# Letus Helix vs Kessler kOS

The clearest difference is review sentiment: Letus Helix at 80% against Kessler kOS's 0%. Letus Helix also leads on rating (3.7 vs 3.0) and device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

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

Letus Helix holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews point the same way: 80% of Letus Helix's written reviews are positive against 0% of Kessler kOS's.

Letus Helix ships an update every 4 months, Kessler kOS every 3 months. The most recent releases landed on October 10, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Letus Helix | Kessler kOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/letus-helix/id967348624/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/kessler-kos/id1128523711/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | **80.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 21 MB | 39 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ken Lawler](https://appshunter.io/developer/967348623) | [Kessler Crane Inc.](https://appshunter.io/developer/529307950) |

## What reviewers say

### Letus Helix

[App page](https://appshunter.io/ios/app/letus-helix/id967348624)

This app provides a streamlined interface for adjusting settings on various Letus Helix gimbal models. It simplifies configuration by removing less frequently used options found in desktop software, offering additional user assistance tools for easier operation.

**Highlights:** Intuitive settings adjustment, Simplified configuration, User assistance tools, Wi-Fi connectivity, Support for multiple Helix models

**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 Letus Helix free?

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

### Is Kessler kOS free?

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

### Which has better reviews, Letus Helix or Kessler kOS?

Letus Helix is rated higher. Letus Helix averages 3.7 out of 5 from 3 ratings, while Kessler kOS averages 3.0 from 3 ratings.

### Do Letus Helix or Kessler kOS have ads?

Neither Letus Helix nor Kessler kOS shows ads.

### Which is updated more often, Letus Helix or Kessler kOS?

Letus Helix ships an update every 4 months, and Kessler kOS every 3 months. Most recently, Letus Helix was updated on October 10, 2026 and Kessler kOS on October 12, 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.*