What is the best alternative to LearnEnglish Grammar (UK ed.) on iPhone?

Grammar Fix, B tier, #2 in grammar learning.

Is there a free alternative to LearnEnglish Grammar (UK ed.)?

Yes: Grammar Fix (B tier, #2) is free to download, with in-app purchases.

No. LearnEnglish Grammar (UK ed.) is #1 in grammar learning.

LearnEnglish Grammar (UK ed.) is S tier, #1 of 6 in grammar learning. Here is everything that competes with it on iPhone, in tier order.

2
Grammar FixB
Free + IAP · ★ 4.8 · 1,822 ratings · score 76
Teaches the 10 most common grammar mistakes, with each one covered in as little as 10 minutes.
3
ConjuGato: Learn Spanish VerbsC
Free download · ★ 4.9 · 4,198 ratings · score 68
Spanish verb conjugation quiz app with spaced repetition, audio, conjugation tables, and grammar quizzes.
4
IVERBS Irregular VerbsC
Free + IAP · ★ 4.8 · 3,287 ratings · score 68
IOS app for learning English irregular verbs, with illustrations, native speaker audio, exercises, flash-cards and a.
5
German Verb ConjugatorC
Free download · ★ 4.8 · 1,954 ratings · score 67
Looks up German verb conjugations across 16 tenses for 2100 verbs, with audio, example sentences and flashcards.
6
Learn Japanese: SenseiD
Free download · ★ 4.9 · 1,872 ratings · score 53
Free Japanese grammar course with 69 lessons and exercises, based on Tae Kim's popular grammar guide.

What is the best alternative to LearnEnglish Grammar (UK ed.) on iPhone?: Grammar Fix, B tier, #2 in grammar learning.
Is there a free alternative to LearnEnglish Grammar (UK ed.)?: Yes: Grammar Fix (B tier, #2) is free to download, with in-app purchases.
Does anything rank above LearnEnglish Grammar (UK ed.)?: No. LearnEnglish Grammar (UK ed.) is #1 in grammar learning.