iDay vs Fatty Cat!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iDay
This app helps you focus and overcome procrastination using the Pomodoro Technique. It offers customizable timers, ambient sounds, and study modes to create a distraction-free environment for work and study.
- Pomodoro Technique timer (25 min focus, 5 min rest)
- Customizable focus and rest timers
- Ambient soundscapes (waves, rain, forest, cafe)
- Study area with flip mode to prevent phone use
- Task reminders and procrastination tools
- Data statistics for tracking efforts
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iDay,开启一段美好的专注时光。 为什么需要iDay? - 总是被各种琐事和诱惑打断,无法长时间专心投入 - 因为拖延和懒惰,明明很多事情,却无法开始 - 时间无情流逝,不知道如何开始新的一天 - 试过很多时间管理法,却依然效率低下于事无补 - 事情越来越多,时间越来越少,压力越来越大 - 长时间伏案工作,忘记舒展身体、忘记喝水 如果你有以上困扰,试试「iDay」,让你暂时放下手机,开启你的专注旅程。 iDay是什么? 「iDay」是一个让你可以暂时放下手机、专心投入的 App。每当你想开始一段专心投入的时光,你可以在「iDay」中选择一个任务并开始专注。接下来的时间里,伴着海浪、雨声、森林、冥想或是咖啡厅的环境声音,你会心无旁骛专心投入。之后,你可以休息一小会儿或是继续下一段专注。每一天,都有成千上万的人在iDay开启专注旅程,和时间做朋友,遇见更好的自己。 「iDay」的主要功能 - 基于番茄工作法,每次专注 25 分钟,间隔休息 5 分钟 - 支持时长与休息模式自定义,定制顺心顺手的专注计时器 -任务提醒 ,定时任务提醒,培养专注习惯,摆脱拖延症 -学霸专区,开启学霸模式、翻转模式,让你在专注的时候更好地远离手机 -数据统计 让你的努力有迹可循 成为更好的人的路上,偶尔会孤单也偶尔会枯燥,希望我们一起度过,一起成长。
Fatty Cat!
This app transforms study sessions into an engaging adventure with an interactive cat companion. Earn coins, customize your cat and environment, and track progress to improve study habits. Features include immersive mode and white noise for enhanced focus.
- Virtual cat study companion
- Interactive study sessions
- Customization shop
- Goals and statistics tracking
- Immersive mode
- White noise support
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Step into the enchanting world of Fatty Cat, your unmistakable study buddy that turns the mundane study routine into an irresistible adventure! Studying has never been this fun, thanks to this adorable cat that will guide you through every step of your study day. • Your Study, His Well-being: Fatty Cat is not just a cute cat; he's the living representation of your dedication to studying. Keep your kitty in tip-top shape by feeding him with regular study sessions. His health reflects your discipline, so be the best student to see your feline friend thrive! • Interactive Study Sessions: Initiate a new study session and immerse yourself in the colorful world of Fatty Cat! Feed him during breaks and earn coins for exclusive customizations. Complete all four bowls for a successful party and impeccable study routine! • Unique, Hand-Drawn Style: Enjoy an original and unique hand-drawn style with love. Fatty Cat boasts over 20 adorable animations to express his emotions. Interact with him through fun gestures and watch how he reacts to your actions! • Goals, Records, and Statistics: Challenge yourself to unlock secret goals, surpass your records, and monitor your weekly statistics to consistently improve your study routine. The Guinness Cat Record awaits to immortalize your achievements! • Immersive Mode and White Noise: Maximize your focus with the immersive mode and support for white noise. Eliminate distractions and fully immerse yourself in your studies with the help of your beloved Fatty Cat! • Limitless Customization: Unleash your creativity in the Shop, where you can customize not only Fatty Cat but also the entire app experience! Purchase new looks, delicious foods, and colorful backgrounds to make every study session unique and enjoyable. Prepare your study routine and make Fatty Cat your educational adventure companion. Download the app today and transform your study time into an irresistible experience!
Screenshots
Verdict
The clearest difference is ads: Fatty Cat! at none against iDay's shown. Fatty Cat! also leads on ratings volume (409 vs 71) and iOS requirement (12.0 vs 15.6). iDay's advantage is review sentiment (89% vs 75%). On price, rating, update cadence and in-app purchases 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
Both are free to download. iDay sells 1 one-off in-app purchase and Fatty Cat! sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for iDay against 4.8 for Fatty Cat!. That said, the two scores are not equally well evidenced: Fatty Cat! has 409 ratings behind it against 71, so its average is the more settled of the two. Written reviews are what separate them: 89% of iDay's written reviews are positive against 75% of Fatty Cat!'s.
iDay ships an update every 2 months, Fatty Cat! monthly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | iDay | Fatty Cat! |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (71 ratings) | 4.8 (409 ratings) — better |
| Positive reviews | 88.9% of reviews — better | 74.5% of reviews |
| Number of ratings | 71 | 409 — better |
| Update frequency | Every 2 months | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 63 MB | 207 MB |
| Age rating | 4+ | 4+ |
| Developer | 再锋 吴 | Michele Marrazzo |
Customer experience
iDay
Fatty Cat!
Bugs and requests
iDay
Not enough reviews yet to summarise bugs or requests.
Fatty Cat!
Reported bugs
12 issues- Timer alerts too short and can be missed
- Study time invalidated when exiting the app
- Cats dying unexpectedly without clear reason
- Lack of developer response to support emails
- Screen turns off if not touched during study session
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- Time zone issues causing sessions to be calculated to the next day
- Incorrect display of study time ('Error Time!')
- Discrepancies between bowls eaten and displayed
- Bluetooth speaker interaction failing study sessions
- Time pausing when phone is face down
- iPad version overriding iPhone data causing cat death
- Sound notifications not working when app is in background
Requested features
16 requests- Continue ringing/vibrating until stopped
- Stopwatch mode
- Widgets for data display
- Premium charts with color-coded study types
- Adjustable UI (black and white option)
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- More freedom in modifying study length (e.g., 50min minimum)
- Ability to feed cat more than four times a day
- Earn cat drawings over time instead of with premium
- Option to count excess time
- Daily reset for tracking
- More achievements
- Ability to navigate back to main screen and save current progress
- Premium content accessible to free users as rewards
- Multiple cats for different subjects
- Colored cats as premium option
- Language selection independent of system language
In-app purchases
iDay
- 高级会员$2.99
Fatty Cat!
- Coin Purse$0.99
- Coin Bag$2.99
- Fatty Cat! Premium$2.99
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- Coin Chest$4.99









