Comparison

OTP Auth vs One

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

Head to head
About

OTP Auth

Enhance your account security with two-factor authentication on your iPhone and iPad. This app supports numerous popular services and offers robust encryption for all your data. It works offline and prioritizes user privacy by not collecting or transmitting personal information.

Highlights
  • Two-factor authentication support
  • Encrypted iCloud Sync
  • Siri and Apple Watch support
  • Notification Center widget
  • Safari extension for password pasting
  • Face ID/Touch ID security
  • Encrypted backups and import/export
Read full description

OTP Auth adds support for two-factor authentication to your iPhone and iPad. It can be used with Dropbox, Facebook, GitHub, Google Mail and many more. Make your accounts safe again! Features: - Ads free - Encrypted iCloud Sync - Siri Support - Apple Watch support - Notification Center widget - Safari extension for pasting passwords into websites - Secure application using Face ID/Touch ID (or password) - Create encrypted backups of all accounts - Import/Export encrypted accounts using AirDrop, iCloud, Dropbox, Mail, ... - Works offline All data stored by OTP Auth is stored using strong AES-256 encryption. This applies for all data. In particular, for both locally stored data as well as data stored in the iCloud Drive (when iCloud Sync is enabled). The password for those files never leaves your device such that noone but you can read your data. OTP Auth does not collect information about you or send them anywhere. You won't be asked to allow access to your contacts or your location. And most important: OTP Auth does not connect to the internet and will not send your accounts to someone else! (Unless you enable iCloud sync where an AES-256 encrypted copy of your accounts is stored in your iCloud Drive. The password for that copy will never leave your phone.) Follow me on Twitter: @otpauth

About

One

This utility generates a secure, eight-digit disposable password every minute. These one-time passwords are ideal for enhancing security across various online services, as they become invalid after a short period, even if compromised.

Highlights
  • Generates eight-digit passwords
  • Passwords valid for one minute
  • Enhances online service security
  • Disposable password functionality
  • Requires OTP application at service
Features
Read full description

What is One-Time Password? One-Time Password is the disposable password which is effective solely once. In this Application, a random eight digit password is generated every one minute. You can securely use the various kinds of services because the password is invalidated in one minute even if the password is stolen. For using this App, it is required to apply for the OTP at the service which adopted this App. As applying for the OTP, the email notification about the App procedure will be delivered at the email address registered.

Screenshots

OTP Auth4 screens
One4 screens

Verdict

The call

The clearest difference is review sentiment: OTP Auth at 78% against One's 13%. OTP Auth also leads on update cadence (every 2 weeks vs every 5 months) and device support (4 vs 2). One's advantage is in-app purchases (none vs 1). On price and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OTP Auth sells 1 one-off in-app purchase. One asks for nothing beyond the download.

UpkeepUpdate frequency

OTP Auth ships an update every 2 weeks, One every 5 months. The most recent releases landed on October 2, 2026 and September 19, 2026 respectively.

Scorecard6 real differences · 4 level
OTP Auth versus One: the parameters behind the verdict, then further details
ParameterOTP AuthOne
PriceFreeFree
Rating4.6 (463 ratings) — better—
Positive reviews77.9% of reviews — better12.5% of reviews
Number of ratings463 — better—
Update frequencyEvery 2 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS12.0 — better14.0
Further details — not scored
Size22 MB49 MB
Age rating4+4+
DeveloperRoland MoersNTT DATA GROUP CORPORATION

Customer experience

OTP Auth

All ratings463 ratings
Positive90.3%
Neutral2.6%
Negative7.1%
Written reviews204 reviews
Positive77.9%
Neutral5.9%
Negative16.2%

One

Written reviews8 reviews
Positive12.5%
Neutral12.5%
Negative75.0%

Bugs and requests

OTP Auth

Reported bugs

3 issues
  • Sync issues causing data loss
  • Widget not displaying codes correctly
  • Crashes on certain iOS versions

Requested features

4 requests
  • Larger text/font size options
  • Alphabetical sorting of accounts
  • Automatic account refresh/update
  • Ability to edit account details

One

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

OTP Auth

One-time1
  • OTP Auth Pro$3.99
None

One

No in-app purchases

Questions

Is OTP Auth free?
OTP Auth is free to download, with in-app purchases available.
Is One free?
One is free to download, with no in-app purchases.
Do OTP Auth or One have ads?
Neither OTP Auth nor One shows ads.
Which is updated more often, OTP Auth or One?
OTP Auth ships an update every 2 weeks, and One every 5 months. Most recently, OTP Auth was updated on October 2, 2026 and One on September 19, 2026.

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