iPhone 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.

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.

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.

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.

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.

Day One is a popular journaling application available on macOS, iOS, and Android. It provides a simple and elegant interface for capturing daily thoughts, experiences, and memories with rich media support.

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.

Apple Calendar is a personal calendar application developed by Apple Inc., designed to seamlessly integrate with your Apple ecosystem whether you are on macOS or iOS. It allows you to manage your schedule, appointments, and events efficiently, synchronizing across all your devices.

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.