Free plans only

9 Best Free Free AI Detectors of 2026

By the Rankozo research desk · Updated November 12, 2026

9 of the 9 tools in our best free ai detectors ranking offer a permanent free plan. GPTZero scores highest among them at 8.9 out of 10.

01
GPTZero
Teachers who scan a class set of essays each month
Free plan with 10,000 words per month; Premium from $12.99 per month billed annually
Full entry, No. 1 overall
Paid from
$12.99
Score 8.9
02
Copyleaks
Editors who check long articles in one pass
Free scans up to 25,000 characters; Personal from $13.99 per month billed annually
Full entry, No. 2 overall
Paid from
$13.99
Score 8.7
03
QuillBot AI Detector
Teachers who check a few essays a day
Free plan; Premium is priced in euros from our location (USD check pending)
Full entry, No. 3 overall
Paid from
Free plan
Score 8.6
04
Scribbr AI Detector
Students and teachers who want unlimited checks without signing up
Free; unlimited checks up to 1,200 words each, no paid AI detector plan listed
Full entry, No. 4 overall
Paid from
Free
Score 8.5
05
Pangram
Editors and publishers who check many short pieces
Free plan with 20 checks a day; Individual from $20 per month
Full entry, No. 5 overall
Paid from
$20
Score 8.4
06
ZeroGPT
Budget buyers who want the cheapest paid upgrade
Free plan with 15,000 characters per detection; Pro from $8.99 per month billed annually
Full entry, No. 6 overall
Paid from
$8.99
Score 8.4
07
Grammarly AI Detector
Writers who already use Grammarly and want a quick score
Free detector; Pro is priced in euros from our location (USD check pending)
Full entry, No. 7 overall
Paid from
Free plan
Score 8.2
08
Originality.ai
Publishers and agencies that need scan history and team seats
Free 10,000 words one time; Pro from $12.95 per month billed annually
Full entry, No. 8 overall
Paid from
$12.95
Score 8.0
09
Sapling AI Detector
Reviewers who want sentence-level scores in many languages
Free plan with 2,000 characters per check; Pro from $12 per month billed annually
Full entry, No. 9 overall
Paid from
$12
Score 7.9