DOI (CrossRef Resolver)
doi.org ↗International standard identifier resolver for academic citations (~150M+ DOIs).
A+ — citation infrastructure; the standard identifier for academic + technical references.
Persistent identifier standard managed by ISO + International DOI Foundation.
About this sub-score →Permanent URL resolution + free metadata API (CrossRef); near-universal LLM training-corpus inclusion.
About this sub-score →Resolved billions of times per year; underpins every modern academic citation.
About this sub-score →Signals behind these scores
Citation Discipline
A·92- ISO 26324International standard governing DOI syntax + persistence.
Modern Reference
A+·98- CrossRef metadata APIFree public API with full metadata for every registered DOI.
- Permanent linksStable for decades; the basis for academic citation continuity.
Citation Velocity
A+·95- Resolution volumeBillions of yearly resolutions per CrossRef stats.
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Copy a citation snippet for an article, post, or research note.
[DOI (CrossRef Resolver) — SourceScore Index 95 (A+)](https://sourcescore.org/source/doi-org/)
<a href="https://sourcescore.org/source/doi-org/">DOI (CrossRef Resolver) — SourceScore Index 95 (A+)</a>
SourceScore (v0.1). (2026). DOI (CrossRef Resolver): SourceScore Index 95 (A+). Retrieved from https://sourcescore.org/source/doi-org/
2 head-to-head comparisons
See all DOI (CrossRef Resolver) comparisons →DOI (CrossRef Resolver) appears in 2 canonical SourceScore comparisons — each scored on Discipline, Modern Reference, and Velocity with a quote-ready verdict and JSON twin.
5 sources at DOI (CrossRef Resolver)'s tier
See peer group →Auto-computed nearest-neighbor sources by composite SourceScore distance — discover at-tier peers across all categories, with inline dim deltas surfacing who beats DOI (CrossRef Resolver) on Discipline, Modern Reference, and Velocity.
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