Android Apps to Built-in Calendar

Gmail, a cornerstone of Google's productivity suite, is a free, web-based email service renowned for its intelligent organization, powerful search capabilities, and integration with other Google services. Available across various platforms, it remains a leading choice for personal and professional communication.

aCalendar is a feature-rich calendar and task management application designed for users who need robust synchronization, detailed event management, and a user-friendly interface.

Toshl is a comprehensive personal finance management application designed to simplify tracking expenses, income, and budgets across various accounts, including bank accounts, credit cards, and cash.

Visto is a versatile collective task dashboard designed to streamline project management, team collaboration, and workflow automation. It offers a central platform for managing tasks, tracking progress, and improving team efficiency across various business processes.

ALTO Mail is an intelligent email client designed to simplify real-life organization. It offers a unified inbox, robust features like built-in calendars, and integration capabilities to streamline communication and tasks.

Jorte is a comprehensive calendar and organizer application designed to help users manage their schedules, tasks, and notes efficiently across multiple devices. It offers a flexible and customizable interface to suit individual preferences and integrates with popular calendar services.

Open365 is a comprehensive, open-source productivity suite offering cloud storage, office applications, and communication tools. Built upon a foundation of open-source technologies like KDE, Seafile, and LibreOffice, it provides a robust alternative to proprietary solutions, emphasizing privacy and control.

ColorNote is a lightweight and intuitive notetaking and checklist application for Android. It allows users to quickly create and organize notes and lists with color-coding, syncing, and simple features for everyday productivity.

EssentialPIM is a versatile personal information manager designed to help you organize your life. It allows you to manage appointments, tasks, notes, contacts, passwords, and more, all within a single, customizable application available for desktop and mobile platforms.

Yahoo! Mail is a long-standing web-based email service offering various plans for personal and business use. It provides essential email functionalities along with integrated features like chat and calendar.

Yandex.Mail is a robust and feature-rich free email service offering generous storage, strong privacy features, and seamless integration with other Yandex services. It provides comprehensive support for various protocols and tools for efficient email management for both personal and professional use.

Buffer is a comprehensive social media management platform designed to help individuals and businesses schedule posts, analyze performance, and engage with their audience across various social networks.

ProtonMail is a leading secure email service utilizing end-to-end encryption and zero-access architecture to protect user privacy. Developed by scientists at CERN, it offers a robust and user-friendly platform for sending and receiving confidential communications.

Microsoft Outlook is a comprehensive personal information manager designed for managing email, contacts, calendars, and tasks.