# Duse vs Amethyst Authenticator

The clearest difference is in-app purchases: Amethyst Authenticator at none against Duse's 4. Amethyst Authenticator also leads on update cadence (every 3 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Duse sells 4 in-app purchases, starting at $1.99 per month. Amethyst Authenticator asks for nothing beyond the download.

Duse ships an update every 2 weeks, Amethyst Authenticator every 3 days. The most recent releases landed on September 13, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Duse | Amethyst Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (16 ratings)](https://appshunter.io/ios/app/duse-habit-tracker/id6742254716/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 36 MB | 3 MB |
| Requires iOS | **17.0** | 18.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andy Arevalo](https://appshunter.io/developer/1853674132) | [Mia Lina Koring](https://appshunter.io/developer/1752380606) |

## What reviewers say

### Duse

[App page](https://appshunter.io/ios/app/duse-habit-tracker/id6742254716)

This app helps you build lasting habits and achieve your goals with a simple, customizable interface. Track good and bad habits with flexible frequencies, set personalized goals, and receive powerful reminders. Visualize your progress with insightful statistics and unlock achievements.

**Highlights:** Track good and bad habits, Flexible tracking frequencies (daily, weekly, monthly), Customizable goals and units, Multiple customizable reminders, Insightful statistics and progress visualization, Home and lock screen widgets, Achievements and notes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.99 | per month |
| Yearly Premium (7-Day Trial) | $7.99 | per year |
| Yearly Premium | $7.99 | per year |
| Lifetime Access | $14.99 | one-time |


### Amethyst Authenticator

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

**In-app purchases:** none


## Frequently asked questions

### Is Duse free?

Duse is free to download, with in-app purchases available.

### Is Amethyst Authenticator free?

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

### Do Duse or Amethyst Authenticator have ads?

Neither Duse nor Amethyst Authenticator shows ads.

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

Duse ships an update every 2 weeks, and Amethyst Authenticator every 3 days. Most recently, Duse was updated on September 13, 2026 and Amethyst Authenticator on September 20, 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.*