Letus Helix vs Kessler kOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Letus Helix
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.
- Intuitive settings adjustment
- Simplified configuration
- User assistance tools
- Wi-Fi connectivity
- Support for multiple Helix models
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The Letus Helix app is designed to be a simple and intuitive way of changing settings on the Letus Double Helix, Helix Pro, Standard Helix, and Helix Jr. Many settings from the SimpleBGC GUI (PC/Mac-based configuration program) have been eliminated, because those settings are only needed to work with other gimbals or are rarely used. Additional tools to help the user have been created to assist the user in their use of the Helix. Connection with the Helix is done as follows: 1) Turn the Helix on 2) Go to the Home screen on your iPhone/iPad. 3) Find Settings -> Wi-Fi and select your Letus Helix. 4) Enter the wifi password found in the app help files (found by pressing the info button on the app's main menu). 5) Once it connects in iOS, you can go to the app and press the connect button.
Kessler kOS
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.
- 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
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kOS is an advanced camera motion control software that unlocks the highest level of control and features for Kessler’s industry-leading motion control systems including Second Shooter Plus, Second Shooter Pro, and the newest motion control system CineShooter. This app allows for ultra-refined keyframe based control in a powerful and easy-to-use interface for applications such as timelapse, stop motion, live video/cinematography, event video, and advanced photography controlled wirelessly via iPad. CONTROL ANY MOTION Live, looping, stop motion, timelapse, GigaPixel* and Event Mode camera moves at your fingertips. DIGITAL KEYRAMING Simply move each axis into position and hit record. kOS saves your exact positioning for 100% repeatable moves. WIFI CONNECTIVITY Your CineShooter, Second Shooter Pro, or Second Shooter Plus device creates its own WiFi network that you can connect your device to instantly. COMPLEX KEYFRAME MOVEMENT Create up to 20 keyframes at once for ultra complex movement. EASY KEYFRAME SMOOTHING Add and manipulate curves to your moves for ease-in and ease-out motion. Also, link each side of the keyframe to match. EDITABLE KEYFRAMES No need to re-record the move if it's not exactly what you want. Edit one or all axes and keyframes into the perfect position. Featuring incremental, exact motor position plus tap and move keyframe adjustments. REPEATABILITY Repeat the exact same move over and over again at the same speed or variable speeds depending on the application. DELAY BY DATE/TIME Not going to be around when your move needs to start? No problem. Easily set a date/time or fixed amount of time to have your move begin. kOS takes care of the rest. FLASH MARK/BLOOP Sync up your moves easily via the built-in flash marks with adjustable delay. PRE & POST-PHOTOS (TIMELAPSE MODE) Easily add a series of head or tail photos to your timelapse move. GO TO POSITION Set minimum and maximum ranges on each axis (ie. slider 0" to 32") and go to any position by entering a value. LOAD & GO This feature allows for pre-loading a move so that you are able to start instantly whenever you are ready. CAMERA PRE and POST ROLL Trigger your camera to start recording any amount of time before the move begins and when to stop after the move ends. ANALOG CONTROL PANEL Manually control several axes live with the built in analog controller. EVENT MODE Event mode is mainly intended for live events or scenarios where exact position recalling on-the-fly is needed. For example, if you are filming a live concert, you can have different positions on stage saved. You can move easily from the drummer, to the guitarist, to the lead singer and so forth. This mode is also great for repeatedly hitting actor marks on set. GIGAPIXEL GigaPixel is traditionally used for 360 degree virtual tours, panoramic photographs or GigaPixel images which are extremely high resolution photographs that are compiled of many lower resolution photographs. GRAPH EXPANSION Expand the graph with one touch when precise key framing is needed. SCRUB THROUGH MOVE Need to edit a key frame or see when the camera will be in a certain position? Use the scrub feature to instantly move to a desired position. LOOPING Looping is made easy with kOS. Simply select one-time or continuous looping. CAMERA CONTROL Set CineShooter, Second Shooter Pro, Second Shooter Plus device to trigger or control your camera’s exposure time within kOS. AUTO TIMELAPSE CALCULATION Enter your desired clip length and frame rate, then kOS will calculate the run time needed. BUMP BUTTONS Move in very small increments to ensure a precise camera position. DROPBOX INTEGRATION Upload saved moves directly to your Dropbox account within kOS app. MOTOR CONFIGURATION Each axis is able to be customized with individual features such as run speed, dampening, smoothness of curves, bump button, and axis naming.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Letus Helix | Kessler kOS |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | 3.0 (3 ratings) |
| Positive reviews | 80.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 3 | 3 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 11.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 21 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Ken Lawler | Kessler Crane Inc. |
Customer experience
Letus Helix
Kessler kOS
In-app purchases
Letus Helix
No in-app purchases
Kessler kOS
No in-app purchases
Questions
Is Letus Helix free?
Is Kessler kOS free?
Which has better reviews, Letus Helix or Kessler kOS?
Do Letus Helix or Kessler kOS have ads?
Which is updated more often, Letus Helix or Kessler kOS?
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