Kerlig

Kerlig is a macOS desktop AI writing assistant for individuals and teams who want AI help inside any app, including email, Slack, and Jira, without switching to a browser.

Key capabilities include:

• System-wide writing actions for proofreading, spelling and grammar fixes, rewrites, tone adjustments, summarization, translation, and structured outputs (for example, converting text into a TypeScript interface)
• Agentic Mode and MCP servers to connect tools such as Notion, Linear, Slack and GitHub and take actions, plus deep research and dictation
• Model choice and switching with support for 350+ AI models via user API keys (OpenAI, Anthropic, Google, Groq, OpenRouter), plus local models such as Apple Foundation Models, Ollama, and LM Studio
• Chat with attachments including PDFs, ebooks, documents, and images (vision), with chat history, prompt editing, and response regeneration
• Shortcuts and team deployment via global hotkeys (⌥ Option+Space), built-in and custom actions, presets, and remote CLI deployment for teams

Pricing: Paid, one-time license with no subscription, plus token usage via connected providers. Basic $49 once (1 Mac), Pro $79 once (2 Macs), Team $297 once (10 Macs), all with lifetime app updates and a 14-day money-back guarantee. Check kerlig.com for current promotions. Requires macOS 12+ (Apple Silicon or Intel).

Notable for combining cross-app macOS integration, broad multi-provider and local model support, and a privacy-focused approach where messages go directly to providers and data is stored encrypted locally on the Mac.