# FlexibleGrouping vs ホイッスル

The clearest difference is in-app purchases: FlexibleGrouping at none against ホイッスル's 2. FlexibleGrouping also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. ホイッスル sells 2 in-app purchases, starting at $1.99 per month. FlexibleGrouping asks for nothing beyond the download.

FlexibleGrouping ships an update fortnightly, ホイッスル every 10 days. The most recent releases landed on September 8, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | FlexibleGrouping | ホイッスル |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 28 MB | 14 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Daiki Hirao](https://appshunter.io/developer/1480092196) | [Naoki Yahata](https://appshunter.io/developer/1590150102) |

## What reviewers say

### FlexibleGrouping

[App page](https://appshunter.io/ios/app/flexiblegrouping/id1492907581)

**Features:** macOS Compatibility

**In-app purchases:** none


### ホイッスル

[App page](https://appshunter.io/ios/app/id6447121017)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $1.99 | per month |
| プレミアムプラン | $5.99 | per year |


## Frequently asked questions

### Is FlexibleGrouping free?

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

### Is ホイッスル free?

ホイッスル is free to download, with in-app purchases available.

### Do FlexibleGrouping or ホイッスル have ads?

ホイッスル shows ads; FlexibleGrouping does not.

### Which is updated more often, FlexibleGrouping or ホイッスル?

FlexibleGrouping ships an update fortnightly, and ホイッスル every 10 days. Most recently, FlexibleGrouping was updated on September 8, 2026 and ホイッスル on September 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.*