Grammarly vs StealthWriter

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Data last refreshed October 2026

Grammarly

Superhuman Platform Inc.

Free AI Writing Assistance

Freemium

81% verification coverage

StealthWriter

AiVantage LLC

Humanize AI text to read naturally and pass AI detection.

Freemium

76% verification coverage

Trust & Reliability

Grammarly

Users:10M-50M

Customers (per vendor):Databricks, Indeed, Zoom +4

GDPR

SOC 2

HIPAA

StealthWriter

GDPR

Overall Winner: Grammarly

6.8/10 vs StealthWriter at 5.2/10

Leads in:

Performance

Compliance & Data Protection

Customization

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

Grammarly

6.8

avg score

StealthWriter

5.2

avg score

Grammarly leads overall — particularly in Customization and Integration and 2 more.

StealthWriter has an edge in Ease of Use.

Based on 6 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Overall Winner

Grammarly

6.8 / 10

Grammarly

Best For

Individuals seeking mistake-free writing

Teams and businesses aiming for consistent, on-brand communication

Students and institutions needing writing assistance and plagiarism checks

Marketing teams creating clear and convincing content

StealthWriter

Best For

Writers humanizing AI-generated content

Marketers improving AI-assisted drafts

Professionals who want AI-assisted drafts to read more clearly and naturally

Regular creators needing higher daily humanization volume

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

Grammarly is best for

🤖Automation & Agents5.5🔍Research5.5✍️Writing & Content5.3

StealthWriter is best for

No task data yet

Filter by your use case:

Limitations

Grammarly

Cons

Enterprise features like SSO and data loss prevention are only available on the highest tier
Advanced AI prompts are limited on the Free and Pro plans
Requires explicit permission to record typed or copied input for some features
Grammarly cannot access sensitive fields like passwords and payment information on a best-efforts basis

StealthWriter

Cons

Each account is intended for individual use only; sharing is strictly prohibited (Terms and Conditions)
Not designed for academic dishonesty or cheating (Terms and Conditions)
Does not guarantee content will be scored as human-written by all AI detectors (Terms and Conditions)
Free plan is limited to 10 humanizations/day and 1,000 words per input
Paid plans support up to 5,000 words per input

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Customization5

Support5

Integration5

Compliance & Data Protection5

Performance5

Planning Quality5

Dimension Comparison

Grammarly

6.8

/ 10

Clear winner

StealthWriter

5.2

/ 10

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

Grammarly

8.0

StealthWriter

10.0▲ +2.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

Grammarly

6.0▲ +4.0

StealthWriter

2.0

Support

How strong is the documentation, customer support, community, and learning resources?

Grammarly

6.0

StealthWriter

7.0▲ +1.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

Grammarly

6.0▲ +3.0

StealthWriter

3.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, counted from ten verified signals: SOC 2 Type II, GDPR compliance, HIPAA, WCAG AA/AAA, PII redaction, licensed-only training, a published sub-processor list, a downloadable DPA, not training on user data, and a documented deletion path

Grammarly

7.0▲ +3.0

StealthWriter

4.0

Performance

Calculated

Latency + throughput speed

Grammarly

8.0▲ +3.0

StealthWriter

5.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

Grammarly

—

StealthWriter

—

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

Grammarly

Task

StealthWriter

4.0

Blog Writing

2.0

4.0

Article Generation

1.0

2.0

Seo Optimization

1.0

5.0

Content Research

1.0

4.0

Headline Creation

1.0

6.0

Content Repurposing

2.0

9.0

Tone Adaptation

4.0

Multi Format Output

1.0

7.0

Collaboration Workflow

1.0

5.0

Template Library

1.0

6.0

Text Summarization

1.0

7.0

Language Translation

1.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

What are the main differences between Grammarly and StealthWriter?

Grammarly — "Free AI Writing Assistance". StealthWriter — "Humanize AI text to read naturally and pass AI detection". The Features section on this page compares them side by side.

Who is Grammarly best for compared with StealthWriter?

Grammarly is best for Individuals seeking mistake-free writing; and for Teams and businesses aiming for consistent, on-brand communication. StealthWriter is best for Writers humanizing AI-generated content; and for Marketers improving AI-assisted drafts.

How does the pricing of Grammarly compare with StealthWriter?

Grammarly is freemium, includes a free plan, paid plans start at $30/month, offers a free trial. StealthWriter is freemium, includes a free plan, paid plans start at $20/month. Always verify current pricing with the vendor.

Does Grammarly or StealthWriter have a free plan?

Grammarly has a free plan and offers a free trial. StealthWriter has a free plan. Always verify current pricing with the vendor.

Do Grammarly and StealthWriter offer an API?

Grammarly offers API access on its enterprise plans. StealthWriter does not offer an API.

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