A browser-based Isograph alternative
Isograph Reliability Workbench is a broad desktop suite covering many reliability methods. Ramly does one of them — the RBD RAM study, by simulation and an exact analytical (Markov) solver — in the browser, with nothing to install.
Isograph Reliability Workbench is a comprehensive Windows desktop suite: its reliability block diagram module sits alongside Fault Tree, FMECA, Event Tree, Reliability Prediction and Weibull analysis. If you need many analysis types in one package, it is wide-ranging.
Ramlyis the opposite shape: one focused job — the RBD RAM study — done in the browser with no install and no procurement. It covers both routes Isograph’s RBD module does — Monte Carlo simulation and an exact analytical (Markov/CTMC) solver, including multi-state partial-capacity components. For the availability question specifically, Ramly is faster to start, share and reproduce. For FMECA, fault-tree or prediction work, Isograph does things Ramly doesn’t set out to do.
Feature comparison
| Ramly | Isograph | |
|---|---|---|
| Deployment | Runs in any modern browser — nothing to install, on macOS, Windows or Linux. | Windows desktop suite (Reliability Workbench), installed per machine. |
| Getting started | Sign up and open a worked example model in minutes. | Per-seat license, typically quoted and procured. |
| Core method | Reliability block diagrams, evaluated both by discrete-event Monte Carlo simulation and by an exact analytical (Markov/CTMC) solver. | Reliability block diagram module, evaluated analytically and by simulation. |
| Distributions | Exponential, Weibull, normal, lognormal, uniform, triangular, constant. | Broad distribution library. |
| Redundancy & standby | k-of-n parallel; cold/warm standby with a separate dormant failure rate. | k-of-n and standby configurations. |
| Maintenance realism | Preventive maintenance, logistics delay, shared crews with queuing, spare pools with stock-outs. | Maintenance, spares and crew modelling. |
| Common-cause failures | Beta-factor CCF groups. | Supported. |
| Hidden failures & proof testing | Dormant failures revealed by inspection or on demand; per-component or per-mode; reports mean time undetected and PFDavg. | Inspection/proof-test intervals and PFD via its availability & safety (FMEDA/SIL) modules. |
| Production / throughput | Real-unit throughput capacity → production availability and lost production in t/h. | Availability and downtime outputs. |
| Importance & sensitivity | Birnbaum, RAW and RRW importance, plus ±20% MTTF/MTTR sensitivity. | Importance measures. |
| Analytical & Markov solver | Exact closed-form RBD algebra plus Markov (CTMC) for standby, common-cause and multi-state — with time-dependent A(t), R(t) and MTTF. | Analytical prediction plus a dedicated Markov module. |
| Multi-state / partial capacity | Multi-state components with per-state capacity, solved analytically for production availability. | Supported in the Markov / availability modules. |
| Other analyses | Not offered — Ramly is RBD-focused. | Dedicated Fault Tree, FMECA, Event Tree and Reliability Prediction (e.g. MIL-217 / 217Plus) modules. |
| Automation | Python API (libram.so) for scripted, repeatable runs. | API / automation interfaces. |
| Reproducibility | Fix the random seed and any reviewer re-runs to an identical result. | Seedable simulation. |
| Pricing | Subscription, published pricing — below most corporate card thresholds. | Per-seat license, quote-based. |
The comparison focuses on Isograph’s RBD module — the closest counterpart to Ramly. Reliability Workbench bundles several other analysis types listed above.
Which one should you use?
Choose Ramly when…
- ▸You specifically need the RBD availability study — fast, in the browser, no install or PO.
- ▸Your team is on mixed OSes and wants reproducible seeded runs plus a Python API.
- ▸You want operational and production availability with realistic maintenance and spares.
- ▸A subscription fits better than a per-seat desktop license.
Choose Isograph when…
- ▸You need FMECA, fault tree analysis, event trees or reliability prediction (MIL-217 / 217Plus) alongside RBD.
- ▸You want one integrated desktop suite spanning many reliability methods.
- ▸Your organisation is standardised on Isograph Reliability Workbench.
Try a real RAM study in your browser
No install, no procurement. Open a worked example model, run a Monte Carlo simulation and read the availability results in minutes.
Comparison reflects Isograph’s publicly published materials as of June 2026 and has not been independently benchmarked. Isograph and all other product names are trademarks of their respective owners and are used here only for identification and comparison. Capabilities and licensing of third-party products change — verify current details with the vendor.