Sorted by starting price

6 Cheapest Free AI Detectors of 2026

By the Rankozo research desk · Updated November 12, 2026

Among the 9 tools in our best free ai detectors ranking, ZeroGPT has the lowest verified paid starting price at $8.99 per month. Prices below are quoted from each vendor's US pricing page.

1. 01

   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

   Starts at

   $8.99

   Score 8.4

2. 02

   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

   Starts at

   $12

   Score 7.9

3. 03

   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

   Starts at

   $12.95

   Score 8.0

4. 04

   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

   Starts at

   $12.99

   Score 8.9

5. 05

   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

   Starts at

   $13.99

   Score 8.7

6. 06

   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

   Starts at

   $20

   Score 8.4

Scores and prices come from our Best Free AI Detectors ranking, which uses one method for every tool. Questions or corrections: editorial@rankozo.com