# TrustOTP vs Idum Authenticator

The clearest difference is ads: Idum Authenticator at none against TrustOTP's shown. Idum Authenticator also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (18.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. TrustOTP sells 2 in-app purchases, starting at $2.99 per month and Idum Authenticator sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

TrustOTP ships an update every 3 weeks, Idum Authenticator every 2 days. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | TrustOTP | Idum Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 13 MB | 9 MB |
| Requires iOS | 26.2 | **18.0** |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Jean Delio Candio](https://appshunter.io/developer/1688875479) | [IDUM](https://appshunter.io/developer/6776361265) |

## What reviewers say

### TrustOTP

[App page](https://appshunter.io/ios/app/trustotp-2fa-authenticator/id6758748275)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $2.99 | per month |
| All Access | $19.99 | per year |


### Idum Authenticator

[App page](https://appshunter.io/ios/app/idum-authenticator/id6801459486)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Idum Authenticator Pro Weekly | $3.99 | per 7 days |
| Idum Authenticator Pro Yearly | $29.99 | per year |
| Idum Authenticator Lifetime | $69.00 | one-time |


## Frequently asked questions

### Is TrustOTP free?

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

### Is Idum Authenticator free?

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

### Do TrustOTP or Idum Authenticator have ads?

TrustOTP shows ads; Idum Authenticator does not.

### Which is updated more often, TrustOTP or Idum Authenticator?

TrustOTP ships an update every 3 weeks, and Idum Authenticator every 2 days. Most recently, TrustOTP was updated on October 2, 2026 and Idum Authenticator on September 30, 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.*