# Cogni vs Cardstack Study

The clearest difference is in-app purchases: Cardstack Study at none against Cogni's 9. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Cogni sells 9 in-app purchases, starting at $4.99 per month. Cardstack Study asks for nothing beyond the download.

## The numbers

| Metric | Cogni | Cardstack Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.7K ratings)](https://appshunter.io/ios/app/cogni-ai-flashcards-and-notes/id6737768905/reviews)** | — |
| Number of ratings | **1.7K** | — |
| Positive reviews | 35.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 33 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [COGNIFLY LTD](https://appshunter.io/developer/1808620132) | [Angus Gibson](https://appshunter.io/developer/6786447381) |

## What reviewers say

### Cogni

[App page](https://appshunter.io/ios/app/cogni-ai-flashcards-and-notes/id6737768905)

Create and study flashcards using an AI-enhanced spaced repetition algorithm to optimize learning. Access a vast library of pre-made decks and track your progress with detailed statistics. Study offline with media-supported flashcards.

**Highlights:** AI-enhanced spaced repetition, Create and review flashcards, Library of pre-made decks, Detailed statistics and progress tracking, Offline access with media support, Customizable flashcard creation

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Monthly | $7.99 | per month |
| Premium Monthly | $14.99 | per month |
| Premium Annual | $19.99 | per year |
| Premium Annual | $24.99 | per year |
| Premium Annual | $29.99 | per year |
| Premium Annual | $49.99 | per year |
| Lifetime Premium | $69.99 | one-time |
| Premium Lifetime | $99.99 | one-time |

**What reviewers like**

- 👍 Great app for memorizing and growing recall skills
- 🚀 Lifesaver for challenging, memory-heavy subjects like med school
- 👍 Sleek and user-friendly interface, no distractions

**What reviewers complain about**

- 🐛 Locked up referring to an upgrade page, couldn't continue using the app
- 🐛 Not easy to use, inaccurate for Spanish language
- 🐛 Desktop flashcards deck won't sync with mobile, forcing duplicate work

**Reported bugs**

- App no longer available after paying for annual subscription
- Occasional crashes

**Requested features**

- Integrate ChatGPT or Claude for automatic card creation
- Add sub-decks for larger decks that need more review
- Improve algorithm for hard/again ratings to better target struggling cards
- Add subsections for decks to study different sections separately


### Cardstack Study

[App page](https://appshunter.io/ios/app/cardstack-study/id6786447379)

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

**In-app purchases:** none


## Frequently asked questions

### Is Cogni free?

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

### Is Cardstack Study free?

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

### Do Cogni or Cardstack Study have ads?

Neither Cogni nor Cardstack Study shows ads.

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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.*