Biology Handbook: Pro

Biology Handbook is an offline reference and trainer for school and first-year university biology: 164 articles in 16 topics, endless practice, flashcards and, on iPhone and iPad, an AI tutor.

EVERY TOPIC IN ONE PLACE
The cell, the chemistry of life, metabolism, cell division, molecular biology, genetics, population genetics and breeding, reproduction, evolution, taxonomy, botany, zoology, the human body, regulation and defence, ecology and the methods of biology.

A SCHEME, NOT A WALL OF TEXT
Each article opens with the record that carries its meaning: 6CO2 + 6H2O → C6H12O6 + 6O2, DNA → mRNA → protein, 2n2c → 2n4c, Aa × Aa → 3 : 1. Every article has a worked example, the limits of the rule and the mistakes that cost marks.

CALCULATE WHERE BIOLOGY CALCULATES
52 articles include a calculator: Hardy–Weinberg, nucleotides to amino acids, DNA length, ATP yield, osmotic pressure, minute volume, microscope magnification, PCR copies, mark–recapture, the ten per cent rule.

PRACTICE THAT NEVER RUNS OUT
13 topics and about 35 kinds of tasks with new numbers every time: complementary DNA, transcription and translation by the genetic code, Chargaff's rules, monohybrid and dihybrid crosses, Hardy–Weinberg, chromosome sets in mitosis and meiosis, ATP, food chains, PCR and more. The app computes every answer, so it is always right; wrong options are the typical mistakes. Sets of 10 tasks, stars, and a link to the theory after each answer.

FLASHCARDS WITH SPACED REPETITION
26 decks and 332 cards: organelles, the genetic code, vitamins, hormones, enzymes, tissues, plant and animal groups and the key terms of every topic. Cards you remember come back after 1, 3, 7, 14 and 30 days; each deck also has a quiz.

AI TUTOR AND PROBLEM SCANNER (iPhone and iPad)
Ask a question in your own words and get a step-by-step explanation from Apple Intelligence running on the device: questions never leave your phone. Photograph a DNA strand or a cross like AaBb × aabb, and the app builds the mRNA, the protein and the ratios exactly, then hands them to the tutor as verified facts. The tutor requires iOS 26 and a device with Apple Intelligence; the scanner works on any iPhone or iPad.

THE TABLES YOU KEEP NEEDING
15 summary tables: the genetic code, taxonomic ranks, organelles, cells of four kingdoms, mitosis and meiosis, DNA and RNA, tissues, organ systems, digestive enzymes, vitamins, hormones, blood groups, plant divisions and animal phyla. Plus 34 reference values and 22 units.

FIND IT FAST
Search by name, term, symbol or unit; filter by topic or favourites; the cheat sheet turns your favourites into a revision list.

20 LANGUAGES
The interface supports 20 languages. Tutor availability and response languages depend on Apple Intelligence; when the interface language is unsupported, the tutor uses English. Light and dark themes, phones and tablets.

FREE AND BIOLOGY PRO
The handbook, calculators, tables and flashcards are free, with three practice sets a day. Biology Pro offers monthly and yearly subscriptions or a lifetime one-time purchase. Eligible new subscribers get a 7-day free trial. Subscriptions renew automatically unless cancelled in the App Store. The price and billing period are shown before purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Written as a study aid following standard school and introductory university treatments. It is not medical advice.