Reminders straight from your spreadsheet
Nevermiss adeadline.
CellAlert turns a date in your Excel sheet into a monitored deadline — and reminds you in time. Even when Excel is closed.
Somewhere in your spreadsheets.
Never miss a deadline.
Lose the file — the deadline stays.
Sound familiar?
Missing a deadline can get expensive.
Missed = liability
A missed inspection or maintenance deadline can mean liability, fines or downtime in the worst case.
Excel doesn't remind you
Your spreadsheet won't tell you what's due next. You have to remember yourself — and that's exactly what slips in daily work.
No proof for the audit
Who reacted, and when? Without a complete trail, the audit turns into a search.
CellAlert solves exactly this — without giving up your Excel.
It's this simple
No migration. No new system.
You keep your Excel sheet. CellAlert just sits on top — ready in three steps.
Mark
Mark a cell with a date as a deadline in the Excel add-in — one click.
Get reminded
CellAlert reminds you automatically by email and in your calendar — even when Excel is long closed.
Prove it
Who confirmed what and when — a complete trail for every audit.
Excel stays the source of truth. You don't switch to anything new.
Why CellAlert
Excel stays the source of truth
With you everywhere
Stop keeping it in your head. The deadline finds you.
Your dates stay where they live today — in Excel, LibreOffice or FileMaker. But they are available everywhere: in your inbox, in your calendar, in the app. At your desk, in the workshop, on the road.
The reminder lands in your inbox in time — not once things are already on fire.
Calendar
As a subscription in Outlook, Google and Apple — where your day gets planned anyway.
Mobile app
Every deadline in your pocket — in the workshop or on the road.
Web app
In the browser on any computer — nothing to install.
Your dates stay where they are:Microsoft Excel · LibreOffice Calc · Claris FileMakerSee all integrations →
All under control
Features that make the difference day to day
Priority
Critical, normal or low. Critical deadlines remind daily until someone confirms — nothing important falls through.
Filter & search
Filter by object, status or category. Overdue, this week, on track — at a glance.
Responsibles & team
Assign owners, remind multiple people, set a group mailbox. Everyone knows what to do.
Recurring deadlines
Set inspection intervals once — the next deadline rolls forward automatically. No manual re-entry.
Email, calendar & app
Reminders by email, a calendar subscription for Outlook, Google and Apple — and every deadline in the app on your phone. Right where you already look.
Complete trail
Created, changed, confirmed, completed — who/what/when. The proof audits ask for.
Shared across the team
All deadlines belong to the organization, not one person. If someone is out, the team still sees everything — nothing hinges on a single inbox.
Hosted in Germany.
Servers in Frankfurt, GDPR-compliant. And data-minimal: we store only the deadline — not your Excel file.
More in the privacy policy →- Hosting in the EU (Frankfurt)
- GDPR-compliant
- Only metadata, never your file
Pricing
Clear. Monthly. Cancel anytime.
All prices net, plus VAT.
Starter
Founder price
39 € regular
up to 2 seats
For small teams starting to secure their deadlines.
Includes
- Monitor deadlines across multiple Excel files
- Email reminders — even when Excel is closed
- Priorities, filters & complete trail
Professional
PopularFounder price
79 € regular
up to 8 seats
For firms where a missed deadline means liability.
Everything in Starter, plus
- Assign responsibles
- Calendar subscription (Outlook · Google · Apple)
Business
Founder price
149 € regular
up to 20 seats
For larger teams managing deadlines centrally.
Everything in Professional, plus
- For larger teams & multiple departments
- Priority support
Individual
Unlimited seats
For large organizations with many users — priced to fit.
Everything in Business, plus
- Custom billing & contract
- Personal onboarding
- Dedicated contact