Comparison

KUU vs CatDays

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KUU

This app helps declutter your mind by allowing you to speak your thoughts. It transcribes your voice and categorizes your ideas into 'Now,' 'Later,' 'Park,' and 'Let go' to reduce mental load.

Highlights
  • Voice-to-text transcription
  • Automatic thought categorization
  • Four distinct holding spaces for ideas
  • Private iCloud syncing
  • Menu bar integration for Mac
  • Focus on mental space, not productivity
Features
Read full description

When your head is full, it can be hard to know what belongs in front of you and what can wait. KUU is a quiet voice-first app for brain dumps, overthinking, scattered ideas, and the small worries you do not want to keep carrying. You can speak what is on your mind. It does not need to be organized. KUU turns what you said into text and gently separates it four ways: Now / Later / Park / Let go. The point is not to do more. It is to make a little room in your head. ■ When to use it - Before bed, when your mind starts running. - When the same thought keeps looping. - When task managers have started to feel heavy. - When you want to be heard, but do not want to send it to anyone. - When talking out loud helps you understand what you mean. - When an idea appears before it has a shape. - When you do not want to forget something, but it is not ready to act on. - When voice feels easier than typing. - When your hands are busy: driving, cooking, getting ready, or moving through the day. ■ The 4 ways Now — Something that may feel lighter if you look at it soon. Later — Something to return to at another time. Park — An idea, feeling, or question that does not need an answer yet. Let go — A worry or thought you may not need to keep holding. These are not priorities or scores. They are quiet ways to hold what you said. ■ How KUU is different - Unlike a notes app, KUU starts with speaking, not writing. - Unlike a task manager, KUU does not turn every thought into something to do. - Unlike an AI chat, KUU does not give long advice or add more things to think about. KUU receives what you said and separates it into smaller, easier pieces. ■ What you can do - Speak naturally, even when your thoughts are all mixed up. - See your words as text. - See only what needs your attention now. - Keep later thoughts, parked ideas, and things to let go in their own places. - Revisit what you have said when you want to. ■ Voice and data - Raw audio is not kept. - What you said is saved as text so you can look back later. - Sorting uses AI. Only your words as text are sent, and nothing is kept. - Your saved text syncs only to your private iCloud. - Other people, and the app developer, cannot read it. ■ On your Mac KUU waits quietly in the menu bar. You can speak without opening a window, and it carries all the way through to Now / Later / Park / Let go. What you said before is always a glance away. KUU is not here to add more thoughts. It is here for the space between: “I do not need to solve this right away” and “I do not want to keep holding it in my head.” — Speaking makes room in your mind. Terms of Use: https://kuu-zen.com/en/terms/ Privacy Policy: https://kuu-zen.com/en/privacy/

About

CatDays

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
Read full description

CatDays is a minimalist countdown and day counter app. Choose a cat for every day that matters. It’ll wait with you for what’s ahead and remember how far you’ve come. Whether you’re looking forward to something in the future or marking a journey already underway, leave the counting to a cat. Every time you open CatDays, it’ll be right there, counting with you. ・Two ways to count: down and up Count down the days until something ahead, or count up the days since something began. Birthdays, trips, anniversaries, exams, or every day since you gave something up—CatDays can keep track of them all. ・The days you’ve lived are worth keeping Every season of anticipation and perseverance deserves to be remembered. One-time countdowns automatically move to Memories after they end. When a chapter comes to a close, you can stop a count-up on the exact day it ended. If you want to keep going, you can bring it back and continue counting anytime. ・A cat of your own Every date can have its own cat. Give it a tap and it’ll strike a new pose and talk to you—every cat has a personality of its own, so each moment together feels a little different. ・Your cat will remind you when it matters When an important day is near or arrives, your cat will send a gentle reminder. It’ll also check in when a count-up reaches a milestone worth marking. Turn reminders on or off and choose your preferred reminder time in Settings—quiet and never intrusive. ・Home Screen widgets put your cat where you’ll always see it Choose from Small and Medium countdown widgets and select the dates you want to display. A Medium widget can also show up to three countdowns at once. Your cat will change poses from time to time, so every glance feels a little different. Tap a widget to jump straight to the details in CatDays—a companion you can see every day. Lock Screen widgets are available too, so you can check the day count without unlocking your iPhone. ・Cat calendar widgets for every day Choose from a variety of cat calendar widgets featuring month, today, and week layouts. Pick your favorite cat and let it keep you company on your Home Screen every day. ・Automatic iCloud sync Your countdown data can sync automatically through iCloud across devices signed in to the same Apple Account, so it stays with you when you switch phones. Your content is stored on your device and in your personal iCloud and is never sent to our servers. ・Clean, calming, and free from distractions No ads, no subscriptions, and no complicated setup. Open CatDays and all you’ll see are your cats and the days that matter to you. 【Meet the Cats】 Included for free: Coco. More cats can be unlocked from the Cat Shop in Settings. Each cat is a one-time purchase and yours to use forever—no subscription required. Want to bring several home at once? Choose a pack for a better value. 【About Purchases】 CatDays is free to download, with all core features included. Additional cat characters are available as one-time purchases with no subscription fees. You can restore previously purchased content anytime from “Restore Purchases” in Settings. Let a cat keep track of the days that matter. Privacy Policy: https://catdays.app/en/privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

KUU4 screens
CatDays4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 4 level
KUU versus CatDays: the parameters behind the verdict, then further details
ParameterKUUCatDays
PriceFreeFree
Rating4.9 (9 ratings) — better4.0 (8 ratings)
Positive reviews51.6% of reviews83.3% of reviews — better
Number of ratings9 — better8
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone
Requires iOS26.017.5 — better
Further details — not scored
Size36 MB38 MB
Age rating4+4+
DeveloperShunya YamashitaLychee Intelligence Co., Ltd.

Customer experience

KUU

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews31 reviews
Positive51.6%
Neutral12.9%
Negative35.5%

CatDays

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

3 purchases

KUU

Subscriptions2
  • KUU+ Monthly$5.991 Month
  • KUU+ Yearly3 Days trial$39.991 Year
One-time1
  • KUU+ Lifetime$89.99
8 purchases

CatDays

One-time8
  • Leo$2.99
  • Luna$2.99
  • Tofu$2.99
Show 5 more
  • Ash$2.99
  • Milo$2.99
  • Pumpkin$2.99
  • Leo & Luna Pack$3.99
  • Original Cats Pack$4.99

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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