# PH System vs To Do Fusen

The clearest difference is update cadence: To Do Fusen at every 2 months against PH System's every 15 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PH System ships an update every 15 months, To Do Fusen every 2 months. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PH System | To Do Fusen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 25 MB | 2 MB |
| Requires iOS | **13** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [barnet Inc.](https://appshunter.io/developer/1203142034) | [Sparks & Company, Inc.](https://appshunter.io/developer/375894514) |

## What reviewers say

### PH System

[App page](https://appshunter.io/ios/app/ph-system/id1438705034)

**Features:** macOS Compatibility

**In-app purchases:** none


### To Do Fusen

[App page](https://appshunter.io/ios/app/to-do-fusen/id1528283624)

This app functions like a digital sticky note for managing your tasks. Easily add, organize, and customize notes with various colors. It offers helpful features like sorting, hiding completed items, and badge notifications for pending tasks.

**Highlights:** Add sticky notes, 6 color options, Sort sticky notes, Show/hide completed tasks, Badge notifications, Dark mode support, iCloud syncing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PH System free?

PH System is free to download, with no in-app purchases.

### Is To Do Fusen free?

To Do Fusen is free to download, with no in-app purchases.

### Do PH System or To Do Fusen have ads?

Neither PH System nor To Do Fusen shows ads.

### Which is updated more often, PH System or To Do Fusen?

PH System ships an update every 15 months, and To Do Fusen every 2 months. Most recently, PH System was updated on October 25, 2026 and To Do Fusen on November 3, 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.*