AI-powered index builder
Build your own index fund in one sentence
Tell us what you want to invest in. We’ll pick the companies, show how they would have performed, and explain every choice in plain English.
Try:
Stocks only. Covers the US and 22 other markets including the UK, India and Japan.
- Free to explore
- See every company and why it's there
- Works with your existing broker
Top performing indices
Just shared
Top builders this month
How it works
From an idea to a ready-made list of companies in about a minute.
- 1
Describe it
Type what you want to invest in, the way you'd explain it to a friend. “Companies making AI chips”, “UK firms that pay reliable dividends”.
- 2
We build and test it
Our AI picks the companies, decides how much of each to hold, and shows how the mix would have done against the S&P 500.
- 3
Invest your way
Save it, share it, or copy it into your own broker. You stay in control: Arithmos never trades for you.
data fabric·live screens & fundamentals fan out across all sources with automatic fall-throughAttribution under nominative fair use. No endorsement or partnership implied.
Financial Modeling PrepTiingoFinnhubTwelve DataAlpha VantagePolygon.ioStooqFinancial Modeling PrepTiingoFinnhubTwelve DataAlpha VantagePolygon.ioStooq+ others
