Lex vs Sudowrite

Tagline

The AI-powered word processor designed for modern creators to write faster, clearer, and smarter.

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

Lex is a collaborative, minimalist word processor equipped with powerful AI editing tools. Designed for modern creators, Lex offers features like real-time collaboration, document styling, knowledge bases, and direct feedback from advanced language models—enabling writers to streamline their drafts and elevate their writing flow.

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

• AI Feedback
• Live Collaboration
• Style Guides
• Knowledge Bases
• Saved Prompts
• Version Control Rewind
• Document Sharing
• Title Ideas Generation
• Keyboard Shortcuts

• 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

• It is completely free to share and collaborate on Lex documents.
• Offers privacy protections by utilizing enterprise APIs from OpenAI, Anthropic, and TogetherAI.
• Does not use user writing to train language models and provides opt-out plans if policies change.
• Allows Pro users to access advanced LLMs such as GPT 4.1 and Claude 4 Opus & Sonnet.
• Provides instant live collaboration with one-click links and no required app downloads.
• Offers style guide training to help the AI write, draft, and edit in your specific brand voice.
• Features a 'Rewind' tool to scrub through and easily restore previous versions of documents.
• Includes a monthly subscription option with a refund policy if you decide you do not use it.

• 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

• Exact pricing details for Lex Pro and Lex Teams subscriptions are not publicly listed in the provided pages.
• The heavily requested Track Changes feature is marked as 'Coming soon' and is not yet fully released.
• Access to advanced AI models and early beta features requires an upgrade to the paid Lex Pro tier.
• To get unlimited group folder capabilities, users must pay extra for a Lex Teams subscription.
• No public developer API documentation or API keys are detailed beyond a simple heading.

• 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

• 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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