Web Application

Double

Double Finance was a Y Combinator-backed fintech startup that built an investment platform for retail investors. The company was founded in 2023 and was headquartered in San Francisco.

Tech Stack

Next.jsTailwind CSSShadcn
TimelineAug - Dec 2024
RoleFrontend
ClientUpwork
StatusClosed
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Core Product:

Double allowed anyone to build a custom ETF, test its performance, and automate its trading. They offered direct indexing strategies with tax optimization and cash management tools, all with zero AUM (assets under management) fees—a significant differentiator since traditional financial advisors typically charge around 1% annually for similar services.

Key Features:

  • Custom stock index design across 20+ ETFs
  • Daily tax optimization and rebalancing
  • Tax-loss harvesting capabilities
  • Ability to tilt portfolios toward specific sectors, industries, or themes
  • Pre-built strategies