Zinciri Kırma
This appLet's be honest: there is no Apple Watch app yet — it's planned on the v1.1 roadmap. Today it shines on iPhone; static iOS home-screen and lock-screen widgets show your chain at nearly wrist-fast speed. A strong pick if a watch isn't a hard requirement.
Best for: People who can stay on iPhone for now and wait for watch support on the roadmap
Streaks
Offers a full-featured Apple Watch app and is an Apple Design Award winner. You can check off tasks straight from the watch and keep them on your face with complications. iOS-only.
Best for: iOS users who want to manage habits entirely from their wrist
Productive
Provides an Apple Watch app and complication support on iOS; you can see and check off the day's routine from the watch. Subscription-based.
Best for: Subscription users who want to track their routine from the watch
Habitify
Offers an Apple Watch app, widgets, and cross-device sync; a habit you check on the watch updates instantly on iPhone. Runs on iOS and Android.
Best for: Users who want seamless sync between watch and phone
Habitica
Has an Apple Watch app for its gamified system; you can check off daily tasks from your wrist and advance your character. Free with a premium subscription.
Best for: People who want to bring gamification to their wrist
If a real Apple Watch app is essential today, Streaks, Productive, Habitify, and Habitica are solid, honest picks. Zinciri Kırma's watch app hasn't shipped yet (it's planned for v1.1); but if you want the chain metaphor and forgiveness mechanics on iPhone, it leads on the phone until the watch version lands.