What are some underrated iPhone apps that more people should know about?

I’m looking to discover useful iPhone apps that aren’t very well known or talked about.
I’m not necessarily looking for popular apps like Instagram, Spotify or YouTube. I’m more interested in hidden gems that are genuinely useful in everyday life.
What are some underrated apps you personally use and recommend?
I’d love to discover apps for:
Productivity
Automation
Travel and navigation
Utilities
Organization
Anything unusual but genuinely useful!
Feel free to share apps that you think deserve much more attention. I’d also love to hear what makes them special!

MinimumTreat954 Going to put up Mina: Our Memories. I built it for my wife as a keepsake for the two of us, a private place where our memories and the little things we do together are kept properly and put out there for us, with letters sealed for a future date and a jar that picks our next date night. It's the kind of thing you keep for the two of you, not for a feed.

https://apps.apple.com/app/id6826405951 Yesterday

LearnToPass Started using this a few days ago and my girlfriend is in love with this. Shes sentimental and loves the way it captures all of our moments. Happy girl happy world Yesterday 2 likes

app-store-review **Mina: Our Memories** — by Osman Ali Mudei

- **Ratings:** 4 worldwide
- **Average:** 5.00 ★
- **Age:** released ~1 month ago · updated 2 days ago · rated 12+
- **Overall score:** 74 / 100

^(Auto-generated from public App Store data · u/app-store-review) Yesterday 1 like

[deleted] [removed] Yesterday

app-store-review **Keel: Subscription Tracker** — by Maxime Teuber

- **Ratings:** 3 worldwide · rated in 3 countries
- **Average:** 5.00 ★
- **Age:** released ~1 month ago · updated 2 days ago · rated 4+
- **Overall score:** 73 / 100

^(Auto-generated from public App Store data · u/app-store-review) Yesterday 1 like