A free calculator that takes your classes and your numbers and shows the hours your marking and reports quietly cost you each year. No sign-up, and nothing you type leaves your computer.
Free · no sign-up · runs entirely in your browser.
Put in your own classes and minutes. The calculator adds up your year and shows what that pile costs in evenings, weekends and full work-weeks. This is the founder's own story: he watched the maths up close.
Open Period drafts that first version, a calibrated first pass on every piece, so your hours go to the decisions, not the keyboard. You approve every word.
Get the full tool free →Your numbers, your maths: a rough picture to make the invisible visible, not a precise audit.
"I built Open Period because I watched the maths up close: the pile that never shrinks, the evenings that do, and the feedback cut first every time. I didn't want a tool that marked for teachers. I wanted one that gave the boring half back and left the judgement where it belongs. With you." Scott, the maker · English teacher in training, ACU
The full tool drafts the first pass on your marking, reports and parent emails, privately, on your computer, with names stripped before anything reaches the AI. You read, change and approve every word. Leave your email to be first in when it opens.
We'll email you the moment we open the doors. No card, no spam.
The founding cohort is small. Bring your staffroom in with you and share with 3 teachers who'd want their hours back too.
This is the full tool drafting a first pass on a real student draft. The boring half is written, and the on-balance call stays entirely the teacher's.
A calibrated first pass on a real draft: the typing done, the judgement still yours.