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 September 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 · 78.29	Stealth Writer #2 · 75.39	HIX Bypass #3 · 73.97
Overall
Leaderboard rank	#1	#2 ▲ 1	#3 ▲ 1
Overall score	78.29	75.39	73.97
Score componentsBypass 42%, meaning 32%, readability 16%, consistency 10%; penalties come off the total.
Bypass rate95% CI shown under each value	90.181.0–97.6	86.475.7–95.0	86.375.2–95.8
Meaning preservation	72.3	76.3	76.9
Readability	56.9	47.2	34.9
Consistency across categories	82.1	81.4	75.4
Penalties	None	−1.0	None
Detector bypass ratesShare of runs each detector classified as human-written.
GPTZero	71.8	33.9	28.1
Originality.ai	91.4	97.4	97.0
Copyleaks	86.7	81.8	84.9
Winston AI	84.1	80.3	85.5
ZeroGPT	77.8	81.1	91.4
Writing categoriesCategory score: bypass credit only for real rewrites, blended with the category's own meaning and readability.
Academic Essay6 prompts	84.1	83.7	79.3
Application Essay6 prompts	71.6	62.5	64.0
Blog Post6 prompts	83.9	80.1	76.7
Business Email3 prompts	56.7	54.3	53.6
Marketing Copy6 prompts	82.1	82.0	80.2
Discussion Board3 prompts	78.2	84.0	80.2
News Article3 prompts	78.3	66.1	77.6
Pricing & accessCheapest month-to-month paid plan, not the annual rate.
Monthly price	$18.00/mo	$20.00/mo	$14.99/mo
Free tier	Yes	Yes	Yes
Free-tier word limit	250 words	1,000 words	Not recorded
Free trial	—	—	—

Every matchup

Each cell is the row tool's overall score minus the column tool's, September 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 78.29		+2.9	+4.3	+5.4	+5.5	+6.5	+8.2	+10.7	+13.2	+16.6	+17.3	+17.9	+38.9	+41.7	13–0
#2 Stealth Writer 75.39	−2.9		+1.4	+2.5	+2.6	+3.6	+5.3	+7.8	+10.3	+13.7	+14.4	+15.0	+36.0	+38.8	12–1
#3 HIX Bypass 73.97	−4.3	−1.4		+1.0	+1.2	+2.2	+3.9	+6.4	+8.9	+12.3	+13.0	+13.6	+34.6	+37.4	11–2
#4 AI Humanize io 72.94	−5.4	−2.5	−1.0		+0.1	+1.2	+2.9	+5.4	+7.8	+11.2	+12.0	+12.6	+33.6	+36.4	10–3
#5 SupWriter 72.80	−5.5	−2.6	−1.2	−0.1		+1.0	+2.7	+5.2	+7.7	+11.1	+11.8	+12.4	+33.4	+36.2	9–4
#6 Undetectable.ai 71.75	−6.5	−3.6	−2.2	−1.2	−1.0		+1.7	+4.2	+6.7	+10.0	+10.8	+11.4	+32.4	+35.2	8–5
#7 Humanize AI Pro 70.07	−8.2	−5.3	−3.9	−2.9	−2.7	−1.7		+2.5	+5.0	+8.4	+9.1	+9.7	+30.7	+33.5	7–6
#8 Phrasly 67.58	−10.7	−7.8	−6.4	−5.4	−5.2	−4.2	−2.5		+2.5	+5.9	+6.6	+7.2	+28.2	+31.0	6–7
#9 StealthGPT 65.10	−13.2	−10.3	−8.9	−7.8	−7.7	−6.7	−5.0	−2.5		+3.4	+4.1	+4.7	+25.7	+28.5	5–8
#10 Walter Writes 61.70	−16.6	−13.7	−12.3	−11.2	−11.1	−10.0	−8.4	−5.9	−3.4		+0.7	+1.4	+22.3	+25.1	4–9
#11 Super Humanizer 60.97	−17.3	−14.4	−13.0	−12.0	−11.8	−10.8	−9.1	−6.6	−4.1	−0.7		+0.6	+21.6	+24.4	3–10
#12 Grammarly 60.35	−17.9	−15.0	−13.6	−12.6	−12.4	−11.4	−9.7	−7.2	−4.7	−1.4	−0.6		+21.0	+23.8	2–11
#13 StealthBypass 39.38	−38.9	−36.0	−34.6	−33.6	−33.4	−32.4	−30.7	−28.2	−25.7	−22.3	−21.6	−21.0		+2.8	1–12
#14 Penlify 36.57	−41.7	−38.8	−37.4	−36.4	−36.2	−35.2	−33.5	−31.0	−28.5	−25.1	−24.4	−23.8	−2.8		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 →