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If it's not in the app store, then either the company that wrote the app doesn't make a version for IPhones or they didn't make it available in your region of the world.

Contact the app developer and ask them. It's not about Apple not supporting the app, it's about the company making a version for iPhones.

https://apps.apple.com/tr/app/mhrs/id1539508996?l=tr