Trade Republic


Keep in mind that they offer 4% on Euros, not Swiss francs. So, if you are in Switzerland, you will introduce a significant currency risk.

Other than that, it seems like it's relatively well-regarded by people, but I have never done a full review of this service.
According to Trade Republic's FAQ, they currently don't open accounts for Swiss residents.

At the moment, Trade Republic is available in Germany, Austria, France (including French Guiana, Guadeloupe, Martinique, Mayotte, Réunion and Saint-Martin), Spain, Italy, the Netherlands, Belgium, Luxembourg, Finland, Ireland, Greece, Portugal, Estonia, Latvia, Lithuania, Slovenia and Slovakia.