# Duosub vs Engram

The clearest difference is update cadence: Engram at weekly against Duosub's every 3 weeks. Duosub's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Duosub sells 1 in-app purchase, starting at $1.99 per month and Engram sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Duosub ships an update every 3 weeks, Engram weekly. The most recent releases landed on July 22, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Duosub | Engram |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 84 MB | 4 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GOWS LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1734173309) | [Hirosuke Yonekubo](https://appshunter.io/developer/1625472869) |

## What reviewers say

### Duosub

[App page](https://appshunter.io/ios/app/duosub/id6507464076)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| チケット無制限プラン | $1.99 | per month |


### Engram

[App page](https://appshunter.io/ios/app/engram-memory-training/id6784637263)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Engram Pro (Monthly) | $3.99 | per month |
| Engram Pro (Yearly) | $24.99 | per year |


## Frequently asked questions

### Is Duosub free?

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

### Is Engram free?

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

### Do Duosub or Engram have ads?

Neither Duosub nor Engram shows ads.

### Which is updated more often, Duosub or Engram?

Duosub ships an update every 3 weeks, and Engram weekly. Most recently, Duosub was updated on July 22, 2026 and Engram on September 7, 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.*