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About Puter.js
What is Puter.js?
Puter.js is a revolutionary serverless, keyless JavaScript SDK that provides a safe, production-ready backend for AI-built apps. It bundles auth, cloud storage, a serverless NoSQL database, serverless workers, and an AI Gateway with access to 500+ models—all from a single script tag. Built on the open-source Puter platform, it lets developers ship full-stack apps with just a prompt, eliminating the need for API keys, server provisioning, or complex boilerplate.
Who is it for?
Puter.js is ideal for developers and teams building AI-generated applications using coding agents like GitHub Copilot, Cursor, or similar tools. It's also perfect for indie hackers and startups who want to rapidly prototype and deploy scalable apps without worrying about backend infrastructure. If you're a developer who wants to focus on frontend logic and let the backend handle itself, Puter.js is for you. It's not designed for developers who need fine-grained control over their backend infrastructure or who prefer traditional server-based architectures.
Key benefits and use cases
Puter.js solves the common problem of AI coding agents struggling with backend integration. With a small, consistent syntax that LLMs use correctly every time, it reduces AI tokens, code size, and errors by up to 90%, 12x, and 97% respectively. Real use cases include building to-do list apps, chat applications, content management systems, or any full-stack app that requires user authentication, data storage, and AI-powered features—all in a single generation pass.
Its User-Pays model means developers pay $0 for infrastructure, regardless of user count. Every user brings their own storage, database, and AI allowance, making it a cost-effective choice for scaling from zero to millions of users without monthly bills.
Key features
- AI Gateway — Access 500+ models from OpenAI, Claude, Gemini, Grok, and more with a single API call.
- Auth — Built-in user authentication with no API keys to manage; every request is authenticated and scoped to the signed-in user.
- Storage — Cloud storage for files and assets, included by default.
- Database — Serverless NoSQL database, ready instantly with zero setup.
- Serverless Workers — Run backend logic on demand with no infrastructure to manage.
- Networking — Built-in networking capabilities to handle real-time communication.
- Keyless & Serverless by Design — No API keys to leak or rotate; fully serverless architecture that scales automatically.
SaaSpartout Score
8.0
/10
Editorial score from our review methodology — not user ratings.
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Puter.js Pricing
Puter.js pricing: $0 for developers.
For comparison: the median starting price in Developer Tools is $19.99/month, measured across 301 tools we track. See the full SaaS Pricing Index →
User-Pays Model (Free for Developers)
Puter.js charges developers $0 for infrastructure at any scale. Every user covers their own storage, database, and AI usage through their own Puter account. Each user gets a free allowance of these resources; heavy users can top up by paying Puter directly. There are no API keys, no rate limits, no captchas, and no fraud systems. Your monthly invoice is $0 even with a million users.
Frequently asked questions
Is Puter.js free?
Yes, Puter.js is free for developers. The User-Pays model means you pay nothing for infrastructure, regardless of user count. Your users each get a free allowance of storage, database, and AI usage; they only pay if they exceed it.
How much does Puter.js cost?
Puter.js costs $0 for developers. There are no subscription fees, no usage-based billing for you. Users cover their own costs via their Puter accounts, and overages are paid directly to Puter, never through you.
Who is Puter.js best for?
Puter.js is best for developers and teams building AI-generated apps with coding agents. It's ideal for those who want a serverless, keyless backend without managing infrastructure, and for startups that want to scale from zero to millions without infrastructure costs.
What are the top alternatives to Puter.js?
Alternatives include Supabase, Firebase, Vercel, and AWS Amplify. These platforms offer backend services but typically require API keys, server configuration, and traditional billing models that scale with usage.
What is the key limitation of Puter.js?
The main limitation is that users must have a Puter account to use your app, and you rely on the Puter ecosystem for backend infrastructure. This might not suit developers who need custom server-side logic or who prefer to avoid dependency on an emerging platform.
