What is the best alternative to Hisn - حصن on iPhone?

Dhikr & Dua - ذكر و دعاء, S tier, #1 in dhikr practice.

Is there a free alternative to Hisn - حصن?

Yes: Dhikr & Dua - ذكر و دعاء (S tier, #1) is free, with no in-app purchases.

Yes. 5 apps rank above it in dhikr practice: Dhikr & Dua - ذكر و دعاء (#1), Adhkar - Morning & Evening (#2), Dua & Azkar (#3) and more.

Hisn - حصن is F tier, #6 of 6 in dhikr practice. Here is everything that competes with it on iPhone, in tier order.

1
Dhikr & Dua - ذكر و دعاءShigher tier
Free · ★ 4.9 · 12,631 ratings · score 95
Free Reference app with 500+ dhikr and duas, translation, transliteration, audio, a counter, and over 100 articles.
2
Adhkar - Morning & EveningAhigher tier
Free download · ★ 4.4 · 3,191 ratings · score 87
IOS app for morning and evening adhkar with guided reading, a misbaha counter, audio, Hisn al-Muslim duas, and a Quran.
3
Dua & AzkarBhigher tier
Free download · ★ 4.8 · 8,922 ratings · score 73
Reference app with Duas and Adhkar grouped into chapters, with Arabic, Bangla and Urdu translations and daily reminders.
4
Adhkar AppChigher tier
Free · ★ 4.9 · 654 ratings · score 65
Free iOS app for tracking daily morning, evening and night adhkar, with location-based reminders and an optional…
5
iAzkar - آي أذكارDhigher tier
Free · ★ 4.7 · 5,762 ratings · score 55
Arabic Islamic app that displays daily athkar in five sections, with background audio and morning and evening.

What is the best alternative to Hisn - حصن on iPhone?: Dhikr & Dua - ذكر و دعاء, S tier, #1 in dhikr practice.
Is there a free alternative to Hisn - حصن?: Yes: Dhikr & Dua - ذكر و دعاء (S tier, #1) is free, with no in-app purchases.
Does anything rank above Hisn - حصن?: Yes. 5 apps rank above it in dhikr practice: Dhikr & Dua - ذكر و دعاء (#1), Adhkar - Morning & Evening (#2), Dua & Azkar (#3) and more.