# Marcobics

> Free browser tools and paid spreadsheet/data files. The tools are genuinely free and need no account; the files are one-off purchases on Gumroad.

## Free tools

- [Free Annual Budget Planner](https://marcobics.pages.dev/tools/annual-budget-planner/): Twelve months in the browser, the totals done for you, and a CSV you can keep.
- [Free Backlink Checker](https://marcobics.pages.dev/tools/backlink-checker/): Up to 100 referring domains, ranked by authority, from the public Common Crawl web graph. No account, no API key, no daily limit.
- [Break-Even Calculator](https://marcobics.pages.dev/tools/break-even-calculator/): The one number a business plan is actually for: how many you have to sell before you stop losing money.
- [City Data Lookup](https://marcobics.pages.dev/tools/city-lookup/): Population, coordinates and IANA time zone for 34,135 cities. Search one, copy the row.
- [Expired Domain Checker](https://marcobics.pages.dev/tools/expired-domain-checker/): Qualified referring domains, computed from the Common Crawl web graph. No account, no card, no limit.

## Paid files

- [The Business Plan Playbook](https://marcobics.gumroad.com/l/the-business-plan-playbook): EUR 79.00, one-off
- [The Expired Domain Field Guide: 15 Checks That Rejected 45%](https://marcobics.gumroad.com/l/the-expired-domain-field-guide): EUR 23.00, one-off
- [World Cities Database — 34.135 città, 244 paesi](https://marcobics.gumroad.com/l/world-cities-database-34-135-citta-244-paesi): EUR 12.00, one-off
- [Annual Budget Planner — 14 Sheets for Excel & Google Sheets](https://marcobics.gumroad.com/l/budget-planner-annuale): EUR 6.00, one-off

## Notes

- The expired domain checker computes qualified referring domains from the public Common Crawl web graph. Domains with fewer than 20 qualified referring domains are not in the shipped slice, and the tool says so rather than guessing.
- No tracking, no cookies, no analytics scripts on any page.