Connect your analyzer
Capture live over WebUSB or drag in exported files from the bench.
USB-C PD protocol analyzer
Understand every PD capture before it reaches the lab bench.
Browser-based analysis for USB-C PD captures: live WebUSB capture, offline sqlite decoding, cloud sessions, expiring share links, AI troubleshooting, and printer-ready reports.
Capture library
Team workspace · Read-only preview
Recent captures
24
Charger validation runToday · 18m 42s · 1,284 packets
59.9 W
Cable identity checkYesterday · 04m 11s · SOP'
EPR
Thermal retry captureMay 31 · 22m 09s · 3 findings
PDF
PPS negotiation sweepMay 30 · 07m 58s · Team visible
PPS
Power profile
60s
Selected capture
PD 3.1
- Peak
- 59.9 W
- VBUS
- 19.84 V
- IBUS
- 3.02 A
- Share
- 7 days
0.142sSource_CapabilitiesSRC→SNK0.158sRequest · PPS 20VSNK→SRC0.171sPS_RDYSRC→SNK
AI verdict
3 findings
Negotiation is valid. One slow PS_RDY edge and two keep-alive timing warnings need review before customer handoff.
From capture to answer
A protocol review workflow that keeps the evidence intact.
Decode locally
PD, UFCS, VFCP, timing checks, and power graphs run in the browser.
Save and share
Reserve owner permalinks, share read-only links, and keep team context attached.
Export a report
Ship charging, troubleshooting, or charger spec sheets as print-ready PDFs.
The handoff problem
Stop losing context between scope traces, sqlite files, and chat threads.
Capture files get separated from the conclusion.
CANDYSIGN keeps decoded packets, annotations, reports, AI findings, and the source capture together.
Reviews depend on screenshots and memory.
Share the live session or printer-friendly report so firmware, QA, and customer teams inspect the same evidence.
Cloud tools can expose too much raw data.
Decode stays client-side; cloud storage is private by default and public links are read-only.
Live USB-C charging sessions
Plug in your analyzer, unlock high-speed capture, and watch VBUS, IBUS, CC, D+, and D− graph in real time as packets stream in.
PD, UFCS & VFCP decode
Read every PD message, UFCS frame, and VFCP exchange in clean, labeled fields with timing checks — not a wall of hex.
Open any capture file
Drop an exported .sqlite, .ufcsStream, or .csv and get the same graphs, packet list, decoder, report, and AI flow as a live session.
Save & share captures
Save captures to the cloud, reopen them anytime, and share read-only links that expire when you choose — your data stays private by default.
Compliance timing analysis
Flag hard resets, requests, GoodCRC timing, keep-alive behavior, and contract transitions while you review the packet log.
AI
Troubleshooting that starts from decoded evidence.
AI receives a compact, lint-aware session summary built from decoded packets, timing analysis, source caps, and your annotations. It does not need an opaque raw-file dump to explain the failure.
Verdict panel
3 findings
- PPS request accepted after a delayed PS_RDY transition.
- Cable identity is missing from this trace; annotate fixture before sharing.
- No compliance violation after the hard reset recovery window.
Reports
Three report formats for the way charger decisions actually happen.
Charging session
Characterize device, cable, charging profile, p25/p50/p75 power, energy, and temperature.
Troubleshooting
Share AI findings, compliance digest, setup metadata, source caps, graphs, and a live-session QR.
Charger spec sheet
Summarize fixed rails, PPS envelope, EPR support, negotiated contracts, delivered V/I, and cable identity.
Cloud and teams
Capture ownership stays clear even when the session travels.
Owner permalinks
Live captures reserve a private permalink at start and upload when the session stops.
Public share links
Create 1, 7, or 14 day read-only links for customer reviews and troubleshooting threads.
Enterprise domain teams
Verified domain users can join the right team automatically, with admin-managed access.
Usage dashboard
Track sessions, shares, token usage, and team access without leaving the analyzer.
Pricing
Start free. Scale when your lab does.
Free for individuals getting hands-on. Pro for teams who live in the lab. Enterprise for whole-domain rollouts with shared captures.
Free
$0
- Live capture & offline analysis
- Local reports & CSV export
- Cloud sessions & AI to get started
Most popular
Pro
Let's talk
- Higher AI & storage quotas
- Persistent session library
- Customer-facing share links
Enterprise
Custom
- Domain-based team membership
- Admin-managed read-only captures
- Deployment & quota coordination
Get analyzing