Monica

Monica is an all-in-one AI assistant that works as a browser extension, desktop app and mobile app. It gives you access to several leading AI models, including models from OpenAI, Anthropic and Google, in one place, and brings them to every website you visit through a sidebar.

With Monica you can chat with AI, summarise web pages, PDFs and YouTube videos, write and rewrite emails and posts, translate text and whole pages, ask questions about what you are reading and generate images. Memo features let you save useful content into a personal knowledge base that the AI can draw on later. Because it lives next to whatever you are doing, it saves a lot of copying and pasting between tabs.

Good fit if you: want one AI subscription for many models and quick help on any website.
Less ideal if you: only use a single model and prefer its official app.

Pricing: free plan with daily limits; paid plans unlock more usage and advanced models.