# Grammarly vs 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

- Grammarly profile: https://finderatlas.com/tools/grammarly
- HeyGen profile: https://finderatlas.com/tools/heygen
- Comparison page: https://finderatlas.com/compare/grammarly-vs-heygen
- Last reviewed: October 2026

## 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.

### 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.

## Pricing

| | Grammarly | HeyGen |
| --- | --- | --- |
| Pricing model | Freemium | Freemium |
| Free plan or trial | Yes | Yes |
| Starting price | $0 | $0 |

## Features

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

## Platforms

| Platform | Grammarly | HeyGen |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | Yes | No |
| macOS | Yes | No |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | Yes |
| Browser Extension | No | No |
| Chrome Extension | Yes | No |
| Firefox Extension | Yes | No |
| CLI | No | Yes |

## Grammarly strengths

- 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.

## Grammarly limitations

- 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 strengths

- 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

## HeyGen limitations

- 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

## FAQ

**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.