Teacher substitution, sorted before the bell.
ZeroClash is teacher substitution software that turns the 8 a.m. sick call into fair, ranked cover in one click, then shows you exactly who covered and who is carrying the load.
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.
The timetable was never the hard part. 8 a.m. is.
Anyone can print a timetable. The hard part is a Tuesday morning when a teacher calls in sick and three classes suddenly have nobody in front of them. That is the moment this was built for.
From sick call to covered, before the first bell.
Here is the same 8 a.m. absence, the old way and the ZeroClash way. Scroll through the morning.
The sick call comes in.
A teacher messages the office: down with a fever, not coming in. Three periods across two classes now have nobody at the front of the room, and the first bell is minutes away.
The old way: ring round and hope.
Someone scans a printed staff list, guesses who might be free, and starts ringing round on WhatsApp. It is slow, it is stressful, and it quietly dumps cover on the same few helpful teachers every time.
Ranked, fair cover in one click.
Mark the teacher absent and ZeroClash lists only the teachers genuinely free that period, ranked by subject fit and lightest cover load, each with the reason it was picked. Assign the top one in a single click.
The covering teacher is alerted.
The teacher you assigned gets an instant in-app alert and a browser push: which period, which class, which subject, and who they are covering for. Sorted, before the bell.
Retire the staff list, the WhatsApp round and the spreadsheet.
The manual scramble is not just slow. It quietly overloads your most willing teachers and leaves gaps nobody notices until parents do. With ZeroClash, every suggestion is transparent about its reason, and fairness is built into the ranking.
Printed list · WhatsApp · a shared spreadsheet
- Scan a printed staff list and guess who is free
- Ring round on WhatsApp while the bell rings
- The same few helpful teachers cover again and again
- No record of who was actually asked or assigned
- Uncovered periods slip through unnoticed
- No idea who is quietly losing the most teaching time
Mark absent · ranked cover · one click · alerted
- Only teachers genuinely free that period are shown
- Ranked by subject fit and lightest cover load
- Fair rotation spreads cover across the staff room
- Every assignment logged, with an instant alert sent
- Uncovered periods named by date, class and subject
- Cover-load and absence analytics for any date range
New to arranging cover fairly? Read our guide on how to arrange teacher cover.
Know who's really covering.
Finding cover is only half the story. This is the report admins ask for next: who is quietly carrying the load, who keeps losing teaching time to absence, and exactly which periods nobody covered.
Cover-load fairness
Flags when one teacher is quietly carrying most of the covering burden, so it is never always the same few people.
Cover load · this week
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
Every teacher's scheduled load, days absent versus days excused, periods missed, covered, uncovered and taken, with one attendance % that means what it says. Then flip the same numbers by class and by subject, down to a subject-within-class drill-down.
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.
Made for CBSE, ICSE and State Board schools.
Wings, sections & divisions
Primary to Senior, with multiple sections and divisions, so cover respects who really teaches where.
₹ pricing, no install
India-priced plans and a web app that runs on any device. Nothing to deploy on school computers.
Optional absence sync
Pair it with ZeroSuite School ERP and a staff leave marked there flows straight into cover.
One half of ZeroClash
Cover reads straight off your live schedule, the other half of ZeroClash timetabling.
Teacher substitution software, answered.
What is teacher substitution software?
It is software that arranges cover when a teacher is absent. Mark the teacher out and it finds the staff genuinely free that period, ranks them by subject fit and a fair cover load, assigns the cover in one click, and alerts whoever picks it up. It replaces the printed staff list and the morning round of phone calls.
How does ZeroClash arrange cover when a teacher calls in sick?
Mark the teacher absent, whether it is a full day, a late arrival or an early leave, and it builds a cover task for every affected period, then lists only the teachers actually free at that hour, ranked by subject fit and lightest load. It re-checks each pick before you assign, so you never hand someone a clash.
How does it keep cover fair between teachers?
The ranking weighs who is lightest that day and back-to-back load, so cover is spread across the whole staff room instead of always landing on the same willing few.
Will the covering teacher know they have been assigned?
Yes. The moment you assign, they get an in-app alert and a browser push notification naming the period, class, subject and who they are covering for. It is a browser push, not a native phone lock-screen notification.
Can I see who is carrying the most cover load?
Yes. The analytics dashboard shows cover load per teacher and flags when one person is quietly absorbing most of the covering, alongside per-class and per-subject breakdowns for any date range.
What happens to periods nobody could cover?
They are never lost. An uncovered-periods list names the exact date, period, class, subject and absent teacher, so gaps stay visible instead of silently slipping through.
Does it work for CBSE, ICSE and State Board schools?
Yes. It is built for Indian schools with multiple wings, sections and divisions, and it is priced in ₹.
Can teachers pick up cover details on their phones?
Yes. It is a mobile-first web app (PWA) you can add to the home screen, and cover alerts arrive as browser push notifications even when the tab is closed.
Does it connect to our school attendance or ERP system?
By default an admin marks a teacher absent in one click. Optionally it syncs daily staff absences from ZeroSuite School ERP, so a leave marked there flows straight into the cover workflow.
Is there a free plan, and how is it priced?
Yes. Start free with limits on teachers, classes and daily use, then upgrade to Pro in ₹ for more scale, clean Excel exports and priority support.
Sort the next sick call before the bell.
Set up ZeroClash in minutes and let the next 8 a.m. absence arrange its own fair cover. Start free, or talk to us about your school.