Comparison

IIJ SmartKey vs One

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

Head to head
About

IIJ SmartKey

This app generates one-time passwords for two-step verification, enhancing online security. It supports TOTP standards and offers slide authentication for convenient logins. Additional features include app locking and cross-device data backup.

Highlights
  • Generates TOTP one-time passwords
  • Supports slide authentication
  • App locking with Touch ID/passcode
  • Cross-device data backup
  • Compatible with Google Authenticator
Features
Read full description

Only enterprise user needs to register your device. You can skip registering your device, if you don't need it. The IIJ SmartKey app produces one-time passwords that conform to TOTP (RFC 6238) standards and can be used in the 2-step verification processes of a variety of online services supporting TOTP. Strengthen your online service security by linking this app, installed to your smartphone device, with your ID/password verification processes. Slide authentication can be used (ver 2.0). When logging in to a service that supports slide authentication, you will receive a push notification on your smartphone. Then you can pull the service icon for 2-step verification. For details, please visit http://www.iij.ad.jp/biz/smartkey-m/ (Written in Japanese). * To use slide authentication, you must register your device. β–  Special Features * Protects against unauthorized access by allowing the user to lock the app using a Touch ID or passcode. * Supports device changes and data backups by handing over settings between devices. * Compatible with the Google Authenticator (TOTP authentication). * Supports slide authentication. * Easy to see and read, simple and refined design. β–  Confirmed Supported Services (TOTP authentications) * Amazon Web Services * Dropbox * Evernote * Facebook * GitHub * Google Accounts * Google Apps for Work * IIJ Omnibus * IIJ Secure MX Service * Microsoft Accounts * Slack * WordPress.com β–  Confirmed Supported Services (Slide authentications) * Additional details on available services is expected soon. β– β–  Please make sure to read the information below before using the app. * When switching devices, please check the app help page (https://www1.auth.iij.jp/smartkey/en/help_v2.html) before transferring service settings from your old device to the new one. * Please ensure that you confirm service restoration procedures for the various online services you utilize in advance to protect yourself against cases in which you are unable to complete the 2-step verification process due to device loss or accidental deletion of service settings. * When backing up this app to iTunes, it is necessary to encrypt the backup files. This app does not support backups to the iCloud service. β– User Agreement All users of this app must consent to the User Agreement found below before using the app. https://www1.auth.iij.jp/smartkey/en/agreement_v2.html ----- Mentioned company names and service names are the trademarks or registered trademarks of their respective companies.

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

IIJ SmartKey4 screens
One4 screens

Verdict

The call

The clearest difference is iOS requirement: IIJ SmartKey at 12.0 against One's 14.0. On price, review sentiment, update cadence and ads there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

IIJ SmartKey ships an update every 9 months, One every 5 months. The most recent releases landed on August 17, 2026 and September 4, 2026 respectively.

Scorecard1 real difference Β· 7 level
IIJ SmartKey versus One: the parameters behind the verdict, then further details
ParameterIIJ SmartKeyOne
PriceFreeFree
Positive reviews10.0% of reviews12.5% of reviews β€” better
Update frequencyEvery 9 monthsEvery 5 months β€” better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.0 β€” better14.0
Further details β€” not scored
Size19 MB49 MB
Age rating4+4+
DeveloperInternet Initiative Japan, Inc.NTT DATA GROUP CORPORATION

Customer experience

IIJ SmartKey

Written reviews20 reviews
Positive10.0%
Neutral5.0%
Negative85.0%

One

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

In-app purchases

None

IIJ SmartKey

No in-app purchases

None

One

No in-app purchases

Questions

Is IIJ SmartKey free?
IIJ SmartKey is free to download, with no in-app purchases.
Is One free?
One is free to download, with no in-app purchases.
Do IIJ SmartKey or One have ads?
Neither IIJ SmartKey nor One shows ads.
Which is updated more often, IIJ SmartKey or One?
IIJ SmartKey ships an update every 9 months, and One every 5 months. Most recently, IIJ SmartKey was updated on August 17, 2026 and One on September 4, 2026.

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