1 Year | $29.99 | per year |


## Frequently asked questions

### Is 2FA Authenticator Secure free?

2FA Authenticator Secure is free to download, with no in-app purchases.

### Is Duo Authenticator free?

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

### Which has better reviews, 2FA Authenticator Secure or Duo Authenticator?

2FA Authenticator Secure is rated higher. 2FA Authenticator Secure averages 4.4 out of 5 from 172 ratings, while Duo Authenticator averages 4.2 from 24 ratings.

### Do 2FA Authenticator Secure or Duo Authenticator have ads?

Duo Authenticator shows ads; 2FA Authenticator Secure does not.

### Which is updated more often, 2FA Authenticator Secure or Duo Authenticator?

2FA Authenticator Secure ships an update monthly, and Duo Authenticator monthly. Most recently, 2FA Authenticator Secure was updated on October 4, 2026 and Duo Authenticator on October 9, 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.*