A Digital Big Sister

Leveraging AI Technology

All around the world, sexual health is an awkward but crucial topic for young girls to learn about. In some places these topics may not be covered at school and social norms mean the likelihood of them being discussed with family or friends is low. Stigmas are ingrained and misinformation is rife.


As young people increasingly moved to using messaging apps, in 2018 Girl Effect began testing and building a chatbot as an innovative means to reach girls. Using Artificial Intelligence, Girl Effect created a “digital big sister” to give girls a safe, private, non-judgemental and accurate source for information on topics that they don’t feel comfortable discussing elsewhere.


Hundreds of hours have gone into the creation of Big Sis and her persona, with more than 148,000 conversations and more than 2.8 million messages sent by girls to our two bots, in South Africa and India. Big Sis can recognise questions with over 87% accuracy.


"I like her, I love her because she tells the truth and also helps those like me who lack information about protecting ourselves from sex."

17 year old Girl, South Africa

You really know how to heal a broken soul. You're the kindest robot I've ever seen. Thank you for everything.

16 year old Girl, South Africa
Big Sis Chat6

Chat with Big Sis

Make sure you have WhatsApp installed on your phone or computer to access Big Sis. 

Start chatting now

Under the Hood

We have built a dictionary of phrases submitted to us from girls, which our team has categorised and fuels our AI engine. Big Sis is able to predict the category of a question a girl asks based on this knowledge base. The more questions that get asked, the more intelligent Big Sis becomes!


Our Reach

Over 2.8 million

– messages sent and 148,000 conversations initiated

Sexual Health

76% of girls

intend to access a health service before starting a new sexual relationship after chatting to ‘Big Sis’

Girls' Agency

39% of girls

who consume relevant content answer all questions relating to knowledge on communicating with partners correctly, 11% higher than non consumers