# Framecairn: CAN Decoder — Map Raw Frames & Signals

> Map Raw Frames & Signals (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/framecairn-can-decoder/id6792495586 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Developer Tools, Utilities
- Price: $1.99 (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English
- Released: 2026-07-29
- Data updated: 2026-09-09
- User reviews in markdown: https://appshunter.io/ios/app/framecairn-can-decoder/id6792495586/reviews.md

## What is Framecairn?

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.


## Version history (last 2 releases)

### 1.1 — 2026-08-31

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.

### 1.0 — 2026-07-29

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*