# KUU vs CatDays

The clearest difference is rating: KUU at 4.9 against CatDays's 4.0. KUU also leads on update cadence (every 3 days vs every 3 weeks) and device support (4 vs 1). CatDays's advantage is ads (none vs shown) and review sentiment (83% vs 52%). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. KUU sells 3 in-app purchases, starting at $5.99 per month and CatDays sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

KUU holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 9 and 8 respectively. Written reviews complicate that: 52% of KUU's written reviews are positive against 83% of CatDays's, so the app with the better star average is not the one people write more warmly about.

KUU ships an update every 3 days, CatDays every 3 weeks. Both last shipped on November 5, 2026.

## The numbers

| Metric | KUU | CatDays |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (9 ratings)](https://appshunter.io/ios/app/kuu-overthinking-brain-dump/id6771264775/reviews)** | [4.0 (8 ratings)](https://appshunter.io/ios/app/catdays-cat-countdown/id6773580078/reviews) |
| Number of ratings | **9** | 8 |
| Positive reviews | 51.6% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 36 MB | 38 MB |
| Requires iOS | 26.0 | **17.5** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shunya Yamashita](https://appshunter.io/developer/1841624282) | [Lychee Intelligence Co., Ltd.](https://appshunter.io/developer/1778934446) |

## What reviewers say

### KUU

[App page](https://appshunter.io/ios/app/kuu-overthinking-brain-dump/id6771264775)

This app provides a voice-first method for offloading scattered thoughts, worries, and ideas. It transcribes your spoken words and categorizes them into 'Now', 'Later', 'Park', and 'Let go' sections to help clear your mind.

**Highlights:** Voice-to-text transcription, Thought categorization (Now, Later, Park, Let go), ADHD-friendly design, Private iCloud sync, Menu bar integration for Mac, No raw audio storage

**Features:** Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KUU+ Monthly | $5.99 | per month |
| KUU+ Yearly | $39.99 | per year |
| KUU+ Lifetime | $89.99 | one-time |


### CatDays

[App page](https://appshunter.io/ios/app/catdays-cat-countdown/id6773580078)

Track important dates with a customizable cat companion. Choose from various feline friends to count down to future events or count up days since past milestones. Receive gentle reminders and view your progress with home screen widgets.

**Highlights:** Countdown and count-up modes, Selectable cat companions, Customizable reminders, Home screen widgets, iCloud synchronization, Ad-free experience

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Leo | $2.99 | one-time |
| Luna | $2.99 | one-time |
| Tofu | $2.99 | one-time |
| Ash | $2.99 | one-time |
| Milo | $2.99 | one-time |
| Pumpkin | $2.99 | one-time |
| Leo & Luna Pack | $3.99 | one-time |
| Original Cats Pack | $4.99 | one-time |


## Frequently asked questions

### Is KUU free?

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

### Is CatDays free?

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

### Which has better reviews, KUU or CatDays?

KUU is rated higher. KUU averages 4.9 out of 5 from 9 ratings, while CatDays averages 4.0 from 8 ratings.

### Do KUU or CatDays have ads?

KUU shows ads; CatDays does not.

### Which is updated more often, KUU or CatDays?

KUU ships an update every 3 days, and CatDays every 3 weeks. Most recently, KUU was updated on November 5, 2026 and CatDays 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.*