Placid AI Chatbot App

Virtual assistant for primary psychological care.

Placid App portada


For my master thesis, my team and I decided to help solve one of the increasing problems in society, especially after the covid pandemic: supporting people in dealing with stress and anxiety on their daily life.


UX/UI Designer (User Research, Interaction Design, Visual Design, Prototyping)


Jun - Nov 21

Relieve your stress and anxiety with Placid, the intelligent Chatbot game.

Project goal

Create an application that helps users manage stress and anxiety. The app will track the mental state of users, help them talk about it with their loved ones and also seek to improve their mental state before an anxiety crisis occurs.

*Please, be aware that all information in this case study is my team’s: Cesar García, Albert Carreras, Camila Rojas, Aarón Pou and me.

iPhone 12 Mockup Placid

Following the Design Thinking process

We applied the Design Thinking (DT) methodology to empathise with potential users and offer them a simple and intuitive application to which they can resort at any time of stress and anxiety.

Design thinking board & initial sketches


Conducting User Survey and interviews with psychologists

We conducted a user survey to gain user insight and gather ideas to reach the goal of the project. 

We wrote a 13-question survey and shared it with contacts that matched the target user profile. We received 67 responses.

Additionally, we had 3 interviews with specialists in the field of psychology to look for functionalities that could be useful to the stressed and/or anxious user.

survey placid

Benchmarking & online reviews

We also benchmarked +14 apps across different categories such as meditation, anxiety trackers, diaries, and apps that provide guidance to manage stress & chatbots. This allowed us to have an overview of the functionalities the market already offers and the feedback real users have.



User personas: pains & motivations

We created and validated three persona profiles by using the information obtained from the interviews with psychologists, the results obtained from the survey, and the benchmarking from competitors.

Problem definition "how might we..."

Creating the user personas helped us concretize and put together all research data obtained and this was a big step for us to define the problem that our target users were facing and we needed to solve with our app:

How might we design an app that helps anxious and/or stressed users relax while interacting with it, reduce their anxiety levels overtime and be understood by their loved ones?


Features & functionalities to solve users' needs

Based on the research conclusions & user persona profiles, the team and I were able to come up with 3 features for the app after a fun & creative virtual brainstorming session.

AI Chatbot

It is a virtual assistant for primary psychological care that detects states of stress and anxiety. The user communicates with the assistant through text or voice messages and once it has sufficient information, it informs the user of his or her level of stress or anxiety. If necessary, the chatbot suggests a series of recommendations aimed at de-stressing the user. The recommended practices are supported by the practice of clinical psychology.

Share function

It allows the user to share their mood with their most intimate contacts in a semi-automatic way. This eliminates the friction that causes blockage in many stressful and anxious states when communicating their state. It also helps to make the user's inner circle aware of the user's situation and empathize with him or her. Additionally, it makes it easier to ask for professional assistance in the most acute cases.

Stress & anxiety history

Managing stress and anxiety requires time and perseverance. This feature helps to put into perspective the entire evolution of the user throughout the interaction with Placid.

Information Architecture (IA)

The Miro whiteboard platform made it very easy for us to work on our IA remotely and define how our users would interact with the 3 key features.

Information architecture of the app


The Virtual Assistant (VA)

One relevant output from our interviews with the phycologists was the aspect that our VA should have.

Transition design of the VA when interacting with it.

Design System

We applied the color palette established for the VA to the rest of the app for consistency and created the design system for the rest of the UI elements with Figma.

UI screens

Link to Figma prototype here.


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