# IIJ SmartKey vs One

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.

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

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.

## The numbers

| Metric | IIJ SmartKey | One |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 10.0% of reviews | **12.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 19 MB | 49 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Internet Initiative Japan, Inc.](https://appshunter.io/developer/444664358) | [NTT DATA GROUP CORPORATION](https://appshunter.io/developer/478236616) |

## What reviewers say

### IIJ SmartKey

[App page](https://appshunter.io/ios/app/iij-smartkey/id974476420)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### One

[App page](https://appshunter.io/ios/app/one-time-password/id1028958661)

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:** Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*