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I lost billable hours forgetting timers. I turned my calendar into a DB

I lost billable hours forgetting timers. I turned my calendar into a DB

by sergentrif·Mar 12, 2026·3 points·2 comments
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AI Analysis

●●SolidSolve My ProblemSlickBig Brain

Turns Google Calendar events into invoices without storing your data on servers.

Strengths
  • •Privacy architecture keeps event data in your calendar, not their database.
  • •Removes timer friction by leveraging existing calendar scheduling habits.
  • •AI generates reports without guessing hours, ensuring billing accuracy.
Weaknesses
  • •Requires strict naming convention discipline which can break easily.
  • •Doesn't capture unscheduled deep work unless manually added to calendar.
Category
Productivity
Target Audience

Freelancers, consultants, fractional CTOs

Similar To

Toggl Track · Harvest · Clockify

Post Description

Hi HN, I’m Adrien. I run a dev agency and work as a fractional CTO. I lost too much billable hours simply because I forgot to start or stop a timer. It’s a friction point that fails exactly when you're most focused on deep work.

I realized my calendar was already a perfect, 100% accurate log of my week. If a meeting or a task happened, it’s in my agenda. So I built Timescanner to turn those [Client] tags in my calendar into invoices.

Why I built it this way:

- Privacy by design: your calendar is the database. We don't store your events on our servers. It’s a Google Calendar / iCal parser that keeps your data where it belongs.

- Zero new habits: if you already use your calendar to manage your day, you’re already 100% done with time tracking.

- Simplicity over complexity: it's a straightforward parser. No "AI guessing", no complex backend. No additional cognitive load.

Happy to answer any questions about how to use your calendar to track your time (and be productive)!

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