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Head-to-head · AI Email Writing Tools

Kerna vs Demi

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Kerna #6 in AI Email Writing Tools 7.8/10 Free plan Free plan✓ 2 of 3 features Visit Kerna
Demi #7 in AI Email Writing Tools 7.7/10 Free plan · 7-day trial Free planFree trial✓ 0 of 3 features Visit Demi

Kerna leads on 0 checks, Demi on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreKerna · 7.8/10
  • Free planboth
  • Free trialonly Demi
  • Most featuresKerna · 2 of 3

Kerna scores higher on our rubric for ai email writing tools: 7.8 against 7.7 out of 10; our editors rank them #6 and #7.

Kerna is the better fit for multilingual email and inbox workflows. Demi is the better fit for mac users needing connected email assistance.

  • Kerna fits best

    Multilingual email and inbox workflows

  • Demi fits best

    Mac users needing connected email assistance

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Side by side

Feature Kerna 7.8/10 Visit ↗ Demi 7.7/10 Visit ↗
At a glance
Editor score 7.8 7.7
Ranking #6 in AI Email Writing Tools #7 in AI Email Writing Tools
Best for Multilingual email and inbox workflows Mac users needing connected email assistance
Pricing model Free plan + paid Free plan + paid
Starting price €12/mo $25/mo
Free plan ✓ ✓
Free trial — 7 days
Deployment Cloud Desktop
Platforms Web, Windows, macOS macOS
Support Email, Docs Email
Compliance GDPR SOC 2
Integrations 6 integrations 100+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Kerna 2/3 · Demi 0/3
Tone controls ✓ (best) Not checked yet
Custom instructions ✓ (best) Not checked yet
Browser extension — Not checked yet
Specs
Email context input Thread Thread
Mail client support Both Both
Supported languages 45 languages Not checked yet
Our review
Pros
  • Drafts replies and new messages with selectable tones and intents
  • Translates email in 45 languages and summarizes threads
  • Extracts data from emails and attachments for export to common office tools
  • Drafts replies and follow-ups in the user's writing style.
  • Connects email, calendars, CRMs, chat, documents, and calls.
  • Requires human approval before sending emails or changing records.
Cons
  • Starter, Standard and Pro plans are limited to one user
  • No browser extension is listed among its supported features
  • Usage is governed by monthly token allowances or shared token pools
  • Mac-only coverage limits access to macOS users.
  • Individual costs $25 per month with monthly billing.
  • Team pricing uses custom usage and procurement terms.
Our verdict

Kerna is an AI email assistant for people and organizations working in Gmail or Outlook. It drafts replies from email threads, composes new messages from topics or saved instructions, summarizes conversations, translates email in 45…

Read the review →

Demi is an AI email assistant for Mac users who want help managing Gmail or Outlook. It prioritizes important threads, drafts replies and follow-ups in the user's writing style, schedules meetings, and turns meeting context into next…

Read the review →
  1. KernaAI Email Writing Tools 7.8Free plan
  2. DemiAI Email Writing Tools 7.7Free plan · 7-day trial

Strengths and trade-offs

  • Kerna — where it wins

    • Drafts replies and new messages with selectable tones and intents
    • Translates email in 45 languages and summarizes threads
    • Extracts data from emails and attachments for export to common office tools

    Where it doesn't

    • Starter, Standard and Pro plans are limited to one user
    • No browser extension is listed among its supported features
    • Usage is governed by monthly token allowances or shared token pools

  • Demi — where it wins

    • Drafts replies and follow-ups in the user's writing style.
    • Connects email, calendars, CRMs, chat, documents, and calls.
    • Requires human approval before sending emails or changing records.

    Where it doesn't

    • Mac-only coverage limits access to macOS users.
    • Individual costs $25 per month with monthly billing.
    • Team pricing uses custom usage and procurement terms.
  • Kerna7.8/10 · Free plan

    A broad email workflow assistant for multilingual drafting, triage and extraction.

    Visit KernaFull verdict →
  • Demi7.7/10 · Free plan · 7-day trial

    A connected Mac email assistant for drafting, triage, scheduling, and context retrieval.

    Visit DemiFull verdict →

More comparisons

All AI email writing tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update