What is the best alternative to Canary Mail - AI Email on iPhone?

Spark Mail: AI Email Assistant, S tier, #1 in email writing.

Is there a free alternative to Canary Mail - AI Email?

Yes: Spark Mail: AI Email Assistant (S tier, #1) is free to download.

Yes. 1 app ranks above it in email writing: Spark Mail: AI Email Assistant (#1).

Canary Mail - AI Email is A tier, #2 of 6 in email writing. Here is everything that competes with it on iPhone, in tier order.

1
Spark Mail: AI Email AssistantShigher tier
Free download · ★ 4.6 · 82,695 ratings · score 94
Email app that combines multiple accounts into one inbox and surfaces priority messages first.
3
Superhuman MailA
Free · ★ 4.6 · 3,711 ratings · score 88
Email app for Gmail and Outlook with AI draft replies, inbox splits, automatic reminders, and HubSpot and Salesforce.
4
Friday AI Email WriterA
Free + IAP · ★ 4.8 · 9,794 ratings · score 87
AI assistant that drafts emails and letters, proofreads text, and suggests writing edits from typed or voice input.
5
AI Writer: Email Letter EssayA
Free + IAP · ★ 4.8 · 6,639 ratings · score 87
Free iOS app listed as Reference that generates writing for emails, letters and essays using AI, with voice dictation.
6
ParagraphAI: Writer & KeyboardB
Free + IAP · ★ 4.8 · 2,523 ratings · score 79
Free AI writing assistant and AI keyboard for drafting, editing, summarizing and translating text in 40+ languages.

What is the best alternative to Canary Mail - AI Email on iPhone?: Spark Mail: AI Email Assistant, S tier, #1 in email writing.
Is there a free alternative to Canary Mail - AI Email?: Yes: Spark Mail: AI Email Assistant (S tier, #1) is free to download.
Does anything rank above Canary Mail - AI Email?: Yes. 1 app ranks above it in email writing: Spark Mail: AI Email Assistant (#1).