Interactive simulations for IB DP Biology, Chemistry and IGCSE Science. Built for teachers who explain concepts themselves — and want students to see them.
Osmosis, turgor, plasmolysis and ψw = ψs + ψp. Six cell types with accurate internal concentrations. Animated particle ratios. Equilibrium crossing counter.
Replication fork animation. Helicase, leading strand, lagging strand, Okazaki fragments. Semi-conservative replication with pause-and-question checkpoints.
Interactive chromosome movements. Crossing over slider. Non-disjunction toggle. Shows Down syndrome as a consequence of meiotic error.
Fluid mosaic model. Simple diffusion, facilitated diffusion, active transport with ATP cost. Adjustable concentration gradients. Bridges into nephron and neurons.
Adjust selection pressure, mutation rate and population size. Watch allele frequencies shift over generations. Toggle directional, disruptive and stabilising selection.
Substrate concentration, pH, temperature, competitive and non-competitive inhibition. Michaelis-Menten curves. Multi-trial data with CSV export. IA-ready.
Resting potential, depolarisation, repolarisation. Ion channel states. Propagation along unmyelinated and myelinated axons. Saltatory conduction.
Collision theory visualised. Temperature, concentration and surface area effects on reaction rate. Maxwell-Boltzmann distribution. Activation energy and catalysis.
Spring extension vs. force. Elastic limit. Multiple spring configurations. Generates lab data with scatter and best-fit line. Built for IGCSE practical assessment.
These simulations are designed for IB DP Biology, IB DP Chemistry and IGCSE Science. Each one is built around a specific syllabus section, aligned to command terms and assessment objectives.
The philosophy: the teacher explains the concepts. The simulation shows what can't be drawn on a board — particle behaviour, dynamic equilibrium, concentration gradients, real-time response.
All simulations are free, require no account, and work in any browser. No tracking. No ads.