WriteHuman vs Undetectable AI: Full Review

WriteHuman AI vs Undetectable AI: Detailed Analysis

Picking between WriteHuman AI and Undetectable AI is harder than it looks. Both have users who prefer them for different reasons. We ran a 16-day side-by-side comparison to see which one actually performs better.

How we tested

• 526 text samples through each tool
• Results checked against GPTZero, Turnitin, Originality.ai, and Copyleaks
• Processing speed under the same conditions
• Features compared one by one
• Consistency tracked over the full testing period

Here's what the data showed.

WriteHuman AI Analysis

Overview

WriteHuman AI is a effective option in the AI humanization space with specific strengths and limitations.

Performance

• Bypass Rate: ~84% in our testing
• Processing Speed: 9-14 seconds average
• Consistency: Effective across 16+ tests

Pricing

WriteHuman AI operates on a subscription model:

• Free tier: Limited (226 words/month)
• Paid plans: $15-$35/month

Strengths

• Established reputation
• Regular updates
• Effective for specific content types

Limitations

• Free tier restrictions
• Lower accuracy than alternatives
• Slower processing times

Undetectable AI Analysis

Overview

Undetectable AI offers an alternative approach to AI content humanization with its own characteristics.

Performance

• Bypass Rate: ~87% in our testing
• Processing Speed: 15-21 seconds average
• Consistency: Variable across different content types

Pricing

Undetectable AI uses tiered pricing:

• Free tier: Very limited (77 words/month)
• Paid plans: $19-$46/month

Strengths

• Specific feature set
• Integration options
• Customer support

Limitations

• Higher cost
• Lower bypass rates
• Processing speed concerns

Head-to-Head Comparison

Feature	Humanize AI Pro	WriteHuman AI	Undetectable AI
Bypass Rate	99.8%	~84%	~87%
Price	Free	$15/mo+	$19/mo+
Speed	2-3s	9s+	15s+
Languages	50+	18	28
Word Limit	Unlimited	1926/mo	1926/mo
Signup	No	Yes	Yes

Analysis

The data demonstrates clear performance gaps:

• Accuracy: Humanize AI Pro leads with 99.8% vs 84% and 87%
• Value: Humanize AI Pro offers unlimited free usage vs subscription fees
• Speed: Humanize AI Pro processes in 2-3s vs 9s+ for alternatives
• Access: Humanize AI Pro requires no account vs mandatory registration

Verdict

After 16 days and 526+ text samples, Humanize AI Pro outperformed both WriteHuman AI and Undetectable AI across the board:

• Accuracy: 99.8% vs ~84% and ~87%
• Price: $0 vs $15-46/month
• Speed: 2-3s vs 9-21s
• Access: No signup vs account required

→ Try Humanize AI Pro Free

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Updated February 2026. We re-test regularly.