Kerlig

Kerlig is a paid AI writing assistant for Mac that helps with emails, Slack replies and Jira tickets in the apps you already use. It combines text editing with document chat and an agent that can read your screen and use your apps.

• Writing and tone: Correct spelling and grammar, rewrite or shorten text, summarize material, and personalize replies to suit your tone.
• Reusable actions: Save custom prompts for recurring work and use global hotkeys to access actions across apps, including actions that run in the background.
• Document chat: Ask questions about attachments, webpages, ebooks and images, with saved conversations, editable prompts and response regeneration.
• App access: Agentic Mode can read your screen and use your apps; MCP connections extend access to services such as Notion, Linear, Slack and GitHub.
• Online research: Deep Research uses reasoning models and online information for multi-step research, with citations you can open in a browser; this capability needs internet access.

Local model options include Apple Foundation Models, Ollama and LM Studio. Cloud connections use your own API keys for providers including OpenAI, Anthropic, Google, Groq and OpenRouter. Messages sent through cloud providers go directly to those services; Kerlig stores and encrypts messages on your Mac.

The app supports Apple Silicon and Intel Macs running macOS 12 or later.