Part of the Vulos OS suite

Cackle

Your gate works with no internet.

Cackle is events and ticketing in a single Go binary. Organisers create events and ticket types, attendees buy and get a signed QR, staff scan at the gate — and every ticket is an Ed25519-signed capability a scanner verifies entirely offline against a pinned event key. The server issues tickets and reports sales, but it is never in the critical path of admission. If the venue's network dies mid-event, the gates keep working.

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Cackle — organiser dashboard and offline gate scanner

Built for the gate that can't fail

Self-hostable, open source, and honest about the market it's for: festivals in a field, remote venues, and anywhere the network isn't guaranteed.

Offline-verifiable tickets

Every ticket is cackle.<payload>.<sig> — an Ed25519-signed capability verified by a pure function: no database, no network, no clock but the one you hand it.

The server isn't the gate

A scanner pulls one scan-bundle while online — event details, issuer keys, a ticket index — and can then run the whole event unplugged.

Per-event signing keys

Every event signs with its own Ed25519 key. There is no global signing key, ever — a compromised key compromises one event, not the platform.

Local, append-only dedupe

Admission dedupe happens on the device: first scan wins, duplicates are recorded as their own row — never overwritten, always auditable.

Pluggable payments

A small Provider seam behind every charge — ships with Paystack and an auto-settling stub for demos and tests. Cackle never holds funds.

Single binary

Go embeds SQLite (pure Go, no cgo) and the built React frontend into one file. docker run -p 8080:8080 vulos/cackle is the whole install.

Quick start

Zero setup, fully seeded, buy a ticket and scan it end to end.

git clone https://github.com/vul-os/cackle.git
cd cackle
docker build -t vulos/cackle .
docker run -d --name cackle -p 8080:8080 \
  -v cackle-data:/srv/data vulos/cackle

# or from source, fully seeded with demo data:
make build
./cackle --demo
# open http://localhost:8080

1
Run itDocker one-liner, or build the Go binary yourself — no external database, no Node process in production.
2
Try the demo--demo seeds an org, an event, ticket types, and an auto-settling payment provider — buy a ticket with zero setup.
3
Scan it, offlineOpen the scanner view, turn off your Wi-Fi, and admit the ticket anyway — that's the whole point.

Part of Vulos

Vulos is an open, self-hostable web OS and its owned apps. Cackle runs perfectly standalone — and embeds as a first-class app in the Vulos OS shell, alongside Office, Files, Relay, and llmux.

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