# Reciprocity Timer vs Darkroom Formulas

The clearest difference is in-app purchases: Darkroom Formulas at none against Reciprocity Timer's 1. Darkroom Formulas also leads on iOS requirement (9.0 vs 12.0). Reciprocity Timer's advantage is update cadence (every 2 months vs every 14 months) and price ($1.99 vs $5.99). On rating, review sentiment, ratings volume and ads there is nothing between them.

Reciprocity Timer costs $1.99 and Darkroom Formulas $5.99 up front. Reciprocity Timer sells 1 one-off in-app purchase. Darkroom Formulas asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 2.5 for Reciprocity Timer against 2.5 for Darkroom Formulas. Both are backed by a comparable volume of ratings — 4 and 4 respectively. Written reviews are what separate them: 33% of Reciprocity Timer's written reviews are positive against 29% of Darkroom Formulas's.

Reciprocity Timer ships an update every 2 months, Darkroom Formulas every 14 months. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Reciprocity Timer | Darkroom Formulas |
| --- | --- | --- |
| Price | **$1.99** | $5.99 |
| Rating | [2.5 (4 ratings)](https://appshunter.io/ios/app/reciprocity-timer/id459691262/reviews) | [2.5 (4 ratings)](https://appshunter.io/ios/app/darkroom-formulas/id807461207/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | **33.3% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 28 MB | 2 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pump Interactive](https://appshunter.io/developer/459691265) | [Freestyle Photo & Imaging](https://appshunter.io/developer/1786429988) |

## What reviewers say

### Reciprocity Timer

[App page](https://appshunter.io/ios/app/reciprocity-timer/id459691262)

This app helps film photographers calculate exposure compensation for reciprocity failure. It offers a standard version for basic calculations and a pro version with advanced features like note-taking and custom film databases. It also includes an exposure timer and filter compensation tools.

**Highlights:** Reciprocity compensation calculations, Exposure timer, Filter compensation slider, Note-keeping feature, Custom film and camera databases, Film stock favorites

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reciprocity Timer Pro | $9.99 | one-time |


### Darkroom Formulas

[App page](https://appshunter.io/ios/app/darkroom-formulas/id807461207)

This app provides a digital cookbook of over 160 chemical formulas for darkroom photography. It features a volume mixer for easy proportional adjustments and allows users to save, edit, and share their own recipes. Access all data offline, making it a convenient tool for photographers.

**Highlights:** 160+ chemical formulas, Custom formula editing, Proportional volume mixer, Offline access, Formula export and backup, Supports multiple units

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

**In-app purchases:** none


## Frequently asked questions

### Is Reciprocity Timer free?

Reciprocity Timer costs $1.99, and also offers in-app purchases.

### Is Darkroom Formulas free?

Darkroom Formulas costs $5.99, with no in-app purchases.

### Which has better reviews, Reciprocity Timer or Darkroom Formulas?

Reciprocity Timer and Darkroom Formulas are both rated 2.5 out of 5 on the App Store, from 4 and 4 ratings respectively.

### Do Reciprocity Timer or Darkroom Formulas have ads?

Neither Reciprocity Timer nor Darkroom Formulas shows ads.

### Which is updated more often, Reciprocity Timer or Darkroom Formulas?

Reciprocity Timer ships an update every 2 months, and Darkroom Formulas every 14 months. Most recently, Reciprocity Timer was updated on October 13, 2026 and Darkroom Formulas on October 7, 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.*