Not sure if you're on iOS, but Apollo is a very well built third-party Reddit client. It's about 70MB to install, and lets you clear the data cache if you're concerned about storage. You can also browse without an account.
Apollo is a breath of fresh air, but iOS rules for having a website link open in an app are extremely convoluted and require explicit hard-code dapproval from both the domain owner and app author, meaning even if you man-in-the-middle reddit.com on your intranet to provide the required headers/metafiles, you would need Apollo's author to also add reddit.com to the list of URLs the app is capable of intercepting. Yuck.
https://developer.apple.com/documentation/safariservices/saf...
That's using their modern extension model, so you could compile it onto your device yourself for testing. The WWDC talk is here: https://developer.apple.com/videos/play/wwdc2020/10665/
It might be possible to ask Apollo to include this, by providing something like the above comments as a feature request. I'm not sure what Apple would think during app review, and Apollo might not be willing to risk it.
Slide is the best Android app I ever used and it's FOSS too, available on FDroid.