What is the best alternative to CuriosityStream on iPhone?

MagellanTV Documentaries, S tier, #2 in documentary streaming.

Is there a free alternative to CuriosityStream?

Yes: MagellanTV Documentaries (S tier, #2) is free to download.

No. CuriosityStream is #1 in documentary streaming.

CuriosityStream is S tier, #1 of 8 in documentary streaming. Here is everything that competes with it on iPhone, in tier order.

2
MagellanTV DocumentariesS
Free download · ★ 4.6 · 3,879 ratings · score 92
Documentary streaming app with genre collections in History, Nature, Science, Space and Crime, offered as a membership.
3
KanopyS
Free · ★ 4.8 · 152,417 ratings · score 91
Streams films and documentaries free of ads through a public library card sign-up.
4
PBS: Watch TV & DocumentariesS
Free download · ★ 4.9 · 356,455 ratings · score 89
Free app for streaming PBS TV series, films, documentaries, and news, including live local PBS station TV.
5
TrueShort - Stream True CrimeS
Free + IAP · ★ 4.9 · 18,330 ratings · score 89
Short-form true crime documentary series of 60-second episodes, presented as vertical video for mobile phones.
6
discovery+ | Stream TV ShowsA
Free + IAP · ★ 4.9 · 918,725 ratings · score 87
Streaming app with original series and shows from brands including HGTV, Food Network, TLC and Discovery Channel.
7
Gaia: Streaming ConsciousnessB
Free + IAP · ★ 4.8 · 140,954 ratings · score 72
Streaming app with films, original shows, yoga, meditation and documentaries on personal growth, metaphysics and…
8
Thirteen ExploreD
Free download · ★ 4.8 · 6,081 ratings · score 51
Free iPhone and iPad app for streaming full episodes of THIRTEEN and PBS programs, with New York-focused shows and a.

What is the best alternative to CuriosityStream on iPhone?: MagellanTV Documentaries, S tier, #2 in documentary streaming.
Is there a free alternative to CuriosityStream?: Yes: MagellanTV Documentaries (S tier, #2) is free to download.
Does anything rank above CuriosityStream?: No. CuriosityStream is #1 in documentary streaming.