Framecairn: CAN Decoder
Map Raw Frames & Signals
$1.99 · Designed for iPad. Not verified for macOS.
A pocket CAN workbench: type eight data bytes in hex and watch a 64-bit map, decoded signals, and bus-load sanity checks update instantly on one screen.
Framecairn is a pocket workbench for decoding CAN frame payloads and sanity-checking bus load — all on one fast screen.
Type eight data bytes in hex into the frame field and everything below updates instantly. A 64-bit map colors each bit by the signal that owns it, so you can see exactly where every field sits in the payload. The Decoded fixture section extracts the built-in signals — wheel speed, motor torque, and temperature — applying each one's start bit, length, factor, and offset to turn raw bits into physical values. The Bus budget section estimates utilization at 500 kbit/s: drag the frame-rate slider anywhere from 10 to 3,000 frames per second and watch the load bar, which turns red past 70%. An overlap check confirms the signal definitions never collide.
FEATURES
• Live hex payload decoding — results update as you type
• Color-coded 64-bit ownership map of the frame
• Factor/offset scaling from raw bits to physical values
• Bus-load estimator with bit-stuffing overhead built in
• Automatic signal-overlap detection
• Monospaced readouts and VoiceOver labels on every bit cell
PREMIUM BY DESIGN
One-time purchase. No account, no ads, no analytics, no tracking, and no network access — Framecairn works entirely offline.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Framecairn 1.1 is a focused redesign. The app now opens directly into a single fast CAN workbench: type eight payload bytes and watch the 64-bit ownership map and decoded signal values update live, then drag the frame-rate slider to estimate bus utilization at 500 kbit/s. Cleaner layout, monospaced readouts, and clearer overlap warnings throughout.
The developer, Robert Corbin, 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
- Robert Corbin
- Size
- 3 MB
- Category
- Developer Tools
- 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
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin
