Definio
Definio is an artificial intelligence (AI) enabled productivity and learning tool designed to facilitate a broad array of tasks. The tool p...
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What is Definio?
Definio is a multi-modal AI sidebar browser extension that brings over 35 premium AI language models together in a single convenient place within your browser. It allows users to chat with Claude Opus 4.1, Sonnet 4.5, Haiku 4.5, GPT-5.1, GPT-5, GPT-4.1, Gemini 2.5 Pro, and more AI models without switching tabs. The extension helps you explore, reason, and research faster by selecting any text on a page and starting conversations with multiple AI agents at once to cross-check facts and get diverse insights.
Key features include multi-source dictionary lookups with 450K+ words from Oxford and Wikipedia, real-time language translation, automatic flashcard note generation, text manipulation and summarization, code analysis and editing, and customizable shortcuts for productivity boosts like summarizing articles or extracting key points. The side panel design is privacy-first, non-intrusive, and persistent as you navigate between websites while keeping chat history accessible.
Definio is designed for students taking notes from web articles, professionals seeking quick translations, researchers conducting multi-source dictionary lookups, and developers analyzing and editing code. Whether you're researching, learning, or need quick explanations, Definio acts as an intelligent companion in your browser that lets you bring multiple AI minds into the room for comparison, consensus, and control rather than relying on one model's opinion.
Definio pricing
Pricing model: Free
Definio offers three pricing plans based on Energy Units: Lite provides 300 Energy Units per day, Plus provides 1000 Energy Units per day, and Pro offers Unlimited Energy. The extension offers in-app purchases for upgrading plans. A free tier may be available to start using the tool with optional upgrades. Pro plan includes unlimited energy access for users who need unrestricted AI model usage.
Definio pros
- Access to 35+ premium AI models including Claude, GPT, and Gemini in one sidebar
- Multi-agent conversations let you cross-check facts across different AI models
- Select any text on any webpage to instantly start AI conversations
- Privacy-first side panel design that doesn't inject content into web pages
- Non-intrusive design that never covers or alters content you're reading
- Persistent chat history accessible while navigating between different websites
- 450K+ word dictionary with Oxford and Wikipedia sources
- Real-time language translation supporting multiple languages
- Automatic flashcard note generation for learning and retention
- Code analysis and editing capabilities for developers
- Customizable keyboard shortcuts (Alt+Shift+O default) for quick access
- Right-click menu option to open chat instantly without selecting text
- Summarize complex topics and dense articles without switching tabs
- Subject-specific fine-tuned language models with contextual knowledge
- Google-verified for safety and reliability on Chrome browser
- Multiple access methods: keyboard shortcut, right-click menu, and extension icon
- Cross-platform accessibility through Browser Copilot feature
- Secure protocols ensuring user interactions remain private and safe
Definio cons
- Does not work with PDF files viewed in the browser
- Requires stable internet connection for AI interactions
- No offline functionality available
- Daily usage caps on Lite and Plus plans with energy unit limits
- Lite plan limited to 300 Energy Units per day
- Plus plan limited to 1000 Energy Units per day
- Requires JavaScript enabled for optimal use
- Running multiple AI models simultaneously can affect device performance
- No mobile app available, only browser extension
- Single-user mode only without multi-user collaboration
Frequently asked questions about Definio
What is Definio and what does it do?
Definio is an all-in-one AI Copilot and browser extension designed to boost productivity and optimize learning. It integrates over 35 advanced language models including Claude, GPT, and Gemini into your browser workflows, allowing you to chat with multiple AI models, summarize text, translate languages, look up definitions, create flashcards, and analyze code directly from any webpage without switching tabs.
How do I install Definio on my Chrome browser?
You can install Definio by visiting the Chrome Web Store and adding it as an extension. Search for 'Definio AI: Multi-modal AI Sidebar' in the Chrome Web Store, click the Add to Chrome button, and confirm the installation. Once installed, the extension icon will appear in your browser toolbar.
Is Definio free to use?
Definio offers both free and premium plans. You can start using it for free with the Lite plan that provides 300 Energy Units per day. Optional upgrades are available including the Plus plan with 1000 Energy Units per day and the Pro plan with Unlimited Energy through in-app purchases.
Do I need to create an account to use Definio?
Yes, creating an account is necessary to access Definio's full range of features. The account allows you to access your chat history, manage your energy units, customize your preferences, and upgrade to premium plans.
What AI models are available in Definio?
Definio includes Anthropic models (Claude Opus 4.1, Claude Sonnet 4.5, Claude Haiku 4.5), OpenAI models (GPT-5.1, GPT-5, GPT-5 Chat, GPT-5 Mini, GPT-5 Nano, GPT-4.1, GPT-4.1 Mini, GPT-4.1 Nano), and Google models (Gemini 2.5 Pro, Gemini 2.5 Flash, Gemini 2.5 Flash Lite), totaling over 35 advanced language models.
How do I summarize text with Definio?
To summarize text with Definio, open the side panel using Alt+Shift+O, right-click and select 'Open Chat', or click the extension icon. Then select the desired text section on the webpage, and it will automatically send it to the AI Chat for analysis. You can ask the AI to summarize the text, and it will condense it effectively from short paragraphs to lengthy articles.
What languages does Definio support for translation?
Definio supports multiple languages for translation, allowing for global communication. It can translate entire webpages directly within your browser and helps users understand unfamiliar languages or dialects, making it particularly beneficial for multi-linguistic environments.
How do I take notes with Definio?
Definio provides a note-taking feature where you can create and organize notes into different notebooks. You can document important learning points, meeting discussions, and intriguing ideas. The tool also offers automatic flashcard note generation and the option to create customized e-notebooks to organize definitions into multiple categories.
Is Definio safe to use with my Chrome browser?
Yes, Definio is Google-verified for safety and reliability, ensuring secure interactions with your browser. The developer has disclosed that it will not collect or use your data, your data is not being sold to third parties, and it's not being used for purposes unrelated to the extension's core functionality. The side panel works in its own dedicated space without injecting content into web pages.
Why does Definio use a side panel instead of a popup?
The side panel design offers several advantages: privacy-first approach where Definio works in its own dedicated space without injecting content into web pages, non-intrusive design that never covers or alters content you're reading, better workflow allowing you to ask questions about what you're reading without losing your place, persistent chat that stays visible while continuing to read and navigate the web, and seamless integration to instantly discuss any text you encounter while browsing.