C01 / C02 / C03
A selection. Some of it is online, some runs at a single school or on my own workbench.
Three practice apps for primary school on one codebase: arithmetic, spelling and geography, each with its own creature. No multiple choice — the child produces the answer, and a mistake brings a worked example instead of a red cross. Ten minutes of practice earns five minutes of arcade, then the app locks.
A digital literacy curriculum for Dutch primary education: 191 goals across nine domains and four age bands, mapped to the national draft attainment targets. Alongside it a searchable database of lessons and tools for those goals, which teachers extend themselves — reviewed before anything goes live. The curriculum itself comes from the STEV framework.
Every year a Dutch year-6 class picks a leavers' musical, usually on gut feeling and a tip from the school next door. Here they sit together: searchable by cast size, running time and theme, with reviews from teachers who have staged them. One codebase serves both eindmusical.app and kerstmusical.app.
Assignments for hands-on and maker lessons, collected by and for teachers. Anyone who has seen something work adds it along with how it actually went, so the next teacher doesn't have to rediscover what goes wrong with thirty children and one glue gun.
A Dutch adaptation of the EEF's A School's Guide to Implementation: how a school team picks an approach that stands a chance, and then introduces it carefully. Six recommendations, each on its own page. Doing the right things, and doing those things right.
Every N-term from the Dutch central exams, searchable, with a grade calculator and a predictor that estimates the N-term by linear regression. A rebuild of ntermen.nl, originally by Arjan van der Meij.
The shared floor under the platforms above: one core holding auth, database and components, with a thin app per site on top. Onderwijstools.app is the front door that ties them together. It saves months on every new site.