Build AI tools people can use instantly
Write a prompt or connect an API. We generate the UI, handle users, analytics, and distribution. You just build.
Two ways to build
Choose the approach that fits your use case. Both get the same UI, analytics, and distribution.
AI-Powered
Write a system prompt. Pick a provider (Gemini, Groq, or OpenRouter). We handle the rest — no API needed.
Example prompt
You are a professional summarizer. Given any text, produce: 1. A 2-3 sentence summary 2. The word count of the summary Be concise. Never add opinions.
External API
Already have an API? Paste the endpoint URL. We proxy requests to it. Add auth headers if your API requires them.
Your API just needs
POST https://your-api.com/run
Accept JSON input, return JSON output.
Three steps to launch
Describe your tool
Give it a name, tagline, and description. Define your input and output fields — text, numbers, or long-form content.
Choose execution mode
AI-powered: pick a provider + write a system prompt. External API: paste your endpoint URL and optional auth headers.
Test & publish
Run your tool live in the wizard, see the exact output users will get, then publish with one click.
What you get
Everything a tool needs to succeed — built in from day one.
Two ways to build
Write a system prompt and let AI do the work, or connect your own API endpoint. Both modes get a full UI automatically.
Automatic versioning
Every time you update your system prompt, we snapshot the old version. Roll back anytime from your dashboard.
Built-in analytics
See how your tools are performing — usage over time, error rates, average response time, and user ratings.
Public API access
Every tool gets a REST endpoint. Users can generate API keys and call your tool programmatically from any app.
Tool chaining
Users can pipe the output of one tool into another. Your tool becomes part of a larger AI workflow.
Secure by default
Auth headers are stored encrypted and never exposed in public API responses. Your API keys stay safe.
Public API
Every tool you publish gets a REST API endpoint. Users call it with their own API keys.
Request
curl -X POST https://buildly.click/api/v1/tools/summarize/run \
-H "Authorization: Bearer bld_your_key" \
-H "Content-Type: application/json" \
-d '{"input": {"text": "Long article..."}}'Response
{
"output": {
"summary": "A concise summary of the article.",
"word_count": 42
},
"durationMs": 1230
}Common questions
Do I need to upload code?
No. You either write a system prompt (AI-powered mode) or paste an API endpoint URL (external API mode). No code is uploaded or stored on Buildly.
What AI providers are supported?
Gemini, Groq, and OpenRouter. We handle API calls, rate limiting, and fallbacks automatically.
Is my API key / auth header secure?
Yes. Auth headers are stored securely and never exposed in public API responses or to end users.
Can I update my tool after publishing?
Absolutely. Edit name, description, inputs, outputs, or your system prompt anytime from the developer dashboard. Prompt changes are versioned automatically.
How do users find my tool?
Your tool appears on the Explore page immediately. Users can search, filter by category, and sort by rating or usage.
What does it cost?
Free to build and publish. Users get 20 free runs per day. We handle infrastructure and AI costs.