# Synap vs Cardoo

The clearest difference is in-app purchases: Synap at none against Cardoo's 2. Synap also leads on ads (none vs shown). Cardoo's advantage is update cadence (daily vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Cardoo sells 2 in-app purchases, starting at $3.99 per 7 days. Synap asks for nothing beyond the download.

Synap ships an update every 6 weeks, Cardoo daily. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Synap | Cardoo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Daily** |
| Monetization | Free | — |
| Size | 31 MB | 59 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Synap Learning Limited](https://appshunter.io/developer/859343131) | [DAVID GLAUBER DE GUSMAO CERQUEIRA LIMA 12292099489](https://appshunter.io/developer/1822826650) |

## What reviewers say

### Synap

[App page](https://appshunter.io/ios/app/synap/id1029982959)

This app utilizes a Spaced Repetition System to deliver daily quizzes tailored to your learning needs. It helps build knowledge and memory over time by focusing on areas requiring the most practice.

**Highlights:** Spaced Repetition System, Daily personalized quizzes, On-the-go portal access, Knowledge and memory building, Focused practice

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

**In-app purchases:** none


### Cardoo

[App page](https://appshunter.io/ios/app/cardoo-study-flashcards/id6747777545)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DooPlus: Weekly | $3.99 | per 7 days |
| DooPlus | $41.99 | per year |


## Frequently asked questions

### Is Synap free?

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

### Is Cardoo free?

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

### Do Synap or Cardoo have ads?

Cardoo shows ads; Synap does not.

### Which is updated more often, Synap or Cardoo?

Synap ships an update every 6 weeks, and Cardoo daily. Most recently, Synap was updated on October 13, 2026 and Cardoo on October 10, 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.*