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:
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Unit Converter – Easily switch between yoctoNEAR, NEAR, and other denominations.
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Contract WASM Downloader – Download deployed smart contracts in raw WebAssembly format.
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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:
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Account Cleaner Utility
Lets users surgically remove state, access keys, or contracts—especially useful for unblocking accounts with storage bloat. -
Dedicated Utility Pages
Each tool now lives on a distinct page, and the app remembers your last active tab for a smoother dev experience. -
Enhanced Key Separation
Workspace- and network-based scoping of keys adds clarity and avoids cross-contamination. -
Streamlined UX and Bug Fixes
Dozens of subtle enhancements make this release more intuitive and polished.
Explore the full release notes for technical details.
🧠 Ideal Use Cases
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Developers needing a graphical smart contract playground.
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Educators demonstrating how NEAR works in a classroom or workshop.
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QA teams looking for a rapid way to simulate or debug contract behavior.
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Anyone who prefers full control of their keys without using custodial wallets.
🔗 Try Lantstool Today
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🔗 Live Demo: app.lantstool.dev
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📦 Source Code: GitHub – ui.web.lantstool
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🎥 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.
Updated: May 2, 2025
Top comment
This built-in key generator and secure storage system seem like a smart approach to managing cryptographic keys, especially for users who need to operate across different workspaces and networks. By generating keys directly in the browser and storing them locally, it minimizes exposure to external threats. However, I wonder about the robustness of local storage against sophisticated attacks—could there be additional layers of encryption or hardware-based security measures to further enhance protection? It’s also worth considering how easy it would be to recover keys if local storage gets corrupted. Overall, a promising solution, but with room for deeper security considerations.