Free tools I built for my classroom.

A fullscreen countdown for exam conditions. Logs extra time and rest breaks. Large, plain and readable from the back of the classroom. 

Drop in a class list, run a league table and/or a knockout competition. Works for competitions or end-of-term quizzes.

A fullscreen board for exam halls running several papers at once. Each subject gets its own panel showing end times for normal and extra time groups.

Enter raw marks and grade boundaries, get a full percentage table, box plot and grade distribution. Works for any exam board or in-house assessment.

Build a colour-coded weekly timetable in minutes. Supports multiple weeks, day and week views, and exports to a print-ready layout.

Paste a class list and pick a student at random. Fair mode works through everyone before repeating. Second tab splits the class into randomised groups.

Sketch a room, drop in names, generate a plan that respects keep-apart, sit-together and front-row rules. Click to swap, pin students in place, and import or export the whole class as an Excel file.

Countdown, stopwatch and live clock in one tool. Digital and analogue displays, fullscreen mode, lap tracking, and colour warnings when time is nearly up.

A whole academic year on one page. Enter your term dates and inset days, and bank holidays fill in automatically for any year. Counts school days, holidays, inset days and more, then prints to a single page.

Interactive tools for teaching GCSE probability. Sample spaces, playing cards, spinners, probability trees, Venn diagrams and more.

Drag numbers into their sets, learn ∩ ∪ and ′ by diagonal shading, paint two- and three-set Venn diagrams, and read conditional probability across Venns, tree diagrams and two-way tables. Complex numbers toggle for A-level and Further Maths.

Interactive A-level explorer for the normal curve. See translation and stretch as you change μ and σ, the 68-95-99.7 rule, a probability calculator and standardising with Z-scores.

Interactive A-level explorer for X ~ B(n, p). Adjust n and p to reshape the bars, calculate P(X = k), cumulative and range probabilities, and review the conditions and formula.

A one-page map of every A-level and Further Maths distribution. See the shape of each, when to use it, and its mean, variance and formula at a glance.

Watch sine, cosine and tangent built straight off the unit circle, meet sec, cosec and cot through similar triangles, read solutions and the CAST rule off the graphs, and explore the inverse functions. Built for KS4 and KS5.

Prove the standard identities from the unit circle, then build the compound, double and harmonic (R sin/cos) formulas with interactive diagrams, and see why the small angle approximations only work in radians. Built for KS4 and KS5.

The sine rule, cosine rule and area formula, each proved from one draggable triangle. Send the height inside or outside the shape to see the proofs still hold, with the ideal use case and the ambiguous case for each. Built for KS4 and KS5.

Type your own numbers in and watch every step: dimensions, adding, scalar and matrix multiplication, the determinant, and the inverse of a 2×2 and a 3×3 with cofactors. Built for KS4 and KS5.

See exactly what a 2×2 matrix does to the unit square: rotations, reflections, stretches, enlargements and shears, rotation by any angle, combining transformations, and the invariant points and lines. Built for KS4 and KS5.