Built by physicians, for the week between.
TwentyThird is made by WelloWork AB in Uppsala, Sweden. It began inside CognitiveLab, where people kept bringing the team the same question: why do I keep doing this?
A question we kept being asked.
The team — physicians with clinical and research backgrounds — was building cognitive training tools. Friends, colleagues and patients began asking about something else: anxiety, patterns they could not name, the same fight in different decades.
Therapy helps, and waiting lists are long. Between appointments, people are alone with the week. TwentyThird is our answer: an AI that listens every day, inside a plan a licensed psychologist sets.
Why TwentyThird.
In letters to Freud in the 1890s, Wilhelm Fliess argued for a 23-day cycle in human life. Science does not support it, and neither do we.
We kept the number as a metaphor: the day curiosity about yourself turns into awareness. It is a name, not a claim.
Four rules we hold ourselves to.
A human in the loop
The AI supports. A licensed psychologist stays responsible.
No invented numbers
A figure on our site has a source, or it says illustration.
Plain words first
The clinical term comes second, and only when it helps.
Your data is yours
Stored in the EU, never sold, never shown to an employer.
Read how it works, or begin.
If you are in danger, contact local emergency services now — 112 anywhere in the EU. TwentyThird is not an emergency service. How safety works