Grammarly vs Sudowrite

Tagline

AI writing assistant for grammar, tone, and clarity

The AI writing partner built for fiction writers to draft, describe, rewrite, and finish novels in their own voice.

Category

Pricing

Rating

Platforms

API

Open source

Description

Grammarly checks grammar, rewrites sentences, and generates drafts across every app.

Sudowrite is an AI writing partner designed specifically for novelists and storytellers. Driven by Muse 1.5, its proprietary fiction-trained AI model, Sudowrite assists with drafting, pacing, visual story mapping, and character continuity. Key features like First Draft, Story Bible, and Describe help writers expand their narratives, overcome blockages, and build rich sensory descriptions while retaining their unique tone.

Key features

• Citation manager
• Outline mode
• Focus mode

• Muse 1.5 fiction-trained AI model
• Story Bible step-by-step drafting pipeline
• Write autocomplete suggestions
• Describe tool for sensory details
• Expand tool to build out scenes
• Rewrite revision tool
• Chapter Continuity and Series Folder
• Unfiltered Muse for adult and smut scenes
• Canvas visual planning board
• Chat grounded in Story Bible info

Pros

• Real-time grammar checking
• Tone detection
• Plagiarism detection
• Rewriting suggestions
• Works across nearly every app
• Chrome, Edge, Word, Docs support
• Generative AI writing (GrammarlyGO)
• Enterprise security and SSO

• Offers a free trial to let users test out features before committing to a paid plan.
• Guarantees that user writing is not used to train their AI models.
• Claims no rights or ownership over what users write or generate in the tool.
• Enables writing in almost any language, matching suggestions to the user's language.
• Allows unfiltered writing (adult/smut) without AI refusal or prompt fading.
• Keeps characters, world, and plot consistent with the built-in Story Bible.
• Users retain project access to read and edit existing work even after cancelling a paid subscription.
• Features like Describe and Expand turn flat, sparse sentences into sensory-rich narrative.

Cons

• Free tier is limited
• Sometimes over-corrects
• Style suggestions can feel generic
• Weak on creative nuance
• Chrome extension is resource-heavy
• Weak on technical jargon
• Business plan is pricey
• Only English is fully supported

• Requires a credit card registration to access the initial free trial.
• Requires an ongoing paid subscription to access any AI-based features.
• May fall back on English translation when using features other than Write in foreign languages.
• No public API or developer integration options are listed on the site.
• No active native mobile applications are currently offered (though mobile hiring is shown).

Pricing plans

• FreeEUR0/month
  • • Write without mistakes
  • • See your writing tone
  • • Generate text with AI prompts
• ProEUR12
  • • Everything in Free, plus advanced writing features
  • • Adjust your writing tone
  • • Rewrite full sentences
  • • Catch accidental plagiarism
• Enterprise—
  • • Everything in Pro, plus enterprise features
  • • Enterprise-grade privacy and security
  • • Custom roles and permissions
  • • Dedicated support

• Hobby & StudentUSD10/month
  • • Perfect for people who write for fun or for school
  • • Start Free Trial
  • • No credit card, cancel anytime
  • • Use the #1 Creative Writing AI
• ProfessionalUSD22/month
  • • Good for longer works, like a novel or screenplay
  • • Get Feedback on your work
  • • Start Free Trial
  • • No credit card, cancel anytime
• MaxUSD44/month
  • • For authors who publish multiple times a year
  • • Unused credits rollover for 12 months
  • • Start Free Trial
  • • No credit card, cancel anytime
• Enterprise—
  • • Drop us a line
• 30-Minute Personal Setup SessionUSD49/one_time
  • • Enjoy a private one-on-one session with Sudowrite staff
  • • Tailored to your needs to help you get up to speed quickly
  • • Complimentary Personal Setup Session offered on Max plan must be used within 30 days of first payment

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