# BTZS ExpoDev vs Darkroom Assistant

The clearest difference is price: Darkroom Assistant at Free against BTZS ExpoDev's $24.99. Darkroom Assistant also leads on update cadence (every 4 days vs every 12 months). BTZS ExpoDev's advantage is in-app purchases (none vs 1) and iOS requirement (13.7 vs 15.1). On ads and device support there is nothing between them.

Darkroom Assistant is free to download; BTZS ExpoDev costs $24.99 up front. Darkroom Assistant sells 1 in-app purchase, starting at $39.99 per year. BTZS ExpoDev asks for nothing beyond the download.

BTZS ExpoDev ships an update every 12 months, Darkroom Assistant every 4 days. The most recent releases landed on October 7, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | BTZS ExpoDev | Darkroom Assistant |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/btzs-expodev/id507385770/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 days** |
| Monetization | Paid | — |
| Size | 16 MB | 54 MB |
| Requires iOS | **13.7** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TinyOctopus, LLC](https://appshunter.io/developer/507385773) | [Distinction Photo LLC](https://appshunter.io/developer/1868141640) |

## What reviewers say

### BTZS ExpoDev

[App page](https://appshunter.io/ios/app/btzs-expodev/id507385770)

This app helps traditional film photographers accurately expose black and white film using custom film test data. It calculates precise exposures and development times in the field for consistent results and easier darkroom printing.

**Highlights:** Exposure record keeping, Film Profile, lens, and filter management, Incident and Zone System metering support, Depth of Field calculator, Reciprocity failure adjustments, Integrated exposure timer

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

**In-app purchases:** none


### Darkroom Assistant

[App page](https://appshunter.io/ios/app/darkroom-assistant/id6757661002)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Darkroom Assistant Standard | $39.99 | per year |


## Frequently asked questions

### Is BTZS ExpoDev free?

BTZS ExpoDev costs $24.99, with no in-app purchases.

### Is Darkroom Assistant free?

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

### Do BTZS ExpoDev or Darkroom Assistant have ads?

Neither BTZS ExpoDev nor Darkroom Assistant shows ads.

### Which is updated more often, BTZS ExpoDev or Darkroom Assistant?

BTZS ExpoDev ships an update every 12 months, and Darkroom Assistant every 4 days. Most recently, BTZS ExpoDev was updated on October 7, 2026 and Darkroom Assistant on September 27, 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.*