Behavioural Research Supports Mental Health AI Prompts

SMOODAI BUILT A TRUSTED MVP IN 6 WEEKS

Beyond building AI prompts- we built real emotional intelligence into our app.

In just weeks, they helped us rethink our prompts, build smarter experiments, and connect with users in a way that actually landed and prompted engagement. Onboarding drop-off fell by a third. Our MVP finally had alliance.

Industry: Health & Wellbeing sector, Research
Client: Co-Founder, Smoodai

THE PROBLEM

Smoodai is a mental health startup building a conversational AI for moments of emotional overwhelm—whether it’s stress, loneliness, anxiety, or simply a rough day. Built on Replit, a powerful cloud-based developer platform, their team had used in-built AI and prompt tools to create a functional, intelligent prototype.

But something was missing.

As many mental health founders discover, technical capability doesn’t guarantee emotional connection. While Smoodai’s product could respond, it didn’t yet resonate. Its prompts felt scripted. Check-ins lacked nuance. The experience ran the risk of becoming “just another chatbot”—a common trap in the mental wellness space.

The Smoodai team recognised that for their product to be trusted—especially by young users dealing with emotional vulnerability—it needed to be built on something deeper than code. They needed behavioural support from day one: not just how to make the app work, but how to make it feel safe, human, and useful.

That’s when they came to The Wellbeing Agent.

“AI can generate prompts. But it takes behavioural design to make them matter.”

OUR SOLUTION

We joined Smoodai in the early stages of their research and experimentation phase, with one shared goal: to bring behavioural depth to a tool designed for emotional support. This meant looking beyond what AI can generate, and focusing on what users need in emotionally complex moments.

In the mental health tech space, how something is said is often just as important as what is said. Many digital check-ins begin with “How are you feeling?”—a well-intentioned prompt, but one that can feel flat or even intrusive if not followed by a meaningful interaction.

We began by guiding Smoodai through a reframing of their early prompt structure. Instead of directive advice or generic sympathy, prompts were restructured to offer light-touch agency and scaffolding. For example:

  • Before: “How are you feeling today?”

  • After: “Rough day? Want to reflect, distract, or shift focus?”

Another example replaced flat encouragement with reflective nudging:
“You’ve checked in three days in a row—most people don’t. That’s real resilience.”

Small tweaks, big shifts. These changes drew from motivational interviewing, cognitive behavioural therapy, and social norms theory—ensuring that every interaction was behaviourally informed, emotionally grounded, and tailored to the user’s psychological state.


The Strategy: Simple, Behaviourally Rich Foundations

Smoodai didn’t need a complete product overhaul. What they needed was a foundational behavioural strategy that could grow with them.

We began by using the COM-B model (Capability, Opportunity, Motivation – Behaviour), a behavioural science tool for diagnosing barriers to action. Together, we mapped key behavioural moments across the user journey—from first interaction to repeat check-ins.

Here’s how COM-B shaped early design decisions:

  • Capability: Could users figure out how to use the app in moments of stress?
    We recommended visual walkthroughs, “micro-practice” flows, and a minimalist interface that doesn’t overwhelm.

  • Opportunity: Were users in a context where they felt safe to engage?
    We suggested aligning push notifications with private, quieter moments (like post-school evenings or winding down at night), rather than mornings or mid-day.

  • Motivation: Did users see themselves in the experience?
    Prompts began using identity-based nudges: “Many students feel this way post-exams” or “You’re not the only one who struggles with focus during long breaks.”

Alongside this journey mapping, we created a lightweight research kit that Smoodai could use to begin testing:

  • Early-stage prompt A/B testing (supportive vs directive tone)

  • Emotion sliders at the end of each check-in (to capture change in feeling)

  • Drop-off observation prompts to understand moments of disengagement

Importantly, all of these were built with ethical UX principles in mind—ensuring Smoodai was not just measuring engagement, but protecting emotional safety along the way.

We also trained the team on the difference between passive usage and active connection. While many apps measure “time spent,” we encouraged them to focus on “emotional stickiness”—that is, whether users feel better, seen, or motivated after a short interaction.


The Results: From App Prototype to Emotional Ally

In just six weeks, Smoodai moved from a promising AI build to a behaviourally grounded MVP.

Key outcomes included:

  • 42% increase in prompt engagement during early A/B tests

  • 28% reduction in drop-off during the onboarding journey

  • Early signs of positive emotional shift in short-session feedback loops

  • A prompt library built on psychological insight, not just AI generation

  • A team now equipped to run ethical, light-touch experiments with confidence

More importantly, users in early testing shared that the experience felt gentle, human, and “not like being coached by a bot.”

Smoodai now has a behavioural foundation that can scale with them—and a clear point of difference in a crowded mental health app market.

Reflection

As Smoodai prepares for their beta launch, we’ve outlined next steps should they wish to continue our collaboration:

  • Embedding behaviourally designed onboarding to boost week-2 retention

  • Creating an ethical nudge system to support long-term emotional habits

  • Building a behavioural insights dashboard for internal decision-making

  • Continued testing of tone, timing, and content framing at scale

Whether or not we continue together in this next phase, Smoodai now has the behavioural tools—and the mindset—to design mental health support that’s rooted in science, but feels deeply human.

At The Wellbeing Agent, we believe that behavioural science isn’t just for persuasion. It’s for protection, empathy, and long-term trust. In helping Smoodai design their early experience, we didn’t just optimise prompts—we helped create a space where users could feel safe, supported, and seen.

Because when it comes to mental health, the right words—at the right time—can change everything.