# Scientific Timer vs WillOS

The clearest difference is in-app purchases: Scientific Timer at none against WillOS's 4. Scientific Timer also leads on price ($0.99 vs $3.99). WillOS's advantage is update cadence (every 2 weeks vs every 16 months) and device support (3 vs 1). On ads there is nothing between them.

Scientific Timer costs $0.99 and WillOS $3.99 up front. WillOS sells 4 one-off in-app purchases. Scientific Timer asks for nothing beyond the download.

Scientific Timer ships an update every 16 months, WillOS every 2 weeks. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Scientific Timer | 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 | 8 MB | 6 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephane Boutet](https://appshunter.io/developer/1794014850) | [艺景 张](https://appshunter.io/developer/1818288159) |

## What reviewers say

### Scientific Timer

[App page](https://appshunter.io/ios/app/scientific-timer/id6741395405)

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

**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 (4)**

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


## Frequently asked questions

### Is Scientific Timer free?

Scientific Timer costs $0.99, with no in-app purchases.

### Is WillOS free?

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

### Do Scientific Timer or WillOS have ads?

Neither Scientific Timer nor WillOS shows ads.

### Which is updated more often, Scientific Timer or WillOS?

Scientific Timer ships an update every 16 months, and WillOS every 2 weeks. Most recently, Scientific Timer was updated on November 8, 2026 and WillOS on November 5, 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.*