Composer was founded in 2020 by Ben Rollert, Ananda Aisola, and Ronny Li to build what they described as investing software that feels creative rather than purely functional. The company raised $16.7 million across four funding rounds from investors including First Round Capital before SoFi Technologies acquired it in 2026 to bring automated strategy trading into SoFi's own brokerage app, now marketed as Composer by SoFi.
The platform's core building block, known as a symphony, is a visual, no-code editor for assembling rules-based, hedge-fund-style trading strategies across stocks, ETFs, and options, which can then be backtested against historical data before going live with automatic rebalancing. Thousands of symphonies built by other users are shared publicly, so a new user can start from an existing strategy instead of building one from a blank canvas.
Composer suits self-directed retail investors comfortable with algorithmic, rules-based investing who want automation without writing code. Building and backtesting strategies costs nothing; the Automated Trading plan that executes strategies live costs $32/month (or $384 billed yearly), with a 14-day free trial and a separate Business Account tier for funds and institutions priced on request.
