← allmeta

Search · multi-source literature retrieval

One query across Europe PMC (PubMed + more, with abstracts), Crossref, OpenAlex and ClinicalTrials.gov. Cross-source dedup, then a one-click handoff into Screen. Free, browser-only — queries hit the public APIs directly from your machine; results stay on your device.

What to do on this page — find the studies

Search several databases at once, then send the results to Screening.

Type your question or keywords (or Load PICO from Design). Optionally Expand query for synonyms.
Pick the sources to search and run Search; use Snowball to chase citations for extra recall.
Skim the results (click a row to read its abstract); duplicates across sources are merged for you.
Click Send to Screen to hand the records to Screening.

The tool does

Fetches real records from public APIs and de-duplicates them across sources.

You must check

That the search is broad enough for your question — the tool can't know your full inclusion criteria.

Query

Plain text or boolean. The same string is sent to every source (each maps boolean its own way).

Sources

Europe PMC—

Crossref—

OpenAlex—

ClinicalTrials.gov—

Max results per source Contact email (polite pool — optional) Sent to OpenAlex/Crossref/Europe PMC for faster, friendlier rate limits. Never stored or shared elsewhere.

Results

AI query help (optional)

Enable AI query expansion

Enter a query and press Search. Click any row to expand its abstract.

Source	Year	Title / abstract	DOI / ID

Sources: Europe PMC (resultType=core, abstracts), Crossref REST, OpenAlex (abstract reconstructed from its inverted index), ClinicalTrials.gov API v2. Expand query (free) rewrites your query with synonyms, abbreviations, brand/generic drug names and British/American spellings from a built-in dictionary — deterministic, no AI, raising recall before a single API call. The Relevance ↓ sort re-ranks results by a transparent TF-IDF cosine (unigram+bigram) against your query — a reproducible "semantic-ish" ranker, not a neural embedding. Snowball ↪ citation-chases the current results through OpenAlex (their references + citing papers) to recover work that keyword search alone misses. Cross-source dedup uses DOI-exact + trigram-Jaccard title similarity (≥0.85), deterministic source-rank survivor. Results are capped at the per-source limit you choose — totals reflect that cap, not the full database hit count. Send to Screen writes the sr-records-v1 envelope that the Screen app imports. Nothing is uploaded anywhere; API calls go straight from your browser to each public endpoint.