CyclewiseWhen will your iPhone battery fade?
Cyclewise reads one screenshot of Battery Health, estimates the month your battery drops below 80%, and turns the date you want into a daily battery budget. Read on your iPhone, no account.
- Cycles
- 63 / 1,000
- A day
- ≈0.7
- Below 80%
- mid-2030
Example, an estimate
Three steps, about a minute
- 01Settings › Battery › Battery Health
Screenshot Battery Health
Open Settings, then Battery, then Battery Health, and take a screenshot. Cyclewise reads the cycle count and maximum capacity on your iPhone, shows you the numbers to confirm, then forgets the image. Typing them works too.
- 0280% · around mid-2030 · estimate
See the month it drops below 80%
From your cycles, your pace and Apple's rating for your model, Cyclewise estimates when the battery crosses 80% of its original capacity. Every date is labelled an estimate.
- 03goal → % of battery a day
Set a daily budget
Pick a goal, say 85% for four years. Cyclewise turns it into a share of battery per day and tells you, at each check-in, whether you're over or under.
The founder's iPhone Air: 63 cycles, about 0.7 cycle a day. At that pace it crosses 80% of its original capacity around mid-2030.
- iPhone
- Air
- Cycles
- 63
- Pace
- ≈ 0.7 / day
- Rating
- 1,000
Example, an estimate. Cycles only: heat and fast charging age a battery too.
Where the numbers come from
Apple designs iPhone batteries to keep 80% of their original capacity at a number of complete charge cycles, under ideal conditions. Cyclewise uses that rating for your model, and tells you when it is inferred.
| iPhone | 80% at | Source |
|---|---|---|
| iPhone 14 and earlier | 500 | Apple support page |
| iPhone 15 | 1,000 | Apple support page |
| iPhone Air | 1,000 | On the phone: Settings › Battery › Battery Health › Battery & Warranty |
| iPhone 16, 16e, 17 | 1,000 | Inferred from the iPhone 15 rating (not named by Apple) |
- The model is linear and conservative: many batteries still show 100% for their first cycles.
- Charge-limit what-ifs (100, 95, 90, 85, 80%) use a general lithium-ion rule of thumb, not Apple data, and are labelled estimates.
- Cyclewise is not affiliated with, endorsed or approved by Apple.
Apple: iPhone battery and performance ↗Battery University: prolonging lithium batteries ↗
Honest by design
Read on your iPhone
Screenshots are read on the device by Apple's Vision text recognition, never uploaded and not kept. Your readings live only on your iPhone.
No account
No sign-up, no email, no password. Open it, show it your Battery Health screen, done.
Sources you can check
Apple's cycle ratings are cited and linked, inferred ratings are marked, and every computed date says estimate. No health percentage is ever promised.
Questions
What is a charge cycle?
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.
Is it accurate?
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.
Does it work on older iPhones?
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.
What about heat and fast charging?
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.
My battery is wearing fast. Is it under warranty?
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.
Is it really free?
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.
What do you collect?
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.
Know the month. Then push it back.
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