15 Best Free Crypto Tools for Developers in 2026

Whether you're building a DeFi app, an ordinals marketplace, or a crypto portfolio tracker, these free tools will accelerate your development.

Blockchain Explorers

• Mempool.space — Best Bitcoin mempool visualizer and block explorer
• Etherscan — Ethereum blockchain explorer with API access
• Blockstream.info — Clean Bitcoin explorer with REST API

Development Frameworks

• Hardhat — Ethereum development environment for testing and deployment
• Foundry — Fast Solidity toolkit (forge, cast, anvil)
• Remix IDE — Browser-based Solidity editor and compiler

Wallet & API Tools

• Alchemy — Node infrastructure with free tier (300M compute units/mo)
• The Graph — Decentralized API for querying blockchain data
• Chainlink — Oracle network for real-world data in smart contracts

Security

• OpenZeppelin — Audited smart contract libraries
• Slither — Static analysis for Solidity vulnerabilities

Bitcoin Ordinals Tools

• ordinals.best — Rate and rank ordinal collections
• ordinals.pics — Visual ordinals gallery
• Hiro API — Bitcoin API with ordinals support