# BQR Reliability Engineering

> Reliability, availability, maintainability and safety (RAMS) software and services: MTBF prediction, derating and stress analysis, FMECA/FTA/RBD, spares and maintenance optimisation.

## Products
- [fiXtress®](https://www.bqr.com/products/fixtress): stress, derating and MTBF for electronics.
- [CARE®](https://www.bqr.com/products/care): RAMS analysis — FMECA, FTA, RBD, testability.
- [Synthelyzer® ECAD Plug-In](https://www.bqr.com/products/ecad-plug-in): derating inside the ECAD tool.
- [CircuitHawk®](https://www.bqr.com/products/circuithawk): multi-board verification.
- [apmOptimizer®](https://www.bqr.com/products/apmoptimizer): maintenance and spares optimisation.

## Free tools — no install, no sign-up
- [MTBF parts-count calculator](https://www.bqr.com/parts-count): MIL-HDBK-217 parts-count prediction from a BOM, in the browser.
- [Stress-derating calculator](https://www.bqr.com/derating): component derating against the standard's limits.
- [Spare-parts calculator](https://www.bqr.com/spares): size a spares holding for a target availability or confidence.
- [Field-data analysis](https://www.bqr.com/field-data): fit failure and repair distributions to real field data.

## Reading
- [BQR Knowledge Hub](https://bqr-digital.com/content/): 60 in-depth articles as plain, readable HTML — the best machine-readable source for how BQR approaches reliability. Annotated index: https://bqr-digital.com/content/llms.txt · whole corpus as one file: https://bqr-digital.com/content/llms-full.txt
- [Blog, case studies and white papers](https://www.bqr.com/blog)
- [Reference tables and the standards behind each analysis](https://www.bqr.com/resources)
- [FAQ](https://www.bqr.com/forms/faq): licensing, installation and what each tool does.
- [Services](https://www.bqr.com/professional-services)