The conveyor went down — its quarterly PM was five weeks overdue. The interval was known, the date was sitting in the maintenance sheet. Nobody just looked in time. A day of downtime costs more than any service visit.
That's how the expensive failures happen: not because the schedule is missing, but because nobody got reminded. Before you roll out a heavy maintenance system, it's worth asking what PM schedule software actually has to do — and how lean the answer can be.
What to look for in PM scheduling
Not everyone needs the same thing. This checklist helps place your need — including the spreadsheet you may already be running:
| What you need | Spreadsheet | Full CMMS | CellAlert |
|---|---|---|---|
| PM dates in one view | ✓ (manual) | ✓ | ✓ |
| Reminders when the file is closed | — | ✓ | ✓ |
| Recurring schedules roll forward | — | ✓ | ✓ |
| Visible to the whole team | — | ✓ | ✓ |
| No migration, on your existing Excel | ✓ | — | ✓ |
| Work orders, parts, technician dispatch | — | ✓ | — |
The honest read: if you need work orders, spare-parts inventory and dispatch, a full CMMS is the right tool. If you mostly lose track of PM dates and already keep assets in Excel, a heavy system is overkill — you just need the reliable reminder on top.
Every PM date in one view
The first job: each asset with its next PM date and a traffic-light status — overdue, due soon, on track:
Recurring by design: done doesn't mean gone
PM repeats. The moment one service is marked done, the next has to roll forward by the interval. This is exactly where a hand-kept sheet breaks: one rollover gets forgotten, and the asset slips through.
"Don't I need a real CMMS for this?"
Depends on where your pain is. If it's work orders, parts and technician dispatch — yes, a CMMS is the right call. But if you mostly lose track of dates and already keep assets in Excel, a heavy system solves a problem you don't have and adds new ones: migration, training, upkeep. A calendar reminder, on the other hand, only covers one fixed date, doesn't roll recurring PMs forward, and dies in one person's inbox.
What CellAlert does here
You mark the cell with the next PM date once in the Excel add-in and set the interval; a click on "Refresh" later pulls in changed dates. CellAlert monitors the deadline server-side and reminds the whole team in time — by email and in your calendar — even when Excel is long closed. After you check it off, the next PM rolls forward automatically.
And on trust — the first question most teams ask: CellAlert doesn't store your spreadsheet, only the deadline plus a cell reference. Your data stays yours: CSV export anytime, no lock-in.
Frequently asked questions
What's the difference between PM schedule software and a CMMS?
A CMMS manages the whole maintenance operation: work orders, parts, technicians, history. A lean PM scheduler like CellAlert focuses on what most teams actually drop — the dates: keeping recurring PMs in view and reminding the right people in time, without a new system.
Do I have to move my assets out of Excel?
No. CellAlert sits on top of your existing spreadsheet — you mark the PM date cells and it adds the schedule and reminder layer. No migration, CSV export anytime.
How are recurring PMs handled?
You set the interval once (monthly, quarterly, annual …). When you mark a PM done, the next one rolls forward automatically — no manual re-entry, no forgotten follow-up.
Is my spreadsheet stored in the cloud?
No. CellAlert stores only the deadline metadata plus a cell reference — not the file itself. Your data stays yours, with CSV export anytime and no lock-in. Your Excel sheet stays the source of truth.
A PM schedule is only as good as the reminder behind it. See how to keep a full asset list under control in Stop managing a list of deadlines — think in a matrix, or how a single cell becomes a monitored deadline in How to set a date reminder in Excel.