Cassini
Statistical Process Control
Control charts, not contracts.
A complete SPC platform you deploy on your own infrastructure. Variable, attribute, and short-run charts. Nelson rules, capability analysis, MQTT / Sparkplug B ingestion, and a 300-endpoint REST API — all in one open-core package. Own your quality data. No vendor lock-in. No per-seat pricing traps.
10+
Chart Types
8
Nelson Rules
300+
API Endpoints
4
RBAC Tiers
Every chart type. Every rule. No compromises.
Cassini ships a complete SPC engine — not a subset, not a starter kit. If your quality standard references it, Cassini supports it out of the box.
Variable Charts
X-bar & R, X-bar & S, Individuals & Moving Range for continuous measurement data. Plus CUSUM and EWMA for detecting small, sustained shifts that Shewhart charts miss.
Real-time via WebSocket
Attribute Charts
p, np, c, and u charts for defective/defect count data. Includes Laney p' and u' corrections for overdispersed data — the kind most SPC tools silently get wrong.
Overdispersion-corrected
Short-Run Charts
Deviation mode and Z-score standardization for low-volume and high-mix production. Chart multiple part numbers on a single control chart without waiting for 25 subgroups.
High-mix / low-volume ready
Nelson Rules
All 8 Nelson Rules, individually configurable per chart. Commercial edition adds preset management with Nelson, AIAG, WECO, and Wheeler rule sets for standardized configuration across your plant.
8 rules, individually configurable
Capability Analysis
Cp, Cpk, Pp, Ppk, and Cpm indices included in Community. Commercial edition adds non-normal distribution fitting with Box-Cox transformation and 6 distribution families for data that isn't normally distributed.
Non-normal fitting: commercial
Equipment Hierarchy
ISA-95 compliant structure: Enterprise, Site, Area, Line, Cell, Equipment. Organize charts, data, and permissions the way your plant actually operates — not the way a SaaS vendor decided to model it.
ISA-95 compliant
“Show Your Work”
Click any calculated value — a control limit, a capability index, a Nelson rule violation — and Cassini shows you exactly how it was computed. Step-by-step. With the formula rendered in KaTeX and citations to the relevant AIAG standard.
No more black-box SPC. When an auditor asks how your Cpk was calculated, you don't open a support ticket. You click the number.
This is the feature quality engineers wish every SPC tool had. Cassini is the one that actually built it.
UCL = X̄ + A₂ · R̄
X̄ = 23.4150
A₂ = 0.577 (n=5, AIAG Table VI-1)
R̄ = 2.3714
= 23.4150 + 0.577 × 2.3714
= 24.7832
Connect any data source.
From manual calipers to fully automated production lines, Cassini ingests data however it arrives.
MQTT / Sparkplug B
Subscribe to industrial IoT brokers and ingest measurement data in real time. Native Sparkplug B payload decoding for direct PLC integration. Community includes one broker; commercial unlocks unlimited.
OPC-UACOMMERCIAL
OPC-UA server management. Browse nodes, configure subscriptions, and map tags to SPC characteristics — all from the browser. Available with commercial license.
Gage BridgeCOMMERCIAL
RS-232 and USB serial connections to handheld gages, micrometers, and CMMs. Press the button on the gage, see it on the chart.
CSV / Excel Import
Guided import wizard with column mapping, validation rules, and preview. Migrate historical data or import batch records without writing code.
REST API
300+ endpoints covering every entity in the system. Build custom integrations, automate data collection, or feed Cassini from your MES, ERP, or LIMS.
Manual Entry
Touch-friendly data entry with input validation, spec limit enforcement, and operator prompts. Built for the factory floor, not the back office.
Deploy anywhere. Your servers, your rules.
Cassini runs where your data lives — on-premise, in a private cloud, or on a Raspberry Pi bolted to a machine. No phone-home. No cloud dependency.
Docker
Single-command deployment. Production-ready container images with health checks and volume persistence.
Multi-Database
SQLite for single-site. PostgreSQL, MySQL, or MSSQL for enterprise scale. Swap with a config change.
PWA + Offline
Install as a native app on any device. Full offline support for areas with unreliable connectivity.
Kiosk + Dashboard
Kiosk mode for factory floor terminals. Wall dashboard mode for control room displays. No mouse required.
Community vs Commercial
Community Edition is a full SPC platform — not a crippled demo. Commercial adds enterprise integrations, compliance modules, and support.
Community Edition
AGPL v3 · Free forever
- ✓X-bar & R, X-bar & S, I-MR, CUSUM, EWMA charts
- ✓p, np, c, u attribute charts with Laney overdispersion
- ✓Short-run charts (deviation & Z-score modes)
- ✓All 8 Nelson Rules
- ✓Capability analysis: Cp, Cpk, Pp, Ppk, Cpm
- ✓"Show Your Work" computation transparency
- ✓MQTT / Sparkplug B (single broker)
- ✓CSV / Excel import wizard
- ✓Manual data entry with validation
- ✓REST API (300+ endpoints)
- ✓SQLite database
- ✓RBAC (Operator, Supervisor, Engineer, Admin)
- ✓Complete audit trail
- ✓Real-time WebSocket updates
- ✓ISA-95 equipment hierarchy
- ✓Docker deployment
- ✓PWA with offline support
- ✓Kiosk mode for factory floor
- ✓AGPL v3 license
Commercial Edition
Everything in Community, plus:
- ✓OPC-UA server management and node browsing
- ✓Unlimited MQTT connections
- ✓RS-232 / USB gage bridge
- ✓MSA / Gage R&R (AIAG MSA 4th Edition)
- ✓First Article Inspection (AS9102 Rev C)
- ✓Design of Experiments (DOE)
- ✓Electronic signatures (21 CFR Part 11)
- ✓Non-normal distribution fitting (Box-Cox, 6-family)
- ✓Run rule preset management (Nelson, AIAG, WECO, Wheeler)
- ✓AI-powered chart analysis
- ✓Multivariate SPC (Hotelling T-squared, MEWMA)
- ✓Ishikawa (fishbone) root cause diagrams
- ✓Anomaly detection (ML-based)
- ✓Predictive analytics (ARIMA forecasting)
- ✓Push notifications for violations
- ✓ERP / MES integration
- ✓API key management
- ✓Data retention policies
- ✓PostgreSQL, MySQL, MSSQL support
- ✓Multi-plant / multi-site deployment
- ✓SSO / OIDC integration
- ✓Scheduled & automated reporting
- ✓Dedicated support with SLA
- ✓Proprietary modification rights
Get Started with Cassini
Deploy a complete SPC platform in minutes. Start with Community, upgrade when you need enterprise features.