Compare AI humanizers

Pick two to four tools and read them side by side, or open any pair's full head-to-head page. Every number comes from the same October 2026 benchmark run: the same prompts, the same detectors, the same scoring, all of it published.

Pick 2 to 4 tools 3 of 4 selected

Pick exactly two for a full head-to-head page with charts, history and a written verdict.

Metric	WriteHuman #1 · 74.89	StealthGPT #2 · 74.50	Undetectable.ai #3 · 71.18
Overall
Leaderboard rank	#1	#2 ▲ 7	#3 ▲ 3
Overall score	74.89	74.50	71.18
Score componentsBypass 42%, meaning 32%, readability 16%, consistency 10%; penalties come off the total.
Bypass rate95% CI shown under each value	88.885.0–92.3	88.184.2–92.0	74.670.9–78.3
Meaning preservation	60.0	61.8	79.2
Readability	55.9	72.6	63.9
Consistency across categories	94.7	90.9	93.0
Penalties	None	−3.0	−5.0
Detector bypass ratesShare of runs each detector classified as human-written.
GPTZero	99.5	94.8	85.0
Originality.ai	100.0	96.3	88.7
Copyleaks	93.3	100.0	87.9
Winston AI	100.0	90.4	98.5
ZeroGPT	89.5	77.3	83.8
Pangram	50.3	69.9	3.5
Writing categoriesCategory score: bypass credit only for real rewrites, blended with the category's own meaning and readability.
Academic Essay6 prompts	70.7	73.6	69.0
Application Essay6 prompts	73.6	73.4	76.4
Blog Post6 prompts	72.4	70.4	58.1
Marketing Copy6 prompts	71.8	69.7	71.5
Discussion Board3 prompts	71.9	57.2	69.4
News Article3 prompts	77.9	84.0	61.4
Pricing & accessCheapest month-to-month paid plan, not the annual rate.
Monthly price	$18.00/mo	$25.50/mo	$19.00/mo
Free tier	Yes	No	Yes
Free-tier word limit	250 words	—	Not recorded
Free trial	—	—	Yes

Every matchup

Each cell is the row tool's overall score minus the column tool's, October 2026 cycle. Green means the row leads, red the column. Click a cell to open that head-to-head; the last column is each tool's win–loss record against the rest of the field.

91 pairs · 14 tools

Row minus column	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	#11	#12	#13	#14	W–L
#1 WriteHuman 74.89		+0.4	+3.7	+5.9	+6.0	+6.7	+7.3	+8.9	+9.8	+11.4	+12.1	+13.1	+13.1	+13.6	13–0
#2 StealthGPT 74.50	−0.4		+3.3	+5.5	+5.6	+6.3	+6.9	+8.5	+9.4	+11.0	+11.8	+12.7	+12.8	+13.2	12–1
#3 Undetectable.ai 71.18	−3.7	−3.3		+2.2	+2.3	+2.9	+3.6	+5.2	+6.0	+7.7	+8.4	+9.4	+9.4	+9.9	11–2
#4 Clever AI Humanizer 69.02	−5.9	−5.5	−2.2		+0.1	+0.8	+1.4	+3.0	+3.9	+5.5	+6.3	+7.2	+7.3	+7.7	10–3
#5 Humanize AI Pro 68.87	−6.0	−5.6	−2.3	−0.1		+0.6	+1.3	+2.9	+3.7	+5.3	+6.1	+7.1	+7.1	+7.6	9–4
#6 AI Humanize io 68.24	−6.7	−6.3	−2.9	−0.8	−0.6		+0.7	+2.3	+3.1	+4.7	+5.5	+6.4	+6.5	+6.9	8–5
#7 Super Humanizer 67.58	−7.3	−6.9	−3.6	−1.4	−1.3	−0.7		+1.6	+2.4	+4.0	+4.8	+5.8	+5.8	+6.3	7–6
#8 Stealth Writer 65.98	−8.9	−8.5	−5.2	−3.0	−2.9	−2.3	−1.6		+0.8	+2.5	+3.2	+4.2	+4.2	+4.7	6–7
#9 HIX Bypass 65.14	−9.8	−9.4	−6.0	−3.9	−3.7	−3.1	−2.4	−0.8		+1.6	+2.4	+3.4	+3.4	+3.9	5–8
#10 Walter Writes 63.53	−11.4	−11.0	−7.7	−5.5	−5.3	−4.7	−4.0	−2.5	−1.6		+0.8	+1.7	+1.8	+2.2	4–9
#11 SupWriter 62.75	−12.1	−11.8	−8.4	−6.3	−6.1	−5.5	−4.8	−3.2	−2.4	−0.8		+1.0	+1.0	+1.5	3–10
#12 Phrasly 61.79	−13.1	−12.7	−9.4	−7.2	−7.1	−6.4	−5.8	−4.2	−3.4	−1.7	−1.0		0.0	+0.5	1–11–1
#13 Humbot 61.74	−13.1	−12.8	−9.4	−7.3	−7.1	−6.5	−5.8	−4.2	−3.4	−1.8	−1.0	0.0		+0.5	1–11–1
#14 Grammarly 61.29	−13.6	−13.2	−9.9	−7.7	−7.6	−6.9	−6.3	−4.7	−3.9	−2.2	−1.5	−0.5	−0.5		0–13

Closest calls

Smallest overall gaps this cycle. Read the confidence intervals before picking a side.

The podium

The top three against each other.

Widest gaps

The most lopsided pairs in the field.

Rankings are recomputed every cycle from published inputs, outputs and detector verdicts. How scoring works →