The number of availability checks of concept4.org over the past 846 days beginning September 17, 2022, reached 4. Concept4.org was found to be active in 4 instances out of all the checks conducted, the latest assessment on June 10, 2024, showed a 200 status. No instances of concept4.org inaccessibility were found during inspections completed as of January 11, 2025. As of January 11, 2025, the replies that were received indicated that there were no reported errors in the responses. The response time noted for concept4.org was 0.558 seconds on June 10, 2024, against a 1.478 seconds average.