A smarter investing account

Double makes it dead simple to build a portfolio
that tilts towards your hunches.

Backed by

Y CombinatorY Combinator

Build, automate and analyze a custom portfolio with ease


Start from popular indexes and ETFs.

Select a reference index like the S&P 500 or an ETF like ARKK and we will break it down into its components automatically for you to adjust as you see fit.


Create your own collections.

Build custom collections based on P/E, market cap, industry and more. Use your collections to build customized strategies weighted to your exact specifications.


Sit back and relax.

Monitor your portfolios activity feed for updates as Double takes care automatically rebalancing and tax loss harvesting when the time is right.

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Invest in what you know with Double.

Some restrictions and fees may apply.