Pico Ai Copilot is an app that provides an AI writing assistant for Mac, iPhone and iPad users. It can help with various tasks such as sending emails, automating workflows, and creating engaging content. It uses a chat interface and integrates with Siri® for easy access. It also offers different writing personas and styles to suit different needs. The app is free to download but offers in-app purchases for monthly or yearly subscriptions. The app is powered by GPT4 and respects user privacy and security. The app has positive ratings and reviews from users who praise its convenience and quality.