| Legend: | |
| A1 - C2 | : Language level based on CEFR |
| CH | : Swiss German |
| D | : German native speaker |
 Merran, Australia, C2 |
 João, Portugal, C2 |
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 Caroline, Kenya, A1 |
 Angela, Spain, A1 |
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 Enrique, Spain, CH |
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 Yang, China, C1 |
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 Ivan, Russia, B2 |
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Diana, USA, B2 |
Denisa, Romania, C1 |
Magdalena, Poland, C2/CH |
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Petru, Romania, B2/CH |
Katja, Switzerland, D |
Olivier, France, CH |
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Jiri, Czech Republic, CH |
Rannveig, Iceland, CH |
Fabian, Switzerland, D |
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Emily, England, CH |
Kaisa, Finland, CH |
Toshiko, Satoko & Shiho, Japan, CH |
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Anna, Hungary, C1/CH |
Bas & Annemiek, Netherlands, C1 |
Giacomo, Italy, C1 |
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Dimitris, Greece, A2 |
Elina, Finland, A2 |
Carla & Adriana, Romania, CH |
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Jeroen, Belgium, CH |
Khumajun, Uzbekistan, A1 |
Jaghongir, Uzbekistan, A1 |
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Marina, Russia, CH |
Mary, USA, A2 |
Kinga, Hungary, CH |
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Nelly, Russia, CH |
Noora, Finland, CH |
Monique, Germany, CH |
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Peter, Hungary, CH |
Sissy, Greece, A2 |
Paul, England A2 |
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Ville, Finland, A2 |
Vincent, France, CH |
Thayanne, Brazil, C1 |
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Virginia, Switzerland, D |
Yuriko, Japan, C1 |
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Marta, Portugal, B2 
Andras and Zsolt, Hungary, CH
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