# Cogno vs Perfect Days

The clearest difference is update cadence: Perfect Days at weekly against Cogno's every 8 months. Perfect Days also leads on device support (4 vs 2) and iOS requirement (15.0 vs 26.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Cogno ships an update every 8 months, Perfect Days weekly. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Cogno | Perfect Days |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Size | 58 MB | 26 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Yuichi Matsuoka](https://appshunter.io/developer/1855259049) | [ADDNESS INC.](https://appshunter.io/developer/1644845477) |

## What reviewers say

### Cogno

[App page](https://appshunter.io/ios/app/cogno/id6755649034)

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

**In-app purchases:** none


### Perfect Days

[App page](https://appshunter.io/ios/app/perfect-days/id6793997828)

**In-app purchases:** none


## Frequently asked questions

### Is Cogno free?

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

### Is Perfect Days free?

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

### Do Cogno or Perfect Days have ads?

Neither Cogno nor Perfect Days shows ads.

### Which is updated more often, Cogno or Perfect Days?

Cogno ships an update every 8 months, and Perfect Days weekly. Most recently, Cogno was updated on October 20, 2026 and Perfect Days 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.*