# Calibration Plus vs Chronodev

The clearest difference is review sentiment: Chronodev at 100% against Calibration Plus's 50%. Chronodev also leads on price (Free vs $2.99) and rating (4.5 vs 3.0). Calibration Plus's advantage is iOS requirement (15.6 vs 17.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Chronodev is free to download; Calibration Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Chronodev holds the better App Store score, 4.5 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 50% of Calibration Plus's written reviews are positive against 100% of Chronodev's.

Calibration Plus ships an update every 21 months, Chronodev monthly. The most recent releases landed on October 14, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Calibration Plus | Chronodev |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/calibration-plus/id1414916538/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/chronodev-darkroom-timer/id6478027671/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 14 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Le bord de la piscine](https://appshunter.io/developer/456593417) | [Kevin Olmats](https://appshunter.io/developer/1480968856) |

## What reviewers say

### Calibration Plus

[App page](https://appshunter.io/ios/app/calibration-plus/id1414916538)

This app aids in creating digital negatives for alternate process printing, offering fine tone control. It helps achieve better prints with improved dark, white, and halftone tones by designing correction curves. Generate reference charts and use image processing software to refine your digital negatives for perfect prints.

**Highlights:** Fine tone control for digital negatives, Correction curve design, Reference chart generation, Alternate process printing aid, Improved print quality

**Features:** Vision Pro support

**In-app purchases:** none


### Chronodev

[App page](https://appshunter.io/ios/app/chronodev-darkroom-timer/id6478027671)

This app transforms your iPhone or iPad into a darkroom enlarger timer. It uses HomeKit-enabled devices to control your enlarger and safelights, offering features like manual control, metronome for dodging/burning, and automatic test strip creation.

**Highlights:** iPhone/iPad enlarger timer, HomeKit device control, Manual enlarger focusing, Metronome for dodging/burning, EV stop time adjustments, Automatic test strip creation, Voice control support

**In-app purchases:** none


## Frequently asked questions

### Is Calibration Plus free?

Calibration Plus costs $2.99, with no in-app purchases.

### Is Chronodev free?

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

### Which has better reviews, Calibration Plus or Chronodev?

Chronodev is rated higher. Calibration Plus averages 3.0 out of 5 from 2 ratings, while Chronodev averages 4.5 from 2 ratings.

### Do Calibration Plus or Chronodev have ads?

Neither Calibration Plus nor Chronodev shows ads.

### Which is updated more often, Calibration Plus or Chronodev?

Calibration Plus ships an update every 21 months, and Chronodev monthly. Most recently, Calibration Plus was updated on October 14, 2026 and Chronodev on September 29, 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.*