Are there any iOS apps that can store hidden photos in a “private vault” without breaching your privacy?

I used to use KeepSafe but they seem like a huge privacy risk considering in their policies it states:

“Unless you ask us to, we don't look at your photos, videos, passwords or anything else on your device”
- https://www.getkeepsafe.com/policies/#

However, that seems like a huge flaw as although they state they won’t look at the photos unless you give them permission, it’s the fact that they have the ability to view all your private photos in the first place …

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