Hey everyone, Karthik here :)

“This should take 30 minutes.”

An hour later, I’m still working. Somehow, tomorrow’s plan assumes it’ll take 30 minutes again.

That’s the habit behind Personal Planner.

I like planning my days, but I also want to look back and understand them. What did I finish? What took longer than expected? What should I give more room to next time?

So I built a planner that keeps the plan and what actually happened together:

• Give tasks a place on your daily timeline.
• Start a timer while you work.
• Compare your estimates with the time you recorded.
• Review your day or week and write down what you’d change.

A checked box tells me I finished something. Seeing that it took twice as long helps me plan the next one.

There’s also an inbox, recurring tasks, templates and Experiments for trying routines over time. But that plan → track → reflect loop is the reason I built it.

Personal Planner is free and open source, with no subscriptions or paid feature tiers. It runs on Windows, macOS, Linux and Android. Local use works offline without an account. Optional cross-device sync uses your own Supabase project and requires setup.

This is my first independently released app, and I use it myself.

If this sounds familiar, try it with one real task today. Estimate how long it’ll take, run the timer and compare the result. You don’t need to move your whole routine over to see whether it helps.

The demo above shows the workflow, and the website has downloads and installation steps.

If you give it a try, I’d love to hear:) and did the comparison help you decide what to change in your next plan?

Thanks for taking a look! Have a great day

Karthik