# f vs Chronodev

The clearest difference is rating: Chronodev at 4.5 against f's 3.8. Chronodev also leads on review sentiment (100% vs 60%) and update cadence (monthly vs every 29 months). f's advantage is iOS requirement (9.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chronodev holds the better App Store score, 4.5 against 3.8. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 60% of f's written reviews are positive against 100% of Chronodev's.

f ships an update every 29 months, Chronodev monthly. The most recent releases landed on October 7, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | f | Chronodev |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (5 ratings)](https://appshunter.io/ios/app/f-stop-printing-calculator/id858392735/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/chronodev-darkroom-timer/id6478027671/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Monthly** |
| Monetization | Free | Free |
| Size | 1 MB | 2 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Freestyle Photo & Imaging](https://appshunter.io/developer/1786429988) | [Kevin Olmats](https://appshunter.io/developer/1480968856) |

## What reviewers say

### f

[App page](https://appshunter.io/ios/app/f-stop-printing-calculator/id858392735)

This app helps darkroom printers adjust exposure times by f-stop increments. It calculates precise exposure values for printing, offering easier test strip creation by working with equal exposure differences.

**Highlights:** Calculate exposure by f-stop increments, Modify exposure times for printing, Generate new exposure times, Calculate f-stop increments for burning in, Easier test strip creation

**Features:** macOS Compatibility, 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 f free?

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

### Is Chronodev free?

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

### Which has better reviews, f or Chronodev?

Chronodev is rated higher. f averages 3.8 out of 5 from 5 ratings, while Chronodev averages 4.5 from 2 ratings.

### Do f or Chronodev have ads?

Neither f nor Chronodev shows ads.

### Which is updated more often, f or Chronodev?

f ships an update every 29 months, and Chronodev monthly. Most recently, f was updated on October 7, 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.*