Grammarly
AI Humanizer · grammarly.com
Grammarly is an AI humanizer independently benchmarked by HumanizerBench. It ranked #12 of 13 in the July 2026 cycle with an overall score of 53.38/100 — our composite measure of how reliably it evades AI detectors while preserving the original meaning and readability.
53.38 / 100
overall score
0.0 %
median detector bypass rate
33 /33
successful tests
Last tested
Sample size
33
Methodology
v1.2.0
Detector Bypass Rates
Percentage of samples classified as human-written by each detector.
Performance by Category
Bypass rate across writing contexts.
12-Month Trend
Overall score across the past year of testing cycles.
Session recordings
See the full methodology →Screen captures from the benchmark runs, kept for auditability. Hosted links may expire over time; the JSON in this repo is the source of truth.
Test markers
- 0:18grammarly · blog_post · listicle_blog
- 0:29grammarly · marketing_copy · product_desc
- 0:42grammarly · marketing_copy · landing_copy
- 0:56grammarly · blog_post · howto_blog
- 1:07grammarly · discussion_board · discussion_post
- 1:20grammarly · application_essay · cover_letter
- 1:31grammarly · marketing_copy · landing_copy
- 1:43grammarly · application_essay · cover_letter
- 1:53grammarly · application_essay · personal_statement
- 2:06grammarly · academic_essay · lit_review
- 2:18grammarly · academic_essay · lit_review
- 2:31grammarly · academic_essay · argumentative_essay
- 2:51grammarly · blog_post · listicle_blog
- 3:02grammarly · marketing_copy · product_desc
- 3:14grammarly · application_essay · cover_letter
- 3:24grammarly · application_essay · personal_statement
- 3:35grammarly · application_essay · personal_statement
- 3:46grammarly · news_article · news_article
- 3:57grammarly · discussion_board · discussion_post
- 4:10grammarly · academic_essay · argumentative_essay
- 4:19grammarly · marketing_copy · landing_copy
- 4:30grammarly · business_email · business_email
- 4:41grammarly · blog_post · howto_blog
- 4:51grammarly · news_article · news_article
- 5:00grammarly · business_email · business_email
- 5:15grammarly · business_email · business_email
- 5:26grammarly · blog_post · listicle_blog
- 5:43grammarly · academic_essay · argumentative_essay
- 5:58grammarly · discussion_board · discussion_post
- 6:09grammarly · academic_essay · lit_review
- 6:22grammarly · news_article · news_article
- 6:32grammarly · marketing_copy · product_desc
- 6:45grammarly · blog_post · howto_blog
Minimum monthly pricing
- Monthly
- $30.00/mo
- Free tier
- Yes
How we tested
33 prompts across 7 writing categories, scored by 5 independent AI detectors. Every score is reproducible from the public methodology.