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.
TypeBoost is an AI writing assistant for macOS and iOS that works inside the apps you already use. Select text, press a shortcut, and run your own prompts to fix grammar, improve emails, translate or dictate — without switching tools.
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
TypeBoost
TypeBoost is an AI writing assistant for macOS and iOS that works inside the apps you already use. Select text, press a shortcut, and run your own prompts to fix grammar, improve emails, translate or dictate — without switching tools.
AI Inside Every App
Select text anywhere on Mac or iPhone, run an action, and the improved result is inserted in place — no copy-pasting between tools.
Custom Prompts & Models
Bring your own prompts, choose your preferred models (OpenAI, Anthropic, Google on Pro) and build repeatable workflows that sound like you.
Voice to Text
Turn speech into clean, formatted text with Voice Mode and AI Dictation without leaving the app you are working in.
Granular Diff Control
See every AI change and revert individual edits while keeping the rest, so you keep full control of the output.
強み・メリット
+Works inside the apps you already use on Mac and iPhone — no context switching
+Fully customisable prompts and model choice keep your own writing voice
+Granular diff lets you review and revert individual AI edits
+Voice Mode and AI Dictation turn speech into polished text
+Generous free tier to evaluate before paying
制約・デメリット
–Limited to Apple platforms — no Windows or Android app
–The free tier's 50,000 credits are meant for trying it out, not daily heavy use
–Credit budgets and varied model options take a little learning to tune
QuillBot is an AI writing suite best known for its paraphrasing tool. Users paste or type text and have it rewritten in different tones and styles, while companion tools handle grammar checking, summarizing, citations, plagiarism checks and AI content detection. It is widely used by students, writers and professionals.
QuillBot is an AI writing suite best known for its paraphrasing tool. Users paste or type text and have it rewritten in different tones and styles, while companion tools handle grammar checking, summarizing, citations, plagiarism checks and AI content detection. It is widely used by students, writers and professionals.
特化型ParagraphAI is an AI writing assistant and keyboard that fixes grammar, drafts replies and generates polished text in 40+ languages across apps and devices.
特化型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.
