# Darkroom Formulas vs Reciprocity Plus

The clearest difference is review sentiment: Reciprocity Plus at 73% against Darkroom Formulas's 29%. Reciprocity Plus also leads on rating (4.1 vs 2.5) and price ($1.99 vs $5.99). Darkroom Formulas's advantage is iOS requirement (9.0 vs 15.6). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Darkroom Formulas costs $5.99 and Reciprocity Plus $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Reciprocity Plus holds the better App Store score, 4.1 against 2.5. Both are backed by a comparable volume of ratings — 4 and 7 respectively. Written reviews point the same way: 29% of Darkroom Formulas's written reviews are positive against 73% of Reciprocity Plus's.

Darkroom Formulas ships an update every 14 months, Reciprocity Plus every 4 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Darkroom Formulas | Reciprocity Plus |
| --- | --- | --- |
| Price | $5.99 | **$1.99** |
| Rating | [2.5 (4 ratings)](https://appshunter.io/ios/app/darkroom-formulas/id807461207/reviews) | **[4.1 (7 ratings)](https://appshunter.io/ios/app/reciprocity-plus/id898649178/reviews)** |
| Number of ratings | 4 | **7** |
| Positive reviews | 28.6% of reviews | **72.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#199** |
| Size | 2 MB | 8 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Freestyle Photo & Imaging](https://appshunter.io/developer/1786429988) | [Le bord de la piscine](https://appshunter.io/developer/456593417) |

## What reviewers say

### 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


### Reciprocity Plus

[App page](https://appshunter.io/ios/app/reciprocity-plus/id898649178)

**Currently charting:** #199 Top Paid · Photo & Video (US App Store)

This app simplifies long exposure photography calculations for both digital and analog cameras. It includes a vast library of filter effects and reciprocity charts, allowing users to design or modify their own. A built-in timer ensures accurate exposure timing even when the app is not in use.

**Highlights:** Long exposure calculation, 29 filter effects (CTO, CTB, ND, etc.), 110+ reciprocity charts, Customizable chart design, Built-in timer, Support for digital and analog photography

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Darkroom Formulas free?

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

### Is Reciprocity Plus free?

Reciprocity Plus costs $1.99, with no in-app purchases.

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

Reciprocity Plus is rated higher. Darkroom Formulas averages 2.5 out of 5 from 4 ratings, while Reciprocity Plus averages 4.1 from 7 ratings.

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

Neither Darkroom Formulas nor Reciprocity Plus shows ads.

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

Darkroom Formulas ships an update every 14 months, and Reciprocity Plus every 4 months. Most recently, Darkroom Formulas was updated on October 7, 2026 and Reciprocity Plus on October 14, 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.*