| What it does | AI prompt generator with 500+ templates for ChatGPT, Claude, and Gemini
| A harness-agnostic framework for AI coding tools
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| Pricing model | Freemium
| Open source
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| Pricing | Free (2 daily prompt generations, access to free tools, basic prompt frameworks); Pro at $19/month (unlimited prompt improvements, full prompt vault access, GPM Chrome Extension, all frameworks, optimal model suggestions); Lifetime Access at $49 one-time (lifetime access to pro features, no monthly
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| Key features | - CO-STAR Framework for marketing and copywriting
- RISEN Framework for coding and reasoning
- CRAFT Framework for business operations
- 500+ prompt templates across 20+ categories
- GPM Chrome Extension for ChatGPT, Claude, Gemini, and Perplexity
- Free AI Prompt Scorer tool
- AI Content Checker tool
- Prompt vault to save and edit prompts
- Model-agnostic prompts work across multiple AI platforms
- Team sharing capabilities on paid plans
| - Configure plugins, skills, MCP servers, and hooks in a single harness.yaml file
- Observatory: monitor every session, tool call, and minute of activity
- Memory: persistent knowledge graph for AI orientation
- Comparator: run prompts across Claude Code, Cursor, and Copilot side by side
- Import existing configs from multiple AI coding tools automatically
- Share complete setup via single file with teammates
- Harness Parity: verify all connected AI tools end up with identical configuration
- Cross-harness compatibility table showing actual tool capabilities
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| What makes it different | - Uses proven prompt engineering frameworks to eliminate generic AI responses and reduce hallucinations
- Curated library of 500+ battle-tested templates ready to use
- Works seamlessly across ChatGPT, Claude, Gemini, Copilot, and Perplexity
- Chrome Extension with Improve button for instant prompt transformation
- Free tools available with no credit card required
| - Import-first approach: reads existing configs from all your tools and converges them before you write YAML
- No marketing gloss: capability table generated at build time from actual adapter code, not hand-maintained
- Portable across tools: single harness.yaml travels with you to every machine and tool
- Open source and free: no cost beyond existing Claude subscription
- Based on open specification: Harness Protocol is vendor-neutral and JSON Schema validated
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| Open source | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 6 ● no change since last check | 16 ● no change since last check |
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| Trust Flow (Majestic) | 9 | 0 |
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| Citation Flow (Majestic) | 28 | 20 |
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| Referring domains (Majestic) | 64 | 11 |
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GPTPromptMaker
Harness Kit