What is Kerlig used for?

Kerlig is an AI writing app for macOS that helps you write emails, Slack replies, Jira tickets, proofread text, and chat with documents—all without switching between apps.

How does Kerlig work?

Download and install the app, set a hotkey, and add an API key from an AI provider. Then select text in any app, press the hotkey, choose an action (e.g., Fix spelling), and paste the result. You can also use local models via Ollama or LM Studio.

What AI models does Kerlig support?

Kerlig supports over 350 models, including OpenAI, Anthropic Claude, Google Gemini, Perplexity, Groq, OpenRouter, Apple Foundation Models, and local models via Ollama and LM Studio.

Is there a free trial or refund policy?

Kerlig offers a 14-day money-back guarantee. There is no free tier, but you can request a refund within 14 days of purchase.

How does licensing work?

Kerlig offers one-time payment licenses: Basic ($49 for 1 Mac), Pro ($79 for 2 Macs), and Team ($297 for 10 Macs). Each includes one year of app updates. Token usage is billed separately by the AI providers.

Kerlig

Updated Jul 26, 2026

Boost productivity with Kerlig: AI-powered writing assistant for Mac. Write emails, Slack replies, proofread, chat with documents. One-time payment, 350+ models.

Categories:

Copywriting|

Productivity|

Research

#ai writing assistant#macos app#grammar fix#summarize#deep research

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Editor's Verdict

Rating: 4.8/5.0•Reviewed by RAGWiki

At $49, Kerlig stands out as a powerful solution in the copywriting,productivity,research landscape. It is especially well-suited for professionals like Product Designer and Software Engineer. However, potential buyers should note that it might not be perfect if you are strictly trying to avoid macos only. Overall, it offers a robust toolset that significantly accelerates workflows.

Key Takeaways

Proofread
AI Workflows
Chat with Documents
Personalization

In-Depth Review: What is Kerlig?

Kerlig is a native macOS app that integrates AI seamlessly into your workflow. Use it to draft replies, fix grammar, summarize documents, and more—all without switching apps. Supports over 350 AI models, custom actions, and deep research. No subscription, just a one-time purchase with lifetime updates.

Core Features

Proofread

Fix spelling and grammar errors before sending messages, with a single hotkey.

AI Workflows

Automate writing tasks like drafting replies, summarizing, and improving text across apps.

Chat with Documents

Analyze, summarize, and chat with webpages, ebooks, images, and other documents.

Personalization

Tailor writing style and tone using custom actions and presets for different situations.

350+ AI Models

Access models from OpenAI, Anthropic, Google, Groq, OpenRouter, and local models via Ollama/LM Studio.

Deep Research

Use reasoning models for multi-step research leveraging online data.

Integrations

Connect with preferred AI providers using API keys and run actions in any macOS app.

Privacy

Messages sent directly to AI providers, then stored and encrypted on your Mac.

Shortcuts & Hotkeys

Perform actions faster with global hotkeys and keyboard shortcuts.

Team Deployment

Remote deployment for teams via CLI commands.

Pricing

Basic License

$49

1 Mac (1 seat)
Lifetime 1 year app updates
Vision, Attachments, Presets
Use your tone of voice
350+ models: OpenAI, Anthropic, Google, Groq, OpenRouter with your own API key
Apple Foundation Models, Ollama, LM Studio
48h email support

Pro License

$79

2 Macs (2 seats)
Lifetime 1 year app updates
Vision, Attachments, Presets
Use your tone of voice
350+ models with your own API key
Apple Foundation Models, Ollama, LM Studio
24h email support

Team License

$297

10 Macs (10 seats)
Vision, Attachments, Presets
Use your tone of voice
350+ models with your own API key, plus Apple Foundation Models, Ollama, LM Studio
Remote team deployment using CLI commands
One year of app updates
Priority Zoom & email support

Pros and Cons

Pros

Seamless macOS IntegrationWorks natively in any app without switching context, saving time and effort.
Wide Model SupportAccess over 350 AI models including local ones, giving flexibility and choice.
One-Time PaymentNo subscription; pay once and only for token usage, reducing ongoing costs.
Customizable WorkflowsCreate custom actions and presets to match personal or team writing styles.
Privacy-FocusedData sent directly to AI providers and encrypted locally on your Mac.

Cons

macOS OnlyCurrently available only for macOS, limiting cross-platform users.
Requires API KeysMost features require setting up API keys from AI providers, which may be complex for some.
Token Costs Not IncludedUsers pay for AI usage (tokens) separately; ongoing costs depend on usage.
Limited Updates After One YearLifetime license includes only one year of app updates; newer features may require upgrade.
No Free TierNo free version available; only paid licenses with a 14-day refund policy.

Use Cases & Recommended Professions

Product Designer→ View Toolkit

Quickly draft emails, Slack messages, and feedback, and proofread in design tools without switching apps.

Software Engineer→ View Toolkit

Generate code snippets, convert types, summarize documentation, and chat with codebases using AI.

Business Owner→ View Toolkit

Handle client communication efficiently, fix grammar, and brainstorm ideas using various AI models.

Writer/Editor→ View Toolkit

Proofread, rephrase, summarize, and generate content across different tones and platforms.

PhD Student→ View Toolkit

Analyze academic papers, summarize research, and improve writing for theses and publications.

Customer Support Agent→ View Toolkit

Draft replies, fix spelling, shorten or expand messages, and ensure consistent tone in customer interactions.

Frequently Asked Questions

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ℹ️ Curation Disclosure: The overview and features of Kerlig were synthesized using AI and fact-checked by our curation team to ensure accuracy.