The standsurv command estimates standardized survival curves and related measures. It also allows various contrasts between the standardized functions. It is a post-estimation command and can be used after fitting a wide range of survival models. These include streg models (except generalized gamma), stpm2 models and strcs models.
Note I previously developed stpm2_standsurv, which only works with stpm2 models, but standsurv superceeds that. You can do the same things with standsurv and much, much more.