# Authenticator App vs I.O.

The clearest difference is update cadence: I.O. at every 2 days against Authenticator App's every 9 days. Authenticator App's advantage is device support (5 vs 3) and iOS requirement (13.0 vs 15.1). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Authenticator App sells 11 in-app purchases, starting at $5.99 per 7 days and I.O. sells 1 in-app purchase, starting at $10.00 per month. Whichever you choose, the download price is not the number that matters.

Authenticator App ships an update every 9 days, I.O. every 2 days. The most recent releases landed on September 28, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Authenticator App | I.O. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (86 ratings)](https://appshunter.io/ios/app/authenticator-app-2fa-mfa/id6472872177/reviews)** | — |
| Number of ratings | **86** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 34 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Hearttell US Limited](https://appshunter.io/developer/508262068) | [IO.OI. Inc.](https://appshunter.io/developer/1891882426) |

## What reviewers say

### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-2fa-mfa/id6472872177)

Secure your online accounts with two-factor authentication. This app offers passwordless sign-ins, seamless autofill, and encrypted backups. It supports a vast range of services and works across Apple devices, with advanced security features like Face ID and Touch ID.

**Highlights:** Two-factor authentication (2FA), Multi-factor authentication (MFA), Passwordless sign-ins, Seamless password autofill, Encrypted iCloud backup, Offline OTP generation, Face ID & Touch ID security

**Features:** Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Authenticator App 2FA Weekly | $5.99 | per 7 days |
| Authenticator_App_2FA_MFA_Week | $6.99 | per 7 days |
| Authenticator App Monthly | $9.99 | per month |
| Authenticator App 2FA Monthly | $9.99 | per month |
| Authenticator App 2FA Monthly | $19.99 | per month |
| Authenticator_App_Yearly | $29.99 | per year |
| Authenticator App 2FA Yearly | $39.99 | per year |
| Authenticator App Yearly | $49.99 | per year |
| Authenticator_App_2FA_Yearly | $49.99 | per year |
| Authenticator App One-time | $49.99 | one-time |
| Authenticator_App_2FA_Onetime | $99.99 | one-time |


### I.O.

[App page](https://appshunter.io/ios/app/io/id6761871771)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IO Pro | $10.00 | per month |


## Frequently asked questions

### Is Authenticator App free?

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

### Is I.O. free?

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

### Do Authenticator App or I.O. have ads?

Neither Authenticator App nor I.O. shows ads.

### Which is updated more often, Authenticator App or I.O.?

Authenticator App ships an update every 9 days, and I.O. every 2 days. Most recently, Authenticator App was updated on September 28, 2026 and I.O. on September 19, 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.*