# BTZS ExpoDev vs DarkroomLog

The clearest difference is price: DarkroomLog at Free against BTZS ExpoDev's $24.99. DarkroomLog also leads on update cadence (every 3 weeks vs every 12 months). BTZS ExpoDev's advantage is iOS requirement (13.7 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

DarkroomLog is free to download; BTZS ExpoDev costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BTZS ExpoDev ships an update every 12 months, DarkroomLog every 3 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BTZS ExpoDev | DarkroomLog |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 16 MB | 14 MB |
| Requires iOS | **13.7** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TinyOctopus, LLC](https://appshunter.io/developer/507385773) | [Webitel](https://appshunter.io/developer/1608583785) |

## 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


### DarkroomLog

[App page](https://appshunter.io/ios/app/darkroomlog/id6761314118)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BTZS ExpoDev free?

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

### Is DarkroomLog free?

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

### Do BTZS ExpoDev or DarkroomLog have ads?

Neither BTZS ExpoDev nor DarkroomLog shows ads.

### Which is updated more often, BTZS ExpoDev or DarkroomLog?

BTZS ExpoDev ships an update every 12 months, and DarkroomLog every 3 weeks. Most recently, BTZS ExpoDev was updated on October 7, 2026 and DarkroomLog on October 25, 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.*