Crossref Similarity Check pricing

2 plans on the record

Every plan

Similarity Check per-document checking

Free

Invoiced annually in January for the previous year’s usage.

First 100 documents per year free · up to 25,000 words per document · subsequent rates are $0.75, $0.65, $0.55, $0.45, $0.30, or $0.25 per document by annual volume tier

Read 9 Oct 2026 · crossref.org

Similarity Check annual service fee

$40 a year

Included in the annual membership fee invoice; prorated for the remainder of the calendar year when first joining.

20% of annual Crossref membership fee · fee depends on membership tier

Read 9 Oct 2026 · crossref.org