# FILLIT the Abstract Strategy vs f(x)

The clearest difference is in-app purchases: f(x) at none against FILLIT the Abstract Strategy's 10. f(x) also leads on ads (none vs shown). FILLIT the Abstract Strategy's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. FILLIT the Abstract Strategy sells 10 one-off in-app purchases. f(x) asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 10, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | FILLIT the Abstract Strategy | f(x) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | Monthly |
| Size | 188 MB | 77 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [radiuthree Co., Ltd](https://appshunter.io/developer/1158448737) | [Ryo Matsumoto](https://appshunter.io/developer/1725054568) |

## What reviewers say

### FILLIT the Abstract Strategy

[App page](https://appshunter.io/ios/app/fillit-the-abstract-strategy/id1448147446)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Skin: NightPool(R+B) | $0.99 | one-time |
| Skin: NightPool(Y+G) | $0.99 | one-time |
| Remove Ads | $2.99 | one-time |
| Children's day(Y+G) | $2.99 | one-time |
| Rainy Season(R+B) | $2.99 | one-time |
| Rainy Season(Y+G) | $2.99 | one-time |
| Skin: Tanabata(R+B) | $2.99 | one-time |
| Skin: Tanabata(Y+G) | $2.99 | one-time |
| Skin: Tropical Resort(R+B) | $2.99 | one-time |
| Skin: Tropical Resort(Y+G) | $2.99 | one-time |


### f(x)

[App page](https://appshunter.io/ios/app/fx/id6475749250)

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

**In-app purchases:** none


## Frequently asked questions

### Is FILLIT the Abstract Strategy free?

FILLIT the Abstract Strategy is free to download, with in-app purchases available.

### Is f(x) free?

f(x) is free to download, with no in-app purchases.

### Do FILLIT the Abstract Strategy or f(x) have ads?

FILLIT the Abstract Strategy shows ads; f(x) does not.

### Which is updated more often, FILLIT the Abstract Strategy or f(x)?

FILLIT the Abstract Strategy ships an update monthly, and f(x) monthly. Most recently, FILLIT the Abstract Strategy was updated on October 10, 2026 and f(x) on October 11, 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.*