# OTP vs TOTP Calc

The clearest difference is price: OTP at Free against TOTP Calc's $0.29. OTP also leads on iOS requirement (9.3 vs 18.0). TOTP Calc's advantage is in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 6 months). On ads and device support there is nothing between them.

OTP is free to download; TOTP Calc costs $0.29 up front. OTP sells 1 one-off in-app purchase. TOTP Calc asks for nothing beyond the download.

OTP ships an update every 6 months, TOTP Calc every 5 weeks. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OTP | TOTP Calc |
| --- | --- | --- |
| Price | **Free** | $0.29 |
| Rating | **[3.4 (19 ratings)](https://appshunter.io/ios/app/otp-auth/id1436497541/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 28 MB | 8 MB |
| Requires iOS | **9.3** | 18.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [浩 王](https://appshunter.io/developer/1055265396) | [Shizuka TORITANI](https://appshunter.io/developer/967884555) |

## What reviewers say

### OTP

[App page](https://appshunter.io/ios/app/otp-auth/id1436497541)

This app generates secure one-time passwords for two-factor authentication on your device. It supports various protocols, allows easy account setup via QR codes or manual entry, and offers robust security features like biometric locks and encrypted backups.

**Highlights:** TOTP & HOTP code generation, QR code scanning for setup, Biometric app lock (Face ID/Touch ID), Encrypted data export/import, Account grouping and organization, Dark Mode support, iCloud sync and backup

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OTPAuth Premium | $1.99 | one-time |


### TOTP Calc

[App page](https://appshunter.io/ios/app/totp-calc/id6742089228)

**In-app purchases:** none


## Frequently asked questions

### Is OTP free?

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

### Is TOTP Calc free?

TOTP Calc costs $0.29, with no in-app purchases.

### Do OTP or TOTP Calc have ads?

Neither OTP nor TOTP Calc shows ads.

### Which is updated more often, OTP or TOTP Calc?

OTP ships an update every 6 months, and TOTP Calc every 5 weeks. Most recently, OTP was updated on October 29, 2026 and TOTP Calc on October 25, 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.*