Hello @Keyjam
Welcome to the Wefugees community and thank you for your question.
We had questions circling around the topic of traveling with a blue passport in the past. Please check out this thread here on Wefugees for further information:
https://***.wefugees.de/102024/which-countries-visit-passport-addition-switzerland-example?show=102024#q102024
You'll find a comprehensive list of all countries that you can visit visa-free with such a passport. South Africa is not on said list, so you need a visa in order to travel there.
Best regards,
Thorgen