# X Sim Lab vs LightCalc.io

The clearest difference is price: LightCalc.io at Free against X Sim Lab's $17.99. X Sim Lab's advantage is in-app purchases (none vs 1) and iOS requirement (16.4 vs 18.0). On update cadence, ads and device support there is nothing between them.

LightCalc.io is free to download; X Sim Lab costs $17.99 up front. LightCalc.io sells 1 in-app purchase, starting at $34.99 per year. X Sim Lab asks for nothing beyond the download.

X Sim Lab ships an update every 3 weeks, LightCalc.io monthly. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | X Sim Lab | LightCalc.io |
| --- | --- | --- |
| Price | $17.99 | **Free** |
| Rating | **[3.5 (2 ratings)](https://appshunter.io/ios/app/x-sim-lab/id6761675489/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Paid | — |
| Size | 65 MB | 48 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Pangerl](https://appshunter.io/developer/1762982177) | [Matthias Streicher-Feldhofer](https://appshunter.io/developer/1896729345) |

## What reviewers say

### X Sim Lab

[App page](https://appshunter.io/ios/app/x-sim-lab/id6761675489)

Develop RAF files from Fujifilm X Series cameras using custom film simulation recipes directly on your iPad. This app allows you to import files, apply in-camera processing, manage recipes, and export JPEGs without needing a desktop computer.

**Highlights:** Develop Fujifilm RAF files, Apply custom film simulation recipes, In-camera processing, Manage recipe collection, Crop and export as JPEG, iPad-only workflow

**Features:** macOS Compatibility

**In-app purchases:** none


### LightCalc.io

[App page](https://appshunter.io/ios/app/lightcalcio/id6770274311)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LightCalc Plus | $34.99 | per year |


## Frequently asked questions

### Is X Sim Lab free?

X Sim Lab costs $17.99, with no in-app purchases.

### Is LightCalc.io free?

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

### Do X Sim Lab or LightCalc.io have ads?

Neither X Sim Lab nor LightCalc.io shows ads.

### Which is updated more often, X Sim Lab or LightCalc.io?

X Sim Lab ships an update every 3 weeks, and LightCalc.io monthly. Most recently, X Sim Lab was updated on October 7, 2026 and LightCalc.io on October 1, 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.*