What is the best alternative to Google Photos: Backup & Edit on iPhone?

Photos, B tier, #2 in photo viewing.

Is there a free alternative to Google Photos: Backup & Edit?

Yes: Photos (B tier, #2) is free, with no in-app purchases.

No. Google Photos: Backup & Edit is #1 in photo viewing.

Google Photos: Backup & Edit is S tier, #1 of 6 in photo viewing. Here is everything that competes with it on iPhone, in tier order.

2
PhotosB
Free · ★ 3.1 · 15,888 ratings · score 78
Built-in app for browsing, searching, editing, and sharing photos and videos stored on your device and in iCloud.
3
HuntSmart: Trail Cam AppC
Free download · ★ 4.5 · 12,488 ratings · score 68
Free app for viewing, managing, and configuring Wildgame Innovations cellular trail cameras, with photos, video, and.
4
Photo Gallery - Gallery LockC
Free + IAP · ★ 4.5 · 4,598 ratings · score 66
Photo and video gallery with albums, slideshows, sharing, and password-protected, encrypted hiding of private files.
5
Gallery - Private Photo VaultC
Free download · ★ 4.5 · 3,519 ratings · score 62
Photo and video viewer with albums, an encrypted Gallery Lock for private media, and basic editing and sharing tools.
6
Gallery : Media File ManagerD
Free + IAP · ★ 4.3 · 104 ratings · score 51
Browses photos, videos and music files by folder or type, and finds and deletes similar images or videos.

What is the best alternative to Google Photos: Backup & Edit on iPhone?: Photos, B tier, #2 in photo viewing.
Is there a free alternative to Google Photos: Backup & Edit?: Yes: Photos (B tier, #2) is free, with no in-app purchases.
Does anything rank above Google Photos: Backup & Edit?: No. Google Photos: Backup & Edit is #1 in photo viewing.