In the case of iStat, I am referring to a much older version which I do not believe is available on the app store for those who did not previously download it.

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If you want app support go to iOS 9, most current apps run on it.

I downgraded my old 4s for nostalgic sake and I can confirm that Netflix, YouTube, and Spotify run.

The YouTube app doesnt even work, they blocked it a few weeks ago.

Yeah you have to balance whats more important to you, performance or features.

Sounds like OP wants performance and apps that run, rather than features.

Personally I find iOS 6 is fun to play with for a bit, but iOS 9 has far more utility in current times regardless of poor performance.

Completely useless device unless you have the patience of a saint.

I just had to put my 4S from iOS 6 to iOS 9 in an attempt to use it as a backup phone, but it was so abysmally slow and laggy that it was just a brick.

For me, I found it surprising that Dropbox still works without a fuss Also, Instagram works (except for Direct Messages which stopped functioning sometime back in 2015 when they updated how DMs work) Now with YouTube its usable on iOS 6 but, somewhat a hassle to get working.

If you close the app or, it crashes, youll get a message that says update to continue.

Being on iOS 6, youll be stuck in a loop with the app when the message appears.

However, I found a funny glitch for users can who arnt jailbroken to bypass the issue If you open the app and it displays the update to continue message, you can delete the app and re-download it from the App store.

As long as you dont close out off the app or it does not crash, you can still watch videos you subscribed to (As of last week, I can no longer comment on a video or add any new videos to a existing playlist.

Ive probably re-downloaded the app over 100 times on my 4th gen iPod Touch since Spring Break when this issue popped up on my end.

I linked a forum discussing the jailbreak bypass method bellow.

Dropbox works. Google app works.

My Alarm Clock (digital clock app) works and iStat works.

Games For Ios 6.1.6