# Katav vs Synapsi

The clearest difference is iOS requirement: Katav at 15.1 against Synapsi's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Katav sells 8 in-app purchases, starting at $6.99 per month and Synapsi sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Katav ships an update every 5 days, Synapsi every 3 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Katav | Synapsi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 78 MB | 82 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [William Zimmermann](https://appshunter.io/developer/1281177749) | [Khoa Tran](https://appshunter.io/developer/1523512472) |

## What reviewers say

### Katav

[App page](https://appshunter.io/ios/app/katav/id6772588945)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Katav PRO Monthly | $6.99 | per month |
| Pro | $6.99 | per month |
| Katav MAX Monthly | $9.99 | per month |
| Pro - Quarterly | $19.99 | per 3 months |
| Katav PRO Annual | $29.99 | per year |
| Katav MAX Annual | $44.99 | per year |
| Pro Yearly | $67.99 | per year |
| 99 Extra Subjects | $0.99 | one-time |


### Synapsi

[App page](https://appshunter.io/ios/app/synapsi-ai-study-notes/id6780159251)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synapsi Pro Monthly | $9.99 | per month |
| Synapsi Pro Yearly | $48.00 | per year |


## Frequently asked questions

### Is Katav free?

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

### Is Synapsi free?

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

### Do Katav or Synapsi have ads?

Neither Katav nor Synapsi shows ads.

### Which is updated more often, Katav or Synapsi?

Katav ships an update every 5 days, and Synapsi every 3 days. Most recently, Katav was updated on October 31, 2026 and Synapsi on November 5, 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.*