SAiY is an AI keyboard for iOS, Android, Mac, Windows and browsers that writes, edits, translates and adjusts the tone of your messages inside any app where you already type.
Typeahead is a system-wide AI autocomplete app for Mac that completes your sentences inside the apps you already use, running entirely on your machine so your writing is never sent to a server.
SAiY is an AI keyboard for iOS, Android, Mac, Windows and browsers that writes, edits, translates and adjusts the tone of your messages inside any app where you already type.
Smart writing assistant
Draft, rewrite, fix grammar and adjust the tone of messages in seconds, directly inside any app where you type.
Real-time translation
Translate between 50+ languages while you type, so you can reply to international customers fluently.
Tone and intent control
One tap switches between professional, friendly, persuasive or apologetic tones, keeping your message appropriate for the context.
Marketing copy on demand
Generate social posts, ad headlines and email copy in your brand voice without leaving the keyboard.
強み・メリット
+Works across every app and platform you already type in
+Translates 50+ languages and adjusts tone in real time
+Free plan with no credit card required
+Security-focused design aimed at business and enterprise use
–Free tier limits daily suggestions and translations
–Best experience is on a smartphone keyboard, which some desktop users find less convenient
–Browser access requires a paid Freelance plan or higher
Typeahead
Typeahead is a system-wide AI autocomplete app for Mac that completes your sentences inside the apps you already use, running entirely on your machine so your writing is never sent to a server.
Sentence completion where you already type
Faint ghost text completes the word or sentence you are typing right at the cursor. Tab accepts the entire suggestion, the right arrow takes just the next word, and Esc dismisses it so you stay in control.
Private by design and offline capable
The model runs on your Mac rather than in the cloud. Typeahead never sends your writing to a server and keeps working offline after setup, which makes it suitable for work email and sensitive documents.
Screen and clipboard context
It reads what is on screen and what you copied to the clipboard, so replies fit the thread you are actually answering rather than being generic filler.
Per-app writing styles and your own colour
Set a voice per app, professional in Mail and friendly in Messages, choose from seven color-blind-safe highlight shades, and tune suggestion timing to instant, balanced or only when you pause.
強み・メリット
+Completes your sentences in place, so you never leave the app you are writing in or copy text back from a chatbot
+Runs locally on your Mac and never sends your writing to a server, with offline support after setup
+
Learns your own phrases and personal vocabulary, so suggestions sound like you rather than like a generic model
+Screen and clipboard context make replies fit the actual thread or document
+Per-app writing styles, 16 languages, adjustable timing and seven color-blind-safe highlight colours give fine-grained control
+Works across a wide set of everyday Mac apps including Mail, Messages, Slack, Notion, Chrome, Gmail, Outlook, Google Docs and Word
制約・デメリット
–Currently Mac-only, so Windows, Linux, iOS and Android users cannot use it
–The site still shows a waitlist alongside 'Get Typeahead', which can suggest availability is being rolled out gradually
–Because it only completes text where you already type, it will not draft a long document or research a topic for you the way a chat assistant will
–Per-app writing styles and learned phrases take a little setup before the suggestions feel genuinely personal
–Payment structure is described only as paid, without an obvious free tier for long-term use
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無料・オープンソースParagraphAI is an AI writing assistant and keyboard that fixes grammar, drafts replies and generates polished text in 40+ languages across apps and devices.
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WriteMail.ai is an AI email writing assistant that turns a few rough key points into a polished, correctly toned email. It handles new messages as well as replies, supports dozens of languages, and offers tone, length and style controls plus a Chrome extension and desktop apps for getting drafts out of the browser faster.
無料・オープンソースParagraphAI is an AI writing assistant and keyboard that fixes grammar, drafts replies and generates polished text in 40+ languages across apps and devices.
無料・オープンソースSlashit is a desktop text expander for Mac and Windows that layers AI rewriting on top of classic snippet automation. Type a short trigger such as /projectchat and it expands into a full message, complete with dynamic placeholders that pull in the right names, dates, or project details. Highlight any text in Gmail, Slack, Notion, or your CRM, press the Magical hotkey, and it rewrites the selection in place using your saved instruction and preferred model — no copy-paste cycle, no switching tabs. Clipboard history keeps recently copied snippets available for reuse.
無料・オープンソースGHOSTYPE is a macOS voice input layer that replaces typing with speech and then cleans the result with AI. You hold a hotkey, talk naturally, and polished text lands directly in whatever app has focus — email, chat, code editor or notes — with per-app tone profiles so a Slack message and a client email do not sound the same.
