Comparison

OTP Authenticator vs sMOTP

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

OTP Authenticator

Features
Read full description

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/).

About

sMOTP

Features
Read full description

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

OTP Authenticator4 screens
sMOTP4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard3 real differences ยท 3 level
OTP Authenticator versus sMOTP: the parameters behind the verdict, then further details
ParameterOTP AuthenticatorsMOTP
PriceFreeFree
Update frequencyEvery 5 months โ€” betterEvery 32 months
AdsNo โ€” betterYes
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS7.0 โ€” better15.0
Further details โ€” not scored
Size16 MB6 MB
Age rating4+4+
DeveloperSwiss SafeLab GmbHSHIH-CHEN FAN

In-app purchases

None

OTP Authenticator

No in-app purchases

None

sMOTP

No in-app purchases

Questions

Is OTP Authenticator free?
OTP Authenticator is free to download, with no in-app purchases.
Is sMOTP free?
sMOTP is free to download, with no in-app purchases.
Do OTP Authenticator or sMOTP have ads?
sMOTP shows ads; OTP Authenticator does not.
Which is updated more often, OTP Authenticator or sMOTP?
OTP Authenticator ships an update every 5 months, and sMOTP every 32 months. Most recently, OTP Authenticator was updated on September 20, 2026 and sMOTP on September 27, 2026.

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