Build reliability block diagrams in the browser

Every structure you actually use

Series and parallel, k-of-n voting groups, standby redundancy with its own standby life model, and nested sub-systems so a "pump skid" block can itself be a diagram. The canvas validates as you build — dangling blocks and impossible k-of-n configurations are flagged before you compute, not after.

Blocks backed by fitted models, not typed-in numbers

Each block links to a life model fitted from your own failure data — Weibull, Lognormal, Gamma, proportional hazards — rather than a reliability number typed in from a datasheet. When you refit a model with new data, every diagram that uses it reflects the update. Mixed time units across blocks are detected and flagged.

Outputs that point at the fix

System reliability over time, system MTTF, and minimal path and cut sets. Birnbaum and Fussell-Vesely importance rank which component is actually driving system unreliability — the difference between "improve something" and "improve bearing B, it accounts for most of the risk."

In the browser, shareable by link

Diagrams live in the cloud: no licence dongle, nothing to install, and a diagram can be shared view-only with anyone — the models its blocks reference come along automatically. Teams edit in a shared workspace. Self-host the open-source core if your system designs can't leave the building. New to the method? Start with the MTBF vs MTTF primer or the built-in sample diagram.