Spark Mail vs KMail

Spark Mail9.0Visit KMail8.9Visit

Higher score Spark Mail #4 in Email Clients 9.0/10 Free plan · 7-day trial Free planFree trial✓ 4 of 4 features Visit Spark Mail

vs

KMail #5 in Email Clients 8.9/10 Free plan Free plan✓ 4 of 4 features Visit KDE

• Spark Mail fits best

  Teams needing collaborative email workflows

• KMail fits best

  Linux users wanting a mature open-source client

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Side by side

Feature	Spark Mail 9.0/10 Visit ↗	KMail 8.9/10 Visit ↗
At a glance
Editor score	9.0	8.9
Ranking	#4 in Email Clients	#5 in Email Clients
Best for	Teams needing collaborative email workflows	Linux users wanting a mature open-source client
Pricing model	Free plan + paid	Free
Starting price	$99/user/yr	Free plan
Free plan	✓	✓
Free trial	7 days	—
Deployment	Cloud, Desktop, Mobile	Desktop
Platforms	Windows, macOS, iOS, Android	Linux
Support	Live chat, Docs	Email, Live chat, Community, Docs
Integrations	20 integrations	4 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features Spark Mail 4/4 · KMail 4/4
Unified inbox	✓	✓
Offline access	✓	✓
Scheduled sending	✓	✓
Calendar tools	✓	✓
Specs
App coverage	Not checked yet	Desktop
Account limit	Not checked yet	Not checked yet
Our review
Pros	Unified inbox, Smart Inbox, search, scheduling, and calendar tools Shared inboxes, drafts, assignments, and private team comments Available on macOS, Windows, iOS, and Android	Supports IMAP, POP3, SMTP and Microsoft Exchange OpenPGP, PGP/MIME and S/MIME support Offline access, filtering, search and scheduled sending
Cons	Offline management is limited beyond reading cached emails and attachments Advanced collaboration features require a paid plan Plus limits AI Meeting Notes to 40	Available on Linux rather than across multiple operating systems Unified mailbox requires a plugin disabled by default Desktop-focused app coverage
Our verdict	Spark Mail is an email client for individuals, professionals, and teams that manage multiple accounts and need more structured workflows. It brings accounts from IMAP, iCloud, Exchange, Outlook, Yahoo, and Google into a unified inbox,… Read the review →	KMail is an open-source desktop email client developed within the KDE community. It is designed for Linux users who want a configurable application for managing multiple mail accounts locally. The client supports IMAP, POP3, SMTP and… Read the review →

Strengths and trade-offs

• Spark Mail — where it wins

  • Unified inbox, Smart Inbox, search, scheduling, and calendar tools
  • Shared inboxes, drafts, assignments, and private team comments
  • Available on macOS, Windows, iOS, and Android

  Where it doesn't

  • Offline management is limited beyond reading cached emails and attachments
  • Advanced collaboration features require a paid plan
  • Plus limits AI Meeting Notes to 40

• KMail — where it wins

  • Supports IMAP, POP3, SMTP and Microsoft Exchange
  • OpenPGP, PGP/MIME and S/MIME support
  • Offline access, filtering, search and scheduled sending

  Where it doesn't

  • Available on Linux rather than across multiple operating systems
  • Unified mailbox requires a plugin disabled by default
  • Desktop-focused app coverage

• Spark Mail9.0/10 · Free plan · 7-day trial

  A capable cross-platform email client for teams that need shared workflows.

  Visit Spark MailFull verdict →
• KMail8.9/10 · Free plan

  A mature, configurable Linux email client with broad protocols and offline access.

  Visit KDEFull verdict →