AI Tools comparison · 2026
Grammarly vs Runway (2026 Comparison)
Side-by-side: pricing, features, pros, cons, and our editorial winner for ai tools.
Winner summary
Grammarly vs Runway: how they differ
We have not scored Grammarly against our rubric yet, so we are not naming an overall winner here. The dimensions below are still directly comparable.
Cheaper
Grammarly
Higher rated
Not compared
Better free tier
Tie
Grammarly
Writing assistant that works across the apps you already use
Not yet scored
$12/mo
Runway
AI video generation and editing with 4K upscaling
Not yet scored
$15/mo
Feature comparison
| Dimension | Grammarly | Runway |
|---|---|---|
| Starting price | $12/mo | $15/mo |
| Free trial | Free plan | Free plan (125 one-time credits) |
| Best for | Anyone who writes in a browser all day | Filmmakers and motion designers experimenting with generative video |
| Badge | — | — |
Grammarly key features
- Grammar, spelling and tone on the free plan
- 100 AI prompts free, 2,000 on Pro
- Full-sentence rewrites on Pro
- Plagiarism and AI-text detection on Pro
- BYOK encryption on Enterprise
Runway key features
- All AI video and image models on paid tiers
- 5 parallel generations on Standard, 20 on Max
- 4K upscaling, unlimited from Pro
- Custom voice clones from Pro
- 500 GB storage on Max
Grammarly — pros & cons
Pros
- Free tier is genuinely useful, not a teaser
- Works inside most web apps rather than as a separate editor
- Single $12 paid tier — no tier puzzle
Cons
- Plagiarism and rewrite features are Pro-only
- English-focused compared with dedicated translators
Runway — pros & cons
Pros
- Annual billing cuts Standard to $12/mo
- No watermarks on any paid tier
- Max rolls unused credits over for a month
Cons
- Free credits are one-time, not monthly
- Credit burn on video is fast — 625/mo goes quickly
When to pick which
Choose Grammarly if…
- Everyday business writing
- Student and academic drafting
- Team tone consistency
Choose Runway if…
- Generative video sequences
- Music and concept videos
- 4K upscaling of existing footage