# When vs Studio One Hundred

The clearest difference is update cadence: When at every 5 days against Studio One Hundred's every 9 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.

When ships an update every 5 days, Studio One Hundred every 9 months. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | When | Studio One Hundred |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 79 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ahmet Bahadr Eyubolu](https://appshunter.io/developer/1568892972) | [Styler Digital Limited](https://appshunter.io/developer/1506387468) |

## What reviewers say

### When

[App page](https://appshunter.io/ios/app/when-appointment-and-reminders/id6470170161)

Discover and book a variety of wellness services, from spa treatments to nail art. Compare studios and manage your self-care journey seamlessly. Businesses can also streamline their scheduling.

**Highlights:** Discover diverse wellness services, Book appointments effortlessly, Compare studios and services, Streamline business scheduling, Manage self-care journey

**Features:** macOS Compatibility

**In-app purchases:** none


### Studio One Hundred

[App page](https://appshunter.io/ios/app/studio-one-hundred/id6740181146)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is When free?

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

### Is Studio One Hundred free?

Studio One Hundred is free to download, with no in-app purchases.

### Do When or Studio One Hundred have ads?

Neither When nor Studio One Hundred shows ads.

### Which is updated more often, When or Studio One Hundred?

When ships an update every 5 days, and Studio One Hundred every 9 months. Most recently, When was updated on October 16, 2026 and Studio One Hundred 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.*