# f8 Lens Toolkit vs Kessler kOS

The clearest difference is review sentiment: f8 Lens Toolkit at 80% against Kessler kOS's 0%. f8 Lens Toolkit also leads on rating (4.9 vs 3.0) and ratings volume (26 vs 3). Kessler kOS's advantage is price (Free vs $9.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

Kessler kOS is free to download; f8 Lens Toolkit costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

f8 Lens Toolkit holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: f8 Lens Toolkit has 26 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 80% of f8 Lens Toolkit's written reviews are positive against 0% of Kessler kOS's.

f8 Lens Toolkit ships an update every 2 months, Kessler kOS every 3 months. The most recent releases landed on September 22, 2026 and July 18, 2026 respectively.

## The numbers

| Metric | f8 Lens Toolkit | Kessler kOS |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.9 (26 ratings)](https://appshunter.io/ios/app/f8-lens-toolkit/id887877435/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/kessler-kos/id1128523711/reviews) |
| Number of ratings | **26** | 3 |
| Positive reviews | **79.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | **Free** |
| Size | 4 MB | 38 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cadrage GmbH](https://appshunter.io/developer/793232743) | [Kessler Crane Inc.](https://appshunter.io/developer/529307950) |

## What reviewers say

### f8 Lens Toolkit

[App page](https://appshunter.io/ios/app/f8-lens-toolkit/id887877435)

This app provides photographers and cinematographers with essential tools for optical calculations. It offers features like depth of field calculation, field of view determination, and lens matching for various camera formats. It's designed to be an indispensable reference tool for professionals and students alike.

**Highlights:** Depth of Field & Hyperfocal Distance Calculator, Field of View Calculator, Lens Matcher: Equivalent Focal Length & F-Stop, Camera Sensor Comparison Tool, Lens Coverage Tool, Extensive camera and lens database, Supports anamorphic shooting and Speedboosters

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

**In-app purchases:** none


### Kessler kOS

[App page](https://appshunter.io/ios/app/kessler-kos/id1128523711)

This advanced software provides precise wireless control for professional camera motion systems. It enables users to create complex, repeatable camera movements for various video and photography applications through an intuitive interface.

**Highlights:** Ultra-refined keyframe control, Wireless iPad control, Timelapse and stop motion modes, Complex keyframe movement, Editable keyframes, Repeatable camera moves, Event mode for live scenarios

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

**In-app purchases:** none


## Frequently asked questions

### Is f8 Lens Toolkit free?

f8 Lens Toolkit costs $9.99, with no in-app purchases.

### Is Kessler kOS free?

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

### Which has better reviews, f8 Lens Toolkit or Kessler kOS?

f8 Lens Toolkit is rated higher. f8 Lens Toolkit averages 4.9 out of 5 from 26 ratings, while Kessler kOS averages 3.0 from 3 ratings.

### Do f8 Lens Toolkit or Kessler kOS have ads?

Neither f8 Lens Toolkit nor Kessler kOS shows ads.

### Which is updated more often, f8 Lens Toolkit or Kessler kOS?

f8 Lens Toolkit ships an update every 2 months, and Kessler kOS every 3 months. Most recently, f8 Lens Toolkit was updated on September 22, 2026 and Kessler kOS on July 18, 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.*