# Cogni vs StudyDeck

The clearest difference is review sentiment: StudyDeck at 100% against Cogni's 35%. Cogni's advantage is iOS requirement (16.4 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Cogni sells 9 in-app purchases, starting at $4.99 per month and StudyDeck sells 2 in-app purchases, starting at $12.99 per year. Whichever you choose, the download price is not the number that matters.

Cogni ships an update fortnightly, StudyDeck every 2 weeks. The most recent releases landed on September 23, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Cogni | StudyDeck |
| --- | --- | --- |
| 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 | 34.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 62 MB | 13 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [COGNIFLY LTD](https://appshunter.io/developer/1808620132) | [Frederic Bacro](https://appshunter.io/developer/1482824795) |

## 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 | $49.99 | 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


### StudyDeck

[App page](https://appshunter.io/ios/app/studydeck-ai-flashcards/id6760428575)

Transform notes, PDFs, or photos into AI-powered flashcards instantly. Offers seven study modes, including spaced repetition and practice tests, to help you learn smarter and ace exams. On-device AI ensures your study materials remain private.

**Highlights:** AI-powered flashcard generation, Import notes, PDFs, and photos, Seven distinct study modes, Spaced repetition (FSRS algorithm), On-device AI for privacy, Progress tracking and analytics, Share decks with classmates

**Features:** Safari Extension, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StudyDeck Premium Annual | $12.99 | per year |
| Lifetime Pass | $39.99 | one-time |


## Frequently asked questions

### Is Cogni free?

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

### Is StudyDeck free?

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

### Do Cogni or StudyDeck have ads?

Neither Cogni nor StudyDeck shows ads.

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

Cogni ships an update fortnightly, and StudyDeck every 2 weeks. Most recently, Cogni was updated on September 23, 2026 and StudyDeck on September 16, 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.*