errorboard is an independent study tool. It watches the one app you choose, marks the moment you slip, and files it into a tidy error log for that subject — so the time you spend revising goes to the mistakes you actually make, not the pages you already know.
Most studying is re-reading. You go back over a chapter, nod along at the bits you already understand, and quietly skip past the one step where you keep tripping. The mistakes — the dropped negative, the sign slip when dividing, the question type you fail every single time — never get collected anywhere. They just happen again in the exam.
The fix is old and boring and it works: keep an error log. A running record of what you got wrong and why, reviewed before the next session. The trouble is that doing it by hand is tedious enough that almost nobody keeps it up. You're mid-problem, you don't want to stop, screenshot, annotate, and file. So the log dies in week two.
errorboard exists to make that log keep itself.
The fastest revision is the kind targeted at your own errors. Everything errorboard does is built to surface those and keep them in front of you.
A study tool that nags you is a study tool you turn off. errorboard runs in the tray, never interrupts, and only speaks up inside a log you choose to open.
It watches one app you allow, on a monitor you pick, and nothing else. No keylogging, no full-screen capture, no tracking what you do elsewhere.
Logs are ordinary Word files in your own Documents folder. No lock-in, no proprietary format — open them in anything, keep them forever, leave whenever you like.
Plenty of apps will quiz you, hold flashcards, or block distracting websites. errorboard does something narrower and, we think, more useful: it sits beside the way you already study and does the one chore you'd never keep up by hand.
It started as a personal habit — a notebook of every maths mistake before exams — that worked brilliantly and was impossible to maintain by hand.
The first build was a small Windows app that watched a single chosen window and screenshotted the moments work looked wrong, so the logging happened without breaking focus.
A cloud vision model turned those screenshots into marked mistakes with a short explanation — including handwritten maths — and filed them per topic automatically.
A built-in handwriting notebook, an iPad and browser experience, and synced logs across devices followed — so the same error log is wherever you study.
errorboard is an independent, self-funded project — not a venture-backed startup chasing engagement metrics. It's built and maintained by a small team that studied exactly this way, which is why the whole thing is shaped around being quiet, private, and genuinely useful rather than sticky.
Because it's small, it ships honestly: the free tier really is free and needs no account, Pro is a flat subscription with a free trial, and there are no ads and no selling of your data — there's nothing to sell, because the app is built to see as little as possible. You can read exactly what it captures and where it goes in the privacy policy.
The direction is steady, not flashy: better marking across more subjects, a tighter notebook, and logs that travel cleanly between your desktop, iPad, and browser. We'd rather do that one well than bolt on features nobody asked for.
Questions, feedback, or a subject errorboard marks badly? We read everything. Email support@errorboard.com or follow along on Instagram.