People quite like aider! I’m not as much of a fan of the CLI workflow but it’s quite comparable, I think.
Open source power vs corp - if you are eager to do some stuff yourself, aider is probably a better pick (or even a strategic investment); otherwise you'll simply find much more tools that don't require setting them up in Cline/Claude Code
But man, if you're on ycombinator.com, how not to stick with open source?