How it compares

Each of these tools is good at its job. None of them would have caught the incident that started Percival: a stale worker running old code while beat fired a new schedule.

	change schedules from a UI	no restarts	per-schedule timezone	stale worker gate	duplicate guard
Percival	yes	yes	yes	yes	yes
Flower	no	n/a	n/a	no	no
django-celery-beat	yes (Django admin)	yes	yes	no	no
RedBeat	no UI	yes	no	no	no
Healthchecks, Cronitor	no	n/a	n/a	no	no

Flower shows workers and tasks as they run. It doesn't manage beat schedules. Percival and Flower can run side by side.

django-celery-beat stores schedules in your Django database and edits them in the Django admin. It's tied to Django. Percival works with any Celery app.

RedBeat keeps schedules in Redis so they can change at runtime, but it has no UI. Percival is built on RedBeat and adds the panel, timezones and a heartbeat.

Healthchecks and Cronitor tell you whether a ping arrived on time. They can't tell a duplicate run from a correct one, or know which version of your code a worker runs.