Best freelance proposal tool for solo founders

There are roughly 40-50 proposal and contract tools on the market today (Proposify, PandaDoc, HoneyBook, Bonsai, etc.), but the vast majority target agencies, small teams, or B2B enterprises with complex workflows. The gap for solo founders is real: existing tools are bloated with features like approval workflows, team collaboration, and multi-tier permissions that a solo founder doesn't need and won't pay for. Solo founders instead suffer through either overpriced enterprise solutions or building proposals in Google Docs and Canva. The real pain isn't the templating—it's the lack of tools that let a founder inject personality, close faster, and integrate with their actual revenue tools (Stripe, Gumroad, Wave). The opportunity isn't in being another generic proposal builder; it's in being the fastest way for a solo founder to turn a client conversation into a signed deal, with built-in payment collection and zero friction. A new entrant should focus hard on three things: (1) one-click proposal generation from a brief description or conversation notes, (2) embedded payment acceptance so clients sign and pay in the same flow, and (3) deep integrations with tools solo founders already use (Slack, email, invoicing platforms).