Saicha - Your AI Assistant

Saicha is an AI chat extension you can open instantly from the Chrome side panel. Ask questions, summarize pages, translate, or draft content without leaving your current tab. It supports both Japanese and English and is designed for everyday use with cost transparency and privacy-first local storage. Key features • Always-on side panel access: chat with AI without switching screens • Web search with cited sources: let the AI look things up on the web (OpenAI / Anthropic / Google) with a "Sources" list appended to answers • Streaming responses: watch replies appear in real time, with a stop button • Markdown rendering: answers displayed with formatting and syntax-highlighted code blocks • Selected text handoff & quoting: reference or auto-quote on-page selections • Screenshot questions: capture the visible page and ask the AI about it • Keyboard shortcut: launch with Ctrl+Shift+A • Context menu action: “Ask AI about selected text” • Branching conversations and smart titles: start new threads from any message, auto-generate concise titles • Full localization: Japanese and English • Cost visibility: real-time calculation for input, output, and cached tokens • Context cache awareness: applies discounted pricing automatically when cache is used • Usage reports: daily, monthly, and total cost (USD and JPY) • Fetch latest models from the API: add newly released models without waiting for an update • Auto-save and search for chat history: stored safely on your device • Security-focused: XSS protections and encrypted API key storage • Flexible customization: set assistant name and personality Supported AI models • OpenAI: GPT-5 / GPT-5.5 / GPT-4.1 families (including mini and nano) and GPT-4o mini • Anthropic: Claude Opus 4.7 / Sonnet 4.6 / Haiku 4.5 • Google: Gemini 3.5 Flash / 3.1 Pro / 3.1 Flash-Lite / 2.5 families • Fetch the latest models directly from each provider's API • Custom API: connect your own AI services Common use cases • Summarize long pages into key points • Draft emails and documents in English, refine wording in polite Japanese • Explain code or formulas and investigate error messages • Edit tone and style, expand bullet points into prose • Ask follow-up questions about selected web text or compare alternatives Privacy and storage • Chat history is saved in your browser’s local storage (never sent to our servers) • API keys are stored encrypted • No unnecessary permissions are used Permission usage • sidePanel: required to display the side panel UI • activeTab / tabs: used to hand off selected text and open the side panel • contextMenus: adds the right-click menu item • storage: saves local settings and chat history Getting started 1. Open Options and set your preferred AI service and API key 2. Launch via shortcut (Ctrl+Shift+A) or the extension icon 3. Select text on a page and ask, or type any message Recommended for • Users who want quick answers while researching • Anyone who drafts, translates, or summarizes without switching screens • Those who want clear insight into AI usage cost • Privacy-conscious users who prefer local history storage Support For issues or feature requests, contact us via the link in the Options page or the project repository. Version notes • 1.7: Added web search with cited sources; migrated OpenAI to the Responses API • 1.6: Added the in-app changelog viewer, update notifications, and auto-saving settings • 1.5: Added latest-generation models, on-demand model discovery from the API • 1.3: Added real-time cost tracking, usage analytics, and context caching support Notes • A valid API key and compliance with each AI provider’s terms are required • Displayed costs are estimates based on provider pricing (with currency conversion)