Data Search Engines & Statistics Portals
Find the right search engine for every research task
Data search engines locate datasets and verified statistics for analysis and charts. They help researchers, analysts and reporters back up numeric claims. Our World in Data offers curated indicators, Google Dataset Search spans repositories and the World Bank covers development data.
- 9 specialized resourcesAcademic, government, legal, archive and data sources
- 16 research categoriesOrganized by research task, not by brand
- 9 editorially reviewedDocumented desk reviews; others show “Not Yet Rated”
- Research guidesLearn how to search each source effectively
Data & Statistics search engines & databases
data.europa.eu
Data & StatisticsThe EU’s open-data discovery and reuse portal, succeeding the EU Open Data Portal and European Data Portal. It aggregates dataset metadata; the data and reuse ...
Best for: Discovering public datasets from EU, national, regional, local, and international portals
Eurostat
Data & StatisticsThe European Union’s statistical office provides a public data browser and REST APIs for statistical data and metadata in formats including SDMX, JSON-stat, and TSV.
Best for: Official European and EU-member-state statistics, structured dataset queries, and metadata discovery.
FRED (Federal Reserve Economic Data)
Data & StatisticsA large economic-data platform with charting, maps, downloadable series, and a documented API. Account features are optional and free according to official materials, but data ...
Best for: Finding, charting, and downloading U.S. and international economic and financial time series
Google Dataset Search
Data & StatisticsSearch engine from Google for finding datasets published across the web.
Best for: Finding datasets on any topic
OECD Data Explorer
Data & StatisticsThe OECD’s statistical data warehouse and discovery interface for official datasets, offering filters, downloads, and programmatic API access.
Best for: OECD and partner-economy official statistics, dataset exploration, downloads, and SDMX API retrieval.
Our World in Data
Data & StatisticsFree online publication of research and data on global issues, based at the University of Oxford.
Best for: Charts and data on global trends
UNdata
Data & StatisticsA unified portal of statistical datamarts with searchable tables, downloads, country profiles, and REST/SOAP SDMX API access.
Best for: Cross-topic discovery and download of international statistics compiled by UN and other international and national sources.
Wikidata Query Service
Data & StatisticsA public SPARQL endpoint and web GUI for querying Wikidata’s linked knowledge graph and returning structured results.
Best for: Ad hoc structured research and relationship discovery across Wikidata using SPARQL and a visual query interface.
World Bank Open Data
Data & StatisticsFree access to global development data from the World Bank.
Best for: Country-level development indicators
No resources match these filters.
What is a specialized search engine?
A specialized search engine focuses on one type of content or one subject — scholarly literature, clinical studies, legislation, company filings, archived web pages or official statistics. Its index, metadata and filters are designed for that content, so it often finds sources that general web search engines rank poorly or cannot reach because they sit inside databases.
Example: searching “metformin cardiovascular outcomes” in a general web search engine mixes news and health sites; the same query in PubMed returns indexed clinical literature you can filter by study type and date.
General vs specialized search engines
| Feature | General search engines | Specialized search engines |
|---|---|---|
| Content scope | The open web | One subject or content type |
| Source quality | Mixed; ranked by popularity signals | Curated or authoritative collections |
| Filters | Date, language, file type | Field-specific: study type, court, filing form, dataset |
| Best use | Orientation and general information | Professional, academic and investigative research |
| Examples | Google, Bing | Google Scholar, PubMed, SEC EDGAR, Wayback Machine |
Using AI search for research
AI answer engines can help you frame a question and discover terminology, but they summarize sources and can misstate them. Use them to orient, then confirm facts in a specialized database and cite the original source, not the AI answer.
Browse AI research tools →How AOFIRS reviews resources
Listings are checked against official documentation. Ratings are documented desk reviews scored on seven weighted criteria: usefulness 25%, reliability 20%, features 15%, ease of use 15%, transparency 10%, privacy 10%, value 5%. Defunct, parked and consumer-only sites are removed. Resources without a completed review show “Not Yet Rated”.
Read our editorial policy →Suggest a search engine or report an error
Know a specialized resource we should include, or spotted an outdated detail? Send the resource name, its official website and what should change. AOFIRS does not sell listings or rankings.
Submit a suggestion →How to choose the right search engine
Start from the research task: the type of source you need, who publishes it, and whether you need full text, metadata or raw data. Our guides walk through each research type step by step.
Read the guides →Frequently asked questions
What is a specialized search engine?
A specialized search engine indexes one type of content or one field — for example scholarly papers, court records, company filings, archived web pages or statistical datasets. Because its index and filters are built for that content, it usually returns more relevant, better-sourced results than a general web search engine for professional research tasks.
How is a search engine different from a research database?
A search engine crawls and indexes content from many sources. A research database holds a curated collection, often maintained by a single publisher or agency (PubMed, SEC EDGAR, ERIC). Many resources in this library are search interfaces to databases; each listing states its operator so you know where the data comes from.
Are AI answer engines the same as search engines?
No. AI answer engines such as Perplexity or ChatGPT search generate written answers from retrieved sources. They are useful for orientation, but you should open and check the cited sources. AOFIRS lists AI answer engines separately in the AI Tools section and does not classify every AI product as a search engine.
How does AOFIRS rate search engines?
Ratings are documented desk reviews based on each provider’s official documentation, scored on seven weighted criteria: usefulness 25%, reliability 20%, features 15%, ease of use 15%, transparency 10%, privacy 10% and value 5%. A resource shows “Not Yet Rated” until a review is completed.
Does AOFIRS accept payment for listings?
No. Listings and ratings are editorial. AOFIRS does not sell placement, and resources are not ranked by sponsorship.
How can I report an error or suggest a search engine?
Use the AOFIRS contact page. Include the resource name, its official website and what should change. Corrections are checked against the provider’s own documentation before the listing is updated.
