What Premium unlocks
- Step-by-step working on every triangle you solve. Free shows the answer always, and the working once a day.
- All 35 applied problem templates, from ladders and shadows to bearings, navigation, surveying, oblique triangles and periodic models. Free opens the first 10.
- Quizzes on the topics you pick, freshly shuffled every round. Free gets today's 15 question round, the same one for everybody, retakeable as often as you like.
- The progress dashboard: accuracy per skill, and your full quiz history rather than the last 3 rounds.
Weekly, yearly and lifetime plans are available - live prices load below. Subscriptions cancel anytime; lifetime is a one-time payment.
Every reference page stays free: all 45 identity pages, the 16 topic pages, every guide, the unit-circle explorer, and every answer the triangle solver gives you.
Trigonify Premium
Master trigonometry, not just look it up.
Keep the free reference, or go further: the triangle solver's step-by-step working every time rather than once a day, all 35 applied problem templates, quizzes on the topics you pick, and a progress dashboard with per-skill accuracy - saved privately in this browser.
Choose a plan
Unlock everything
Good to know
Questions
What stays free?
Every identity page, topic page and guide, the interactive unit-circle explorer, every answer the triangle solver gives you (sides, angles, area and perimeter, on as many triangles as you like), one worked step-by-step solution a day, the first 10 applied problem templates, a 15 question daily quiz you can retake as often as you like, and your headline scores with the last 3 rounds. No account needed for any of it.
What exactly does paying change?
Four things, and only these four: the solver shows its working every time instead of once a day; the remaining 25 applied problem templates become live; the quiz lets you choose topics and reshuffles a new round every time you start one; and Progress adds accuracy per skill plus your full round history. Nothing that is free today moves behind the wall.
How is my access stored?
Purchases are handled by RevenueCat and Stripe. An anonymous purchase id is kept in this browser so Trigonify 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.
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. Email us from the address on your receipt through the support channel on our Privacy page and we can look up your access code.