Free classroom tools

Built for the
classroom.
Not the app store.

Every tool here works in a browser, requires no login, costs nothing, and was built to solve a real problem in a real classroom. No SSO approvals. No district IT tickets. No subscription.

See the tools
Tools
Math · Grades 3–5
DrillBird

Math fact fluency practice built around spaced repetition. Students pick a fact set, drill until every fact is clean, and get a completion screen built for a quick teacher check-in. No accounts. No tracking. Just practice.

Open DrillBird
Writing · Grades 3–5
CER Writer

A structured scaffold for Claim, Evidence, Reasoning opinion writing. Students build their argument step by step with sentence frames that fade as confidence grows. Designed for the projector or individual use.

Open CER Writer
Writing · Grades 3–5
Sentence Roulette

A mentor sentence tool for the smartboard. Spin to reveal a model sentence organized by character trait — a fast, low-prep way to put strong writing in front of students every day. Over 100 mentor sentences built in.

Open Sentence Roulette
Coming soon
More tools
in progress

New tools added as they're built and tested in an actual classroom. No vaporware.

Philosophy
The tools teachers actually need aren't the ones districts approve.

Most classroom tool problems aren't pedagogical — they're logistical. The app requires SSO. The district hasn't approved it. The free tier ran out. The login takes five minutes of class time. So teachers give up, or make do, or build their own.

These tools exist because the gap between what's available and what students need is real. Strong mentor writing and frequent low-stakes practice matter. They shouldn't require a purchase order.

01
No login required Students open a URL and start working. Nothing else.
02
No cost, ever Free to use, free to share, no premium tier.
03
Built in a real classroom Every tool was made to solve a specific problem with specific students.
04
Works anywhere Chromebook, laptop, tablet. Any browser, any school.
the teacher behind it Mr. K

I'm an elementary school teacher currently teaching fourth grade at a Common Core school outside the United States. I teach all four core domains — math, science, social studies, and language arts — to the same group of kids every day.

I started building these tools out of frustration. The apps districts approve rarely match what students actually need, and the ones that do are usually locked behind SSO systems or paywalls that make them impossible to access. So I built my own.

Everything here was made to be used in my classroom first. If it works there, it's worth sharing. More tools are in progress.