# FieldServiceOS vs Fill In Studio

The clearest difference is in-app purchases: Fill In Studio at none against FieldServiceOS's 1. Fill In Studio also leads on iOS requirement (14.0 vs 18.6). FieldServiceOS's advantage is update cadence (every 2 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. FieldServiceOS sells 1 in-app purchase, starting at $14.99 per month. Fill In Studio asks for nothing beyond the download.

FieldServiceOS ships an update every 2 days, Fill In Studio every 2 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | FieldServiceOS | Fill In Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fill-in-studio-class-manager/id6756318343/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 weeks |
| Monetization | — | Free |
| Size | 22 MB | 61 MB |
| Requires iOS | 18.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Aitor Recalde](https://appshunter.io/developer/1805666679) | [Fill In LLC](https://appshunter.io/developer/1846910963) |

## What reviewers say

### FieldServiceOS

[App page](https://appshunter.io/ios/app/fieldserviceos/id6755404926)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Monthly | $14.99 | per month |


### Fill In Studio

[App page](https://appshunter.io/ios/app/fill-in-studio-class-manager/id6756318343)

This app helps fitness studios and gyms fill empty class spots by connecting them with local clients seeking last-minute bookings. Easily post classes, create discounted deals, and manage all your bookings and payments securely.

**Highlights:** Studio dashboard for bookings and revenue, Post classes with details and photos, Create flash deals for last-minute openings, Manage class bookings and attendee lists, Secure Stripe Connect payouts, Instant notifications for new bookings

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

**In-app purchases:** none


## Frequently asked questions

### Is FieldServiceOS free?

FieldServiceOS is free to download, with in-app purchases available.

### Is Fill In Studio free?

Fill In Studio is free to download, with no in-app purchases.

### Do FieldServiceOS or Fill In Studio have ads?

Neither FieldServiceOS nor Fill In Studio shows ads.

### Which is updated more often, FieldServiceOS or Fill In Studio?

FieldServiceOS ships an update every 2 days, and Fill In Studio every 2 weeks. Most recently, FieldServiceOS was updated on October 30, 2026 and Fill In Studio on October 30, 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.*