OTP Authenticator vs sMOTP
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
OTP Authenticator
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Swiss SafeLab OTP Authenticator is a free strong one-time password app fully compliant to the mOTP specification (http://motp.sourceforge.net/). mOTP is based on time synchronized one-time-passwords. Swiss SafeLab OTP Authenticator Features: - MUI Support (English, German, Swiss German, French, Italian, Spanish) - multiple accounts with individual mOTP Secret and bookmark - supports bookmarks - define mOTP Secret by - manual mOTP Secret input - shaking the device - random seed input - supports 4 digit PIN (as by specification) - supports alphanumeric PIN - permanently hide mOTP Secret after profile creation - displays current epoch time, local time and local time zone - copy-to-clipboard support - option to generate new mOTPs without the requirement of entering PIN again Swiss SafeLab OTP Authenticator is supported by our pure software-based two factor authentication solution Swiss SafeLab M.ID Suite (https://www.swiss-safelab.com/mid/).
sMOTP
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sMOTP is a simple strong authentication solution for iOS. The solution is based on time synchronous one time passwords. It consists of a client component and a server component(available on http://motp.sourceforge.net). Features: 1.Supports 4 digit PIN 2.Supports reload PIN by face id / touch id(if saved) 3.Support copy-to-clipboard 4.Secure your MOTP Secret and PIN by face id after saved. 5.Secure your PIN if app move to background (30s for timeout) 6.Support iPad and iPhone You can set pause or generates a one-time password every 10 seconds
Screenshots
Verdict
The clearest difference is ads: OTP Authenticator at none against sMOTP's shown. OTP Authenticator also leads on update cadence (every 5 months vs every 32 months) and iOS requirement (7.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OTP Authenticator ships an update every 5 months, sMOTP every 32 months. The most recent releases landed on September 20, 2026 and September 27, 2026 respectively.
| Parameter | OTP Authenticator | sMOTP |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months โ better | Every 32 months |
| Ads | No โ better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 16 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Swiss SafeLab GmbH | SHIH-CHEN FAN |
In-app purchases
OTP Authenticator
No in-app purchases
sMOTP
No in-app purchases









