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Grammarly vs HeyGen

Features, pricing, ratings, and pros and cons, side by side.

Grammarly logo

Grammarly

AI writing assistant that corrects, rewrites and tone-checks your text across every app

Freemium
Visit websiteView details

Verdict

Grammarly is listed under AI Assistants and HeyGen under Video AI. Both have a free plan or trial. Only Grammarly is available on Windows, macOS and Chrome Extension. Only HeyGen is available on CLI.

Best overall

HeyGen

  • Marketing teams
  • Corporate training and L&D teams
  • Sales teams
  • Content creators

Choose Grammarly if

  • You want a tool built for polishing emails and documents in real time across many apps, keeping tone and style consistent across a team.
  • Works across desktop, browser, Office, Google Docs and mobile keyboards, so suggestions follow you between apps.
  • Free plan covers core grammar, spelling and tone visibility with 100 AI prompts per month.

Choose HeyGen if

  • You want a tool built for Avatar-presented training and explainer videos.
  • Free plan with no time limit, though capped at 3 videos a month.
  • Video Translation with voice preservation and lip-sync in 175+ languages.
Best for beginners
Grammarly
Best for business
Grammarly

Features

18 features compared.

  • Citation Tools
    Grammarly
    Available
    HeyGen
    Not available
  • Style Guides and Brand Tones
    Grammarly
    Available
    HeyGen
    Not available
  • Cross-App Availability
    Grammarly
    Available
    HeyGen
    Not available
  • Enterprise Security Controls
    Grammarly
    Available
    HeyGen
    Not available
  • Grammar and Mistake Correction
    Grammarly
    Available
    HeyGen
    Not available
  • Tone Detection and Adjustment
    Grammarly
    Available
    HeyGen
    Not available
  • Full-Sentence and Paragraph Rewrites
    Grammarly
    Available
    HeyGen
    Not available
  • AI Detector and Humanizer
    Grammarly
    Available
    HeyGen
    Not available
  • Plagiarism Checker
    Grammarly
    Available
    HeyGen
    Not available
  • AI Studio
    Grammarly
    Not available
    HeyGen
    Available
  • Avatars
    Grammarly
    Not available
    HeyGen
    Available
  • Video Translation
    Grammarly
    Not available
    HeyGen
    Available
  • Video Agent
    Grammarly
    Not available
    HeyGen
    Available
  • Multiple input types
    Grammarly
    Not available
    HeyGen
    Available
  • Voice cloning
    Grammarly
    Not available
    HeyGen
    Available
  • Interactive video and SCORM export
    Grammarly
    Not available
    HeyGen
    Available
  • Developer API
    Grammarly
    Not available
    HeyGen
    Available
  • Identity verification and moderation
    Grammarly
    Not available
    HeyGen
    Available

Pricing

Plans as listed by each vendor. Check their sites for current prices.

  • Pricing model
    Grammarly
    Freemium
    HeyGen
    Freemium
  • Free plan
    Grammarly
    Yes
    HeyGen
    Yes
  • Starting price
    Grammarly
    $0
    HeyGen
    $0
  • Plans
    Grammarly
    3 plans
    HeyGen
    5 plans

Grammarly plans

  • Free

    $0

    Basic writing help for individuals

    • Mistake correction
    • tone visibility
    • 100 AI prompts/month

  • Pro

    Most popular

    $30/month

    Individuals and eligible teams wanting advanced rewrites and detection

    • 2,000 AI prompts/member/month
    • tone adjustment
    • full-sentence rewrites
    • plagiarism detection
    • AI-generated text detection
    • style guide
    • brand tone
    • priority support

  • Enterprise

    Custom/custom

    Larger organizations with security and governance needs

    • Unlimited AI prompts
    • unlimited style guides and brand tones
    • SAML SSO
    • SCIM
    • audit logs API
    • data loss prevention
    • dedicated support

HeyGen plans

  • Free

    $0

    3 videos per month, up to 1 minute each

    • 1 custom avatar
    • 500+ stock avatars
    • 30+ languages
    • Up to 3 Photo Avatars
    • 1 voice clone
    • Standard processing

  • Creator

    Most popular

    $29/month

    600 credits per month, videos up to 30 minutes

    • Watermark removal
    • Unlimited Photo Avatars
    • Voice cloning
    • 175+ languages and dialects
    • Credit rollover
    • 700+ stock avatars
    • Fast processing

  • Pro

    $49/month

    From 1,000 credits per month, videos up to 30 minutes

    • Everything in Creator
    • 4K export
    • Faster processing
    • Customizable monthly usage
    • All advanced AI models
    • Editing of translated scripts

  • Business

    $149/month

    1,500 credits per month plus $20 per extra seat, videos up to 60 minutes

    • Team seats
    • Workspace collaboration
    • SAML/SSO
    • Centralized billing
    • 5+ custom avatars
    • Interactive video
    • SCORM export
    • LMS integrations
    • Credit packs or auto-reload

  • Enterprise

    Custom/custom

    Contact sales

    • No maximum video length
    • SCIM provisioning
    • MFA
    • Invoice billing
    • Priority support
    • Dedicated customer success manager
    • Custom onboarding

Our ratings

Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.

Grammarly
8.2overall
HeyGen
8.3overall

Grammarly leads in 2 categories and HeyGen in 0.

  • Ease of Use

    Grammarly leads by 0.6
    Grammarly
    9.1
    HeyGen
    8.5

  • Feature Depth

    Grammarly
    8.3
    HeyGen
    Not rated

  • Value for Money

    Grammarly leads by 0.3
    Grammarly
    7.3
    HeyGen
    7.0

  • Performance & Speed

    Grammarly
    8.4
    HeyGen
    Not rated

  • Documentation & Support

    Grammarly
    8.0
    HeyGen
    Not rated

  • Avatar Realism & Lip Sync

    Grammarly
    Not rated
    HeyGen
    9.0

  • Video Translation

    Grammarly
    Not rated
    HeyGen
    9.0

  • Developer & Team Features

    Grammarly
    Not rated
    HeyGen
    8.0

Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.

Pros and cons

Grammarly

Pros

  • Works across desktop, browser, Office, Google Docs and mobile keyboards, so suggestions follow you between apps.
  • Free plan covers core grammar, spelling and tone visibility with 100 AI prompts per month.
  • Pro adds tone adjustment, full-sentence rewrites, plagiarism and AI-text detection in a single subscription.
  • Team features include style guides, brand tones, analytics and user groups; Enterprise adds SSO, SCIM and audit logs.
  • Public REST APIs exist for analytics, licence management, writing score and detection.

Cons

  • Monthly billing for Pro is $30, versus $12 per month on annual billing, so month-to-month use costs 2.5 times as much.
  • Third-party tests of the AI Detector report notable false-positive rates (figures range from 14.2% to 34% across sources), so it is unreliable as proof.
  • An App Store reviewer criticizes the iOS keyboard setup for pushing users to grant broad access.
  • Experienced writers on forums report turning off many suggestions; advanced features are gated behind Pro.

HeyGen

Pros

  • Free plan with no time limit, though capped at 3 videos a month
  • Video Translation with voice preservation and lip-sync in 175+ languages
  • Text-based editor with Brand Kit, captions and multi-user editing
  • Custom avatars and voice cloning on every plan, including Free
  • Public API with CLI and MCP server, and iOS and Android apps
  • Business plan adds SAML/SSO, SCORM export and LMS integrations

Cons

  • Free plan limits videos to 1 minute and 3 per month
  • 4K export and advanced AI models need Pro at $49 per month or higher
  • Credit-based pricing makes the cost of a video depend on model, length and complexity
  • Business starts at $149 per month plus $20 for each extra seat
  • Android app is stated as available in the U.S. only

Platforms

  • Web
    Grammarly
    Supported
    HeyGen
    Supported
  • Windows
    Grammarly
    Supported
    HeyGen
    Not supported
  • macOS
    Grammarly
    Supported
    HeyGen
    Not supported
  • iOS
    Grammarly
    Supported
    HeyGen
    Supported
  • Android
    Grammarly
    Supported
    HeyGen
    Supported
  • API
    Grammarly
    Supported
    HeyGen
    Supported
  • Browser Extension
    Grammarly
    Not supported
    HeyGen
    Not supported
  • Chrome Extension
    Grammarly
    Supported
    HeyGen
    Not supported
  • Firefox Extension
    Grammarly
    Supported
    HeyGen
    Not supported
  • CLI
    Grammarly
    Not supported
    HeyGen
    Supported

Integrations

Grammarly

7 integrations
  • Microsoft Office
  • Google Docs
  • Chrome
  • Safari
  • Firefox
  • Edge
  • Zendesk

HeyGen

5 integrations
  • ChatGPT
  • Zapier
  • Make
  • n8n
  • HubSpot

Company

  • Company
    Grammarly
    Superhuman
    HeyGen
    HeyGen
  • Founded
    Grammarly
    2009
    HeyGen
    2020
  • Headquarters
    Grammarly
    San Francisco, CA
    HeyGen
    Los Angeles, CA
  • Monthly users
    Grammarly
    40 million people
    HeyGen
    30M+
  • Listing
    Grammarly
    Claimed
    HeyGen
    Claimed

Frequently asked questions

Is Grammarly better than HeyGen?

It depends on your workflow. Grammarly is built for polishing emails and documents in real time across many apps, keeping tone and style consistent across a team. HeyGen is built for Avatar-presented training and explainer videos.

What are the key feature differences between Grammarly and HeyGen?

Grammarly: AI writing assistant that corrects, rewrites and tone-checks your text across every app. HeyGen: Create avatar videos from text and translate them into 175+ languages. HeyGen is rated 4.0/5 from 1 user review.

Does Grammarly or HeyGen have a free plan?

Yes, both do. Grammarly is freemium and HeyGen is freemium, and each has a free plan or trial.

Which is cheaper, Grammarly or HeyGen?

Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.