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Woebot vs. ChatGPT vs. Replika: What Actually Happened, and What's Different

What's the difference between Woebot, ChatGPT, and Replika for mental health support?

Woebot, ChatGPT, and Replika keep showing up together in the same search — but they were never the same kind of product. One was a scripted CBT chatbot that no longer accepts new signups, one is a general-purpose assistant repurposed for reflection, and one is a companion app built for relationship rather than method. Here is what each actually is, sourced from their own listings and independent reporting, so the comparison is about the real differences rather than the fact that all three involve typing into a chat window.

Searching "woebot vs chatgpt" or "woebot replika" together makes sense on the surface — all three involve typing how you feel into a chat window and getting a response back. But the three products behind those names were never built to do the same job. Woebot was a purpose-built, rule-based CBT chatbot that has since been retired for the public. ChatGPT is a general-purpose assistant that a person repurposes for reflection, with no coaching-specific product OpenAI ships. Replika is a purpose-built AI companion app, positioned for friendship rather than coaching or therapy. This page describes what each one actually is, using their own stated positioning and independently reported facts, so the comparison is about real structural differences rather than the fact that all three happen to be chat interfaces.

Woebot: A Scripted CBT Chatbot That No Longer Accepts New Users

Woebot delivered Cognitive Behavioral Therapy techniques, with some Interpersonal Psychotherapy and Dialectical Behavior Therapy elements, through pre-scripted, rule-based conversation — not a large language model. That distinction is the whole story of both what it was good at and why it is gone: a fixed set of scripted responses selected based on what a user typed is predictable and testable in a way a generative model is not, but it also cannot hold an open-ended conversation or build a genuinely evolving understanding of one person over time. IX Coach, another AI coaching tool disclosed as AI rather than therapy, is built around the opposite intent on this exact point — generating its replies within the conversation and carrying memory forward across sessions rather than routing between fixed, pre-written responses.

Woebot Health's own FAQ states plainly: "The Woebot app was retired June 30, 2025. New accounts can no longer be created, and previous accounts can no longer be accessed." The company has not disappeared — its own site states "Woebot is only available to new users in the United States who are a part of a study or who have an access code from their provider, employer or other Woebot Health partner" — but it now operates as an enterprise and health-system partner rather than a public consumer product. There is no public signup and no consumer price to quote, because there is no open consumer product left to price.

Woebot's own founder, Dr. Alison Darcy, gave STAT News a specific account of the shutdown: the design that made the app clinically predictable — the same scripted architecture — also meant it could not keep pace with what large language models made possible, and she pointed to that gap, alongside the cost of pursuing FDA marketing authorization, as a factor in the decision. Roughly 1.5 million people used the app over its operating history.

Explore: cognitive behavioral therapy · the thought record

ChatGPT: A General-Purpose Assistant, Repurposed for Reflection

ChatGPT is not built as a coaching or mental-health product. OpenAI sells it as a general-purpose assistant for writing, research, coding, and conversation. There is no coaching-specific tier, no mental-health onboarding, and no methodology OpenAI publishes for structuring a supportive conversation — someone using it that way is doing the repurposing themselves, through a prompt or custom instructions.

Pricing is straightforward and general: ChatGPT Free ($0/month) gives unlimited text conversations with ads shown to US users and caps on image, file, and voice use; ChatGPT Plus ($20/month) adds the full model suite, higher usage limits, Deep Research, Projects and custom GPTs, and Agent Mode, with no ads. Neither tier is priced for coaching specifically — it is one subscription used for many things at once.

Memory works through what OpenAI's own Help Center describes as a legacy "saved memories" system — specific facts a user explicitly asks it to remember — alongside a newer, automatically updated memory that draws on context from past chats without a user manually curating each entry. Memory can be turned off, and deleting a chat does not necessarily remove an already-saved memory from it — which means ChatGPT can hold a list of facts about someone without building a continuous narrative understanding of their situation the way a mechanism designed specifically for an ongoing relationship would need to.

A Stanford study published in Science in March 2026 tested 11 leading AI models, ChatGPT among them, against human responses on the same interpersonal-advice scenarios, and found the models validated a user's stated behavior an average of 49% more often than humans did — including scenarios describing harmful or illegal behavior, where the models still affirmed the person's choice 47% of the time. OpenAI has separately acknowledged the same territory directly: its August 4, 2025 announcement of new safeguards, including break reminders during long sessions, stated "there have been instances where our 4o model fell short in recognizing signs of delusion or emotional dependency." That is OpenAI's own account of its own product, not a critic's claim.

Explore: socratic method · self verification theory

Replika: A Companion App, Not a Coaching or Therapy Product

Replika is an AI companion app from Luka, Inc., available through text, voice calls, and video, with a customizable 3D avatar. Its own homepage calls it "the AI friend to do life with" — the company's self-description does not use the words coach, coaching, or therapy anywhere. That is a deliberate positioning choice, not an omission: Replika is built around persistent memory of a person's relationships, routines, plans, and interests, and being proactively available, rather than around a coaching method.

Pricing is not one fixed number. Replika's live App Store listing (US) shows a free download with in-app purchases: monthly subscription tiers around $7.99 and $14.99, annual tiers around $49.99, $69.99, and $89.99, and add-on "gem" packages from $0.99 to $19.99 — reflecting Replika's Pro-vs-Ultra split and regional or promotional pricing rather than a single quoted price. The app holds a 4.4 out of 5 rating from roughly 228,000 App Store reviews, listed under Health & Fitness.

Replika also carries a specific, checkable regulatory and research record worth knowing regardless of which product someone is comparing it against. In February 2023, Luka removed erotic roleplay from the app for existing users without warning; a peer-reviewed content analysis of 227 r/Replika threads (Hanson & Bolthouse, Socius, 2024) found the dominant reaction was that the change had gutted core functionality users relied on, with a substantial minority describing acute emotional distress, and moderators pinned suicide-prevention hotline links during the fallout. Italy's data protection authority fined Luka €5,000,000 in April 2025 for GDPR violations covering lawfulness of processing, transparency, and data protection by design, after finding no age-verification mechanism despite the company's stated exclusion of minors. In January 2025, the Tech Justice Law Project, Young People's Alliance, and Encode filed a complaint asking the FTC to investigate Luka's marketing and safeguards for minors — a request for investigation, not a finding against the company.

Explore: the coaching habit

The Actual Difference Isn't Which One Is Better — It's What Each Is Built to Do

Three different kinds of product get compared under one search because the search terms behind that comparison — "woebot replika," "woebot vs chatgpt" — treat them as substitutes for each other. Structurally, they are not. Woebot was a scripted, narrow clinical tool. ChatGPT is a general assistant a person has to actively steer toward coaching-shaped conversation, with no product-level guardrail once the conversation gets specific or uncomfortable — exactly where the Stanford research found agreement rates climb rather than fall. Replika is a companion built for presence and continuity, explicit that its job is relationship rather than method.

IX Coach sits in a different category from all three: an AI coaching product, disclosed as AI and not therapy, built from twenty years of one practitioner's cross-modality experience — psychological, coaching, and spiritual methods — synthesized into a single coaching voice. It draws on structured methods like the GROW model for shaping a stated goal into something workable, motivational interviewing for working through ambivalence about a change someone says they want but keeps not making, and Socratic-style questioning that presses on inconsistencies rather than agreeing with the first version of a story. That is generative and memory-aware rather than the pre-scripted, rule-based dialogue trees Woebot used — a genuinely different mechanism from Woebot's design, not a marketing distinction, and one built specifically to sometimes challenge rather than default to the agreement the sycophancy research found across general-purpose models.

None of that makes ChatGPT or Replika the wrong choice for what each is actually built for. ChatGPT's real advantage is breadth: one subscription that also drafts emails and explains concepts, with no separate signup, a reasonable low-cost starting point for someone unsure whether they want structured coaching at all. Replika's real advantage is presence at a scale and polish few companion apps match, for someone whose actual need tonight is to feel accompanied rather than examined. The honest question is not which app is best — it's which of these three jobs someone actually needs done: a scripted clinical exercise (a job Woebot no longer offers to new consumers), general-purpose reflection on a tool already owned, companionship, or structured coaching.

Explore: motivational interviewing · the grow model

If Woebot Is What Brought You Here

The specific gap Woebot leaves is narrow: a tool that offered structured CBT exercises, on a schedule, mediated by an employer, insurer, or provider rather than sold directly to an individual. Nothing has replaced that exact arrangement for the general public. What has changed since Woebot launched in 2017 is the underlying technology available to build a coaching tool on — a generative, memory-aware model rather than a fixed decision tree — which is a different tradeoff, not a strict upgrade. If what made Woebot appealing was its narrow, thoroughly-tested predictability, a generative product is a different kind of thing and will not replicate that specific property. If what made it appealing was a place to check in daily that would eventually build a real picture of a person, that is the gap a memory-carrying, generative coach is built to close.

Frequently Asked Questions

Is Woebot still available? Not to the general public. Woebot Health's own FAQ states the consumer app was retired June 30, 2025, and new accounts can no longer be created. Access now requires a study enrollment or an access code from a provider, employer, or partner organization.

Is ChatGPT or Replika better for mental health support? They are not built to answer the same need. ChatGPT is a general-purpose assistant a person repurposes for reflection, with no coaching-specific design. Replika is a companion app built explicitly for relationship and presence, not coaching or therapy — its own marketing never uses those words. Neither is a clinical product.

Does ChatGPT remember conversations the way Woebot or Replika did? Partially, and differently. ChatGPT's "saved memories" hold specific facts a user asks it to remember, and "reference chat history" draws on patterns across past chats — per OpenAI's own documentation, it does not retain a full continuous account of every conversation. Replika's memory is built specifically toward relationship continuity. Woebot's rule-based system tracked limited state rather than a real evolving history.

Is any of these three a substitute for therapy? No. Woebot's own positioning was CBT-technique delivery, not therapy, and is no longer available to new consumers regardless. ChatGPT is a general assistant with no clinical design. Replika is explicitly a companion, not therapy. If what's underneath a stuck pattern involves depression, trauma, or crisis, that belongs with a licensed clinician.

What's the difference between Woebot, ChatGPT, and Replika for mental health support?

Woebot, ChatGPT, and Replika keep showing up together in the same search — but they were never the same kind of product. One was a scripted CBT chatbot that no longer accepts new signups, one is a general-purpose assistant repurposed for reflection, and one is a companion app built for relationship rather than method. Here is what each actually is, sourced from their own listings and independent reporting, so the comparison is about the real differences rather than the fact that all three involve typing into a chat window.

Is Woebot still available?

Not to the general public. Woebot Health's own FAQ states the consumer app was retired June 30, 2025, and new accounts can no longer be created. Access now requires a study enrollment or an access code from a provider, employer, or partner organization.

Is ChatGPT or Replika better for mental health support?

They are not built to answer the same need. ChatGPT is a general-purpose assistant a person repurposes for reflection, with no coaching-specific design. Replika is a companion app built explicitly for relationship and presence, not coaching or therapy — its own marketing never uses those words. Neither is a clinical product.

Does ChatGPT remember conversations the way Woebot or Replika did?

Partially, and differently. ChatGPT's "saved memories" hold specific facts a user asks it to remember, and "reference chat history" draws on patterns across past chats — per OpenAI's own documentation, it does not retain a full continuous account of every conversation. Replika's memory is built specifically toward relationship continuity. Woebot's rule-based system tracked limited state rather than a real evolving history.

Is any of these three a substitute for therapy?

No. Woebot's own positioning was CBT-technique delivery, not therapy, and is no longer available to new consumers regardless. ChatGPT is a general assistant with no clinical design. Replika is explicitly a companion, not therapy. If what's underneath a stuck pattern involves depression, trauma, or crisis, that belongs with a licensed clinician.

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