# Ring Sizer vs True Authenticator TOTP 2FA

The clearest difference is ads: Ring Sizer at none against True Authenticator TOTP 2FA's shown. Ring Sizer also leads on device support (3 vs 1). True Authenticator TOTP 2FA's advantage is update cadence (weekly vs every 8 months). On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $2.99 per 7 days and True Authenticator TOTP 2FA sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Ring Sizer ships an update every 8 months, True Authenticator TOTP 2FA weekly. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Ring Sizer | True Authenticator TOTP 2FA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/true-authenticator-totp-2fa/id6762838868/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 45 MB | 36 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrii Kulchytskyi](https://appshunter.io/developer/1759867572) | [Ta Duc Huy](https://appshunter.io/developer/1895036973) |

## What reviewers say

### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-size-measure-app/id6757514085)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer Weekly with 3 days trial | $2.99 | per 7 days |
| Ring Sizer Yearly | $14.99 | per year |


### True Authenticator TOTP 2FA

[App page](https://appshunter.io/ios/app/true-authenticator-totp-2fa/id6762838868)

This app provides secure two-factor authentication codes and enhances security with real-time scam detection for links and calls. It also offers encrypted sharing of codes for families or teams and secure iCloud backup to prevent account loss.

**Highlights:** On-device TOTP/HOTP code generation, Real-time fraudulent link/call detection, Encrypted 2FA code sharing, Encrypted iCloud sync and backup, Live Activity and Dynamic Island integration, Smart QR scanner for account setup, Face ID/Passcode app lock

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Yearly | $29.99 | per year |
| Premium Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Ring Sizer free?

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

### Is True Authenticator TOTP 2FA free?

True Authenticator TOTP 2FA is free to download, with in-app purchases available.

### Do Ring Sizer or True Authenticator TOTP 2FA have ads?

True Authenticator TOTP 2FA shows ads; Ring Sizer does not.

### Which is updated more often, Ring Sizer or True Authenticator TOTP 2FA?

Ring Sizer ships an update every 8 months, and True Authenticator TOTP 2FA weekly. Most recently, Ring Sizer was updated on October 24, 2026 and True Authenticator TOTP 2FA 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.*