Kerlig
Native macOS AI writing assistant with 350+ models, pay once.
Kerlig is the right call for Mac users who write a lot and want to avoid monthly subscriptions. The one-time $49 license is a strong value if you factor in API token costs. Casual users may find setup overhead not worth it versus a ChatGPT subscription.
Verified 5d ago · liveness 80/100 · cite: rightaichoice.com/tools/kerlig
- Mac users who write many emails, Slack messages, or Jira tickets daily
- Product managers and designers aiming to improve written communication
- Non-native English speakers needing grammar and phrasing help in situ
- Developers and researchers wanting local model support and deep research
- Windows or Linux users (macOS 12+ only)
- Budget-conscious buyers wanting a free plan—there is no free tier
- Users expecting built-in API keys—you must bring your own and pay token costs
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Skip Kerlig if you need cross-platform support, expect a free tier, don't want to manage API keys and pay token costs, or require advanced team collaboration features.
You must bring your own API keys from providers like OpenAI, Anthropic, or Google, and pay for token usage—these costs can add up with heavy use.
Kerlig's one-time pricing (Basic $49, Pro $79, Team $297) fits individual professionals and small teams who prefer no recurring fees. Compared to subscription-based tools like Grammarly (about $12/month) or ChatGPT Plus ($20/month), Kerlig can be cheaper in the long run, but you must factor in API token costs. For heavy users, token fees may rival a subscription.
In short
Kerlig — Native macOS AI writing assistant with 350+ models, pay once. Best for Mac users who write many emails, Slack messages, or Jira tickets daily, Product managers and designers aiming to improve written communication, Non-native English speakers needing grammar and phrasing help in situ. Plans from $297/mo.
What's new in Kerlig
Checked 3 days agoAcross the latest 5 updates: 3 feature updates and 2 changelog entries.
Kerlig 2.8.1 fixes new line loss in Obsidian and Slack
Kerlig 2.8.1 fixes an issue where selected text in apps like Obsidian and Slack could lose line breaks.
Kerlig 2.8.0 adds Agentic Mode and MCP support
Kerlig 2.8.0 introduces Agentic Mode (AI uses tools with approval) and MCP server support. Also fixes emoji loss in Slack/Discord and error message details.
Kerlig 2.7.1 fixes non-QWERTY keyboard shortcuts
Kerlig 2.7.1 fixes custom keyboard shortcuts not working on French AZERTY and other non-QWERTY layouts.
Kerlig 2.7.0 adds GPT-5.6, Claude Opus 5, Gemini 3.6 Flash
Kerlig 2.7.0 adds latest models (GPT-5.6, Claude Opus 5, etc.), faster text capture without touching clipboard, and fixes for multi-monitor and menu bar issues.
Kerlig 2.6.0 adds save attachments as Markdown
Kerlig 2.6.0 lets users save attachments (websites, YouTube transcripts, app content) to disk as Markdown.
What people actually say about Kerlig — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
25 mentions across 2 sources (Bluesky, Lemmy) · researched Jul 5, 2026.
- +Native macOS app with global hotkey for instant access.
- +Supports 350+ models from OpenAI, Anthropic, Google, local, etc.
- +One-time purchase model—no recurring subscription fees.
- +On-device Apple Foundation Model support for privacy.
- +Clever web summarization via direct HTML reading.
- −Very limited community feedback to validate claims.
- −Only macOS—no Windows, Linux, or mobile support.
- −Requires bringing your own API keys and paying tokens.
- −Buzz appears mostly from the developer, not organic users.
- −Low revenue per visit suggests limited market traction.
- • Users must pay AI provider token usage separately (e.g., OpenAI API fees).
- • No free trial or demo mentioned in community data.
Viability Score
How well maintained and how widely used is Kerlig? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- Global hotkey (⌥+space) to invoke AI in any app
- Proofread grammar and spelling
- Rewrite, summarize, and translate text
- Chat interface similar to ChatGPT
- Attachments: analyze webpages, PDFs, images, YouTube transcripts
- Save attachments as Markdown
- Deep research with reasoning models and citations
- Reasoning models show chain of thought
- Dictation for voice input
- Customizable presets and actions
- Edit and regenerate responses
- Chat history navigation
- Headless mode for background actions
- Agentic Mode & MCP servers (v2.8)
- Support for 350+ models including GPT-5.6, Claude Opus 5, Gemini 3.6 Flash (as of v2.7.0)
About Kerlig
Kerlig brings AI-powered writing to your entire Mac, letting you proofread, rewrite, summarize, translate, and chat with documents without leaving your current app. It's built for professionals who write constantly—product managers, designers, non-native English speakers, researchers—and who waste time switching to a browser for ChatGPT. Using a global hotkey (⌥+space), you can instantly fix grammar, generate Slack replies, or run custom actions in email, Jira, Slack, and beyond. Kerlig supports over 350 models from providers like OpenAI, Anthropic, Google Gemini, Groq, OpenRouter, and local options like Apple Foundation Models, Ollama, and LM Studio, so you can switch providers per task or go fully offline. You manage your own API keys, and your messages are sent directly to your chosen provider, then stored encrypted on your Mac. The latest version, Kerlig 2.8, introduces Agentic Mode, which can take multi-step actions via MCP servers and integrations with tools like Notion, Linear, Slack, and GitHub. Attachments—webpages, PDFs, images, YouTube transcripts—can be analyzed, summarized, or saved as Markdown. Deep research with reasoning models and citations, dictation, and a chat interface round out the toolkit. Kerlig is sold as a one-time license (Basic $49, Pro $79, Team $297), so you pay once and then only for token usage. This is not a cloud subscription; it's a native Mac utility that replaces browser-switching overhead. If you value privacy, control, and model flexibility, Kerlig is a cost-effective choice. However, it requires API key setup and is macOS-only (macOS 12+), with no free tier. Compared to Grammarly, Kerlig offers broader AI control and model variety, but a steeper initial setup.
Behind the Verdict
Kerlig makes sense for a specific type of user: someone who lives in email, Slack, and Jira, and who hates context-switching to a browser to get AI help. The global hotkey is the killer feature—it turns AI into a system-level utility rather than a tab you have to remember to open. We'd reach for this when we want to proofread a client email without interrupting our flow, or when we need to quickly summarize a lengthy PDF while doing research. Where it bites: you have to bring your own API keys. That means managing token costs, which can be unpredictable. If you're not comfortable with that, the apparent savings vs. a ChatGPT subscription can evaporate. Kerlig is also macOS-only, for now, so if you bounce between Windows and Mac, it won't follow you. Compared to Grammarly, Kerlig is less about grammar correction and more about full AI control. You can switch between models mid-conversation and run deep research with citations. But Grammarly's free tier and browser extension still beat Kerlig for casual users. Agentic Mode in v2.8 is a differentiator—it can connect to MCP servers and act on services like Notion, Linear, or GitHub. But this is advanced territory; most users will stick with the core actions. It's a one-time purchase, but remember that 'lifetime updates' for Basic and Pro means only one year of app updates. After that, you still own the license, but you won't get new features. Teams might prefer the Team license for priority support and remote deployment via CLI. In practice, if you're a product manager or designer who writes daily, the workflow improvement is real. We'd recommend starting with the Basic license to test the waters before committing to Pro.
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Real-world workflow fit
Concrete scenarios for the personas Kerlig actually fits — and what changes day-one when you adopt it.
Writing status updates and emails
Outcome: Use Kerlig's global hotkey to quickly proofread and rephrase emails, ensuring professional tone and clarity without leaving your email client.
Communicating with clients
Outcome: Invoke Kerlig to fix grammar and suggest more natural phrasing in Slack and email, boosting confidence and reducing errors.
Summarizing academic papers
Outcome: Attach PDFs to Kerlig and use deep research to extract key points and citations, saving hours of manual reading.
Use Cases
- Write professional email replies with personalized tone and grammar correction
- Draft Slack messages that sound like you using custom presets
- Summarize long webpages, PDFs, or ebooks into concise bullet points
- Generate YouTube script ideas or convert content into other formats
- Perform deep research by reasoning across multiple online sources
- Proofread and polish any text before sending or publishing
Models Under the Hood
as of 2026-09-02
Limitations
- Kerlig is a native macOS app requiring macOS 12+ and supports both Apple Silicon and Intel.
- It relies on API keys for most AI providers, so usage may incur token costs beyond the one-time purchase price.
- Some local models may have limited context windows.
- The app is desktop-only and does not expose a public API.
as of 2026-08-21
Verification history
We have re-verified Kerlig 6 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Kerlig tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Basic License
$49/once (regularly $247)
Ideal for
Individual professionals with one Mac who want a lifetime license and don't need multi-device support.
What this tier adds
Starting tier: $49 one-time for 1 Mac, includes 1 year updates, vision, attachments, presets, and 350+ models with your own API keys.
Pro License
$79/once (regularly $467)
Ideal for
Power users with two Macs (e.g., work and personal) who need support for 2 seats and faster email support.
What this tier adds
Adds 2 Macs (2 seats) and 24h email support (vs 48h on Basic), at $79 one-time.
Team License
$297/once
Ideal for
Small teams of up to 10 Macs that want remote CLI deployment and priority support.
What this tier adds
Expands to 10 seats, includes CLI deployment, priority Zoom & email support, and a 14-day money-back guarantee, at $297 one-time.
Where the pricing makes sense
The company stage and team size where Kerlig's pricing actually pencils out — and where peers do it cheaper.
Kerlig's one-time pricing (Basic $49, Pro $79, Team $297) fits individual professionals and small teams who prefer no recurring fees. Compared to subscription-based tools like Grammarly (about $12/month) or ChatGPT Plus ($20/month), Kerlig can be cheaper in the long run, but you must factor in API token costs. For heavy users, token fees may rival a subscription.
Setup time & first value
How long it actually takes to get something useful out of Kerlig — broken out by persona, not the marketing-page minute.
For individuals: about 15 minutes to download, install, and configure API keys. For teams: 30-60 minutes, including CLI deployment for the Team license.
Switching to or from Kerlig
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Grammarly: Switch to Kerlig for broader model control and one-time pricing, but note you'll need to set up API keys.
- →From ChatGPT: Use Kerlig's native macOS integration to avoid browser switching, while keeping your own API keys.
- ↗To another AI writing tool: Export your chat history if needed, but Kerlig does not offer a built-in export feature.
Integrations
Resources & Guides
Tutorials & Learning
Official links
Tools that pair well with Kerlig
Common stack mates teams adopt alongside Kerlig, with the specific reason each pairing earns its keep.
Featured Head-to-Head Comparisons
Kerlig vs Poke Interaction Co
Choose Kerlig if you’re a macOS professional who writes daily in email/Slack and wants granular control over AI models (including local). Choose Poke if you prefer a chat-based assistant that manages your email, calendar, and health data hands‑free across messaging apps, especially if you value a free tier and proactive automations.
Kerlig vs Letterhead
If you're a solo macOS user who writes daily—email, Slack, documents—and wants broad AI model choice with privacy, Kerlig is the clear pick. For teams scaling multi-newsletter operations with AI-powered content curation and portfolio analytics, Letterhead is purpose-built. They solve completely different problems; choose based on whether your bottleneck is individual productivity or multi-brand email management.
Kerlig vs Gem
Gem is a powerful all-in-one recruiting platform for talent acquisition teams needing AI-driven sourcing, ATS, and fraud detection. Kerlig is a native macOS writing assistant for individuals who want to speed up daily text tasks with flexible model choice. They serve entirely different needs — choose based on whether your primary challenge is hiring or writing.
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