EngiRef Premium

Engineer in depth.

Keep the free reference, or go further: multi-material compare with CSV export, your own custom formulas, the unlimited quiz across every discipline, and full calculation history — all offline in your browser.

OverviewTry the daily quiz

Choose a plan

Unlock everything

  • Compare up to six materials side by side, with CSV export
  • Create and save your own custom formulas
  • Unlimited quiz and flashcards across every discipline
  • Full calculation history — not just the last ten
  • Everything works offline in your browser

Premium plans are launching soon. In the meantime, the free tier already covers formula browsing across every discipline, the unit converter, all reference tables, physical constants, single-material search, and a fresh daily quiz round.

Start with the free formulasOpen the converter

Good to know

Questions

What stays free?

Formula browsing across every discipline, the unit converter, all reference tables (metric and imperial bolts, pipe schedules, wire gauges), physical constants, single-material search with full property sheets, and a fresh daily quiz round are free forever — no account needed.

How is my access stored?

Purchases are handled by RevenueCat and Stripe. An anonymous purchase id is kept in this browser so EngiRef recognises your Premium access on this device. Keep your receipt email for recovery.

Can I cancel?

Yes. Subscriptions renew automatically and can be cancelled anytime from the link in your receipt email. Lifetime is a one-time payment.