Double – Design and invest in your own stock index
Hey everyone, we’re JJ and Mark from Double (https://double.finance). Over the past few months we’ve been working on an investing app that lets anyone design and invest in their own stock index. Start by picking one or more strategies. You can find 20+ starting points in Double that vary from direct index versions of classic ETFs (like SPY) to strategies focused on specific industries, market trends, or themes (like YC public companies). You can also easily build your own grouping of stocks, and tilt your strategy towards or away from certain stocks or sectors. Once you’ve chosen…
Double – Design and invest in your own stock index launched on August 14, 2024 with 178 votes, #288 of 5,471 launches that month and more than 95% of that year's launches.
In plain words
Double is an investing app that lets users design and invest in custom stock indexes. It offers over 20 pre-built strategies ranging from direct index versions of classic ETFs to themed portfolios focused on industries or trends, plus the ability to build entirely custom stock groupings. The app handles daily portfolio optimization, automatically managing trades while accounting for taxes and trading costs, and enables tax loss harvesting for sufficiently diversified accounts.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey everyone, we’re JJ and Mark from Double (https://double.finance). Over the past few months we’ve been working on an investing app that lets anyone design and invest in their own stock index. Start by picking one or more strategies. You can find 20+ starting points in Double that vary from direct index…
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