I've been using GSD extensively over the past 3 months. I previously used speckit, which I found lacking. GSD consistently gets me 95% of the way there on complex tasks. That's amazing. The last 5% is mostly "manual" testing. We've used GSD to build and launch a SaaS product including an agent-first CMS (whiteboar.it).
It's hard to say why GSD worked so much better for us than other similar frameworks, because the underlying models also improved considerably during the same period. What is clear is that it's a huge productivity boost over vanilla Claude Code.
Same. Have had great results with it. I got sick of paying FreshBooks monthly for basic income/expense tracking for Schedule C reporting and used GSD to build a macOS Swift app with Codex 5.4 and Opus 4.6. It’s working great and I am considering releasing it on the App Store. It started as a web app, but then I wanted screen capture from other windows for receipts in email or whatever. Then I wanted physical receipts, and so used Apple continuity camera. All working now in my app. And, I just added receipt auto-extract to pull salient info from and determine deduction category using Anthropic API.
Yes this is how much paying FreshBooks annoyed me. Plus I hated they forced an emailed 2FA if you didn’t connect with Google.
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