# Cogni vs FlashStacks

Cogni and FlashStacks both sit at 4.7 stars, but that hides the real split: 100% of FlashStacks's written reviews are positive against 36% of Cogni's. Cogni's advantage is ratings volume (1.7K vs 7). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Cogni sells 9 in-app purchases, starting at $4.99 per month and FlashStacks sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Cogni against 4.6 for FlashStacks. That said, the two scores are not equally well evidenced: Cogni has 1.7K ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 36% of Cogni's written reviews are positive against 100% of FlashStacks's.

Cogni ships an update every 10 days, FlashStacks every 8 days. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Cogni | FlashStacks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.7K ratings)](https://appshunter.io/ios/app/cogni-ai-flashcards-and-notes/id6737768905/reviews)** | [4.6 (7 ratings)](https://appshunter.io/ios/app/flashstacks-flashcard-study/id6762071988/reviews) |
| Number of ratings | **1.7K** | 7 |
| Positive reviews | 35.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 8 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 68 MB | 11 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [COGNIFLY LTD](https://appshunter.io/developer/1808620132) | [Bailey Skewes](https://appshunter.io/developer/1892771018) |

## What reviewers say

### Cogni

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

Create and study flashcards to master new materials efficiently. Utilize an enhanced spaced repetition algorithm to optimize study sessions for exams, languages, or complex subjects. Millions trust this method to achieve their learning goals.

**Highlights:** Create and review custom flashcards, Spaced repetition algorithm, Pre-made deck library, AI-enhanced recall, Progress tracking, Offline access

**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


### FlashStacks

[App page](https://appshunter.io/ios/app/flashstacks-flashcard-study/id6762071988)

Transform study materials into interactive Home Screen widgets. AI generates flashcards from PDFs, and spaced repetition optimizes learning. Visualize concepts with image occlusion and track progress with detailed stats.

**Highlights:** Home and Lock Screen widgets, AI-powered PDF to flashcard generation, Spaced repetition learning, Image occlusion cards, Progress tracking and stats, Customizable widget themes

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FlashStacks Premium — Monthly | $4.99 | per month |
| Premium Special Offer | $24.99 | per year |
| FlashStacks Premium — Annual | $39.99 | per year |


## Frequently asked questions

### Is Cogni free?

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

### Is FlashStacks free?

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

### Which has better reviews, Cogni or FlashStacks?

Cogni is rated higher. Cogni averages 4.7 out of 5 from 1.7K ratings, while FlashStacks averages 4.6 from 7 ratings.

### Do Cogni or FlashStacks have ads?

Neither Cogni nor FlashStacks shows ads.

### Which is updated more often, Cogni or FlashStacks?

Cogni ships an update every 10 days, and FlashStacks every 8 days. Most recently, Cogni was updated on October 27, 2026 and FlashStacks on October 25, 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.*