AI detector pricing in 2026 has three bands: free tiers for individual quick checks, individual paid plans for regular use, and institutional or enterprise plans for schools, publishers and content teams. Within each band pricing is structured differently (per-word credits, per-seat subscriptions, or site licences), and the right comparison depends on how the detector is being used.
Pricing comparison
Pricing captured from vendor pricing pages in October 2026. Verify current pricing before purchase; vendor pricing changes.
Capture-date pricing is a snapshot. For a procurement decision, request the current pricing in writing from the vendor along with the DPA terms.
Three cost-comparison patterns
For individuals: cost per month. The useful comparison for personal use is the monthly fee at the use volume you expect. Most individual plans run USD 10 to 20 per month for mainstream detectors. The free tiers cover occasional use at zero cost.
For agencies and content teams: cost per 1,000 words checked. For teams running high volume, the per-word or per-scan credit model matters more than the monthly fee. Originality.AI publishes per-scan pricing; Copyleaks and GPTZero publish per-page or per-scan equivalents on request.
For institutions: cost per seat and total deal size. For universities, publishers and enterprises, the per-seat or per-site licence is negotiated. The total deal size and renewal uplift matter more than any single list price. The procurement checklist covers the questions to ask on pricing.
What free covers, what paid adds
Free tiers cover the use case for personal and occasional checks. Paid tiers add four things:
- Higher usage caps. Longer scans, more scans per month, no daily cap.
- API access. For integration into editorial, moderation or classroom workflows.
- Reports. Per-paragraph breakdown, chain-of-custody logging, exportable PDF.
- Institutional features. SSO, LMS integration, admin console, vendor DPA.
For a comparison of free detector tiers specifically, see the best free AI detector guide.
Overage traps
Three pricing traps that catch buyers at renewal:
Overage charge above cap. A low per-seat price with a word cap and a high overage charge is cheap at light use and expensive at heavy use. Ask the vendor for the overage charge upfront.
Renewal uplift. Multi-year contracts can bake in a 5 to 15 percent annual uplift. Cap the uplift at contract signing.
Modules not included in the entry plan. AI detection may be an add-on module separate from the base plagiarism-checking plan. The headline price often does not include every module a buyer needs.
Alternatives
For a free detector with no card, Walter free detector is the lowest-friction option. For the full free comparison see the best free AI detector guide. For procurement across detectors see the procurement checklist.
Frequently asked questions
How much do AI detectors cost in 2026?
Free tiers at zero cost, individual paid plans USD 9 to 20 per month, institutional and enterprise plans run from hundreds to thousands of dollars per month.
What is the cheapest AI detector?
The free tiers of mainstream detectors are the cheapest working options. Walter free detector has no card requirement.
Which AI detector is free?
Walter free detector, GPTZero free tier, QuillBot (with account), ZeroGPT (with word caps). None is unlimited.
Is Turnitin AI detection free?
No. Turnitin is institutionally licensed. For a free equivalent check, Walter or GPTZero free tiers cover individual pre-checks.
How is AI detector pricing structured?
Per-word credits (Originality.AI), per-seat subscriptions (GPTZero, Turnitin), or site licences (Turnitin, Pangram enterprise). Free tiers cap by words, scans or features.
What this means for you
For personal use, start with a free detector tier and upgrade only when you hit the cap. For agency and team use, compare on cost per 1,000 words checked rather than headline per-seat price. For institutional procurement, the total deal size, renewal uplift and DPA terms matter more than any single list price.
Sources
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