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Head-to-head · AI Email Assistants

Spark +AI vs Spike

  • 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
Spike #8 in AI Email Assistants 7.9/10 Free plan Free plan✓ 0 of 5 features Visit Spike

Spark +AI leads on 0 checks, Spike 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 priceSpike · $4/user/mo
  • Free planboth
  • Free trialonly Spark +AI
  • Most featuresSpark +AI · 4 of 5

Spark +AI scores higher on our rubric for ai email assistants: 9.2 against 7.9 out of 10; our editors rank them #1 and #8.

Spike is cheaper to start at $4/user/mo against $10/user/mo.

Spark +AI is the better fit for people who want AI help across everyday email tasks. Spike is the better fit for low-cost email and calendar workspace.

  • Spark +AI fits best

    People who want AI help across everyday email tasks

  • Spike fits best

    Low-cost email and calendar workspace

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 ↗ Spike 7.9/10 Visit ↗
At a glance
Editor score 9.2 7.9
Ranking #1 in AI Email Assistants #8 in AI Email Assistants
Best for People who want AI help across everyday email tasks Low-cost email and calendar workspace
Pricing model Free plan + paid Free plan + paid
Starting price $10/user/mo $4/user/mo (best)
Free plan ✓ ✓
Free trial 7 days —
Deployment Desktop, Mobile Cloud, Desktop, Mobile
Platforms macOS, Windows, iOS, Android Web, Windows, macOS, iOS, Android
Integrations 14 integrations 12 integrations
Features Spark +AI 4/5 · Spike 0/5
Inbox triage ✓ (best) Not checked yet
AI reply drafting ✓ (best) Not checked yet
Automatic sending — Not checked yet
Thread summaries ✓ (best) Not checked yet
Follow-up actions ✓ (best) Not checked yet
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
  • Chat-style threads and a unified inbox organize multiple email accounts.
  • AI drafting and conversation summaries are available on free plans.
  • Calendar tools, notes, tasks and calls sit alongside email.
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
  • The free Email App plan limits unified inbox use to one email address.
  • The $4 Team plan and $6 Pro plan serve different product offerings.
  • Video call recording and SAML-SSO are marked SOON on Business.
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 →

Spike combines email, calendar tools and collaboration features in a chat-style workspace. It is aimed at individuals who want to manage existing email accounts in one app, as well as teams that need shared inboxes and team spaces. AI…

Read the review →
  1. Spark +AIAI Email Assistants 9.2Free plan · 7-day trial
  2. SpikeAI Email Assistants 7.9Free plan

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

  • Spike — where it wins

    • Chat-style threads and a unified inbox organize multiple email accounts.
    • AI drafting and conversation summaries are available on free plans.
    • Calendar tools, notes, tasks and calls sit alongside email.

    Where it doesn't

    • The free Email App plan limits unified inbox use to one email address.
    • The $4 Team plan and $6 Pro plan serve different product offerings.
    • Video call recording and SAML-SSO are marked SOON on Business.
  • 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 →
  • Spike7.9/10 · Free plan

    Spike brings AI email tools, calendar features and team collaboration into one workspace.

    Visit SpikeFull 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