Tired of switching between Postman, documentation, and code editors when testing LLM APIs? I built a solution. 🚀
🤔 The Problem
As a developer working with AI integrations, I was constantly:
- Testing Claude on different providers (Anthropic vs third-party)
- Writing the same API code over and over
- Comparing model responses manually
- Sharing configurations via screenshots 😅
✨ The Solution: LLMKit
I built a Next.js app that handles everything in one place:
| Feature | Description |
|---|---|
| 🔍 Model Database | 50+ LLM models with specs and pricing |
| ⚡ Provider Comparison | Test same model across different APIs |
| 💻 Code Generator | Auto-generate JavaScript, Python, cURL |
| 🧪 API Tester | Test directly in browser with metrics |
| 🔗 Shareable URLs | Share configs via URL parameters |
🛠️ Tech Stack
Built with modern technologies:
- Framework: Next.js 14 with App Router
- Language: TypeScript for type safety
- Styling: Tailwind CSS + Shadcn/ui components
- Theme: Professional dark/light mode with orange accents
🔥 Key Features
1. Smart Code Generation
Automatically generates production-ready API integration code in JavaScript, Python, and cURL formats. Just select your model and provider, and get copy-paste ready implementations.
2. Shareable Configurations
Share your exact testing setup via URL parameters. Perfect for team collaboration and documentation.
3. Performance Tracking
Real-time metrics including response time, token usage, and cost estimation for every API call.
📚 What I Learned
Key Insights from Building LLMKit
- Start simple - Over-engineered state management initially
- Mobile matters - More mobile users than expected
- TypeScript saves time - Caught bugs early in development
- User feedback is gold - Early testers revealed UX issues
🚧 Challenges Solved
- CORS issues → Next.js API routes as proxy
- API key security → Client-side only with warnings
- Mobile UX → Tab-based navigation for small screens
📊 Results
✅ Free to use - No signup required
✅ 50+ models supported across providers
✅ Mobile responsive - Works on any device
✅ Real-time metrics - Response time, tokens, cost
🎯 Try It Out
🔗 Live Demo: https://llmkit.cc
Perfect for:
- API developers testing integrations
- Teams comparing model performance
- Startups evaluating AI providers
- Anyone learning LLM APIs
🔮 What's Next?
- [ ] User authentication & saved configs
- [ ] Team collaboration features
- [ ] API usage analytics
- [ ] Streaming response support
Built this because I needed it. Turns out other developers did too!
What tools do you use for API testing? 👇
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