Comparison

RED Tools vs Kessler kOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RED Tools

This app assists filmmakers and camera operators with camera setup by providing tools for crop factor, recording time, flicker-free video, depth of field, panning speed, and exposure. It offers customizable settings for various shooting situations and RED camera systems.

Highlights
  • Crop factor preview
  • R3D recording time evaluation
  • Flicker-free video calculation
  • Depth of field estimation
  • Panning speed guidance
  • Exposure assistance
Features
Read full description

RED Tools is a convenient reference tool designed for use by filmmakers and camera operators to outline best practices in camera set-up for a variety of shooting situations. Each tool is customizable based on a selected RED camera and sensor type. Standard film formats are also included for comparison. RED Tools is also included in the RED Control app, which also provides free, full-featured camera control and video streaming for RED’s latest DSMC3 products. TOOLS INCLUDED: CROP FACTOR Preview how a given focal length will appear depending on resolution setting and sensor type. Illustration depicts viewable area relative to a traditional 35 mm stills photography sensor by default, but other reference sensors are selectable within the drop-down menu. R3D RECORDING TIME Evaluate the video data rate and available recording time based on your RED camera settings. This can help you understand media requirements and production costs in advance of a shoot. FLICKER FREE VIDEO Find a flicker-free shutter speed and frame rate combination when shooting under artificial lighting. DEPTH OF FIELD Understand how various camera settings influence depth of field. PANNING SPEED Estimate the panning speed where judder will likely become too pronounced. The goal is to provide a more accessible tool than the charts and tables commonly referenced in cinematography manuals. It uses the standard rule of thumb that camera panning should not cause objects to transit the entire horizontal extent of an image in any less than seven seconds. EXPOSURE Assist with exposure when one camera setting has to change. Example usage scenarios include when a higher frame rate needs to be used for slow motion, when the T-stop has to change for depth of field, or when the shutter angle has to change to minimize flickering in artificial light. NIKKOR Z Lens Coverage Use this tool to understand how NIKKOR Z lenses will look on your RED Z Mount camera bodies. The tool shows the extent the light will fall off at different sensor formats, and if any hard vignetting occurs.

About

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.

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
Read full description

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

RED Tools4 screens

Verdict

The call

The clearest difference is review sentiment: RED Tools at 50% against Kessler kOS's 0%. RED Tools also leads on rating (3.3 vs 3.0) and ratings volume (15 vs 3). Kessler kOS's advantage is update cadence (every 3 months vs every 21 months). On price, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

RED Tools holds the better App Store score, 3.3 against 3.0. That said, the two scores are not equally well evidenced: RED Tools has 15 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of RED Tools's written reviews are positive against 0% of Kessler kOS's.

UpkeepUpdate frequency

RED Tools ships an update every 21 months, Kessler kOS every 3 months. The most recent releases landed on September 19, 2026 and September 26, 2026 respectively.

Scorecard6 real differences · 4 level
RED Tools versus Kessler kOS: the parameters behind the verdict, then further details
ParameterRED ToolsKessler kOS
PriceFreeFree
Rating3.3 (15 ratings) — better3.0 (3 ratings)
Positive reviews50.0% of reviews — better0.0% of reviews
Number of ratings15 — better3
Update frequencyEvery 21 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS15.6 — better18.0
Further details — not scored
Size7 MB38 MB
Age rating4+4+
DeveloperRED Digital CinemaKessler Crane Inc.

Customer experience

RED Tools

All ratings13 ratings
Positive53.8%
Neutral7.7%
Negative38.5%
Written reviews18 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

Kessler kOS

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

RED Tools

No in-app purchases

None

Kessler kOS

No in-app purchases

Questions

Is RED Tools free?
RED Tools 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, RED Tools or Kessler kOS?
RED Tools is rated higher. RED Tools averages 3.3 out of 5 from 15 ratings, while Kessler kOS averages 3.0 from 3 ratings.
Do RED Tools or Kessler kOS have ads?
Neither RED Tools nor Kessler kOS shows ads.
Which is updated more often, RED Tools or Kessler kOS?
RED Tools ships an update every 21 months, and Kessler kOS every 3 months. Most recently, RED Tools was updated on September 19, 2026 and Kessler kOS on September 26, 2026.

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