About

What you can do here

• Compare any two phones: what each does better, worked out from the numbers, and every spec side by side.
• Compare sizes at true scale, front and side, or at actual size on your screen after a quick calibration with a bank card.
• Check how long a phone gets updates: each phone page shows the maker’s OS and security update promise and when it runs out.

How we collect specs

For every phone, a pipeline finds the maker’s own spec page, the Wikipedia article and a couple of independent pages such as reviews. A language model reads each page and writes down the specs it states for that exact model: not a sibling like the Pro or the Plus, and never from memory.

Then every value is checked against the page it came from. A number is kept only if the page actually writes it next to a fitting word (a battery size next to “mAh”, a weight next to “g”), names must match the page’s wording, and yes/no features need the page to mention them; anything else is dropped. Values outside plausible ranges are dropped too.

The pages are then compared with each other. When two agree, or the maker states a value, it counts as confirmed. A value from a single independent page is marked with a small ¹, and when pages disagree we show the best-ranked source (maker, then Wikipedia, then the rest) and mark it with a ^?. A phone is only published once its size, weight, screen, chip and battery are all confirmed this way. Every phone page lists its sources.

We don’t copy other spec databases: their terms don’t allow it, and building from the makers’ own pages is more reliable anyway.

Size outlines

Outlines are drawn from each phone’s published height, width and thickness, with the screen sized from its diagonal and resolution. Corner shapes and camera bumps are approximations; the overall size is exact to the published figures.

Which comparisons we list

Every pair of phones can be compared, but we only list and suggest the ones worth reading: phones launched around the same time at a similar price, siblings from the same launch, and each phone against the one it replaced. Popularity comes from how often people read about each phone on Wikipedia.

Is it free?

Yes, with no account. The site is paid for by the sponsor tiles around each page; if you’d like one, see Advertise. WhichPhoneToBuy is made by 3AM SaaS. Spotted a wrong spec or a missing phone? Write to 3amsaas.com.