# Retain vs Sequencer 02

The clearest difference is in-app purchases: Sequencer 02 at none against Retain's 2. Sequencer 02 also leads on update cadence (every 6 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Retain sells 2 in-app purchases, starting at $4.99 per month. Sequencer 02 asks for nothing beyond the download.

Retain ships an update every 3 weeks, Sequencer 02 every 6 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Retain | Sequencer 02 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/retain-ai-flashcards/id6469217518/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 54 MB | 18 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Paul Evans](https://appshunter.io/developer/1711681032) | [Francois Fouqueau](https://appshunter.io/developer/1892826517) |

## What reviewers say

### Retain

[App page](https://appshunter.io/ios/app/retain-ai-flashcards/id6469217518)

This minimalist flashcard app uses AI to help you create and study. Its intelligent spaced repetition algorithm optimizes review intervals for efficient learning and rapid progress. Choose from different card layouts to keep your study sessions engaging.

**Highlights:** AI-generated flashcards, Customizable card layouts, Spaced repetition algorithm, Minimalist design, Progress tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $29.99 | per year |


### Sequencer 02

[App page](https://appshunter.io/ios/app/sequencer-02/id6791747186)

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

**In-app purchases:** none


## Frequently asked questions

### Is Retain free?

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

### Is Sequencer 02 free?

Sequencer 02 is free to download, with no in-app purchases.

### Do Retain or Sequencer 02 have ads?

Neither Retain nor Sequencer 02 shows ads.

### Which is updated more often, Retain or Sequencer 02?

Retain ships an update every 3 weeks, and Sequencer 02 every 6 days. Most recently, Retain was updated on November 7, 2026 and Sequencer 02 on October 31, 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.*