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Head-to-head · AI Email Assistants

Spark +AI vs Mailbutler Smart Assistant

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score Spark +AI #1 in AI Email Assistants 9.2/10 Free plan · 7-day trial Free planFree trial✓ 4 of 5 features Visit Spark
Mailbutler Smart Assistant #3 in AI Email Assistants 8.6/10 Free plan · 14-day trial Free planFree trial✓ 4 of 5 features Visit Mailbutler

Spark +AI leads on 0 checks, Mailbutler Smart Assistant on 1, and 6 are even. Who comes out ahead on the 7 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSpark +AI · 9.2/10
  • Lowest starting priceMailbutler Smart Assistant · $7/user/mo
  • Free planboth
  • Free trialboth

Spark +AI scores higher on our rubric for ai email assistants: 9.2 against 8.6 out of 10; our editors rank them #1 and #3.

Mailbutler Smart Assistant is cheaper to start at $7/user/mo against $10/user/mo.

Spark +AI is the better fit for people who want AI help across everyday email tasks. Mailbutler Smart Assistant is the better fit for affordable email productivity across major platforms.

  • Spark +AI fits best

    People who want AI help across everyday email tasks

  • Mailbutler Smart Assistant fits best

    Affordable email productivity across major platforms

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Spark +AI 9.2/10 Visit ↗ Mailbutler Smart Assistant 8.6/10 Visit ↗
At a glance
Editor score 9.2 8.6
Ranking #1 in AI Email Assistants #3 in AI Email Assistants
Best for People who want AI help across everyday email tasks Affordable email productivity across major platforms
Pricing model Free plan + paid Free plan + paid
Starting price $10/user/mo $7/user/mo (best)
Free plan ✓ ✓
Free trial 7 days 14 days
Free trial length 7 days 14 days
Deployment Desktop, Mobile Cloud, Desktop, Mobile, Browser extension
Platforms macOS, Windows, iOS, Android Web, Windows, macOS, Linux, iOS, Android, Chrome extension
Integrations 14 integrations 5 integrations
Features Spark +AI 4/5 · Mailbutler Smart Assistant 4/5
Inbox triage ✓ ✓
AI reply drafting ✓ ✓
Automatic sending — —
Thread summaries ✓ ✓
Follow-up actions ✓ ✓
Specs
Email platforms Other Not checked yet
Our review
Pros
  • Drafts, rewrites, proofreads, translates, and summarizes email
  • Searches email, attachments, calendar, and meeting notes
  • Available on macOS, Windows, iOS, and Android
  • Drafts keyword-based messages and context-aware replies
  • Summarizes email and identifies actionable tasks
  • Works with Apple Mail, Gmail, and Microsoft Outlook
Cons
  • The Free plan highlights do not include Spark +AI or AI Assistant
  • Plus includes 40 AI Meeting Notes; unlimited notes require Pro
  • Drafts need user review; automatic sending without approval is not supported
  • Smart Assistant requires Smart or Business after the 14-day trial
  • Starter emails carry a visible Mailbutler watermark
  • No automatic email sending
Our verdict

Spark +AI is the AI feature set within Readdle’s Spark email client, aimed at individuals and teams who want help with routine email work. It covers drafting and quick replies, proofreading, rewriting, tone adjustment, translation, and…

Read the review →

Mailbutler Smart Assistant adds AI drafting, replies, summaries, and task detection to an email productivity toolkit. It is aimed at people who want help composing and organizing email across Apple Mail, Gmail, or Microsoft Outlook,…

Read the review →
  1. Spark +AIAI Email Assistants 9.2Free plan · 7-day trial
  2. Mailbutler Smart AssistantAI Email Assistants 8.6Free plan · 14-day trial

Strengths and trade-offs

  • Spark +AI — where it wins

    • Drafts, rewrites, proofreads, translates, and summarizes email
    • Searches email, attachments, calendar, and meeting notes
    • Available on macOS, Windows, iOS, and Android

    Where it doesn't

    • The Free plan highlights do not include Spark +AI or AI Assistant
    • Plus includes 40 AI Meeting Notes; unlimited notes require Pro
    • Drafts need user review; automatic sending without approval is not supported

  • Mailbutler Smart Assistant — where it wins

    • Drafts keyword-based messages and context-aware replies
    • Summarizes email and identifies actionable tasks
    • Works with Apple Mail, Gmail, and Microsoft Outlook

    Where it doesn't

    • Smart Assistant requires Smart or Business after the 14-day trial
    • Starter emails carry a visible Mailbutler watermark
    • No automatic email sending
  • Spark +AI9.2/10 · Free plan · 7-day trial

    A broad AI email toolkit across four platforms, with paid AI features starting at $10 per user monthly.

    Visit SparkFull verdict →
  • Mailbutler Smart Assistant8.6/10 · Free plan · 14-day trial

    A broad email toolkit with AI assistance on Smart and Business plans.

    Visit MailbutlerFull verdict →

More comparisons

All AI email assistants comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update