Metadata completeness — one score
Any journal by its ISSN, any DOI prefix, any Crossref member: how much of the metadata indexes read is on the record, what is missing, and who fixes it. Free, no account — every figure is Crossref's own.
MDPI AG
Crossref member 1968 · Crossref member record ↗ · Crossref participation reports ↗ · What Crossref holds about you ↗
Read from Crossref — 23 Oct 2026, 02:08. Counted over the member's journal articles, as Crossref counted them on 22 Oct 2026.
This is the record as it was kept on 23 Oct 2026 — a page of its own you can send as proof. Today's figures →
The seven signals indexes read
Of the 2,053,004 journal articles, how many carry each one. The impact numbers sum to 100 and make the score — the weighted share of what is there; a signal Crossref gave no figure for is left out of the score, never counted as 0.
| Signal | Share | Without it | What it means — and who fixes it |
|---|---|---|---|
| Reference lists impact 22 |
98.1% | 39,882 | The engine deposits the reference list of each article — this is what feeds Cited-by, OpenAlex and Scholar. Run the Reference Booster / DOI Doctor. The engine deposits it. |
| Abstracts impact 18 |
98.9% | 22,625 | No abstract in the record means weaker discovery everywhere. DOI Doctor reads it from the PDF and deposits it. The engine deposits it. |
| Licences impact 16 |
98.8% | 24,186 | A licence in the record is what marks the article open access and DOAJ counts it. DOI Doctor deposits the licence your article page states. The engine deposits it. |
| ORCID iDs impact 14 |
83.3% | 343,598 | Author ORCIDs tie the work to its authors for ORCID, funders and OpenAlex. The engine deposits them when the article page carries them; otherwise add them in OJS first. Needs the value on the page first. |
| Author affiliations impact 12 |
98.5% | 31,601 | A machine-readable affiliation is what gives the institution credit and lets NIRF / NAAC counts find the work. Add affiliations to the article metadata; the engine deposits them. Needs the value on the page first. |
| ROR institution ids impact 10 |
<0.1% | 2,052,996 | A ROR id (ror.org) is the machine-readable name of the institution — the strongest institutional-credit signal there is. Add each institution's ROR to the affiliation; the engine deposits it with the affiliation. Needs the value on the page first. |
| Funder data impact 8 |
60.0% | 822,148 | Funder ids link the work to the grant that paid for it — read by funders and OpenAlex. Add the funder to the article metadata; the engine deposits it. Needs the value on the page first. |
Beside the score
The other elements of Crossref's participation report. They are shown here, and they are not part of the score.
| Element | Share | Without it | What it is for |
|---|---|---|---|
| Award numbers | 55.2% | 920,731 | The grant number beside the funder — what lets a funder find the work its grant paid for. |
| Crossmark update policy | 98.4% | 33,470 | Crossmark tells a reader, on the article itself, whether it has since been corrected or retracted. |
| Similarity Check URLs | 99.8% | 3,338 | A full-text link that Crossref's Similarity Check service reads, so new manuscripts can be compared against this article. |
| Text-mining URLs | 0.5% | 2,042,447 | A full-text link for text and data mining — how Crossref and mining services reach the article itself. |
Fix these
In the order that moves the score most — impact × how much is missing. Each is a metadata deposit at Crossref, not a re-write of any article.
- ROR institution ids — 2,052,996 without it (<0.1% carry it) · needs the value on the page first
- Funder data — 822,148 without it (60.0% carry it) · needs the value on the page first
- ORCID iDs — 343,598 without it (83.3% carry it) · needs the value on the page first
- Reference lists — 39,882 without it (98.1% carry it) · the engine deposits it
- Abstracts — 22,625 without it (98.9% carry it) · the engine deposits it
- Licences — 24,186 without it (98.8% carry it) · the engine deposits it
- Author affiliations — 31,601 without it (98.5% carry it) · needs the value on the page first
DOI repair & monitoring (DOI Members): the journal is added to your portfolio, then the order for one journal, twelve months — the repairs are deposited under the journal's own Crossref login, each one read back before it counts. DOI Doctor is where a journal's owner runs the same repairs.
Every DOI, yes or no — the gap list
One row for every journal article Crossref lists for member 1968, and for each element whether that record carries it.
⬇ Gap list — every DOI, yes/no per element (CSV)The same file as "What Crossref holds about you" makes: up to 5,000 records (5 requests of 1,000, Crossref's maximum per request); a member with more gets the first 5,000 as Crossref lists them, and the file says so. A finished list is kept for 6 hours; a fresh read counts as one lookup (12 an hour from one place; 60 for a signed-in account).
Before and after
First recorded 9 Oct 2026: 83 (B) → latest 23 Oct 2026: 83 (B)
| Signal | First | Latest | Change |
|---|---|---|---|
| Reference lists | 98.1% | 98.1% | no change |
| Abstracts | 98.9% | 98.9% | no change |
| Licences | 98.8% | 98.8% | no change |
| ORCID iDs | 83.2% | 83.3% | no change |
| Author affiliations | 98.5% | 98.5% | no change |
| ROR institution ids | <0.1% | <0.1% | no change |
| Funder data | 59.9% | 60.0% | no change |
Every record kept — one a day, the day's last reading — each a page of its own you can send as proof: 23 Oct 2026 — 83 (B) · 20 Oct 2026 — 83 (B) · 16 Oct 2026 — 83 (B) · 9 Oct 2026 — 83 (B)
What large publishers reach, read on 16 Oct 2026
Each scored exactly as any member is scored here — from its own Crossref member record, by the same seven signals and weights. Names are Crossref's own. The median of the 12 is 41.
MDPI AG: 83 — 42 points above the large publishers' median, and 51 points above all of Crossref.
How the score is made
- Reference lists — impact 22
- Abstracts — impact 18
- Licences — impact 16
- ORCID iDs — impact 14
- Author affiliations — impact 12
- ROR institution ids — impact 10
- Funder data — impact 8
The score is the share of each signal on the record, weighted by its impact (the impacts sum to 100). A signal Crossref gives no figure for is left out and the rest are weighed as before — never counted as 0. Grade A from 85, B from 70, C from 55, D from 40, otherwise E. A journal is read off Crossref's journal record (its current and backfile DOIs, weighted by how many each holds); a prefix and all of Crossref by counting every DOI with Crossref's own has-… filters; a member off its member record, as What Crossref holds about you reads it. The members door's engagement dashboard prints the same score from the same functions.
Sources: Crossref REST API · Crossref participation reports · ROR · ORCID · doi.org. This page reads only what is public; it says what a database sees when it looks the record up — not whether a journal is well run.
