# 三省 vs Watermelon

The clearest difference is update cadence: Watermelon at every 4 days against 三省's every 6 months. On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 三省 sells 3 in-app purchases, starting at $2.99 per month and Watermelon sells 4 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for 三省 against 5.0 for Watermelon. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

三省 ships an update every 6 months, Watermelon every 4 days. The most recent releases landed on August 11, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | 三省 | Watermelon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/id6470999911/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/watermelon-ai-sticky-notes/id6742135426/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 30 MB | 509 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [嘉达 黄](https://appshunter.io/developer/1708566399) | [Feiou Su](https://appshunter.io/developer/1763231533) |

## What reviewers say

### 三省

[App page](https://appshunter.io/ios/app/id6470999911)

This cognitive tool uses cards for recording, reviewing, and self-dialogue to aid memory and clear thinking. It offers flexible input methods, knowledge networking, and visual mind mapping to enhance understanding and reflection.

**Highlights:** Card input (typing & handwriting), Bidirectional knowledge linking, Visual mind maps, Self-dialogue mechanism, Spaced repetition review, Cognitive graph building

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThreeTimes - Monthly Plan | $2.99 | per month |
| ThreeTimes - Yearly Plan | $4.99 | per year |
| ThreeTimes - Lifetime Plan | $9.99 | one-time |


### Watermelon

[App page](https://appshunter.io/ios/app/watermelon-ai-sticky-notes/id6742135426)

This app transforms spoken thoughts into organized tasks, projects, and plans. It automatically breaks down goals, tracks progress beyond simple completion, and offers various views for daily planning and reflection. It's designed for users who think faster than they can type.

**Highlights:** Voice-to-task capture, AI-powered task breakdown, Multiple progress tracking types, Daily and project planning views, Calendar diary for notes and moments, Home screen widgets, On-device transcription for privacy

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud AI Monthly | $5.99 | per month |
| Watermelon Unlimited Annual | $29.99 | per year |
| 200 Cloud AI credits | $2.99 | one-time |
| Watermelon Unlimited Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is 三省 free?

三省 is free to download, with in-app purchases available.

### Is Watermelon free?

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

### Which has better reviews, 三省 or Watermelon?

三省 and Watermelon are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.

### Do 三省 or Watermelon have ads?

Neither 三省 nor Watermelon shows ads.

### Which is updated more often, 三省 or Watermelon?

三省 ships an update every 6 months, and Watermelon every 4 days. Most recently, 三省 was updated on August 11, 2026 and Watermelon on September 15, 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.*