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 6 materials side by side, with CSV export (free compares 2)
  • Create and save your own custom formulas
  • Unlimited quiz and flashcards across every discipline
  • Your full calculation history, not just the 3 most recent rows
  • Everything works offline in your browser

Weekly, yearly and lifetime plans are available. Live prices load below; the yearly plan works out cheapest per week, and lifetime is a single payment with no renewal.

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.

I already subscribed on another device — how do I get access here?

Open the Premium page on the device where you subscribed, copy the access code shown there (or use your receipt), then restore it on this browser.

Restore access

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.

I lost my access code — can you help?

Yes. Reach out through the support channel on our Privacy page from the email address on your receipt, and we can look up your access code.

Contact via Privacy page