Developers rent API docs, monitoring, secrets and webhook plumbing by the month for side projects that earn nothing yet. Self-hosted pay-once utilities cost less than one month of the SaaS they replace.
The tool this job usually means renting is Toggl, at $10/user/mo — roughly $120 a year, every year. Timevault does the job for a one-time $79 — running on infrastructure you control.