teacher.dev

teacher.dev is a 501(c)(3) education non-profit, formerly BX Coding, that ships one small app for teachers every day and posts the build. As of October 24, 2026 the streak stood at 53 days and the gallery listed 34 free apps built with classroom teachers, most made in a single day and many local-first, with no account and no student data leaving the device.

The narrowness is the value. A review game where one student takes on the class, printable generators for grids, number lines and figures in mathematics, chemistry and physics, a word-building tool for prefixes, bases and suffixes aimed at reading and writing, a First/Then board for special education, a hall pass tracker, and a quiet-time safari where shy animals emerge as a class settles. The gallery spans ten subjects, with about 23 apps student-facing and 20 built for teachers.

What you can do with it

Filter the gallery by subject or by whether an app is student-facing or a teacher tool, then use it straight from the browser. Nothing here is a platform to adopt: each app addresses one recurring classroom moment, so a teacher takes the one that fits, and the Accessibility work appears as calm visuals, large targets and printable outputs rather than a settings panel.

Who it is for

K-12 teachers who want a tool for a specific problem without a subscription, a student account for everyone, or a data agreement to negotiate first, and special education teams wanting supports such as the First/Then board. It also suits developers looking for small, readable examples of classroom software built to a teaching need rather than to a pitch.

Notes and caveats

The pace is both the pitch and the risk. One-day builds target a real classroom problem, not a research question, so nothing here carries an evaluation and a claim about what an app does should be tested in the classroom. Thirty-two public repositories sit in the GitHub organization while the gallery lists 34, all Apache-2.0 with source available, so an app can be read and self-hosted. Local-first design is a claim to verify per app, and a teacher should confirm before putting any student-facing tool in front of a class.

Connected Concepts

Edtech Platform, Accessibility, Game-Based Learning, Student Engagement, Special Education, Student-AI Interaction, Math Education, Science Education, Physics Education, Chemistry Education, STEM Education, English Education (EAP / EFL / ESL)