CoachAid - Review & Teach
Slow-mo review & comparison
$4.99 · Designed for iPad. Not verified for macOS.
Import or record clips, scrub frame-by-frame, draw and add text, compare side-by-side or transparent overlay, ball speed calculate. One-time purchase, no ads, no tricks.
CoachAid helps coaches and athletes review performance video on iPhone and iPad. It is a simple,
powerful, and completely private tool built to just work - one-time purchase, no subscriptions, no
ads.
RECORD OR IMPORT
Capture practice straight from the camera, or import existing videos from your photo library. Even
large videos come in with clear progress so you always know what is happening.
ORGANIZE YOUR LIBRARY
Keep source videos, trimmed clips, and saved comparisons together in one place. Tag anything, search
your whole library in seconds, and favorite the clips you use most.
ANALYZE WITH PRECISION
Scrub frame by frame, slow footage down to 0.1x, speed it up to 16x, and step one frame at a time to
catch the exact moment. Draw freehand, lines, arrows, rectangles, and circles, and add text directly
on the video to explain technique. Crop, zoom, and rotate to focus on what matters most.
MEASURE BALL SPEED
Use the built-in Ball Speed Calculator to mark start and end points on a clip and estimate speed for
tennis serves, baseball pitches, or custom distances. Save the measured result back onto the video
as an annotation for easy review and sharing.
COMPARE TWO CLIPS
Study two clips side by side, top and bottom, or in a transparent overlay so you can line up form
and timing frame by frame. Each clip keeps its own playback speed and scrub control.
EXPORT & SHARE
Save annotated snapshots and export comparison snapshots or videos when you are ready to share
feedback with an athlete or team.
PRIVATE BY DESIGN
Your library stays entirely on your device. No account, no sign-up, nothing uploaded.
Available in English, Simplified Chinese, Japanese, Korean, French, German, and Spanish.
Support: support@jinweijie.com
Privacy Policy: https://jinweijie.github.io/coachaid-site/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Speed Calculator — clearer results: Measured speed and optional TV/radar-style estimate are easier to read at a glance, with distance and time shown alongside the speeds.
Room to focus: You can collapse the speed result strip with the same drag-style control used when editing clips; tap again to expand. After you collapse it, setting new start and end points will automatically expand the strip when a new speed is ready.
Less clutter: Long calculation breakdowns are tucked under “Calculation details” until you need them.
Quicker annotation: Add the measured speed to the clip with a shorter “Add as Annotation” action.
Localization: New and updated strings for the speed result UI in supported languages.
The developer, 伟杰 金, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 伟杰 金
- Size
- 14.7 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Weijie Jin

