BioNinja
ib.bioninja.com.auIB Biology notes for the current syllabus, topic by topic. Opens on A1.1 Water; the menu jumps to every topic.
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BioNinja
IB Biology notes for the current syllabus, topic by topic. Opens on A1.1 Water; the menu jumps to every topic.
Christos Nikolaidis: Maths AA
Free IB Maths AA notes, exercises and exam practice from an experienced IB teacher.
MSJChem
IB Chemistry video tutorials that follow the syllabus closely.
Chemguide
Detailed, trusted explanations of physical, inorganic and organic chemistry.
The Physics Hypertextbook
A free, beautifully written physics textbook online.
Khan Academy Biology
Videos and practice from cells to ecology.
Richard Thornley
IB Chemistry and Physics videos, topic by topic.
IB Maths Resources
Hundreds of free maths exploration (IA) ideas from an IB teacher.
IB Diploma Programme curriculum
Official overview of every DP subject group and the core.
DP assessment and exams
How DP grading, exams and results work, from the IB.
Theory of Knowledge (IB)
Official TOK course overview and assessment summary.
Extended Essay (IB)
Official EE overview: what it is and how it is assessed.
CAS (IB)
Official CAS overview: strands, outcomes and the project.
Amoeba Sisters
Short animated videos that make core biology concepts click.
HHMI BioInteractive
Free films, data activities and virtual labs from HHMI.
Learn.Genetics (Utah)
Interactive genetics, cell biology and neuroscience modules.
PhET: Natural Selection
Change the environment and watch a rabbit population evolve.
PhET: Gene Expression Essentials
Build proteins from genes and see what controls expression.
PhET: Neuron
Stimulate a neuron and follow the action potential.
IUCN Red List
Official conservation status data for species. Great for IA and EE data.
Khan Academy Chemistry
Videos and practice on atoms, bonding, equilibrium and more.
Ptable
Interactive periodic table with properties, orbitals and isotopes.
ChemCollective virtual labs
Run virtual titrations and experiments with real lab equipment.
PhET: Build an Atom
Build atoms from protons, neutrons and electrons.
PhET: Isotopes and Atomic Mass
Explore isotopes and how relative atomic mass is calculated.
PhET: Molecule Shapes
See VSEPR shapes and bond angles in 3D.
PhET: Molecule Polarity
Change electronegativity and see bond and molecular polarity.
PhET: Concentration
Explore moles, volume and concentration of solutions.
PhET: Beer's Law Lab
Link concentration to absorbance with a virtual colorimeter.
PhET: Balancing Chemical Equations
Practise balancing equations with visual feedback.
PhET: Reactants, Products and Leftovers
Limiting reactants made visual.
PhET: pH Scale
Test everyday liquids and see the pH scale on a log scale.
PhET: Acid-Base Solutions
Compare strong and weak acids and bases at the particle level.
The Physics Classroom
Plain-language physics tutorials, chapter by chapter.
HyperPhysics
A concept map of physics. Fast for looking up any formula or idea.
Khan Academy Physics
Videos and practice from kinematics to quantum.
Tracker video analysis
Free video analysis tool. Track motion from your own videos for an IA.
PhET: Projectile Motion
Launch objects and test range, angle and air resistance.
PhET: Forces and Motion: Basics
Net force, friction and acceleration.
PhET: Collision Lab
Momentum and elastic vs inelastic collisions.
PhET: Energy Skate Park
Conservation of energy with a skater on a track.
PhET: Gas Properties
Pressure, volume and temperature at the particle level.
PhET: States of Matter
Heat and cool particles and watch phase changes.
PhET: Blackbody Spectrum
See how temperature changes a body's emission spectrum.
PhET: Greenhouse Effect
Model how greenhouse gases change Earth's energy balance.
PhET: Circuit Construction Kit: DC
Build circuits and measure current and potential difference.
PhET: Wave on a String
Amplitude, frequency, damping and standing waves.
PhET: Wave Interference
Two-source and double-slit interference with water, sound and light.
PhET: Bending Light
Refraction, Snell's law and total internal reflection.
PhET: Pendulum Lab
Simple harmonic motion and the period of a pendulum.
PhET: Masses and Springs
Oscillations, spring constants and energy in SHM.
PhET: Gravity and Orbits
Orbits of planets and moons under gravity.
PhET: Charges and Fields
Electric field lines and equipotentials from point charges.
PhET: Faraday's Law
Induce an emf with a magnet and a coil.
PhET: Rutherford Scattering
Fire alpha particles at a nucleus and see why the model changed.
PhET: Greenhouse Effect (ESS)
Model how greenhouse gases change Earth's energy balance.
Desmos Graphing Calculator
Free graphing calculator. Perfect for checking functions and IA graphs.
GeoGebra
Free graphing, geometry, 3D and statistics calculator.
Paul's Notes: Calculus I
Calculus I notes with worked examples: limits, derivatives, integrals.
3Blue1Brown: Essence of Calculus
The Essence of Calculus: beautiful visual explanations.
Khan Academy Calculus
Limits, derivatives and integrals with practice.
Khan Academy Statistics
Statistics and probability from basics to inference.
Khan Academy Trigonometry
Trig ratios, the unit circle and identities.
Khan Academy Algebra 2
Sequences, logarithms, polynomials and complex numbers.
CS50x (Harvard)
Harvard's free intro to computer science and programming.
W3Schools Python
Python tutorial with try-it-yourself examples.
Python Tutor
Step through code line by line and see what memory does.
Gapminder Tools
Animated world development data. Great for spotting trends.
Global Forest Watch
Live maps and data on forest loss worldwide.
Teach PE
Free notes on anatomy, physiology and training for sports science.
Khan Academy Health and Medicine
Body systems, physiology and health explained.
EconplusDal
Clear economics videos with diagrams, micro and macro.
Khan Academy Macroeconomics
GDP, inflation, monetary and fiscal policy.
Khan Academy Microeconomics
Supply, demand, elasticity and market structures.
World Bank Open Data
Free country data for economics and geography IAs.
Alpha History
Free history topic sites with sources, timelines and summaries.
Spartacus Educational
Encyclopedia of modern history with primary sources.
Wilson Center Digital Archive
Declassified primary sources, strong on the Cold War.
Avalon Project (Yale)
Treaties and key documents in law, history and diplomacy.
Khan Academy World History
Videos from ancient to modern world history.
World101 (CFR)
Free lessons on global issues, institutions and how the world works.
Simply Psychology
Clear summaries of studies, theories and research methods.
Themantic Education IB Psych blog
Free IB Psychology blog posts on studies and exam skills.
SparkNotes
Literature study guides: summaries and analysis of major works.
Poetry Foundation
Thousands of poems with poet biographies.
Project Gutenberg
70,000+ free public-domain books.
Purdue OWL: MLA citations
MLA citation guide: how to cite sources correctly.
WordReference
Dictionaries and forums for French, Spanish, German and more.
Linguee
See words and phrases translated in real sentences.
Conjuguemos
Verb conjugation and vocabulary practice.
TV5Monde: Apprendre
French listening and reading exercises by level.
DW Learn German
Free German courses from beginner to advanced.
Smarthistory
Free art history essays and videos.
Google Arts & Culture
Explore museum collections in high resolution.
Student Art Guide
Sketchbook, portfolio and process ideas from top students.
musictheory.net
Free lessons and ear training exercises.
IMSLP
Free public-domain sheet music library.
Stanford Encyclopedia of Philosophy
Trusted articles on knowledge, truth and ethics.
Google Scholar
Search academic papers for your EE and IAs.
Semantic Scholar
AI-assisted search for research papers.
CORE
Millions of free, open-access research papers.
Zotero
Free reference manager. Builds your bibliography for you.
UN Sustainable Development Goals
Ideas and data for CAS projects with real impact.
Anki
Free spaced-repetition flashcards. Best for memorising definitions.
Pomofocus
Simple Pomodoro timer for focused study blocks.
Economics Help
Clear explanations and diagrams for micro, macro and global economics.
Christos Nikolaidis: Maths AI
Free IB Maths AI notes, exercises and exam practice from an experienced IB teacher.
Math is Fun: Calculus
Friendly calculus explanations with interactive examples.
Math is Fun: Data and probability
Statistics and probability explained simply.
Math is Fun: Algebra
Algebra, functions, logs, sequences and trigonometry.
Paul's Notes: Algebra
Exponents and logarithms notes with worked examples.
OpenStax Biology 2e
Free university biology textbook. Opens on Chapter 1.
OpenStax Chemistry 2e
Free university chemistry textbook. Opens on Chapter 1.
OpenStax Introductory Statistics 2e
Free statistics textbook. Opens on Chapter 1.
Crash Course Biology
Fast, clear biology video series.
Crash Course Chemistry
Fast, clear chemistry video series.
Crash Course Psychology
Fast, clear psychology video series.
Crash Course Economics
Fast, clear economics video series.
Crash Course World History II
Modern world history in short videos.
W3Schools DSA
Data structures and algorithms tutorial: sorting, searching, stacks, trees.
W3Schools SQL
SQL and databases tutorial with live examples.
Purdue OWL: APA citations
APA formatting and referencing guide.
Our World in Data: Biodiversity
Charts and data on species, habitats and extinction.
Our World in Data: CO₂ and greenhouse gases
Emissions data by country and sector.
Our World in Data: Population growth
Population data and projections.
Our World in Data: Urbanization
How and where cities are growing.
Our World in Data: Energy mix
Where the world's energy comes from.
Our World in Data: Water use and stress
Freshwater use and scarcity data.
Our World in Data: SDG tracker
Progress on the 17 Sustainable Development Goals.
Economics Help: Break-even analysis
Break-even point, margin of safety and the break-even chart explained.
Economics Help: Cash flow
What cash flow is and why businesses fail without it.
Economics Help: Costs of production
Fixed, variable and total costs with diagrams.
Economics Help: Brand loyalty
Why branding matters and how firms build loyal customers.
Crash Course Economics: Market failures
Externalities, taxes and subsidies in one short video.
IB Biosone
An IB Biology teacher's free site: slides, student note packs and links for every topic of the new syllabus.
I-Passed: IB Biology notes
Free topic-by-topic notes for A1.1 to D4.3 with key terms, exam technique and a quick check.
Chemsone
Free IB Chemistry site from the Biosone family: slides, notes and links for every S and R topic.
Chemistry Student: IB Chemistry
Full IB Chemistry notes for every subtopic, with diagrams, quick notes and videos.
IBDP Physics hub (IBG 2025)
School physics site for the 2025 syllabus: video playlists, slides and quizzes for every topic A.1 to E.5.
tutor2u: IB Economics study notes
About 80 short IB Economics study notes, micro to development, written by economics teachers.
Open Geo
Free, teacher-curated IB Geography resources for every core unit, option and HL topic.
IB Business Management site
Free notes for all five BM units, the toolkit, IA and exam review.
BM toolkit explained
Short pages on every BM toolkit tool: SWOT, Ansoff, BCG, decision trees, CPA and more.
Computer Science Café: IB CS
Free IB CS lessons for the 2027 syllabus with terms, questions, flashcards and workbooks.
Mr Budd History
An IB History teacher's free site: Cold War and Asia topics with notes and exam questions.
John D Clare History
Clear free notes and factsheets on Stalin, Weimar and Nazi Germany, WWII and the Cold War.