# Chromia Docs

Chromia is a relational blockchain: your data lives in real tables, you write and query it in Rell, each app runs on its own chain, and users pay no gas. Run your first dapp locally in about ten minutes, then deploy it to Testnet or Mainnet.

## Getting Started

Set up and start building in just a few minutes.
- [01 Quick start Start coding in 2 minutes with GitHub Codespaces →](/get-started/installation/)
- [02 Create your first dapp Build a Hello World dapp with Rell →](/get-started/create-dapp/)
- [03 Deployment Deploy your dapp to Chromia's Testnet or Mainnet →](/build/deployment/)

## Use cases

- [Vector Database Build recommendation systems and similarity search applications on Chromia’s decentralized network using the Vector Database Extension.](/get-started/use-cases/ai-on-chain/vector-db/)
- [AI Inference Create conversational AI and intelligent decision making systems using Chromia’s AI Inference Extension.](/get-started/use-cases/ai-on-chain/ai_inference/)
- [Real-time Data Integrate real-time data streams like price feeds using the Stork oracle extension for responsive dapps.](/get-started/use-cases/real-time-data/)
- [Cross-chain Apps Implement secure communication between dapp and system chains using ICMF and ICCF protocols.](/get-started/use-cases/cross-chain/)
- [Discover more →](/get-started/use-cases/)

## API reference

- [Rell standard library 447 reference pages](/pages/rell-stdlib/)
- [FT4 Rell API 579 reference pages](/pages/ft4-rell/)
- [FT4 TypeScript client 417 reference pages](/pages/ft4-ts-client/)
- [Postchain REST API 35 endpoints](/pages/postchain-restapi/)

## How to use the docs ​

The documentation is organized into several key sections to help you navigate based on your needs:
- [Get Started](/get-started/)
High-level introduction to Chromia, overview, getting started guides,
fundamentals, and use cases.
- [Build](/build/deployment/)
Comprehensive guides for Deployment, CLI, Configuration, Accounts & Tokens (FT4), Clients, Integrations, Token chain, and our Cookbook with practical examples.
- [Deployment](/build/deployment/)
- [CLI](/build/cli/introduction/)
- [Configuration](/build/configuration/)
- [Accounts & Tokens (FT4)](/build/ft4/intro/)
- [Clients](/build/clients/overview/)
- [Integrations](/build/integrations/)
- [Token chain](/build/token-chain/)
- [Cookbook](/build/cookbook/overview/)
- [Ecosystem](/ecosystem/bridge/overview/)
Explore Chromia's ecosystem tools including Bridge, Node Providers, Governance, Extensions, Filehub, and Block Explorer.
- [Bridge](/ecosystem/bridge/overview/)
- [Node Providers](/ecosystem/providers/overview/)
- [Governance](/ecosystem/governance/overview/)
- [Extensions](/ecosystem/extensions/)
- [Filehub](/ecosystem/filehub/overview/)
- [Block Explorer](/ecosystem/block-explorer/)
- [Rell](/rell/rell-intro/)
Dive into Rell, Chromia's powerful programming language for building dapps.
- [Reference](/build/cli/commands/)
Access detailed references for FT4 APIs, Terminology, and Release Notes.
- [FT4 APIs](/reference/ft4/)
- [Terminology](/reference/terminology/)
- [Release Notes](/updates/)

### Core Concepts

- [Rell Relational blockchain language.](/rell/rell-intro/)
- [FT4 Standard Standard for accounts and tokens.](/build/ft4/intro/)
- [Architecture Network topology, clusters, and anchoring.](/get-started/about/architecture/platform-architecture/)

### Guides & Documentation

- [Chromia CLI Command line tool for building and deploying dapps.](/build/cli/introduction/)
- [Cookbook Practical examples and code snippets for common patterns.](/build/cookbook/overview/)
- [Testnet Guide Setup guide for testnet development and token claiming.](/build/deployment/testnet-tokens/)

### Dev Tools

### Client SDKs

- [JavaScript / TypeScript Connect a TypeScript/JavaScript frontend to your Rell backend.](/build/clients/postchain-clients/javascript-typescript/hello-world-quickstart/)
- [Kotlin / Java Interact with Chromia from Kotlin or Java apps.](/build/clients/postchain-clients/kotlin-client/)
- [Python Integrate Python applications with Chromia blockchain.](/build/clients/postchain-clients/python-client/)