tools.duitnsen.com

Tools that keep you
from being the point of failure

Two small, free tools built on the same ideas as the DuitnSen writeups: a core you never outsmart, satellites that must earn their place, and receipts for every decision you make.

Check an ETF overlap Open the decision journal
Tool 01 · Free

ETF Overlap Checker

Is that fund a genuinely different engine of return — or already inside your all-world core? One click answers the satellites test before you buy.

Check an overlap → Tool 02 · Free

Decision Journal + Portfolio Guard

Log every buy or sell before you make it. The Guard checks it against your house rules, demands a falsifier, and keeps the receipt for future-you.

Log a decision →
Built on the writeupsEach tool is the working version of a rule from the core thesis and satellites pages.
No recommendationsNothing here says buy or sell. The tools reflect your own pre-committed rules back to you.
Private by defaultThe journal saves to your own browser. Nothing you type leaves your device.
⚠ Educational only, not financial advice. These are journaling and education tools — they reflect your own pre-committed rules back to you and never recommend buying or selling any security. DuitnSen is not licensed under the Securities Commission Malaysia.