The constraints are scattered
In a spreadsheet, on notes, in messages, in the coordinator’s memory. When something changes, nobody knows what else it breaks.
The rules editor for your school timetable
Every timetable rule, one sentence you can read.
Write your school’s constraints the way you’d say them in the staff room. baldru shows what each rule will do, who it applies to, and what happens when it meets another rule — before the solver builds the timetable.
Access is by invitation: every school gets its own key.
The problem
A timetable is built from constraints. They shouldn’t live in one person’s head.
Generic software doesn’t speak your school’s language
A homeroom teacher who opens the week with her class, a light day, a teacher with a long commute — there they become checkboxes and weights nobody can read later.
“No solution” — with no reason why
When not everything is possible, you need to know what gave way, for whom, and by how much. Not just that something failed.
How it works
Three steps, and you can see what happens at each one
Write a rule
Pick one of 40 types, or describe what you need in words. The rule appears as one sentence, and every value in it is a button.
Say how important it is
“Must” never moves. “High”, “medium” and “low” are preferences — and they decide who gives way when not everything is possible.
Read what it will do
Before you save: who the rule applies to, what happens if it can’t be met, and which other rule touches the same teachers.
The sentence is the form
There is no separate form. You edit the sentence itself.
Every value in the sentence — a number, a teacher, a group, a priority — is a button that opens its own panel. There is no read mode and edit mode: you read exactly what you edit, so a rule aimed at the wrong people is caught just by reading it.
- “At least” and “at most” in one click
- Scope in five dimensions: teachers, classes, subjects, days and periods
- A note on every rule — who asked, when, and why
What this will do
Every rule explains itself — including when it meets another rule.
Under every rule is a plain-language explanation: who it applies to, whether it is a requirement or a preference, and what happens if it can’t be met. When another rule of the same type reaches the same teacher, it says which one wins — the narrower one.
Screens
Four views of the same rules
One rail at the side holds four views, and the panel beside it is always the thing you are looking at.
Every rule, in three buckets
School-wide rules, rules for groups and personal rules — searchable, with a coloured dot for each priority.
Everything that reaches one teacher
Pick a teacher and see her personal rules, the general rules that apply to her, and which rule overrides which. If a sentence here doesn’t describe reality, the rule itself is wrong.
40 rule types, each with an example
Gaps, load, availability, homeroom mornings, light days and more. A closed list: any type can be applied to as many teachers and values as you like.
Define a group once
Homeroom teachers, part-time staff, core subjects, late periods — instead of repeating one rule for every teacher, the rule points at the group.
Or in words
Describe what you need. The assistant drafts a rule. You decide.
Write it like a message, and the assistant proposes a finished rule — in exactly the sentence the editor shows. Nothing is saved until someone accepts it, and if the proposal can’t be shown with confidence, it isn’t shown at all.
Ask meSuggests a rule — does not save it
Rivka does not want more than one gap a day
Got it. Here is what I suggest:
A suggestion — not saved
at most one gap a day
Day to day
And a few things that make the difference
A team with roles
School owner, editors and viewers. A viewer can read every rule, and can’t change one.
A note on every rule
Who asked, when, and why. The solver’s report quotes it.
Everything in one file
All the rules in a single file you can download, back up and hand over.
A double check
One engine builds the timetable, and a separate one checks it against the same rules — a mistake in either shows up as a disagreement.
Hebrew and English
A full right-to-left interface, and English when you need it.
Light and dark
Following your computer, or your choice.
Why we built it
Built for a real school the well-known tools couldn’t schedule.
baldru started with one school, whose rules the big timetabling products couldn’t express. Instead of bending the school to the software, we built the rules the way its timetable coordinator words them.
And behind them, an engine that doesn’t just build a timetable but explains it: why a perfect one is or isn’t possible, and what it would cost to get closer.
- rule types
- 40
- scope dimensions per rule
- 5
- independent engines — one builds, one checks
- 2
Privacy
Your school’s data stays your school’s
Only what the timetable needs
Teachers, classes, subjects, days and periods — and the rules. There is no student data in the file.
Invitation only
There is no open sign-up. Everyone comes in with a personal key, and the school owner decides who edits and who views.
The assistant suggests — it doesn’t save
No change reaches the rules without a person accepting it.
The file is yours
Download every rule at any time, in a single file.
Need a privacy document for whoever approves this at your school? Write to us.
FAQ
Questions worth asking
How do we get access?
Write to us and you get a personal invitation key for your school. There is no open sign-up.
What does it cost?
Pricing is per school. We’ll go through it on the first call.
Do we need to install anything?
No. It is a website — you use it in the browser.
What is the difference between “must” and a preference?
A “must” that can’t be met means no timetable is produced, and you get a report on what blocked it. A preference can give way, and the report says for whom and by how much.
What if the rule we need doesn’t exist?
There are 40 types, and each can be applied to any group with any values. A completely new type needs a change to the software — tell us what’s missing.
Can it connect to our other systems?
Tell us what you need — a calendar, a management system, an automatic export — and we’ll get back to you.
Want to see your school’s rules as sentences?
Write to us, and we’ll get back to you with an invitation key.
Already have a key? Sign in to the editor