PetriKey
Launching soon on Google Play

A private, offline microbiology study bench

Search any organism, disease, stain, test, or concept — see the high-yield clue, jump through related terms, then lock it in with flashcards and quizzes. All on your device.

Coming soon toGoogle Play See what's inside

In Google Play review now — not yet downloadable. No account, no ads, no data leaves your phone.

  • Works fully offline
  • No account required
  • No ads, no tracking
  • Cited, educational only
One connected study loop

Everything wired into a single study loop

PetriKey is not another quiz dump. Each organism, disease, stain, and test links to the ones you confuse it with — so a single search pulls up the whole picture.

Search-first atlas

Type a clue, organism, disease, stain, or antibiotic class and jump straight to a compact reference card. Aliases, fuzzy matching, and recent searches included.

Connected keyword graph

Organism → disease → classic lab clue → confused-with pairs and related terms. Follow the links instead of memorizing isolated facts.

Spaced-repetition flashcards

Review with an again / hard / good / easy rating and see the next-due interval before you commit. Weak cards resurface first.

Quizzes & case prompts

Which-organism-am-I, clue-to-organism, and short case-style questions with correct-answer feedback and related terms to revisit.

Educational ID flows

Branchable identification flowcharts for organism-clue review — walk a decision tree with path chips and related-term links.

Lab Bench tools

CFU math, serial-dilution tables, stain references, colony-morphology notes, and lab vocabulary — conceptual, for coursework only.

Cram Mode

Exam today, tomorrow, or this week? Prioritize must-know entries and confusing pairs by your weak areas for a focused session.

Local progress & notes

Streaks, topic readiness, bookmarks, and private notes stay on-device. Export or import everything as a JSON backup whenever you want.

The library

A deep, source-checked microbiology corpus

Content is synthesized from source families such as OpenStax Microbiology 2e, NCBI Bookshelf, CDC, CDC DPDx, WHO, and ICTV, with source notes and an educational-only boundary.

341Atlas entries: bacteria, viruses, fungi, parasites, tests, antimicrobials, diseases & concepts
682Flashcards with spaced-review scheduling
212Quiz, case & confusing-pair prompts
9Interactive educational ID flows

Entries connect high-yield clues, classifications, associations, and confused-with pairs. Lab and antimicrobial content stays conceptual — mechanisms, interpretation, and study vocabulary, never dosing or specimen-handling instructions.

How it works

Search, connect, review

1

Search a clue

Start from whatever you remember — a stain result, a colony color, a disease, or a half-spelled organism name — and open the matching reference card.

2

Follow the graph

Tap linked terms to move between the organism, its disease, its lab clue, and the pairs students most often confuse it with.

3

Lock it in

Add the entry to review, then reinforce with flashcards, quizzes, and Cram Mode. Your streak and weak topics update on-device.

Who it's for

Built for microbiology students, not clinicians

The first release targets coursework and exam prep for students meeting these organisms for the first time.

Undergraduate microbiology
Nursing & pre-nursing
Pre-med & pre-PA
Medical lab science (MLS/MLT)
Clinical microbiology coursework
Anyone building a microbe vocabulary
Free & Premium

Start free, unlock the full bench

A curated free starter set lets you try the whole workflow before deciding. Premium opens the complete library and study modes.

Free starter set

Try the full workflow

  • 13 atlas entries
  • 12 flashcards
  • 5 quiz prompts & 1 ID flow
  • Search preview across the atlas
Premium

The complete study bench

  • All 341 atlas entries & 682 flashcards
  • 212 quiz & case prompts, 9 ID flows
  • Confusing-pair drills, notes & lab tools
  • Cram Mode & pronunciation support

Offered as a weekly or yearly subscription or a one-time lifetime purchase. Available plans and local prices are shown in the app before you buy.

Study guides

Free microbiology study guides

Evergreen walkthroughs of the topics students search most — useful whether or not you ever open the app.

Foundations

How to read a Gram stain

What Gram-positive and Gram-negative really mean, why the colors happen, and how to turn a stain result into an organism shortlist.

Read guide → Lab skills

Identifying an unknown organism

A student-friendly path from Gram reaction and morphology through catalase, coagulase, oxidase, and hemolysis to a confident ID.

Read guide → Study method

Flashcards & spaced repetition

Why active recall and spaced review beat re-reading, and how to build a microbiology deck that actually sticks before an exam.

Read guide → High-yield

Commonly confused microbe pairs

The look-alikes that cost students points — and the single distinguishing clue that separates each pair.

Read guide →
FAQ

Questions, answered

When is PetriKey available?
PetriKey is currently in Google Play review and launching soon. It cannot be downloaded yet. You can find developer Mobin Akhter's Google Play page in the meantime and check back for the listing.
Does PetriKey work offline?
Yes. The study library is bundled in the app, so search, the atlas, flashcards, quizzes, ID flows, and lab-study tools all work fully offline after download. Your progress stays on your device.
Do I need an account to use PetriKey?
No. PetriKey has no login and no account system. Bookmarks, notes, streaks, and quiz history are stored locally, and you can export or import them as a JSON backup.
What is included for free versus Premium?
The free starter set includes 13 atlas entries, 12 flashcards, 5 quiz prompts, 1 ID flow, and a search preview. Premium unlocks all 341 atlas entries, 682 flashcards, 212 quiz and case prompts, 9 ID flows, confusing-pair drills, notes, lab tools, Cram Mode, and pronunciation support.
Is PetriKey medical advice?
No. PetriKey is an educational study aid for microbiology coursework and exam prep. It is not medical advice, diagnosis, treatment, laboratory protocol, or clinical decision support, and it is not a medical device. Do not use it for patient care or lab-safety decisions.
Who is PetriKey for?
It is built for undergraduate microbiology, nursing and pre-nursing, pre-med and pre-PA, and medical laboratory science (MLS/MLT) students studying bacteria, viruses, fungi, parasites, stains, tests, and antimicrobial concepts.
Does PetriKey show ads or track me?
No ads and no general behavior analytics. Study activity stays on-device. Purchases and premium entitlement checks are handled through the app store and RevenueCat.

Microbiology, keyed to memory

PetriKey is in Google Play review now. Follow the developer page to catch the launch — and browse the study guides while you wait.

Coming soon toGoogle Play