Remember why you invested.

Your portfolio shows what happened. Decision Journal helps you remember what you expected, review what you followed, and learn from the decisions behind your returns.

Built for thoughtful long-term investors

Waitlist registration opens soon. Check back for launch updates and early access.

Decision Journal · Workspace

Live

Portfolio workspace / NVDA

Live thesis

Active thesis

Buy NVDA

90-day horizon

Investment note

Revenue growth is accelerating. I expect the next earnings report to confirm demand and support the valuation.

What I expect

Outperform SPY over 90 days

What changes my mind

Growth slows or the thesis breaks

The problem

Months later, the chart is still there. Your reasoning usually isn’t.

A return alone cannot tell you whether your thesis was right, your timing was lucky, or you followed your own rules. Without that context, it’s hard to learn from a win or a loss.

How it works

Make each decision useful to your future self.

Capture your thinking

Record the reason, expected outcome, time horizon, and what would change your mind.

Review what happened

Return to your original thesis when it matters. Compare expectations with the outcome.

Find your patterns

See which rules you follow, which mistakes recur, and what your own history can teach you.

Why this exists

A note from the founder

I wanted a place to revisit the thinking that made a decision feel right—not just the number it eventually became.

Decision Journal is built to make reflection feel useful. A quiet record of your own thesis, expectations, and lessons—so experience can compound alongside your capital.

— The Decision Journal team

Coming soon

Learn from the investor you were yesterday.

Waitlist registration opens soon. Check back for launch updates and early access.

For learning and recordkeeping. Not investment advice.