AI Tool Comparison
Comparing as AI Grammar & Proofreading ToolsGrammarly vs StealthWriter
Grammarly
VS
StealthWriter
Verdict by Category
Detailed Comparison
Feature
Grammarly
StealthWriter
Pricing
FreemiumGrammarly's Free plan is available at no cost and includes mistake-free writing, tone detection, and 100 AI text generation prompts per month — suitable for individuals with basic needs.
The Pro plan costs $12/member/month billed annually ($30/month when billed monthly) and adds full-sentence rewrites, tone adjustments, brand voice customization, style guide adherence, and 2,000 AI prompts per month.
Enterprise plans are available through Superhuman Go with unlimited members, proactive AI across all apps and tabs, confidential mode, data loss prevention, granular roles and permissions, and dedicated support. Organizations report saving an average of $5,000 per employee per year.
FreemiumStealthWriter offers a free tier with limited daily word credits using the Ninja engine. Paid plans starting at approximately $20/month unlock Ghost mode for heavy-duty academic detector bypass, higher monthly word limits, and batch processing. Annual plans are available at reduced monthly rates. Contact StealthWriter through stealthwriter.ai for business and high-volume pricing.
Categories
AI Writing Assistant ToolsAI Productivity ToolsAI Copywriting Tools
AI Writing Assistant ToolsAI Productivity Tools
Summary
AI writing assistant for real-time grammar, clarity, tone, and style — works everywhere you write
Dual-engine AI humanizer with Ninja and Ghost modes — bypasses Turnitin and GPTZero
Grammarly Pros & Cons
Pros
- Works across every app and browser — not just a standalone editor
- Trusted by 40M+ users and 50K+ organizations worldwide
- Tone and clarity suggestions go well beyond basic spell-check
- Free plan is genuinely useful with no credit card required
- Enterprise features include DLP, SSO, and brand style guides
- Integrates natively with Google Docs, Outlook, and Slack
Cons
- Pro plan can be expensive at $30/month when billed monthly
- AI generation prompts are limited even on Pro (2,000/month)
- Suggestions can sometimes feel overly prescriptive for creative writing
- Desktop app required for full cross-app functionality
- No long-form AI document drafting like dedicated writing tools
StealthWriter Pros & Cons
Pros
- Dual-engine architecture — Ninja for speed, Ghost for the toughest academic detectors
- Interactive synonym selection gives users fine-grained control over final output voice
- Built-in AI detector shows before/after bypass scores for confidence before submitting
- Free tier available — no credit card required to test Ninja engine
- SEO-safe output preserves keyword placement and semantic structure
Cons
- Ghost mode processing takes 15-20 seconds per request
- Higher pricing than some single-engine competitors
- Free tier has limited word count
- Occasional generic phrasing on very technical content
- No API access on lower plans