Contact
Reach the person behind the calculators.
Questions, corrections, privacy requests, and partnership notes all go to the same inbox so issues can be reviewed in context.
- 01
Calculator corrections
Send formula concerns, outdated source notes, edge cases, or examples that do not match expected results.
- 02
Privacy and consent
Ask about local-first calculator behavior, analytics consent, cookies, or data handling described in the privacy policy.
- 03
Partnerships and reuse
Use the contact email for editorial questions, partnership requests, or permission questions about DigitSum content.
Helpful pages
DigitSum is operated by Jan Křenek, a self-employed entrepreneur registered in the Czech Republic. The IČO below can be checked through the Czech public business register.
- Operator
- Jan Křenek
- Registration
- IČO 17397979
- Country
- Czech Republic