SPC that proves its math.Deploy today. Own forever.
Control charts, capability analysis, and Nelson rules — with Cassini. Serialization with Ephemeris. Self-hosted. Source-available. No per-seat fees.
Cassini
Statistical Process Control
Every calculation auditable. Every chart explainable.
Click any statistical value to see the formula, intermediate steps, and AIAG citation. No black boxes. No support tickets.
SPC Engine
Every chart type. Every rule.
X-bar & R, I-MR, CUSUM, EWMA, p, np, c, u. All 8 Nelson rules evaluated on every sample. Short-run SPC with Laney correction for low-volume production.
Transparency
Click any value. See the math.
Show Your Work mode underlines every statistical value. Click to see the formula, intermediate steps, and AIAG citation. Built for auditors.
Capability
Cp, Cpk, Pp, Ppk, Cpm.
Capability indices with full computation traceability. Box-Cox transformation for non-normal distributions. Subgroup and individual measurement modes.
Infrastructure
Your servers. Your database.
Docker deployment in minutes. SQLite, PostgreSQL, MySQL, or MSSQL — switch anytime. MQTT / Sparkplug B connectivity included. 300+ REST API endpoints.
Why manufacturers switch
Legacy SPC tools charge per-seat, lock your data in proprietary formats, and require vendor consultants to configure. Saturnis is the alternative.
No per-seat licensing
Deploy to your entire plant. One license covers unlimited users.
Your data, your database
SQLite, PostgreSQL, MySQL, or MSSQL. Switch anytime. Export everything.
Show Your Work
Click any statistical value to see the formula, intermediate steps, and AIAG citation. Built for auditors.
From shop floor to dashboard
MQTT / Sparkplug B connectivity included free. OPC-UA and RS-232 gage bridges with commercial license.
Free forever. Pay when you need more.
Cassini ships as fully-functional open-source software under AGPL v3. Commercial licenses unlock enterprise integrations, compliance features, and dedicated support.
Community Edition
Free foreverAGPL v3
- ▷Full SPC engine with all chart types
- ▷All 8 Nelson rules
- ▷Capability analysis (Cp, Cpk, Pp, Ppk)
- ▷CUSUM & EWMA analysis
- ▷MQTT / Sparkplug B connectivity (single broker)
- ▷ISA-95 equipment hierarchy
- ▷REST API (300+ endpoints)
- ▷Show Your Work computation transparency
- ▷Deploy on your infrastructure
- ▷Community support via GitHub
Commercial License
$299 / site / month
- ▷Everything in Community, plus:
- ▷OPC-UA connectivity
- ▷Unlimited MQTT connections
- ▷RS-232 / USB gage integration
- ▷MSA / Gage R&R studies
- ▷First Article Inspection (AS9102)
- ▷Electronic signatures (21 CFR Part 11)
- ▷Anomaly detection (ML-based)
- ▷AI-powered chart analysis
- ▷Multivariate SPC (T-squared, MEWMA)
- ▷Multi-plant management
- ▷SSO / OIDC authentication
- ▷Scheduled reporting & export
- ▷Dedicated support with SLA
- ▷Proprietary modification rights
Built for regulated environments
Audit the Source
Every line of code is public. Review the SPC engine, Nelson rule implementations, and data handling yourself.
Your Infrastructure
Deploy on-premise or in your private cloud. Your quality data never leaves your network.
Standards-Based
ISA-95 equipment hierarchy, AIAG SPC methodology, AS9102 inspection reports.
Compliance-Ready
21 CFR Part 11 electronic signatures, complete audit trails, data retention policies.
No Vendor Lock-in
AGPL-licensed core. Switch databases, export data, fork the code. You're never trapped.
Enterprise Support
Commercial licenses include SLA-backed support, priority fixes, and dedicated engineering.
Deploy in minutes. Own it forever.
One command to a production-ready SPC system on your infrastructure.
$ docker compose up -dNo credit card required. AGPL v3 licensed.