Quick comparison
| Need | Excel spreadsheet | RetainerMeter |
|---|---|---|
| Custom calculations | Highly flexible; you build and maintain formulas | Retainer and additional-hours calculations are built in |
| Monthly burn visibility | Possible with formulas, tables, and charts you design | Live burn cards show usage, remaining hours, and pace |
| Time entry | Any layout you choose | Weekly, keyboard-friendly client grid |
| Invoice preparation | Usually needs a template or separate invoice tool | Connected preview with PDF and HTML export |
| Sent invoice history | Depends on your versioning and file process | Exported invoice snapshots and status are retained |
| Local control | Local if saved locally; cloud if stored in a cloud service | Normal app and client data is stored locally |
| Collaboration | Strong when using Microsoft 365 sharing | Designed primarily for one local operator, not live team collaboration |
| Cost | Depends on your existing Microsoft licence and setup time | $129 one-time after the trial; optional $9/month updates plan |
When Excel is still the better choice
Stay with Excel when your workflow is simple, your spreadsheet is reliable, and you are comfortable owning the formulas and file process. It is also a better fit when the work requires unusual calculations that no dedicated app supports, or when several people need to collaborate through an existing Microsoft 365 environment.
A spreadsheet can be a perfectly adequate retainer tracker for one or two clients. A simple table with date, client, hours, allowance, and remaining balance may be all you need. There is no benefit in replacing a workflow that is clear, quick, and dependable merely because a specialised tool exists.
Where spreadsheet retainer tracking starts to strain
The cost of Excel is not only the licence. It is the repeated attention needed to keep the workbook trustworthy. Formulas must cover new rows. Client rates and allowances must point to the correct period. Invoice numbers and exported files need a naming and versioning convention. A chart can show burn, but somebody must ensure its source range remains correct.
Problems often appear during exceptions: approved work recorded after an invoice was sent, an edited historic time entry, a different rate for additional hours, multiple clients with different billing models, or a request to explain how an invoice total was reached. A custom workbook can handle all of these, but every exception makes it more like software you maintain yourself.
What RetainerMeter standardises
RetainerMeter provides a fixed workflow for client terms, weekly hours, burn calculations, billing preview, invoice export, and payment status. It calculates the retainer position from the same records used by the billing view. Exported invoices are preserved so later time corrections do not silently rewrite what the client received.
That standardisation is the benefit and the limitation. You spend less time maintaining formulas and connecting files, but you work within the billing models RetainerMeter supports: hourly, flat monthly retainer, and retainer with additional billable hours.
Both approaches can keep data local
Excel files can stay on your computer if you save them locally, and they can be cloud-hosted if you use OneDrive or another storage service. RetainerMeter stores normal client and app data locally by design. In either case, local storage requires sensible device security and a backup routine.
A practical decision rule
Try RetainerMeter when you repeatedly reconcile time, allowance, burn, additional charges, and invoice files—or when you cannot tell where every client retainer stands without checking formulas.
How to move from a spreadsheet
- Keep the original workbook as a read-only historical archive.
- Confirm each active client's current billing model, fee, allowance, and additional-hours rate.
- Start at a clean billing-period boundary where possible.
- Enter active clients and opening terms in RetainerMeter.
- Run one billing cycle in parallel before retiring the working spreadsheet.
- Export a local backup and decide where protected backups will live.
Do not copy inconsistent historical data merely for completeness. The goal is a clean operational starting point with the old records still available for reference.
Excel and Microsoft 365 are Microsoft products. RetainerMeter is not affiliated with or endorsed by Microsoft.