Double

For retail investors who want more control than a standard index fund offers, Double was a brokerage app for building and managing customized stock portfolios. Users could start with a prebuilt direct-indexing strategy, such as an S&P 500 portfolio, or use stock and ETF screeners to create a basket and check how it performed historically. They could adjust holdings and weightings, tilt toward sectors or themes, or exclude specific stocks—for example, to reduce exposure to an employer’s shares. Double automated portfolio investing and rebalancing, with tax-aware trading and tax-loss harvesting available for eligible accounts. It was designed for investors who wanted a personalized, actively adjustable portfolio without managing every trade themselves. Double shut down in August 2025, so the service is no longer operating.

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