Manifest

Free

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Type

Open Source

Visit Website GitHub (40 stars)

About Manifest

Manifest is an open-source model router for AI agents and applications. It provides a single OpenAI-compatible endpoint that connects to 300+ models across 31 built-in providers, including OpenAI, Anthropic, Google, xAI, AWS Bedrock, and Alibaba Cloud. Users can mix API keys, subscription plans, and local models, with intelligent routing based on query complexity, specificity, or custom HTTP headers. Features include spending tracking with notifications and limits, automatic fallback on failed queries, and support for custom OpenAI/Anthropic-compatible endpoints. Manifest can be self-hosted via Docker or used through the cloud version at app.manifest.build, with one-click deployment options for Railway, Render, DigitalOcean, AWS, GCP, and others.

Key Features

Intelligent routing based on query complexity, specificity, and custom HTTP headers

Mix API keys, subscriptions, and local models through a single endpoint

Track every dollar spent with configurable notifications and spending limits

Automatic fallback to alternative models when a query fails

OpenAI-compatible endpoint for seamless integration with existing tools

Supports 300+ models via 31 built-in providers, including OpenAI, Anthropic, Google, xAI, AWS Bedrock, and Alibaba Cloud

18 subscription flows for reusing provider subscriptions

Dynamic provider catalog discovered when credentials are connected

Self-hosted via Docker image or cloud version at app.manifest.build

One-click deployment on Railway, Render, DigitalOcean, AWS, GCP, Fly.io, Coolify, Easypanel, Heroku, and Koyeb

Pros & Cons

Pros

Open-source and free to self-host with full control over data and infrastructure
Prevents single-provider lock-in by supporting 31 providers and 300+ models
Built-in spending tracking helps manage costs across multiple providers
Automatic fallback improves reliability in production AI workflows
Simple API compatible with OpenAI's format, making integration easy
Supports local models and subscription flows, reducing API key dependency

Cons

Self-hosting requires Docker and a PostgreSQL database, which may be complex for non-technical users
Cloud version may have usage limits or pricing not disclosed on the GitHub page
Relies on proper configuration of routing rules to avoid unnecessary costs

Best For

Building AI agents that need access to multiple model providersAvoiding vendor lock-in by routing queries across providersOptimizing costs by using cheaper models for simple tasks and advanced models for complex onesEnsuring reliability with automatic fallback when a model failsCentralizing API key management and spending tracking for teamsDeveloping applications that require local model inference alongside cloud APIs

FAQ

What is Manifest?

Manifest is an open-source model router for AI agents and apps. It provides a single OpenAI-compatible endpoint that connects to multiple model providers and intelligently routes queries based on complexity, specificity, or custom rules.

How does routing work?

Manifest routes each query to the appropriate model based on factors like query complexity, specificity, and custom HTTP headers. Users can define rules to direct simple queries to cheaper models and complex ones to advanced models.

What providers are supported?

Manifest connects to 300+ models through 31 built-in provider connections, including OpenAI, Anthropic, Google, xAI, AWS Bedrock, and Alibaba Cloud. It also supports custom OpenAI/Anthropic-compatible endpoints and 18 subscription flows.

Is Manifest free?

Manifest is open-source and free to self-host using the provided Docker image or one-click deployment options. A cloud version is available at app.manifest.build, which may have its own pricing.

How do I get started?

For the cloud version, go to app.manifest.build and follow the guide. To self-host, run the provided Docker install script and sign up at http://localhost:2099 (the first account becomes admin). One-click deployment templates are available for Railway, Render, DigitalOcean, AWS, GCP, and others.