How accurate are these estimates?
As accurate as the dates they are built from. Where a manufacturer publishes an end-of-support date, the security half is exact and the page says so. Where none is published, the date is inferred from that maker’s track record and is labelled as an estimate. The wear half is always an estimate: a typical figure for that class of hardware at the usage level you picked, not a prediction about your own unit.
Why do I get two dates instead of one?
Because two separate things end a device’s life and they do not arrive together. Hardware wear is a duration, and heavy use shortens it. The security cutoff is a fixed calendar date set by the manufacturer. The estimate you act on is whichever comes first, and knowing which one it was tells you whether a repair would help at all.
Does replacing the battery extend the security update date?
No. Nothing extends it. A new battery restarts most of the hardware wear clock, which is genuinely useful when wear is what limits your device. It has no effect whatsoever on when the manufacturer stops shipping patches.
Does buying refurbished or second-hand reset the clock?
Not on its own. The security cutoff is tied to the model rather than to your copy of it, so a refurbished unit expires the same month as every other one. The wear clock runs from the original release month too, because a refurbished device still carries a battery of its original age unless that battery was actually replaced. If it was, enter it in the battery field and the estimate accounts for it.
Where do the support dates come from?
Published manufacturer policies wherever they exist, cited on each device page with a link and the date it was last checked. Google publishes exact end-of-support dates for Pixels and Samsung publishes a commitment per device line, so those are firm. Every device carries a confidence label, so you can always see which kind of date you are looking at.
Why does Apple have no official dates?
Because Apple does not publish any. Every Apple device here carries an estimate derived from Apple’s observed behaviour, which has run to roughly six major OS releases followed by two to three years of security-only patches. That is a pattern rather than a promise, and it is labelled as one.
Can I keep using a device after security updates stop?
It will keep working, and the risk grows quietly rather than all at once. Newly discovered flaws simply stop being fixed. How much that matters depends on what the device does: a tablet used for video is a very different proposition from the phone holding your bank app and your two-factor codes.
How often is the data updated?
Every device record carries its own last-verified date, shown on the device page and in the footer of the site. The full dataset is published, so you can check any figure yourself rather than taking it on trust.
My device is not listed. What now?
Pick the closest model from the same maker and generation. The wear figures are keyed to a class of hardware rather than to one model, so a near neighbour gets you close on that half. Confirm the security date directly with the manufacturer, using the guide on checking support dates.
Do you track me or use cookies?
This site sets no cookies and runs no cross-site tracking. Visits are counted by GoatCounter, which is cookieless and records no personal data. Your theme choice is kept in your own browser and is never sent anywhere. The privacy policy sets out the detail.
How does this site make money, and does that affect the numbers?
Some links to retailers and repair suppliers are affiliate links, and a purchase through one may earn a commission at no extra cost to you. It changes no estimate. The dates come from published support policies and from wear figures fixed per hardware class, neither of which has any idea what pays.
Is anything I type sent to a server?
No. The calculator runs entirely in your browser. The device catalogue is downloaded once and every figure is computed locally, so the device you pick and the battery health you enter are never transmitted.
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Get the dates for your own device
Pick your phone, laptop or tablet and get both dates: when the hardware gives out, and when the security updates stop.
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