Within the past 819 day period starting August 31, 2022, the operability of substance.hk was checked 1 times. Among all the analyses carried out, substance.hk was accessible 1 times, the last occasion being on August 31, 2022, returning a code 200. As of November 27, 2024, testing indicates that there had been no instances of inoperability for substance.hk. As of November 27, 2024, there have been no reported responses with an error status based on all the received replies. The response time of substance.hk was 0.739 seconds on August 31, 2022, compared to 0.739 seconds on average.