The short answer is one to three. A new habit that isn't yet automatic burns a conscious decision and real energy every time you do it. Trying to build five or six behaviors at once splits that energy so thinly that none of them truly takes root, and they all collapse together on the first hectic day.
The consistent lesson from behavior science is to focus on a single keystone habit first. A keystone habit is one that triggers other positive behaviors on its own — think regular sleep, a morning walk, or daily planning. Once that one behavior is solid, whatever you stack on top of it meets far less resistance.
The safest approach is not to add a new habit until the current one is automatic — meaning you no longer have to push yourself to do it. Automaticity can take weeks depending on the person and the difficulty of the habit, and the price of rushing is usually a relapse.
Zinciri Kırma bakes this principle into the product: the free plan lets you track three active habits at once. That may look like a limit, but it's a design decision that keeps you focused — not so many that your attention scatters, but enough for meaningful progress. Each habit grows its own chain, and three solid chains are far more motivating than ten half-finished ones. When you genuinely need more, premium offers unlimited habits, but the advice stays the same: start small, truly establish one, then grow. The answer to how many habits you should track is the same as how many you can actually sustain.