Commensa

Invest alongside your friends.

A private circle where you share how your investing is going — as percentages. Nobody learns what anybody holds, or what they are worth.

How it works

  1. 1Make a circle. Send one link to your group chat. Five friends, not five hundred.
  2. 2Record what you buy and sell. Search by name, ticker or ISIN. Add a note saying why, if you want to.
  3. 3Compare the shape, not the size. Everyone's progress in percent, on the same scale — so a first Sparplan and a portfolio built over twenty years sit side by side.

What this refuses to be

  • No amounts. Ever. Not what you hold, not what you paid, not what you are worth.
  • No leaderboard on arrival. You open a circle and see what friends did, not where you rank.
  • No day-trading tooling. No candlesticks, no alerts, no notifications nagging you back.
  • No strangers. Membership comes by invite link only. No profiles, no discovery, no followers.

Why Commensa

Commensa comes from the Latin mensa, a table, and commensalis — “one who eats at the same table.”

Sharing a table has always been the plainest signal of trust. You don’t break bread with people you’re competing against.

That’s the idea here. You see what the people you trust are actually doing, and they see the same about you — always as percentages, never as amounts. Everyone starts at zero, and everybody grows together.

A personal side project. A small, private place to compare how your investing is going with friends. Built in the open, and not a commercial product.

Worth knowing, beyond what each screen already tells you:

  • Prices are end-of-day, from an unofficial source. They come from a free endpoint with no contract behind it. A price can be stale, missing, or simply wrong — and a holding that cannot be priced is left blank rather than guessed.
  • No tax and no fees, anywhere. Every figure is gross. Withholding, church tax, your Sparerpauschbetrag and your broker's charges are all absent, so nothing here will reconcile with your bank statement.
  • Every figure was typed in by hand. Nothing is imported from a broker yet, so a portfolio is only as accurate as the entries behind it — including your friends'.