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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse O*NET by default for a career app focused on the United States; use ESCO for an app serving European markets that needs multilingual occupation and skills concepts. The right choice depends on the countries, languages, and occupational data your product needs—not on a universal ranking. A global app can use both, but should preserve each source’s identifiers and validate any crosswalk rather than assume a one-to-one match.
What each database is designed to provide
O*NET: occupational detail and U.S. career services
O*NET is a U.S. occupational information system supported by the U.S. Department of Labor, Employment and Training Administration. Its database includes skills, knowledge, abilities, education and training, career interests, work styles, tasks, work activities, work context, occupation titles, and related occupations. Its services also support occupation search and career-exploration reports. O*NET Web Services overview and the O*NET database page describe the available services and content.
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ESCO: a multilingual European classification
ESCO is the European Commission’s classification of skills, competences, qualifications, and occupations. It is intended to support comparability and mobility across European labour markets, with use cases including job matching, career guidance, learning management, and labour-market analysis. ESCO’s use cases and developer applications explain these aims.
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ESCO organizes occupation concepts in a hierarchy and maps them to the International Standard Classification of Occupations (ISCO). Its skills pillar separates knowledge concepts from skill/competence concepts, but does not further distinguish skills from competences. Concepts include preferred and non-preferred terms and descriptions across ESCO languages. See the ESCO classification structure.
#1 Best Overall
O*NET groups information across worker, job, and relationship or metadata categories. That range can support career profiles and exploration, where tasks, work context, interests, and education or training may matter alongside skills. ESCO’s concepts, hierarchy, and mappings serve a different classification need. Compare the fields and relationships your product actually uses, not just the number of occupation labels.
- Career profiles: Check whether you need tasks, work context, interests, or education and training.
- Skill matching: Compare how each source represents skill and knowledge concepts and how your app will handle user-entered phrases.
- Occupation classification: Check titles, alternative terms, hierarchies, and mappings required by your product.
Geography and language are the first selection criteria
ESCO states that its dataset is available in 28 languages: the official EU languages plus Icelandic, Norwegian, Ukrainian, and Arabic. Language packs are published separately, so confirm that the exact pack and version you need are available. ESCO also says its concept URIs provide unique identifiers that remain consistent over a prolonged period. ESCO language and identifier information describes these features.
O*NET Web Services describes access to data for over 900 occupations and notes quarterly database updates. O*NET also offers Spanish keyword search through Mi Próximo Paso. The “over 900” figure is the current presentation on O*NET’s official service page, not a like-for-like comparison with an ESCO occupation count. O*NET Web Services.
| Decision factor | O*NET is a better starting point when… | ESCO is a better starting point when… |
|---|---|---|
| Primary market | Your app primarily serves the United States and benefits from U.S.-oriented occupation data and career services. | Your app serves European markets and needs a classification intended to support mobility and comparability across them. |
| Content emphasis | You need detailed occupational attributes such as tasks, work context, abilities, interests, and education or training. | You need occupation concepts and hierarchy, ISCO mappings, and multilingual skill or knowledge concepts. |
| Language needs | Your app is English-first or can use O*NET’s dedicated Spanish search option. | Your app needs labels from ESCO’s published language packs. |
| Integration approach | You want database downloads or REST services for search, reports, or database access. | You want a web API, a locally installed API, or classification downloads in supported formats. |
| Update approach | Quarterly database updates fit your import and review cycle. | You can manage explicit dataset or API version selection while retaining persistent concept URIs. |
Choose an API or data import that fits your product
ESCO integration options
ESCO offers a web-service API, a local API, and downloadable classification data. Its download page describes options including RDF/Turtle, JSON-LD, XML, and CSV/ODS; check the formats and versions offered for the specific dataset you intend to consume. ESCO describes its API messages as using an OWL-based data model. ESCO downloads.
The API supports machine-to-machine access. Its official page identifies EUPL 1.2 for the API and Apache 2.0 for several software components; these are software terms and should not be taken as a complete statement of the classification data’s terms. ESCO API services and software licenses.
O*NET integration options
O*NET provides downloadable database files and web services, including keyword search, occupation and career reports, Spanish search, and database access. Its API reference describes REST services that return JSON, require developer registration, and currently use O*NET 31.0. The database page says the database is updated quarterly and that the database service provides access to the latest version. Check the current release and service requirements when planning an integration. O*NET services overview, O*NET API reference, and O*NET database information.
Rank #4
A remote API may reduce the work of importing a full dataset, but it does not eliminate dependencies on service availability, version changes, or caching decisions. A local API or periodic import gives your team more control over data handling, but makes refreshes and change detection your responsibility.
Check licensing before shipping content
Do not assume that every item associated with a database has the same license. O*NET says most of its information is under CC BY 4.0, with attribution to the database and the U.S. Department of Labor and a link to the license; users must also indicate changes. Its license index points to separate terms for database content, web-service data, career-exploration tools, and site content, and warns that third-party materials may have different terms. Review the terms for the exact content or service your app will reproduce. O*NET database terms and attribution and the O*NET license index.
ESCO’s API documentation names EUPL 1.2 for the API and Apache 2.0 for several software components. Verify the terms attached to the classification data, download, and service use separately rather than treating software-license information as the data license. ESCO API licensing information.
A practical selection and implementation process
- Define your audience. List the countries and languages your app must serve; use that scope to identify the most relevant starting source.
- Specify the data you need. Decide whether the product requires occupations, tasks, skills, knowledge, education or training, interests, or mappings to another taxonomy.
- Test representative inputs. Use real job titles and skill phrases from your users. Compare search results, labels, hierarchy, and missing cases in each candidate source.
- Choose an integration model. Weigh latency, availability, privacy, operational ownership, and update needs when choosing a remote API, local API, or periodic bulk import.
- Track provenance. Store the source system, source identifier, version, and last-import date with each concept or mapping. Plan to detect changed labels, retired concepts, and altered relationships.
- Review terms before release. Have the product or legal owner confirm the exact content and API terms, attribution, third-party exceptions, and required change disclosures.
When a global app should use both
A dual-source design can make sense when an app serves both North American and European users. Keep O*NET and ESCO identifiers distinct, and create cross-source mappings only when they have been tested for the product’s use case. Provide alternatives or communicate uncertainty when a relationship is approximate.
ESCO’s official material establishes its links to ISCO, but the sources cited here do not establish a general direct O*NET-to-ESCO crosswalk or one-to-one equivalence. Do not present such equivalence as guaranteed. Neither source’s official pages provide an independent head-to-head accuracy test, so a production choice should be based on your own representative inputs and requirements.
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