What is the best alternative to Whistle on Tap on iPhone?

iTrainer Dog Whistle & Clicker, S tier, #1 in whistle sounds.

Is there a free alternative to Whistle on Tap?

Yes: iTrainer Dog Whistle & Clicker (S tier, #1) is free to download, with in-app purchases.

Yes. 3 apps rank above it in whistle sounds: iTrainer Dog Whistle & Clicker (#1), Dog Translator: Pet/Human Talk (#2), Dog Play & Whistle Games (#3).

Whistle on Tap is C tier, #4 of the 6 tiered apps in whistle sounds. Here is everything that competes with it on iPhone, in tier order.

1
iTrainer Dog Whistle & ClickerShigher tier
Free + IAP · ★ 4.5 · 37,989 ratings · score 81
Dog whistle, clicker, squeaker and animal sound app for pet training and distraction.
2
Dog Translator: Pet/Human TalkBhigher tier
Free + IAP · ★ 4.2 · 4,209 ratings · score 74
Dog app with playful sound features, clicker and whistle, training lessons, articles, and a general AI assistant.
3
Dog Play & Whistle GamesBhigher tier
Free + IAP · ★ 4.3 · 5,591 ratings · score 71
Sound-play and ultrasonic whistle app for playing with a dog or puppy and training it with commands.
5
Dog Whistler:Whistle & ClickerD
Free + IAP · ★ 3.6 · 2,767 ratings · score 58
Plays adjustable high-pitched whistle, tone, beep and clicker sounds for dog training, simple hearing checks and pranks.
6
Cat Emotions: Sounds to PetF
Free + IAP · ★ 4.5 · 2,162 ratings · score 38
Free entertainment app with cat and dog sounds, a pet emotions feature, a whistle, and pet care courses.

What is the best alternative to Whistle on Tap on iPhone?: iTrainer Dog Whistle & Clicker, S tier, #1 in whistle sounds.
Is there a free alternative to Whistle on Tap?: Yes: iTrainer Dog Whistle & Clicker (S tier, #1) is free to download, with in-app purchases.
Does anything rank above Whistle on Tap?: Yes. 3 apps rank above it in whistle sounds: iTrainer Dog Whistle & Clicker (#1), Dog Translator: Pet/Human Talk (#2), Dog Play & Whistle Games (#3).