I Built an Offline-First Productivity App for Freelancers and Solo Developers

The author built an offline-first productivity app called Essentials for freelancers and solo developers to manage clients, projects, tasks, notes, time tracking, and more in one place.

Details

The author wanted to create a simple, all-in-one productivity tool for freelancers and solo developers that would work reliably even with unstable internet connections. Essentials combines client/project management, task tracking, notes, time logging, invoicing, and other core workflows in one app. It's built using Ionic, Angular, and Capacitor to support web, Android, and iOS platforms. A key focus was making the app 'offline-first', writing data locally first and syncing it later so the app remains usable even without an internet connection. The author also added security features like 2-factor authentication, app lock, password vault, and clipboard protection to make the app suitable for storing sensitive work data. While the app is still being improved, the author learned that 'simple' apps quickly become complex when combining offline support, sync, security, and other advanced features.