imOTP vs Mobile OTP Authenticator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
imOTP
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imOTP is a free one-time password (OTP) client implementation. The OTP solution provides strong authentication based on time synchronous one-time passwords and consists of a client component (this application) and a server component (available on http://motp.sourceforge.net). imOTP features: -) Supports multiple accounts based on profiles -) Supports strict 4-digit pins a well as longer alphanumeric pins -) Supports taking the generated password into the clipboard -) Displays the current epoch time
Mobile OTP Authenticator
Securely manage your two-factor authentication codes. Easily add accounts by scanning QR codes or manual entry. Protect your online accounts with industry-standard HOTP and TOTP algorithms.
- QR code scanning for account setup
- Manual account entry
- Secure data storage in iOS Keychain
- Supports HOTP and TOTP algorithms
- Works with popular services like Google, Facebook, Amazon
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Scan the QR code issued by the two-factor authentication and automatically add the account you want to protect or select manual entry to manually set up the account. The account is stored in data security in the iOS key holder. The application supports all services that provide two-factor authentication using HOTP and TOTP algorithms. For example, Google, Facebook, Dropbox, Amazon, GitHub, Synology…. etc.
Screenshots
Verdict
The clearest difference is iOS requirement: imOTP at 9.0 against Mobile OTP Authenticator's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 8 months. The most recent releases landed on October 10, 2026 and October 17, 2026 respectively.
| Parameter | imOTP | Mobile OTP Authenticator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.5 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 8 months | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 20 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Johann Marinits | Albert Parti |
In-app purchases
imOTP
No in-app purchases
Mobile OTP Authenticator
No in-app purchases
Questions
Is imOTP free?
Is Mobile OTP Authenticator free?
Do imOTP or Mobile OTP Authenticator have ads?
Which is updated more often, imOTP or Mobile OTP Authenticator?
Other comparisons
