Free Tools & Worksheets

Tools to Audit Your Spend and Model Ownership

Mathematical calculators and downloadable spreadsheets to help you evaluate your software subscriptions, assess per-seat inflation, and model break-even horizons before talking to an engineer.

Downloadable Spreadsheet

SaaS Spend Audit & Workflow Worksheet (.xlsx)

A pre-configured Excel workbook designed to catalog your company's recurring software expenses. Features automated annualization formulas, per-seat cost calculations, and a clear keep/replace/build framework.

  • ✓ Real Excel formulas (`=B5*12`, `=IF(...)`, `=SUM(...)`)
  • ✓ Highlights per-seat inflation on growing teams
  • ✓ Direct input format for the Aethonex Review
Download Worksheet (.xlsx)
XLSX
Standard Spreadsheet6.6 KB • Microsoft Excel / Google Sheets
Interactive Financial Model

SaaS vs. Self-Hosted Break-Even Calculator

Client-side only • Zero tracking
Example value: £400
Linux VPS / cloud: £20
Typical upkeep: 1.5 hrs
Assumed rate: £120/hr
Workflow Pilot fee: £2,500
Timeframe: 24 months
Monthly Cost to Own
£200.00
Hosting + (hours × rate)
Monthly Difference
+£200.00
Subscription minus ongoing own cost
Estimated Break-Even
Month 13
Within 24 months
Cumulative Cost Projection (Rent vs. Own)
Rent (SaaS) Own (Self-Hosted)
Cumulative Cost Projection Line Chart comparing monthly subscription rent with upfront self-hosted build cost£0£4,800£9,600M1M12M24Break-even: Month 13

Model Assumptions & Disclaimers

  • •Subscription cost is assumed constant at £400/mo without vendor price hikes.
  • •Hosting runs on a customer-managed Linux VPS or cloud instance at £20/mo.
  • •Maintenance and dependency updates assume 1.5 hr/mo valued at £120/hr.
  • •One-off build investment is £2500 paid upfront at month 0.
  • •Calculations exclude third-party API usage fees that exist identically in both models.
  • •Figures are illustrative model outputs. Aethonex does not promise savings or a return on investment.

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