ZeroClash · by ZeroSuite

The school timetable that builds itself. And it covers itself.

The 8 a.m. sick call sorted before the bell. Fair cover, ranked in seconds.

In secondsFull-school generation

0Double-bookings

Ranked & fairCover suggestions

Animated demo of the cover workflow with sample data. A teacher, N. Rao, is marked absent for Period 3, Class 9-B. ZeroClash lists teachers who are genuinely free that period, ranked fairly, with the best pick being S. Iyer. The admin assigns the cover in one click, and the covering teacher gets an in-app and browser push alert.

Why ZeroClash

Everyone generates a timetable. We make the daily absences disappear.

Anyone can generate a timetable. The hard part is 8 a.m. on a Tuesday, when a teacher calls in sick and three classes suddenly need covering. That is the moment ZeroClash was built for.

Substitution-first

Cover is the headline feature, not a buried ERP tab. Mark a teacher out and the cover list is already built.

Transparent ranking

Every suggestion shows its reason: "free this period · teaches Physics · only 1 cover this week."

Fair cover

It spreads the load, factoring back-to-back fatigue and who is lightest that day, so it is never the same tired few teachers pulled in to cover every gap.

Web & India-priced

No Windows install. A web app for any device, built for CBSE, ICSE and State Board, and priced in ₹.

The cover workflow

Mark a teacher out → ranked, fair cover in seconds.

Cover, instantly

Genuinely free, ranked, and shared fairly.

Mark a teacher absent, whether it is a full day, a late arrival or an early leave, and ZeroClash builds a cover task for every affected period, then ranks the teachers who can actually take it. It re-checks every pick before you assign, so you never hand someone a clash.

Only suggests teachers genuinely free at that hour
Ranked by subject fit, then a fair, lightest-load balance
Each suggestion shows the reason it was picked
Assign in one click, and the covering teacher gets an instant in-app and browser-push alert

Want the full cover story? See our dedicated teacher substitution software page.

Automatic generation

A conflict-free schedule for the whole school, in seconds.

Under the hood is a real constraint solver (Google OR-Tools CP-SAT) that places every teacher, subject and room at once. What a committee builds over three weeks now generates automatically, ready to refine.

The engine

No double-bookings. Manual edits flagged live.

A full generation guarantees no teacher, room or section is double-booked. When you tweak it afterwards on the drag-and-drop canvas, conflict warnings appear the instant you create one, and Magic Fix suggests safe slots to resolve it for you.

Generates in seconds (minutes for very large schools)
No double-bookings across teachers, rooms or sections
Drag-and-drop overrides with live conflict warnings
Magic Fix suggests safe slots to clear a conflict

Built for India

Made for CBSE, ICSE and State Board schools.

Wings, sections & divisions

Real multi-wing schools: Primary to Senior, with multiple sections and divisions per class, scheduled together.

Lab periods & room rules

Double labs, room capacities and "Lab B only on Tuesdays"-style constraints handled by the solver.

₹ pricing · CBSE / ICSE / State Board

India-priced plans and a web app on any device. Part of ZeroSuite alongside School ERP and HRMS.

School ERP sync (optional)

Auto-pull daily staff absences from ZeroSuite School ERP; by default an admin marks a teacher absent in one click.

See it live

The engine, in action.

Live previews of the interactive dashboard: the three moves that set ZeroClash apart from a spreadsheet. Every pixel below is rendered, not a screenshot.

Fast Generation

A full timetable falls into place in seconds. Every teacher, subject and room placed by the solver, without a single manual drag.

Conflict Resolution

When two subjects collide, ZeroClash flags the clash and reshuffles slots until every period is clean and green, with no double-bookings.

Fair, Ranked Cover

Teacher out? You get a ranked list of genuinely-free teachers, balanced for fairness, with the reason for each pick shown.

How it works

From your rules to a published timetable in three steps.

Configure once, reuse every term. ZeroClash turns your school's constraints into a conflict-free schedule on demand.

Set constraints

Teacher availability, consecutive-period limits, lab days, subject frequencies, room capacities. Set it once; it carries forward.

Generate

Hit generate. The constraint solver produces a balanced, conflict-free timetable for every section in seconds.

Publish

Tweak on the drag-and-drop canvas with live conflict warnings, then publish to teachers and students on the web in one click.

Attendance & cover analytics

Know who's really covering, before report card season tells you.

Finding cover is only half the story. The report admins ask for next: who is losing periods to absence, who is carrying the cover load, and which periods nobody covered at all.

Cover-load fairness

Flags when one teacher is quietly carrying most of the covering burden, so it is never always the same few people.

Uncovered periods, named

The exact date, period, class, subject and teacher for every period nobody covered, so nothing slips through quietly.

Per-teacher, per-class & per-subject

Each teacher's load, absences versus excused days, periods missed, covered and taken, flipped by class and subject down to a drill-down, plus monthly and weekly trends. Attendance % counts real teaching days only and filters by manual or School ERP source.

One-click Excel export

Eight sheets: summary, per-teacher, by class, by subject, class-by-subject, uncovered periods, and monthly and weekly trends, ready to share with the board.

CBSE · ICSE · State Board

A timetable that respects your board's rules.

Periods per day, periods per subject, language and lab patterns differ by board. ZeroClash takes those as constraints, so the grid it builds is both compliant and workable.

CBSE schools

Set subject frequencies, consecutive-period limits and games or activity slots the CBSE way, then generate a balanced week for every section in seconds.

ICSE schools

Handle the wider ICSE subject spread and heavier period load with no clashes across teachers, rooms and divisions, and part-time faculty availability respected.

State Board schools

Multiple mediums of instruction, extra language periods and state-specific patterns are just rules you set once. Built for Indian schools and priced in ₹.

Read the board timetable rules

Build for free. Pay for the time you save.

Free for your first 30 days, including up to 3 timetable generations and daily substitution, the bit that saves you every single morning. After that, it moves to Pro.

Free

₹0/30 days

Free for 30 days: build with up to 3 timetable generations and daily substitution included. After 30 days, generating and editing need Pro.

Unlimited teachers, classes & subjects
Up to 15 periods per day
3 timetable generations (free for 30 days)
Daily substitution free for your first 30 days
Basic conflict detection
Watermarked PDF exports

Get Started for Free

Pro

Everything you might ask.

How does ZeroClash find a substitute when a teacher is absent?

It lists only the teachers who are genuinely free that period, ranked by subject fit and lightest cover load, with the reason shown for each. Assign in one click and the covering teacher gets an instant alert in the app, with a browser push notification too.

Does it share cover fairly between teachers?

Yes. The ranking factors in back-to-back load and who is lightest that day, so the same teachers aren't always the ones pulled in to cover.

How fast can it generate a full school timetable?

In seconds for most schools. A constraint solver places every teacher, subject and room in one pass, and very large schools simply take a little longer.

Is the timetable conflict-free across teachers, rooms and sections?

Yes. A full generation has no double-bookings across teachers, rooms or sections, and any manual override you make afterwards is flagged live.

Does ZeroClash work for CBSE, ICSE and State Board schools?

Yes. It's built for Indian schools, with multi-wing structures, sections/divisions and ₹ pricing.

Can I still make manual changes after generating?

Yes. Drag and drop on the canvas with live conflict warnings as you move things, plus Magic Fix to suggest safe slots that resolve a conflict for you.

Can teachers use it on their phones?

Yes. It's a mobile-first web app (PWA) you can add to the home screen, so the schedule is always a tap away, and cover alerts arrive as browser push notifications even when the tab is closed.

Is there a free plan?

Yes. Start free with limits on teachers, classes and daily generations, then upgrade to Pro for more scale, clean exports and priority support.

Can I see which teachers or classes lose the most periods to absence?

Yes. The analytics dashboard breaks attendance and cover down by teacher, class and subject for any date range, including a subject-within-class drill-down, a cover-load fairness view, and a list naming exactly which periods went uncovered.

Can I export attendance and cover reports?

Yes. One click exports an eight-sheet Excel workbook: summary, per-teacher, by class, by subject, class-by-subject, uncovered periods, and monthly and weekly trends.

Give your mornings back.

Let the schedule build itself, and let the next sick call sort itself out. Start free in minutes, or book a quick demo of ZeroClash by ZeroSuite.

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