What is the best alternative to Beat Looper Pro - Music Maker on iPhone?

Jam Looper, S tier, #1 in music looping.

Is there a free alternative to Beat Looper Pro - Music Maker?

Yes: Jam Looper (S tier, #1) is free to download, with in-app purchases.

Yes. 3 apps rank above it in music looping: Jam Looper (#1), Remixlive - Make Music & Beats (#2), GarageBand (#3).

Beat Looper Pro - Music Maker is C tier, #4 of 6 in music looping. Here is everything that competes with it on iPhone, in tier order.

1
Jam LooperShigher tier
Free + IAP · ★ 4.4 · 2,386 ratings · score 88
Jam Looper is a free Music app for recording looped tracks, adjusting volume per track, and exporting your jams.
2
Remixlive - Make Music & BeatsBhigher tier
Free + IAP · ★ 4.7 · 12,694 ratings · score 79
Loop-based beat making and live performance app with 48 loops, real-time key and tempo control, FX, and a sample…
3
GarageBandBhigher tier
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.
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 · 2,307 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 Beat Looper Pro - Music Maker on iPhone?: Jam Looper, S tier, #1 in music looping.
Is there a free alternative to Beat Looper Pro - Music Maker?: Yes: Jam Looper (S tier, #1) is free to download, with in-app purchases.
Does anything rank above Beat Looper Pro - Music Maker?: Yes. 3 apps rank above it in music looping: Jam Looper (#1), Remixlive - Make Music & Beats (#2), GarageBand (#3).