Jasper

Build me a personal marketing-copy generator to replace Jasper. Requirements: - A local web app: Node + Express + better-sqlite3 on localhost:4850, plain server-rendered forms, no frontend framework. - A brand/ folder of Markdown files: voice.md (tone rules, banned words), audience.md, product.md. Every generation prepends these to the prompt automatically. - Template library in SQLite: blog outline, landing-page hero, product description, cold email, tweet thread. Each template is a prompt with {{variables}} filled in from a small form. - Calls the Anthropic or OpenAI API (key and model name in .env), streams into the page, and always produces 3 variants side by side. - Every output saved with template, inputs, chosen variant, and a campaign label; past outputs browsable and searchable by campaign. - A rewrite box: paste any draft, get it back in my brand voice. - Everything stays on my machine except the LLM calls. No accounts, no telemetry. - Out of scope: team collaboration, approval workflows, and multi-writer brand governance. This is a one-person tool. - README: .env keys and how to tune the brand files, that is where the quality lives.