Kerlig

What it does

Kerlig is a macOS writing app. It offers built-in and custom actions for tasks like proofreading, summarizing and writing replies. It supports over 350 AI models through your own API keys, plus local models such as Apple Foundation Models, Ollama and LM Studio. It also connects to MCP servers like Notion, Linear, Slack and GitHub.

Kerlig is a native Mac writing assistant for people who write at work and want AI help without leaving their current app. You can run actions such as proofread, summarize or make shorter, and create your own presets. The app supports more than 350 models through your own API keys, and it also works with local models like Apple Foundation Models, Ollama and LM Studio. MCP servers connect tools such as Notion, Linear, Slack and GitHub. Agentic Mode and MCP servers are listed in the paid licenses. The Basic License costs $49 once for one Mac, with lifetime app updates. A 14-day money back guarantee is stated. Prices are in USD and VAT may apply. Token costs are paid separately to AI providers. The site says messages are sent directly to AI providers and then stored and encrypted on your Mac. The app requires macOS 12 or later and runs on Apple Silicon and Intel. There is no free plan listed, and the site does not state whether an account is required or whether the software is open source.