Lantstool is an open-source, client-side development interface purpose-built for the NEAR blockchain. It enables developers to manage transactions, work with cryptographic keys, interact with RPC endpoints, and inspect account details—all within a single, streamlined interface.
Feature
Description
Platform
Web-based UI for NEAR Protocol
Primary Features
Transactions, key management, RPC access, utilities, account insights
Security Model
Fully non-custodial; local browser storage only
Current Version
v1.3.0 (Released April 28, 2025)
Repository
GitHub – ui.web.lantstool
Live Interface
app.lantstool.dev
🔍 Core Capabilities
🧱 1. Transaction and Call Builder
Lantstool allows developers to create, preview, save, and reuse transactions and contract calls. These can be exported/imported in JSON, making them versionable and shareable for team workflows.
🔐 2. Key and Account Management
A built-in key generator lets you create cryptographic key pairs directly in the browser. Keys are stored securely in local storage, separated by workspace and network to ensure proper isolation.
🌐 3. RPC Access and API Testing
Lantstool serves as a graphical frontend for NEAR RPC endpoints. Developers can issue view and change function calls, test contracts, or simulate transactions—all without touching the command line.
📊 4. Real-Time Account Insights
The platform retrieves detailed information about NEAR accounts: balance, state usage, storage costs, access keys, and associated contracts. This provides a full diagnostic view of an account’s structure.
🔧 5. Utility Toolbox
Lantstool includes several auxiliary tools:
Unit Converter – Easily switch between yoctoNEAR, NEAR, and other denominations.
Contract WASM Downloader – Download deployed smart contracts in raw WebAssembly format.
Account Cleaner Tool – Clean up large accounts or remove specific state items when standard deletion fails.
✨ New in Version 1.3.0
Lantstool’s latest update (v1.3.0) introduces notable improvements:
Account Cleaner UtilityLets users surgically remove state, access keys, or contracts—especially useful for unblocking accounts with storage bloat.
Dedicated Utility PagesEach tool now lives on a distinct page, and the app remembers your last active tab for a smoother dev experience.
Enhanced Key SeparationWorkspace- and network-based scoping of keys adds clarity and avoids cross-contamination.
Streamlined UX and Bug FixesDozens of subtle enhancements make this release more intuitive and polished.
Explore the full release notes for technical details.
🧠 Ideal Use Cases
Developers needing a graphical smart contract playground.
Educators demonstrating how NEAR works in a classroom or workshop.
QA teams looking for a rapid way to simulate or debug contract behavior.
Anyone who prefers full control of their keys without using custodial wallets.
🔗 Try Lantstool Today
🔗 Live Demo: app.lantstool.dev
📦 Source Code: GitHub – ui.web.lantstool
🎥 Overview Video:
Whether you’re just getting started with NEAR or are deep in production, Lantstool will radically accelerate your workflow while keeping you in full control.