Writing · Head-to-head

Grammarly vs Sudowrite

Grammarly (freemium, AI Score 7.8/10) vs Sudowrite (paid, AI Score 7.8/10). Side-by-side pricing, features, pros and cons, and which to pick.

The verdict

Pick Grammarly if…

→budget is the constraint
→your primary use case is students writing to a rubric, and comms or support teams at companies with a house style guide, who need writing help inside email, docs and internal tools rather than in a separate chat window.
→you need: productivity, education

Try Grammarly →

Pick Sudowrite if…

→your primary use case is novelists and screenwriters drafting a book-length manuscript who want story canon, outline and beats to persist across months of work instead of re-priming a chat thread every session.

Try Sudowrite →

Spec	Grammarly	Sudowrite
Category	Writing	Writing
Pricing model	freemium	paid
Headline pricing	Free tier + Pro around $12/mo billed annually — check website for current pricing	From $19/mo, no free tier
Free tier	Yes — unlimited grammar, spelling and punctuation checks plus basic tone feedback, with generative AI prompts capped monthly	No ongoing free tier — a limited starter-credit trial only. Verify current credit allowances and prices on sudowrite.com/pricing before relying on them.
AI Score	7.8/10	7.8/10
Best for	Students writing to a rubric, and comms or support teams at companies with a house style guide, who need writing help inside email, docs and internal tools rather than in a separate chat window.	Novelists and screenwriters drafting a book-length manuscript who want story canon, outline and beats to persist across months of work instead of re-priming a chat thread every session.
Editor's pick	—	—
Use cases	content-creation productivity education	content-creation
Date added	2025-05-01	2025-09-01

Writing · freemium

✓Operates inside the apps and sites you already write in, so there is no copy-paste round trip to a chat window
✓Ships academic tooling general assistants skip: rubric-based grading, citation finding, plagiarism and AI-text detection
✓Enterprise style guides and brand tones enforce a defined house voice across an entire organization
✓The free tier is genuinely usable for grammar, spelling and basic tone rather than a crippled trial
✓Business tiers carry SOC 2 Type II compliance and commitments against training on customer data

×Generative quality trails frontier chatbots for anything longer than a paragraph or two
×The Superhuman rebrand splintered the lineup across Grammarly, Docs, Mail and Go, making it unclear what a given subscription actually covers
×Hard to justify a separate subscription when an existing ChatGPT or Claude plan already handles rewriting
×The always-on desktop and browser agent reads text across every app, which is a real privacy and resource consideration

Writing · paid

✓Story Bible works as persistent canon — characters, outline and worldbuilding feed every generation, so continuity holds across a full manuscript instead of decaying over a long chat
✓Muse, the in-house prose model, sidesteps the tidy assistant register that general chatbots slip into when writing fiction
✓Story Engine drafts chapter by chapter from beats you wrote, so the plot stays yours rather than being invented by the model
✓Plugin system lets writers build and share custom tools, which no general-purpose chatbot offers for fiction workflows
✓The small tools — Describe, Brainstorm, Expand, Rewrite, Twist — map to the specific places fiction writers actually get stuck

×No free tier, only a limited trial, and entry-plan credits go fast on anything novel-length
×Credit pricing is hard to forecast — the same chapter costs a different amount depending on which feature and model you route it through
×A frontier chatbot with a long context window now produces comparable prose for less money, which narrows the case for a dedicated subscription to writers who want the workflow
×Text-only: no voice, image, video or agentic capabilities, so it does none of the surrounding work a general assistant will do

Updated 2026-08-10. Spec data sourced from official product pages and tracked in our public directory at /tools.