Your data never leaves your computer. Each tool runs entirely on your own machine — no cloud, no subscription, no telemetry. You need Python 3.10+ (free). Windows and Mac: nothing else to install. Linux: one extra package (Tkinter) — the guide is in the download. Buy once, use forever.
Complete Toolkit — All Ten
Every tool below, one download
- Stock, Ledger, Lens, Invoice, Tally, Reckon, Renewal, Chain, Register, Roster
- The whole back office of a small business, offline
- €274 if bought separately — save €125
€149
Buy Complete Toolkit
Sovereign Stock
Offline inventory / stock tracker
- Import your spreadsheet, track items & value
- Search, add, edit, export
- Offline HTML reports
€19
Buy Stock
Sovereign Ledger
Offline expense / ledger tool
- Dated entries, debit/credit, running balance
- Search, add, edit, export
- Offline HTML statements
€19
Buy Ledger
Sovereign Lens
Offline CSV / log analyzer
- Ingest any CSV or log file
- Per-column stats, auto number/text detection
- Offline HTML analysis reports
€19
Buy Lens
Sovereign Invoice
Offline invoicing & unpaid tracker
- Invoices with VAT lines, totals calculated for you
- See instantly who still owes you
- Printable invoice / PDF, monthly VAT summary
€29
Buy Invoice
Sovereign Tally
Offline billable time tracker
- Start / stop timer, or type the hours
- Rate per client, earnings calculated for you
- See exactly what you have not invoiced yet
€29
Buy Tally
Sovereign Reckon
Offline quote & estimate builder
- Build quotes line by line, reuse your price list
- See your real profit margin before you send it
- Clean client quote — your costs stay private
€29
Buy Reckon
Sovereign Renewal
Offline contract & renewal watcher
- Works out the exact date you must cancel by
- Warns you before the notice window closes
- Your true annual cost, in one line
€29
Buy Renewal
Sovereign Chain
Offline service & maintenance log
- Vehicles, machines, tools — what is due and what is overdue
- Every service logged with date, cost and who did it
- Full history export — protects warranty and resale value
€29
Buy Chain
Sovereign Register
Offline member & session register
- Who paid, what they bought, how many sessions are left
- Balance updates itself every time someone attends
- See instantly who has run out or lapsed
€29
Buy Register
Sovereign Roster
Offline weekly staff rota
- Build the week shift by shift
- Hours and wage cost update as you type
- Warns you when someone is double-booked
€29
Buy Roster
Starter Bundle
Stock + Ledger + Lens together
- The three data tools: inventory, ledger, CSV analysis
- One download, one payment
- Save €18 against buying them separately
€39
Buy Bundle