# HiMemo2 vs Amethyst Authenticator

The clearest difference is update cadence: Amethyst Authenticator at every 3 days against HiMemo2's monthly. Amethyst Authenticator also leads on iOS requirement (18.2 vs 26.0). HiMemo2's advantage is device support (4 vs 1). On price, ads and in-app purchases there is nothing between them.

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

HiMemo2 ships an update monthly, Amethyst Authenticator every 3 days. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | HiMemo2 | Amethyst Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Free | — |
| Size | 2 MB | 3 MB |
| Requires iOS | 26.0 | **18.2** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Kawai](https://appshunter.io/developer/1286509355) | [Mia Lina Koring](https://appshunter.io/developer/1752380606) |

## What reviewers say

### HiMemo2

[App page](https://appshunter.io/ios/app/himemo2/id1614965391)

Organize information with a simple, hierarchical structure. Easily add, edit, and view data in a tree format, and export it to other apps. Syncs across Apple devices and is accessible on Apple Watch.

**Highlights:** Hierarchical data entry and management, Cross-device sync (iPhone, iPad, Mac), Apple Watch browsing, Enhanced search functionality, Simple and intuitive UI, Plain text and HTML export

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### Amethyst Authenticator

[App page](https://appshunter.io/ios/app/amethyst-authenticator/id6743655651)

**In-app purchases:** none


## Frequently asked questions

### Is HiMemo2 free?

HiMemo2 is free to download, with no in-app purchases.

### Is Amethyst Authenticator free?

Amethyst Authenticator is free to download, with no in-app purchases.

### Do HiMemo2 or Amethyst Authenticator have ads?

Neither HiMemo2 nor Amethyst Authenticator shows ads.

### Which is updated more often, HiMemo2 or Amethyst Authenticator?

HiMemo2 ships an update monthly, and Amethyst Authenticator every 3 days. Most recently, HiMemo2 was updated on October 27, 2026 and Amethyst Authenticator on October 28, 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.*