Readdle is a software company that provides a range of productivity apps for iPhone, iPad, and Mac users, including tools for document processing, email management, file scanning, and scheduling.
PDF Expert is a PDF tool that supports reading, editing, annotating, signing, and converting PDFs.
According to the information provided, its core apps are available for free download from the Apple App Store. Specific features and premium services may involve in-app purchases or subscriptions.
Spark is an intelligent email client with smart inbox categorization, teamwork features, and an AI assistant to help draft and manage emails.
Readdle's apps are primarily developed for the Apple ecosystem, available on iPhone, iPad, and Mac devices, and typically support syncing across these devices.
Documents is a multifunction file manager that can store, view, and edit various formats of files (such as documents, videos, and music), and it integrates cloud services and file management features.

UPDF AI is a cross-platform PDF solution that integrates artificial intelligence features, offering smart dialogue, summarization, translation, and other document analysis capabilities, alongside comprehensive PDF editing, conversion, annotation, and management tools to help you boost your document workflows and content creation experience.

Spark Mail is an AI-powered smart email client that brings together multiple inboxes, intelligently categorizes messages, and provides AI-assisted writing tools to help individuals and teams handle daily email communication and collaboration tasks more efficiently.