Grammarly
AI Humanizer · grammarly.com
Grammarly is an AI humanizer independently benchmarked by HumanizerBench. It ranked #11 of 12 in the August 2026 cycle with an overall score of 52.91/100 — our composite measure of how reliably it evades AI detectors while preserving the original meaning and readability.
52.91 / 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
- 0:11grammarly · business_email · business_email
- 0:27grammarly · news_article · news_article
- 0:46grammarly · application_essay · cover_letter
- 2:43grammarly · blog_post · howto_blog
- 3:17grammarly · marketing_copy · landing_copy
- 3:32grammarly · academic_essay · lit_review
- 3:55grammarly · blog_post · listicle_blog
- 4:12grammarly · marketing_copy · landing_copy
- 4:26grammarly · blog_post · listicle_blog
- 4:44grammarly · news_article · news_article
- 4:59grammarly · blog_post · listicle_blog
- 5:14grammarly · academic_essay · argumentative_essay
- 6:00grammarly · discussion_board · discussion_post
- 6:28grammarly · academic_essay · argumentative_essay
- 6:45grammarly · application_essay · cover_letter
- 6:58grammarly · marketing_copy · product_desc
- 7:11grammarly · academic_essay · lit_review
- 7:23grammarly · blog_post · howto_blog
- 7:37grammarly · academic_essay · lit_review
- 7:50grammarly · application_essay · cover_letter
- 8:01grammarly · news_article · news_article
- 8:12grammarly · discussion_board · discussion_post
- 8:24grammarly · discussion_board · discussion_post
- 8:35grammarly · blog_post · howto_blog
- 8:48grammarly · business_email · business_email
- 9:01grammarly · application_essay · personal_statement
- 9:19grammarly · marketing_copy · product_desc
- 9:30grammarly · marketing_copy · product_desc
- 9:40grammarly · application_essay · personal_statement
- 9:55grammarly · business_email · business_email
- 10:08grammarly · application_essay · personal_statement
- 10:21grammarly · academic_essay · argumentative_essay
- 10:36grammarly · marketing_copy · landing_copy
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.