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PetriKey Premium

Study microbiology in depth.

Keep the free reference and daily quiz, or go further: unlimited quiz across all 5 modes, all 8 flashcard decks, mastery tracking, and per-organism study notes.

Browse the libraryIdentification flowsTry the daily quiz

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What stays free?

Every reference page stays free: all 341 organism and topic cards, the identification flowcharts, the Gram-positive and Gram-negative browse, the guides, category browse, and full-text search. Free also includes the first 6 cards of all 8 flashcard decks, a fresh 10-question quiz round every day, the first 6 rows of every printable sheet, and your study streak. No account is needed for any of it.

How is my access stored?

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

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Head to Restore access and paste the access code shown on this Premium page (or from your receipt). Premium moves to this browser instantly.

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.

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Your code is shown on this page whenever you're subscribed here, and it's included in your purchase receipt email. If you can't find it, reply to your receipt email from the address you paid with - your subscription is tied to it and access can be recovered from there.

What Premium unlocks

  • Unlimited quiz across all 5 modes - clue, organism, lab, case, and confusing-pair - instead of one 10-question round a day
  • Every flashcard - all 682 cards across 8 decks, not just the first 6 of each
  • Printable study sheets - all 8 sheets covering 341 reference cards, print-ready instead of a 6-row sample
  • Mastery tracking on flashcards, and a per-mode accuracy breakdown on your progress page
  • Per-organism study notes, saved in your browser

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 341 organism and topic cards, the identification flowcharts, the Gram-positive and Gram-negative browse, the guides, category browse, and full-text search. Free also includes the first 6 cards of all 8 flashcard decks, a fresh 10-question quiz round every day, the first 6 rows of every printable sheet, and your study streak.