KMail vs Missive

KMail8.9Visit Missive8.5Visit

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

vs

Missive #9 in Email Clients 8.5/10 30-day trial Free trial✓ 4 of 4 features Visit Missive

• KMail fits best

  Linux users wanting a mature open-source client

• Missive fits best

  Teams managing shared customer conversations

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	KMail 8.9/10 Visit ↗	Missive 8.5/10 Visit ↗
At a glance
Editor score	8.9	8.5
Ranking	#5 in Email Clients	#9 in Email Clients
Best for	Linux users wanting a mature open-source client	Teams managing shared customer conversations
Pricing model	Free	Paid
Starting price	Free plan	$14/user/mo
Free plan	✓ (best)	—
Free trial	—	30 days
Deployment	Desktop	Cloud, Desktop, Mobile
Platforms	Linux	Web, Windows, macOS, iOS, Android
Support	Email, Live chat, Community, Docs	Email, Docs
Integrations	4 integrations	16 integrations
Built for	Solo, Small business, Mid-market	Small business, Mid-market, Enterprise
Features KMail 4/4 · Missive 4/4
Unified inbox	✓	✓
Offline access	✓	✓
Scheduled sending	✓	✓
Calendar tools	✓	✓
Specs
App coverage	Desktop	All
Account limit	Not checked yet	15 accounts
Our review
Pros	Supports IMAP, POP3, SMTP and Microsoft Exchange OpenPGP, PGP/MIME and S/MIME support Offline access, filtering, search and scheduled sending	Shared inboxes support assignments, comments, mentions, and chat Unifies email, SMS, WhatsApp, Instagram, and Messenger Adds tasks, calendars, automations, and AI-assisted inbox actions
Cons	Available on Linux rather than across multiple operating systems Unified mailbox requires a plugin disabled by default Desktop-focused app coverage	No free plan after the 30-day trial Paid tiers are priced per user and billed annually Advanced security controls start on Business
Our verdict	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 →	Missive is a collaborative email client for customer support teams, sales teams, and agencies that need to manage shared customer conversations. It combines email with SMS, WhatsApp, Instagram, Messenger, and other channels in shared… Read the review →

Strengths and trade-offs

• 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

• Missive — where it wins

  • Shared inboxes support assignments, comments, mentions, and chat
  • Unifies email, SMS, WhatsApp, Instagram, and Messenger
  • Adds tasks, calendars, automations, and AI-assisted inbox actions

  Where it doesn't

  • No free plan after the 30-day trial
  • Paid tiers are priced per user and billed annually
  • Advanced security controls start on Business

• KMail8.9/10 · Free plan

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

  Visit KDEFull verdict →
• Missive8.5/10 · 30-day trial

  A shared-inbox email client for teams coordinating customer conversations across channels.

  Visit MissiveFull verdict →