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A cycle is using 100% of your battery's capacity in total, not plugging in once. Use 60% today, recharge, use 40% tomorrow: that adds up to one cycle. Recent iPhones show the count in Settings › Battery › Battery Health.

It is an estimate and says so. Cyclewise uses Apple's design target (80% of original capacity at the rated cycles, under ideal conditions), assumes health falls in a straight line with cycles, which is cautious, and measures your pace from your own check-ins. It never promises a health percentage. When your screenshot shows a maximum capacity, that is your iPhone's own reading, not ours.

Yes. Apple rates iPhone 14 and earlier at 500 cycles and iPhone 15 at 1,000, so the same pace reaches 80% about twice as fast on an older phone; Cyclewise uses the right rating for your model (source: support.apple.com/en-us/101575). If your iPhone doesn't show a cycle count in Settings, tell Cyclewise roughly how old it is: it estimates the cycles from age and pace, and marks the result as estimated. iPhone 16 and 17 are not named on Apple's page, so Cyclewise uses the iPhone 15 figure and says it is inferred.

They matter, and Cyclewise does not measure them. The plan counts cycles only: heat, long stretches at 100% and fast charging also age a battery, so the real date can come sooner. The charge-limit what-ifs follow a general lithium-ion rule of thumb and are labelled estimates.

Maybe. Apple's one-year limited warranty covers defective batteries, and consumer law where you live may give you more rights. If your battery wears unusually fast in its first year, Cyclewise says so, keeps your readings as a record and points you to Apple. Apple decides, after its own diagnostic. Cyclewise is not legal advice and does not sell repairs or AppleCare.

Yes. Cyclewise is free: no ads, no subscription, no in-app purchase, nothing locked. It is made by one independent developer. If it is useful to you, you can leave an optional donation from the Support screen in the app or from our support page. A donation is a gift: it unlocks nothing and you never have to.

Your readings and settings stay on your iPhone, and screenshots are not kept. Cyclewise sends anonymous usage statistics (for example: onboarding finished, a check-in added, the goal changed, with your iPhone model and a rough pace: light, typical or heavy) to PostHog. Never cycle counts, capacities or screenshots. Turn them off any time in Settings › Usage statistics. The optional donation page is run by a third party, with its own privacy policy. Details in our privacy policy.