Built for the Projector, Not Around It
Most free teacher tools are websites first and classroom displays second: the timer works, but a banner ad flashes next to it in front of thirty students. Every tool here was built the other way round. The fullscreen presentation mode is the product — a distraction-free display for the smartboard — and the regular page around it is where the (clearly separated) ads live, because that is what keeps everything free.
Privacy That Survives a School Review
None of these tools have accounts, logins, or student profiles. Class lists, seating rules, word lists, scores, and timers are stored in your own browser only. The noise meter is the clearest example: it reduces microphone input to a single loudness number in the browser and discards the audio — nothing is recorded, and nothing could be, because no audio ever leaves the device. When the privacy office asks where student data is processed, the answer is: on the teacher's computer, full stop.
Start With These Three
If you are setting up for a new school year: the seating chart generator handles the real-world rules (“these two cannot sit together”, “she needs the front row”), the classroom timer covers transitions and activities on the board, and the random name picker keeps cold-calling fair with an already-picked list. For test season, the exam clock adds per-paper countdowns and one-click 25% extra-time rows. There is also a one-page printable cheat sheet of the whole set for your desk drawer or a colleague.