Stop typing prompts.
Start engineering them.

No. LeanPrompts operates directly on top of your existing, native browser sessions. You do not need to buy API keys, manage token limits, or pay per prompt. You keep full access to premium platform features like Claude's Artifacts or ChatGPT's Advanced Data Analysis, completely free of charge.

Text expanders and template engines only output flat text strings, forcing you to manually scroll through 50 lines of prompt text inside the chat window to hunt down and edit [BRACKETS] by hand. Furthermore, they cannot attach binary files or orchestrate sequential workflows. LeanPrompts enforces strict separation of prompt logic and input data: your template stays untouched in the background, while the extension auto-generates a dedicated sidebar form with text inputs, dropdown menus, and synthetic file dropzones ({{file: spec.pdf}}).

You can, but text in Notion or markdown files is static and dead. Every time you use it, you have to switch windows, copy the text, hunt down brackets in the chat, and manually attach reference files. LeanPrompts turns your library into an active command center directly alongside your AI chat: press Ctrl+K to find any template instantly, fill out auto-generated form inputs, compare past revisions with a visual diff viewer, and inject everything without leaving your workflow.

LeanPrompts uses a client-side injection engine that communicates directly with the active browser tab via synthetic DOM events. It updates the internal rich-text model of the chat interface (handling ProseMirror, Slate, and Quill architectures), programmatically attaches local files via native DataTransfer events, and bypasses the manual copy-paste clipboard shuffle.

LeanPrompts is fully compatible with all Chromium-based web browsers. In addition to Google Chrome and Microsoft Edge, the extension runs on Brave, Opera, Vivaldi, Arc, and other Chromium derivatives. You can install it directly from the Chrome Web Store on any compatible browser.

Your prompt library, templates, dynamic presets, and version history remain strictly inside your browser's local IndexedDB sandbox. Unlike other prompt managers, we run no intermediary cloud databases, no analytics trackers, and zero middleman servers. When you trigger an injection, your data moves directly from your local browser session to your chosen AI provider without passing through our hands. For complete air-gapped isolation with zero data leaving your machine, run LeanPrompts with local offline models like Ollama or LM Studio.

Yes, fully. If you handle confidential client IP, strict NDAs, or proprietary code that must never touch external cloud servers, you can connect LeanPrompts directly to local instances like Ollama or LM Studio on localhost. In this configuration, both your prompt library and your actual model execution remain 100% offline within your local machine memory.

There is zero risk of cluttering your local workspace. Every single import session, whether from our verified blueprints or the community playground, is tracked atomically. If an imported workflow, its associated snippets, or Knowledge Base articles do not fit your needs, you can navigate to the Settings panel inside the extension and execute a 1-click Rollback. This safely purges all components created during that specific import session, instantly restoring your previous workspace state.

Never. Your work belongs entirely to you. You can export your entire database (prompts, step notes, version histories, presets, and custom configurations) as a clean, human-readable JSON file with a single click at any time. Zero vendor lock-in.

No. The core browser extension requires zero account creation, zero email registration, and zero logins. You install it from the Chrome Web Store and start engineering prompts immediately. Optional accounts on the website are only used if you purchase premium commercial blueprints or join upcoming team waitlists.