Launch HN: Double (YC W24) – Index Investing with 0% Expense Ratios

Hi HN, we’re JJ and Mark, the founders of Double (https://double.finance). Double lets you invest in 50+ broad stock market indexes with 0% expense ratios. We handle all the management, including rebalancing and tax-loss harvesting—proactively selling losing stocks to potentially save on taxes—for $1/month.

Our goal is to bring the low fee trend pioneered by Robinhood to ETFs and mutual funds. We posted a Show HN about 3 months ago (

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