# iDay vs Fatty Cat!

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.

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.

## The numbers

| Metric | iDay | Fatty Cat! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (71 ratings)](https://appshunter.io/ios/app/iday/id1458342824/reviews) | **[4.8 (409 ratings)](https://appshunter.io/ios/app/fatty-cat-study-companion/id1458862121/reviews)** |
| Number of ratings | 71 | **409** |
| Positive reviews | **88.9% of reviews** | 74.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 63 MB | 207 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [再锋 吴](https://appshunter.io/developer/1444700755) | [Michele Marrazzo](https://appshunter.io/developer/1458862120) |

## What reviewers say

### iDay

[App page](https://appshunter.io/ios/app/iday/id1458342824)

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.

**Highlights:** 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

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 高级会员 | $2.99 | one-time |


### Fatty Cat!

[App page](https://appshunter.io/ios/app/fatty-cat-study-companion/id1458862121)

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.

**Highlights:** Virtual cat study companion, Interactive study sessions, Customization shop, Goals and statistics tracking, Immersive mode, White noise support

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coin Purse | $0.99 | one-time |
| Coin Bag | $2.99 | one-time |
| Fatty Cat! Premium | $2.99 | one-time |
| Coin Chest | $4.99 | one-time |

**What reviewers like**

- 😻 Cute and adorable design
- 👍 Minimalist and user-friendly interface
- 🐈 Motivating to keep cat alive
- 📱 Effective phone locking for focus
- 💖 Interactive and engaging experience

**What reviewers complain about**

- 💰 Requires payment for full features
- 🔔 Timer alerts too short/unreliable
- ⏳ Study time invalidated on exit
- 💀 Cats die unexpectedly, causing demotivation
- 🚫 Lack of developer support for issues

**Reported bugs**

- 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

**Requested features**

- Continue ringing/vibrating until stopped
- Stopwatch mode
- Widgets for data display
- Premium charts with color-coded study types
- Adjustable UI (black and white option)


## Frequently asked questions

### Is iDay free?

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

### Is Fatty Cat! free?

Fatty Cat! is free to download, with in-app purchases available.

### Which has better reviews, iDay or Fatty Cat!?

Fatty Cat! is rated higher. iDay averages 4.7 out of 5 from 71 ratings, while Fatty Cat! averages 4.8 from 409 ratings.

### Do iDay or Fatty Cat! have ads?

iDay shows ads; Fatty Cat! does not.

### Which is updated more often, iDay or Fatty Cat!?

iDay ships an update every 2 months, and Fatty Cat! monthly. Most recently, iDay was updated on October 24, 2026 and Fatty Cat! on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*