What is the best alternative to Jam Looper on iPhone?

Remixlive - Make Music & Beats, B tier, #2 in music looping.

Is there a free alternative to Jam Looper?

Yes: Remixlive - Make Music & Beats (B tier, #2) is free to download, with in-app purchases.

No. Jam Looper is #1 in music looping.

Jam Looper is S tier, #1 of 6 in music looping. Here is everything that competes with it on iPhone, in tier order.

2
Remixlive - Make Music & BeatsB
Free + IAP · ★ 4.7 · 12,694 ratings · score 78
Loop-based beat making and live performance app with 48 loops, real-time key and tempo control, FX, and a sample…
3
GarageBandB
Free · ★ 4.1 · 117,865 ratings · score 78
Music creation app for iPhone and iPad with Touch Instruments, Live Loops, and a multitrack recording studio.
4
Beat Looper Pro - Music MakerC
Free + IAP · ★ 4.7 · 35,506 ratings · score 68
Music app with pads and loops for making beats and remixes in styles such as hip-hop, trap, EDM, techno and house.
5
Music Making Studio • SamplerC
Free + IAP · ★ 4.6 · 7,072 ratings · score 68
Free music app for layering loops and sound packs into tracks and songs, with filter, reverb and delay effects.
6
Blocs Wave: Record Music LiveD
Free + IAP · ★ 4.8 · 2,306 ratings · score 59
IOS music app for making, recording, slicing and looping music with touchable waveforms and a built-in sound library.

What is the best alternative to Jam Looper on iPhone?: Remixlive - Make Music & Beats, B tier, #2 in music looping.
Is there a free alternative to Jam Looper?: Yes: Remixlive - Make Music & Beats (B tier, #2) is free to download, with in-app purchases.
Does anything rank above Jam Looper?: No. Jam Looper is #1 in music looping.