Five offline apps for people building apps with Lovable, Bolt, Cursor or Claude Code. Each one is shown running below (real app, demo data). Spec your app before you vibe code it, teach your AI a job once with a skill, brief agents so they stop at the right moment, keep your best prompts as templates, and make AI-drafted writing sound like you.

• Plainspoken ($7 alone): Make AI-drafted writing read like you wrote it.
• Blueprint ($9 alone): Turn an app idea into the spec that keeps Lovable, Bolt, Cursor or Claude Code on track.
• Skillsmith ($7 alone): Build a valid Claude skill (SKILL.md plus an upload-ready zip) by answering six plain-English questions.
• Handoff ($8 alone): Give an AI agent a brief it cannot misread: the goal, the forbidden list, and when to stop and ask.
• Promptbook ($6 alone): Keep your best prompts as fill-in-the-blank templates and copy them anywhere in one click.

$29 once for all five ($37 bought one by one). Every app is a single file that runs in your browser on Windows or Mac, offline. No account, no subscription, and no AI runs inside: they build the prompts, specs and files you paste into your own ChatGPT, Claude or Gemini, so there is no API key and nothing to pay per use.

Who it's for: people building apps with Lovable, Bolt, Cursor or Claude Code.

Each app comes with a quick-start guide. Questions? Reply to your receipt email.

Who made this

Matt Busel, AI Engineer @ Tensorust. I built 21 iOS apps from a Windows PC, a Steam game, and an AI agent team that runs my outreach in public, failures included.

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8 iOS apps live on the App Store (21 uploaded from Windows)

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5.4K LinkedIn followers

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517 GitHub stars

Live things I built

• O'BLOCK on Steam (out Oct 20)
• Chain: Habit Tracker
• Ironbook: Workout Log
• Live receipts: what the agents did today
• Code on GitHub

What is in it (5)

• Plainspoken ($7 alone)
• Blueprint ($9 alone)
• Skillsmith ($7 alone)
• Handoff ($8 alone)
• Promptbook ($6 alone)