ZeroClash: school timetable and teacher substitution app Teacher absent? Substitution sorted in a few taps.
ZeroClash builds your school timetable and shows who is free when a teacher is away. Assign the substitute, and the teacher gets it on their phone.
Free for 30 days. No card needed.
Three taps, and every class has a substitute.
A teacher calls in sick at 7:52. Mark them absent, pick from the teachers who are really free, and you are done before the bell.
Mark who is absent
Full day, late, or leaving early.
See who is free
Only teachers free that period, best pick first, shared fairly.
They get it on their phone
The office sees when they have seen it.
The office, in ZeroClash
Anita's WhatsApp
- 1The office taps Assign
- 2Anita gets it on WhatsApp
- 3She taps Seen, the office sees it
More on teacher substitution software
The substitution message goes on WhatsApp.
The teacher taps Seen, so the office knows. Fewer morning calls.
₹249 a month, on top of your plan
1,000 WhatsApp messages a month.
Your whole school timetable, built for you.
No clashes for teachers, rooms or sections. Change anything by hand and it warns you straight away.
- 1Set your rules
- 2Build
- 3Make it final
Wings and sections
Primary to senior, every section, one timetable.
CBSE, ICSE and State Board
Periods, labs and languages your board's way. Board rules
Substitution reports
Who substituted most, which periods were missed, in Excel.
Simple prices.
Start free for 30 days. Pay monthly or yearly.
Free trial
- 2 timetable builds
- Daily substitution included
- No card needed
Pro
- Up to 25 teachers
- Up to 2 wings
- Daily substitution included
Premium
- Any number of teachers and wings
- Everything in Pro
- Staffroom TV board and substitution reports
Cheaper tools can find a free teacher. ZeroClash also shows you she has seen it.
- Seen tick on substitution
- Substitution on WhatsApp
- Real help from Mumbai
WhatsApp add-on
Substitution messages go to teachers on WhatsApp. 1,000 messages a month, on top of any plan.
Prices in ₹, no extra GST. Two months free on yearly plans.
Questions schools ask.
Is there a free plan?
Yes. ZeroClash is free for 30 days, including 2 timetable builds and daily substitution, with no card needed. After that your timetables stay viewable and exportable. Pro is ₹499 a month or ₹4,990 a year for up to 25 teachers and 2 wings, and Premium is ₹899 a month or ₹8,990 a year for unlimited teachers and wings.
Can the substitution message go on WhatsApp?
Yes, with the WhatsApp add-on at ₹249 a month. The substitute teacher gets the substitution message on WhatsApp and taps Seen, so the office knows they got it. Teachers can also ask for leave on WhatsApp, and the office can approve it there. Each teacher connects their own WhatsApp once.
Can teachers use it on their phones?
Yes. Teachers see their day and their substitutions on the ZeroClash Android app or the website, and get an alert when they are given a substitution.
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 substitution load, with the reason shown for each. Assign in one tap and the substitute teacher gets an alert on their phone.
Does it share substitutions 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 substitute.
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 change 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 see which teachers or classes lose the most periods to absence?
Yes, on Premium. Substitution reports break attendance and substitutions down by teacher, class and subject for any date range, show who is carrying the substitution load, and name exactly which periods had no substitute.
Can I export attendance and substitution reports?
Yes. One click exports an Excel workbook with the summary, per-teacher, by class, by subject, periods with no substitute, and monthly and weekly trends.
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Part of ZeroSuite, with School ERP and HRMS.