Woebot

» see woebot.io as it lived, on the wayback machine

~ the eulogy ~

Woebot opened in Facebook Messenger in June 2017 and asked how you were doing. If you answered, it walked you through a cognitive behavioral therapy exercise, naming the distorted thought and then trying a different sentence in its place. The replies came from a decision tree written by clinicians rather than from a model generating text, and that was the whole design argument. Every sentence it could utter had been written in advance by clinicians, which closed off any route to an answer a clinician had not sanctioned.

Alison Darcy had taken an unusual route to building it. She studied psychology at University College Dublin, spent time working as a software developer in London, went back for graduate and doctoral degrees in clinical psychology, then did a postdoc at Stanford where she worked alongside Andrew Ng. Woebot Labs came out of that, and the product was shaped at Stanford around students before it was opened to adults generally. The first fourteen sessions were free. After that it ran $12 weekly, or $312 if you paid for the year.

By 2023 the company had raised $123.5 million, including a $90 million Series B in 2021 co-led by Jazz Venture Partners and Temasek, and counted over a million users. The app was retired on 30 June 2025. The company's own FAQ states it without decoration: new accounts could no longer be created and previous accounts could no longer be accessed. Requests for a transcript of your conversations closed on 15 July 2025, and all account data was anonymized by 31 July 2025.

~ the dossier ~

~ the randomized trial ~

Most chatbots launch with a demo video. Woebot launched with a paper. Fitzpatrick, Darcy and Vierhile published "Delivering Cognitive Behavior Therapy to Young Adults With Symptoms of Depression and Anxiety Using a Fully Automated Conversational Agent (Woebot): A Randomized Controlled Trial" in JMIR Mental Health in 2017, the same year the product opened. Seventy Stanford undergraduate and graduate students were given either two weeks of Woebot or a self-help e-book about depression, and the group that got the bot reported a larger reduction in depressive symptoms.

Seventy students over two weeks is a small study and nobody involved pretended otherwise. It still set the terms of every argument that followed about whether software can do therapy, and I have spent more time reading that literature than using any of the products in it. The app's own price list is the measure of the distance: $312 a year, billed in dollars, for a Messenger bot that spoke English. What reached Turkey was the paper and the funding announcements, and those arrive free.

~ the regulatory problem ~

In May 2021 the US Food and Drug Administration granted Breakthrough Device designation to WB001, Woebot Health's digital therapeutic aimed at postpartum depression. That designation is a route, not an approval, and the route costs money. Getting software declared a medical device means clinical evidence and submissions and years of both. Reporting on the shutdown points straight at the resulting tension: a regulatory ambition for the clinical product, funded alongside a free-to-cheap consumer app that generated almost nothing against it.

~ what a scripted bot could not do ~

The second half of the problem was that the thing Woebot refused to do became the thing everyone expected. Its answers were written in advance on purpose, so a user tapped through multiple-choice replies in a conversation that had been authored. By 2024 anyone with a phone could type an unstructured paragraph of their own misery into a general-purpose model and get an unstructured paragraph back for free, with no clinical review anywhere in the loop.

Darcy has described the decision in those terms, as a bot outpaced by how fast the field around it was moving. The safety property that justified the architecture in 2017 read as a limitation by 2025, and the reason it read that way is that the alternative had stopped being careful.

~ june 30 2025 ~

Woebot Health is still a company. Point a browser at woebot.io and it lands on woebothealth.com. That site now sells to providers and payers rather than to people having a bad week, and the FAQ carrying the retirement notice sits inside it. The app is what is buried here. The consumer side was closed out inside a month, with accounts locked on 30 June 2025 and every record anonymized by 31 July. That is eight years to the month after the bot first said hello in Messenger.

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