01
Install extension
Add plenz to Chrome and pin it. The popup and options surfaces are ready immediately.
Open source - Privacy first
Real-time prompt diagnostics
Rewrite weak prompts before you send them.
plenz scans your input inline, proposes higher-precision alternatives, and keeps your keys and prompt data local to your browser.
Need setup details first? Follow the plenz setup guide or jump straight to the provider connection steps.
Capability map
Technical UX, not decorative UX.
Every panel is flat, border-defined, and information-dense so state and actions remain obvious under extension-sized constraints.
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Inline suggestions
plenz flags vague phrasing in real time and offers stronger rewrites before you hit enter.
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Bring your own key
Use OpenAI, Gemini, Anthropic, Mistral, Groq, OpenRouter, or local models from one control plane.
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Local-first privacy
API keys and prompt text stay in your browser storage. No plenz relay service in the middle.
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Platform coverage
Runs across major AI chat surfaces with automatic input detection and low-friction defaults.
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Open source stack
MIT licensed codebase with readable extension internals and no hidden premium behavior.
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Keyboard flow
Accept and dismiss suggestions with fast key chords to keep your drafting loop uninterrupted.
Setup sequence
Operational in under one minute.
The onboarding path prioritizes fast activation: install, configure, then draft with immediate inline feedback.
02
Connect model provider
Choose provider, add key, test connection, and set an active model in one bordered config flow.
03
Draft with guidance
plenz annotates weak prompts in-context and lets you accept rewrites from the keyboard.
Supported surfaces
Works in your existing AI tabs.
plenz detects target input areas and injects suggestions without changing your host platform workflow.
Custom
Use your own
Use cases and FAQ
Clear answers for setup, privacy, and fit.
plenz is built for people who refine prompts all day and want clearer output without changing their existing workflow. Start with the setup guide and compare supported AI surfaces before you install.
Which AI tools can plenz work with?
Answer
plenz helps you refine prompts inside ChatGPT, Claude, Gemini, Mistral, OpenRouter, and custom AI chat surfaces so you can improve instructions before they reach a model.
How does Bring Your Own Key work?
Answer
You connect your own provider credentials to plenz, so usage is billed directly by OpenAI, Anthropic, Google Gemini, Mistral, Groq, OpenRouter, or your custom endpoint instead of through a plenz markup layer.
Is plenz private by default?
Answer
Yes. API keys and prompt text stay in your browser storage, and plenz does not rely on a relay service that sits between your prompt and the model provider you choose.
Who is plenz built for?
Answer
plenz is built for founders, marketers, operators, support teams, and prompt-heavy developers who want clearer AI instructions without changing the tools they already use every day.
How quickly can I start using plenz?
Answer
Most users can install the extension, connect a provider, and start refining prompts in a few minutes. The getting-started guide walks through installation, provider setup, and API key configuration step by step.
Deploy now
Ship better prompts on the first draft.
plenz is free, open source, and ready for immediate use with your own provider key.
Need a quick walkthrough first? Read the setup guide or review the supported AI surfaces.
No account required - BYOK - MIT license