# OTP Auth vs Authenticator for Amazon

The clearest difference is rating: OTP Auth at 4.6 against Authenticator for Amazon's 1.0. OTP Auth also leads on ratings volume (463 vs 1) and iOS requirement (12.0 vs 15.5). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. OTP Auth sells 1 one-off in-app purchase and Authenticator for Amazon sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

OTP Auth holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: OTP Auth has 463 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on July 22, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | OTP Auth | Authenticator for Amazon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (463 ratings)](https://appshunter.io/ios/app/otp-auth/id659877384/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/authenticator-for-amazon/id6753742529/reviews) |
| Number of ratings | **463** | 1 |
| Positive reviews | 77.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 22 MB | 59 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Roland Moers](https://appshunter.io/developer/659877387) | [Grand Energy LLC](https://appshunter.io/developer/1844804348) |

## What reviewers say

### OTP Auth

[App page](https://appshunter.io/ios/app/otp-auth/id659877384)

Enhance your account security with two-factor authentication on your iPhone and iPad. This app supports numerous popular services and offers robust encryption for all your data. It works offline and prioritizes user privacy by not collecting or transmitting personal information.

**Highlights:** Two-factor authentication support, Encrypted iCloud Sync, Siri and Apple Watch support, Notification Center widget, Safari extension for password pasting, Face ID/Touch ID security, Encrypted backups and import/export

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OTP Auth Pro | $3.99 | one-time |

**What reviewers like**

- 🚀 Simple and effective
- 🔒 Secure with backup/restore
- 👍 Great Apple Watch support
- 👍 Intuitive and user-friendly
- 👍 Customizable icons and folders

**What reviewers complain about**

- 🐛 Occasional sync and widget issues
- 🐛 Apple Watch app needs improvements
- 🐛 Unreliable backup/restore for some users
- 🐛 Crashes and bugs reported by a few

**Reported bugs**

- Sync issues causing data loss
- Widget not displaying codes correctly
- Crashes on certain iOS versions

**Requested features**

- Larger text/font size options
- Alphabetical sorting of accounts
- Automatic account refresh/update
- Ability to edit account details


### Authenticator for Amazon

[App page](https://appshunter.io/ios/app/authenticator-for-amazon/id6753742529)

Secure your online accounts with reliable two-factor authentication. This app generates time-based verification codes for safer sign-ins and stronger account protection across various platforms. Setup is quick via QR code scanning or manual entry, with encrypted local storage for privacy.

**Highlights:** Two-factor authentication (2FA), Time-based verification codes, QR code scanner, Encrypted local storage, Backup and recovery, User-friendly interface

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Weekly-Trial | $4.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $39.99 | per year |
| Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is OTP Auth free?

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

### Is Authenticator for Amazon free?

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

### Which has better reviews, OTP Auth or Authenticator for Amazon?

OTP Auth is rated higher. OTP Auth averages 4.6 out of 5 from 463 ratings, while Authenticator for Amazon averages 1.0 from 1 ratings.

### Do OTP Auth or Authenticator for Amazon have ads?

Neither OTP Auth nor Authenticator for Amazon shows ads.

### Which is updated more often, OTP Auth or Authenticator for Amazon?

OTP Auth ships an update every 2 weeks, and Authenticator for Amazon every 2 weeks. Most recently, OTP Auth was updated on July 22, 2026 and Authenticator for Amazon on September 15, 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.*