19 September 2026
Added an optional Gumroad subscription path alongside the existing public RSS feed. Gumroad collects the subscriber address under its own terms; Serman Tools does not maintain a separate email database.
Published four focused calculators and guides for electrical labor rate, HVAC markup versus margin, cleaning price per job and owner-operator break-even revenue per mile.
Added site-level structured data, expanded internal links and normalized Gumroad campaign parameters for the current distribution cycle. Calculations still run in the browser with no account or third-party tracker.
17 September 2026
Published eight vertical pricing guides, a guide index, structured FAQ data and direct calculator links for contractor, owner-operator, landscaping, cleaning, pest control, painting, electrical and HVAC searches.
Added a direct free-to-premium bridge for the six home-service calculators and published a new workbook link when the product became available.
Earlier foundation
Serman Tools launched with 15 browser-based calculators and the guide “How Deadhead Changes a Load.” Calculations remain client-side and require no account.
Choose your follow method
RSS requires no account or email. Gumroad provides a native subscription form on the Serman Tools profile; this site does not receive or store the address.