# Diary AI vs WillOS

The clearest difference is in-app purchases: Diary AI at none against WillOS's 7. Diary AI also leads on price ($0.99 vs $3.99). WillOS's advantage is update cadence (every 2 weeks vs every 16 months) and iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

Diary AI costs $0.99 and WillOS $3.99 up front. WillOS sells 5 one-off in-app purchases. Diary AI asks for nothing beyond the download.

Diary AI ships an update every 16 months, WillOS every 2 weeks. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Diary AI | WillOS |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 3 MB | 6 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Juiko Ong](https://appshunter.io/developer/639263890) | [艺景 张](https://appshunter.io/developer/1818288159) |

## What reviewers say

### Diary AI

[App page](https://appshunter.io/ios/app/diary-ai/id6532618062)

**Features:** macOS Compatibility

**In-app purchases:** none


### WillOS

[App page](https://appshunter.io/ios/app/willos/id6748278061)

This productivity tool helps users organize their time and prioritize tasks. It offers features to stay aware of time, focus on high-value activities, and manage tasks across multiple devices.

**Highlights:** Time awareness, Task prioritization, Cross-device task management, Organized time management

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wishing Well (人・ω・。) | $0.99 | one-time |
| Fuel me (//ω//) | $2.99 | one-time |
| Feed me (//ω//) | $4.99 | one-time |
| PRO | $6.99 | one-time |
| Feed me (//ω//) | $6.99 | one-time |


## Frequently asked questions

### Is Diary AI free?

Diary AI costs $0.99, with no in-app purchases.

### Is WillOS free?

WillOS costs $3.99, and also offers in-app purchases.

### Do Diary AI or WillOS have ads?

Neither Diary AI nor WillOS shows ads.

### Which is updated more often, Diary AI or WillOS?

Diary AI ships an update every 16 months, and WillOS every 2 weeks. Most recently, Diary AI was updated on October 14, 2026 and WillOS on October 9, 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.*