Thinkbeside: AI Sidebar for GPT, Claude, Gemini, DeepSeek & Grok

GPT, Claude, Gemini, DeepSeek and Grok in one AI sidebar. Chat with any page, PDF or YouTube video, translate pages, write emails.

Thinkbeside is an AI sidebar for Chrome. Chat with any webpage, PDF, recording or YouTube video, translate pages, documents, images and video subtitles, speak your questions, listen to the answers, create images, compare AI models side by side, and write email replies in Gmail™ and Outlook.com, without copying anything into another tab. Every answer cites the page, section or timestamp it came from, so you can check it in one click. Start free with 100 credits a month and no API key, or use your own API key. 🆕 NEW IN 1.5.0 - See what the model makes: web pages, drawings, diagrams and long documents open in a preview beside the chat, with versions. Previews run in an isolated sandbox that can't reach your keys or conversations, and are set up to block requests to the internet - Ask questions of a CSV or Excel file. It is read in your browser; the model gets only column names, a summary of each column and 20 sample rows, and the analysis runs in your browser, with tables and charts back - On discussion sites, summarize the thread you're reading, explain a post or draft a reply. You see what was read before anything is sent, and Thinkbeside never posts - Act on a page: describe a task and Thinkbeside works in your current tab on sites you allow. Routine steps run on their own; sending, buying, deleting, signing in and going to another site wait for your OK. Stop at any moment. It never reads or fills in password, payment or ID fields - Free models on a plan use no credits, and the free plan has its full 100 credits from day one 🆕 NEW IN 1.4.0 - Speak instead of typing: press the mic (Alt+M) and your words land in the message box for you to check. Needs a microphone; Chrome asks once, and the recording is never kept - Chat with recordings: transcribe a meeting, lecture or podcast of up to 3 hours and ask about it, with times that play the recording from that moment - Listen to replies with your browser's own voices, or a provider's AI voice - Create images from a description, in square, portrait or landscape, on a plan or your own key - Translate a page in place, a PDF, Word or text file beside the original, the text in an image, and YouTube subtitles, with a language and model of your choice - Open a PDF from a Chrome tab in Documents with one click - Yearly Plus: US$120 a year, plus tax where it applies - Credits follow each model's price, shown as "about N credits" before you send, and many more models are available on a plan - A calmer message box with an Add menu for files, tabs, screenshots, prompts, web search and deep research 🌐 TRANSLATE WEBPAGES, PDFs, IMAGES AND VIDEOS - Translate an article, forum or documentation page in place, paragraph by paragraph, and switch back to the original in one click - Translate a PDF page by page, or a Word or text file section by section, read it beside the original and download it as Markdown or side-by-side HTML - See the text in a screenshot or photo beside its translation, with tables kept - Read a YouTube video in two languages: a bilingual transcript that follows playback and a translated line on the player - Choose the language and the model in Settings › Translation; works with your own key or a plan 📖 CHAT WITH ANY WEBPAGE, PDF OR VIDEO - Summarize any article or webpage, pull out the key points or have a hard passage explained in plain words - Chat with PDF and Word documents; answers link to the exact page or section - Read scanned PDFs with built-in OCR (English, Hindi, Gujarati and German); nothing is uploaded to read them - On YouTube, get key moments, a searchable transcript and timestamps that jump to the right second - Select text to explain, summarize, translate or rewrite it, from the toolbar or the right-click menu - Get suggested follow-up questions after each answer 🔎 RESEARCH ACROSS TABS AND MODELS - Chat with up to 6 open tabs at once to compare products, articles or viewpoints - Compare AI models: send one question to up to 4 models and read the answers side by side - Group chat with 2 to 4 AI models; @mention one to ask only it - Ask about screenshots and images (up to 4 per message), or extract the text from an image in one click ✍️ AI WRITING ASSISTANT - AI email replies in Gmail™ and Outlook.com that use the open thread, in the tone and length you choose - Improve a draft in any text box and review the change before it replaces your text - Write from a brief: pick a tone and length, get a draft or an outline - Rewrite, paraphrase, shorten or translate what you've written 🤖 AI MODELS Use models from OpenAI (GPT), Anthropic (Claude), Google (Gemini), DeepSeek and xAI (Grok), on the free plan or with your own API key. Or add any OpenAI-compatible provider, including local LLMs on your own computer. The recommended model for each provider is chosen for you; pick another any time. 📚 BUILT FOR EVERYDAY WORK - Save your favourite prompts and insert them with "/" - Find past chats, group chats and comparisons - Sync conversations, documents and prompts across browsers you sign in to - Shortcuts: Alt+O opens the sidebar, Alt+A asks about selected text Made for students, researchers, writers and professionals who read, research, translate and write in the browser every day. 💰 PRICING - Free: 100 credits a month on smaller models. A reply uses credits depending on the model; some models use none. - Plus: US$12 a month or US$120 a year, plus tax where it applies, for up to 2,000 credits a month; cancel anytime - Your own API key: no allowance and no markup; you pay your provider at its API rates - Web search and deep research use plan credits, even with your own key ❓ FAQ Is Thinkbeside free? Yes. Install it, create a free account and use the free plan without an API key. Plus adds more credits: US$12 a month or US$120 a year, plus tax where it applies. Can I talk to it? Yes. Press the mic to dictate, or the speaker button on a reply to hear it. Can it make images? Yes. Choose Create an image in the message box and describe the picture. Do I need an API key? No. A key is optional; with one, you pay your provider directly and chats on your key don't use credits. Is an API key the same as a ChatGPT Plus or Claude Pro subscription? No. API access is billed separately by each provider. Can it translate? Yes. Choose "Translate this page" from the right-click menu or the sidebar, or open a file or video and pick a language. 🚀 GET STARTED 1. Add Thinkbeside to Chrome 2. Sign in free with email, Google or GitHub 3. Use the free plan, or add your own API key in Settings 4. Press Alt+O and ask about what you're working on Privacy policy: https://thinkbeside.com/legal#privacy Support: https://thinkbeside.com/contact Thinkbeside is an independent product and is not affiliated with or endorsed by its supported AI providers, Google or Microsoft. Gmail and YouTube are trademarks of Google LLC. Outlook is a trademark of the Microsoft group of companies. Other product names and logos are trademarks of their owners.