Apple

Sep 7, 2026AW-0148Partly right

How much storage does the Apple Watch Series 12 have?

pdfu finds Readiness app in Apple Watch code

pdfu found an unannounced Readiness app, a Sunstone4p0 sensor family and a 128GB storage profile in watchOS 27 code.

Forum member pdfu found references to an unannounced Readiness app, a new sensor family called Sunstone4p0, and a 128GB storage option in watchOS 27 code, hinting at deeper health tracking for the Apple Watch.

How to read this record

  1. What was reportedpdfu found an unannounced Readiness app, a Sunstone4p0 sensor family and a 128GB storage profile in watchOS 27 code.
  2. Who said it, and whenpdfu reported it on Sep 7, 2026 in MacRumors.
  3. What happened, and whenApple Watch Series 12 was announced on Sep 9, 2026, 2 days after this report.
  4. The verdict, and whyPartly rightSome of this was right and some of it was not.Why: The Readiness app shipped on Apple Watch, as this code find said. The Sunstone4p0 sensor family and the 128GB storage tier are not confirmed by anything Apple announced, so two of the three findings remain unchecked. What the company published
What do these words mean?
Right
It turned out the way this report said.
Partly right
Some of this was right and some of it was not.
Wrong
It did not turn out this way.
Moving target
This was right about the plan at the time. The company then changed it.
Never settled
The company has announced the product and nobody ever confirmed or denied this.
Not comparable
This measured a different thing from the number the company published, so the two cannot be compared.
No outcome yet
Nothing has happened yet that would prove this right or wrong.
Not checked yet
The company has answered this. We have not finished checking this one.
Checked
Checked means the company has since given an answer and we compared it with what was reported. Details still waiting on an answer, details nothing can settle, details where the plan itself changed, and details we have not finished reviewing are all counted separately and are not part of that number.
Moving target
A moving target is a report that described the plan accurately at the time, on a product the company then changed. We count these on their own: it would flatter a reporter to call them right, and it would blame a reporter for a decision that was not theirs to call them wrong.
Reported by
pdfu
We read it in
MacRumors
Product
Apple Watch Series 12
Read it at MacRumors

The story of this report

  1. Sep 7, 2026pdfu reported it · MacRumors
  2. Sep 9, 2026Apple Watch Series 12 was announced · official source
  3. VerdictPartly rightWhat it means, and why, is in the box above.

Who reported it

pdfu · Leaker

4 reports in the Reporting Record. Of the 2 we have checked, 2 held up. The other 2 are not part of that number: 2 no outcome yet.

Every report from pdfu

What we know now

Our stories about Apple Watch Series 12

Other reports about Apple Watch Series 12

29 reports about Apple Watch Series 12 from 10 sources. Of the 9 we have checked, 5 held up.

See all 29 reports about Apple Watch Series 12

Other claims sourced to the same article

The article above is cited on these roadmap entries too. That is a shared source, not a statement that this report was about them.

Questions about this report

How much storage does the Apple Watch Series 12 have?
Partly right. Some of this was right and some of it was not. The Readiness app shipped on Apple Watch, as this code find said. The Sunstone4p0 sensor family and the 128GB storage tier are not confirmed by anything Apple announced, so two of the three findings remain unchecked.
Who reported it first?
pdfu reported it on Sep 7, 2026 in MacRumors.
How far ahead of the announcement was it?
That was 2 days before Apple Watch Series 12 was announced on Sep 9, 2026.