Todoist, in development.
Nothing connects yet.

• Personal tasks get nested projects, so a project can hold projects.
• Sections group the tasks inside a project, the way Todoist does.
• Subtasks become full tasks of their own, with their own dates and priority.
• Typing #project in Quick Capture files a personal task, and creates the project if it is new.

• Both directionsA task added, finished, rescheduled or edited on one side shows up on the other.
• Fields that matchTitle, notes, done, priority, date and time, deadline, repeat, labels, project, section and subtasks, plus a reminder set at a time.
• A switch per kind of taskPersonal tasks come first. Grocery has its own switch. Client and internal tasks stay out unless you turn them on.
• You choose what syncsOn the first connection you pick which Todoist projects take part. Nothing is matched by title.
• Connects with a tokenThe first version uses a personal Todoist API token and syncs while PuraTasks is open.

• No duplicates: every change is logged before it is sent, so a retry cannot create a second copy.
• A deleted task goes to Trash first and can be restored.
• A cycle that would delete or complete a large batch pauses and asks you first.
• Pause and disconnect stop syncing and delete nothing on either side.
• A settings log lists every change the sync made.

Comments, attachments, durations, location reminders and collaborators stay in Todoist. Habits stay in PuraTasks. Neither side gets a field blanked because the other has no match for it.