Todoist is a task manager that has stayed deliberately narrow for well over a decade. The core loop is capture and complete: press a shortcut, type what needs doing, and it is filed. The natural-language parser is the reason it feels fast. Typing "submit invoice every last friday #finance p1" produces a task in the finance project, priority one, recurring on the last Friday of each month, with no menus touched. Recurring rules handle awkward real-world patterns like "every 3rd tuesday" or "every weekday" that defeat simpler tools.
Organisation is projects, sections, labels and filters. Filters are a small query language over your own tasks, so views like "everything due this week with the deep-work label that is not in the client project" are saved once and checked daily. Most people settle on three or four filters and stop thinking about the system, which is the point.
Availability is the quiet advantage. There are native applications for macOS, Windows, Linux, iOS, Android and the web, browser extensions, a watch app, and integrations with calendar, email and chat tools. Whatever device you are holding when you remember something, Todoist is on it and works offline, syncing when the connection returns. For a tool whose value depends entirely on capturing thoughts before they evaporate, that coverage matters more than any feature.
The limits are the other side of the focus. Todoist manages tasks, not projects in the full sense: no dependencies, no Gantt charts, no resource planning, no time tracking beyond basic reminders. Collaboration exists, with shared projects, assignment and comments, but a software team will outgrow it. The free tier caps active projects and holds back reminders and calendar integration, which pushes most regular users to the paid plan fairly quickly.
The notable thing about Todoist is what it has not done. It has not become a wiki, a document editor or an all-in-one workspace, and the restraint is why it still opens instantly and why a list written in 2015 still makes sense today.
Who it suits: individuals and small teams who want a reliable list that syncs everywhere and does not need maintaining. Who should look elsewhere: teams needing dependencies, capacity planning or a full project methodology.