# Grammarly vs Runway

> Grammarly: AI writing assistant that corrects, rewrites and tone-checks your text across every app
> Runway: AI video, image and audio creation suite with Gen-4.5, agents and an API

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

## Verdict

Grammarly is listed under AI Assistants and Runway under Image & Visual AI. Both have a free plan or trial. Only Grammarly is available on Windows, macOS and Chrome Extension.

### 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 Runway if

- You want a tool built for Text-to-video and image-to-video generation.
- Combines video, image and audio generation and editing in one workspace.
- Offers Runway's own Gen-4.5 plus third-party models such as Seedance 2.0.

## Pricing

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

## Features

| Feature | Grammarly | Runway |
| --- | --- | --- |
| 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 |
| Gen-4.5 video model | Not listed | Yes |
| Creative Agent | Not listed | Yes |
| Multiple models | Not listed | Yes |
| Characters | Not listed | Yes |
| Aleph and Act-Two | Not listed | Yes |
| Audio tools | Not listed | Yes |
| Workflows and Recipes | Not listed | Yes |
| Runway Dev API | Not listed | Yes |
| Runway MCP | Not listed | Yes |

## Platforms

| Platform | Grammarly | Runway |
| --- | --- | --- |
| 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 |

## 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.

## Runway strengths

- Combines video, image and audio generation and editing in one workspace
- Offers Runway's own Gen-4.5 plus third-party models such as Seedance 2.0
- Creative Agent builds videos from a conversation
- Runway Dev API with Node and Python SDKs
- Free plan with 125 credits that do not expire
- Native iOS and Android apps

## Runway limitations

- Credit-based pricing: a 5-second Gen-4.5 clip costs 60 credits, so the 625 credits on Standard cover about 10 such clips
- Standard and Pro credits do not roll over at the end of the month
- Some App Store reviewers complain about the cost of failed or unusable generations
- 4K upscaling is unlimited only on Pro and Max

## FAQ

**Is Grammarly better than Runway?**

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. Runway is built for Text-to-video and image-to-video generation.

**What are the key feature differences between Grammarly and Runway?**

Grammarly: AI writing assistant that corrects, rewrites and tone-checks your text across every app. Runway: AI video, image and audio creation suite with Gen-4.5, agents and an API.

**Does Grammarly or Runway have a free plan?**

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

**Which is cheaper, Grammarly or Runway?**

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