What is the best alternative to Quit smoking for good - Kwit on iPhone?

Quit Smoking --~ Smoke Free, S tier, #1 in smoking cessation.

Is there a free alternative to Quit smoking for good - Kwit?

Yes: Quit Smoking --~ Smoke Free (S tier, #1) is free to download, with in-app purchases.

Yes. 3 apps rank above it in smoking cessation: Quit Smoking --~ Smoke Free (#1), QuitNow (#2), Smoke Free - Quit Smoking Now (#3).

Quit smoking for good - Kwit is S tier, #4 of 6 in smoking cessation. Here is everything that competes with it on iPhone, in tier order.

1
Quit Smoking --~ Smoke FreeS
Free + IAP · ★ 4.7 · 11,444 ratings · score 94
Quit smoking app with tools for tracking progress, cravings, daily tasks, savings goals, and tips from former smokers.
2
QuitNowS
Free + IAP · ★ 4.7 · 13,621 ratings · score 93
Tracks smoke-free progress and milestones, with a quit course, ex-smoker chat and monthly expert sessions.
3
Smoke Free - Quit Smoking NowS
Free + IAP · ★ 4.8 · 57,278 ratings · score 92
Free app with evidence-based techniques to help users quit smoking, tracking progress, cravings, and savings.
5
quitSTART - Quit SmokingA
Free · ★ 4.6 · 2,424 ratings · score 89
Free app that gives tailored quit-smoking tips, challenges, and milestone badges based on your smoking history.
6
My Last CigaretteB
Free download · ★ 4.5 · 1,927 ratings · score 71
Quit smoking tracker that shows estimated health, savings and craving readouts based on your past smoking habits.

What is the best alternative to Quit smoking for good - Kwit on iPhone?: Quit Smoking --~ Smoke Free, S tier, #1 in smoking cessation.
Is there a free alternative to Quit smoking for good - Kwit?: Yes: Quit Smoking --~ Smoke Free (S tier, #1) is free to download, with in-app purchases.
Does anything rank above Quit smoking for good - Kwit?: Yes. 3 apps rank above it in smoking cessation: Quit Smoking --~ Smoke Free (#1), QuitNow (#2), Smoke Free - Quit Smoking Now (#3).