SOVEREIGN TOOLS

Offline desktop tools by Light in the Dark Solutions

No internetNo accountsNo trackingOne-time buy
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

© 2026 Spiridon Tsakonas (Cyrus Nash) — Light in the Dark Solutions — All Rights Reserved
FROM LIGHT COMES DARKNESS — AND FROM DARKNESS, THE LIGHT