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The August 2026 results are in: WriteHuman holds #1, Undetectable AI falls to #8 on quality penalties.Read the full analysis →
HumanizerBench

Undetectable.ai vs Walter Writes

Head-to-head from the August 2026 cycle benchmark

Last tested
Sample size
33
Methodology
v1.2.0
Winner
61.49
overall
â–¼ 6
Bypass
86.0
Meaning
72.1
Readability
55.2
60.83
overall
â–¼ 2
Bypass
68.0
Meaning
68.5
Readability
65.3

Side-by-side metrics

Detector-level breakdown

Gold cell wins each row.

Detector Undetectable.ai Walter Writes
GPTZero 86.6 69.5
Winston AI 87.5 58.8
ZeroGPT 89.8 72.0
Copyleaks 65.3 46.0
Originality.ai 66.1 56.6

Minimum monthly pricing

Undetectable.ai
$19.00/mo
Free tier
Yes
Walter Writes
$12.00/mo
Free tier
Yes