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TraceTogether Logo.png
OpenTrace Android Screenshot.jpg
Developer(s)Government Technology Agency
Repository Edit this at Wikidata
Written in
  • Kotlin (Android)
  • Swift (iOS)
Operating systemAndroid, iOS

TraceTogether is an app released by the Singaporean Government that allows for digital contact tracing using the custom BlueTrace protocol.[1][2] The app was developed by the Government Technology Agency and released on 20 March 2020. Since release the app has been downloaded over a 500,000 times.[3] The app and protocol were also open sourced as OpenTrace and BlueTrace respectively.


TraceTogether is explicitly designed to preserve the privacy of every user. In order to achieve this, personal information is only collected once at registration, and is not used except to contact potentially infected patients. Users are only able to request opt-out via an email to a government agency.[4] To trace users the Ministry of Health (MOH) issues time sensitive anonymous temporary IDs that are used to identify the patient to all third parties. When two users of the app pass by, the devices exchange temporary IDs and store them in a contact history log. This log chronicles every user the patient has encountered in the last 21 days, and is stored exclusively on the user's device. Once a user tests positive for infection, the MOH requests the contact log. The user cannot legally refuse to share the log.[5] If a user opts out, their contact information is deleted from the MOH, meaning any log entries they appear in can no longer be matched with them.[6]


  1. ^ "Home". Retrieved 2020-04-12.
  2. ^ Sharwood, Simon; at 01:58, APAC Editor 26 Mar 2020. "Singapore to open-source national Coronavirus encounter-tracing app and the Bluetooth research behind it". Retrieved 2020-04-12.
  3. ^ "TraceTogether - Google Play Store". Archived from the original on 2020-04-12. Retrieved 2020-04-13.
  4. ^ "How can I stop sharing my data?". Government Technology Agency. Retrieved 2020-05-28.
  5. ^ "Can I say no to uploading my TraceTogether data when contacted by the Ministry of Health?". Government Technology Agency. Retrieved 2020-05-28.
  6. ^ Jason Bay, Joel Kek, Alvin Tan, Chai Sheng Hau, Lai Yongquan, Janice Tan, Tang Anh Quy. "BlueTrace: A privacy-preserving protocol for community-driven contact tracing across borders" (PDF). Government Technology Agency. Retrieved 2020-04-12.CS1 maint: multiple names: authors list (link)