Project and task management

Fantastical alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

manuelernestog/weektodo2,133GPL-3.0Minimalist weekly planner and to‑do app with calendar-focused views for desktop and web.Open on GitHub mhss1/MyBrain2,109GPL-3.0All-in-one productivity app combining tasks, notes, and a calendar/diary interface.Open on GitHub

What you give up either way

Deep OS integrations (macOS/iOS widgets, Apple Watch, Vision Pro hooks)
Push sync across devices and platform-specific offline features
Built-in AccuWeather MinuteCast and time-to-leave traffic notifications
Enterprise features like SSO with OIDC/SAML as polished by Fantastical
Polish across native desktop and mobile apps (notifications, complications)

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Fantastical, and it does not prove anyone has run it for a month. How we decide.