# Stacks vs Cortx

The clearest difference is update cadence: Cortx at every 9 days against Stacks's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Stacks sells 2 in-app purchases, starting at $9.99 per 3 months and Cortx sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Stacks ships an update every 3 months, Cortx every 9 days. The most recent releases landed on October 16, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Stacks | Cortx |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Freemium | — |
| Size | 77 MB | 29 MB |
| Requires iOS | 16.4 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lewis Hoy](https://appshunter.io/developer/1812196615) | [Henri Delozanne](https://appshunter.io/developer/1865948709) |

## What reviewers say

### Stacks

[App page](https://appshunter.io/ios/app/stacks-language-flashcards/id6745429203)

Create flashcards from your own experiences and conversations. This app uses spaced repetition to help you remember vocabulary longer with less study. It supports over 100 languages and offers offline study capabilities.

**Highlights:** Create cards from stories and conversations, Spaced repetition system (FSRS), Offline study mode, Automatic translations, Supports over 100 languages, Romanization for select scripts, Clean, minimal interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stacks+ Quarterly | $9.99 | per 3 months |
| Stacks+ Yearly | $27.99 | per year |


### Cortx

[App page](https://appshunter.io/ios/app/cortx-flashcard-revisions/id6757309534)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Monthly (Free Trial) | $2.99 | per month |
| Memo Pro Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is Stacks free?

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

### Is Cortx free?

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

### Do Stacks or Cortx have ads?

Neither Stacks nor Cortx shows ads.

### Which is updated more often, Stacks or Cortx?

Stacks ships an update every 3 months, and Cortx every 9 days. Most recently, Stacks was updated on October 16, 2026 and Cortx on October 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.*