How to Build an AI Period Tracker App like Flo?

Over the past five years, femtech has experienced significant growth, with apps such as Flo, Clue, and Glow leading the way in the female apps ecosystem. These apps go beyond just predicting menstrual cycles; they analyze symptoms, identify fertility windows, and even flag potential health concerns using advanced AI. 

What truly sets them apart is the integration of AI, which enhances their ability to predict health patterns and deliver personalized insights, providing users with more accurate and actionable health information.

Due to these apps, we’re also observing a sudden growth of female health trackers,

• More than 50 million women worldwide now use fertility and cycle-tracking apps.
• The femtech market is expected to reach $103 billion by 2030.
• AI is revolutionizing the industry by transforming basic tracking into highly personalized health insights.

Unlike traditional period tracking apps that rely on static algorithms, AI-driven apps continuously learn from each user. They adapt predictions based on various factors such as:

• Cycle irregularities
• Symptoms and mood patterns
• Sleep, activity, and biometric data (when synced with wearables)
• User feedback to improve accuracy over time

The result? More accurate predictions, early health alerts, and an experience that’s tailored to each user’s unique needs.

In this blog, we will explore the essential steps to develop an AI app like Flo, from market research to deployment, as we have made over a hundred plus projects that are AI-powered for femtech IdeaUsher has established itself as the go-to partner for businesses looking to create similar solutions. Drawing on this wealth of expertise, we’re excited to guide you step-by-step through the process of developing your AI period tracker app. Let’s dive in!

Overview of the Flo App

The Flo is an app designed to guide individuals through their reproductive health journey, from menstruation to fertility, pregnancy, and menopause. By combining personalized tracking, AI-based predictions, and educational content, Flo provides a comprehensive, user-friendly experience for managing reproductive health.

Here’s how the app works,

1. Personalized Tracking & Predictions

Users start by entering basic details, like the date of their last period and cycle length. They can log daily symptoms such as mood, cramps, sleep patterns, and birth control use. Flo’s AI then processes this data to predict upcoming periods, fertile windows, and ovulation dates. Over time, as more cycles are logged, the AI adapts and improves its predictions, making the app smarter and more tailored to each user.

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2. Fertility, Pregnancy & Beyond

Flo offers different modes to support various stages of reproductive health:

• Getting Pregnant: Tracks fertility signals and provides tips to help users conceive.
• Pregnancy: Delivers weekly updates, milestone checklists, and baby development insights.
• Menopause: Includes features designed for perimenopausal and menopausal users to help them navigate this life stage with confidence.

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3. Health Insights & Community

Flo goes beyond tracking by offering expert-reviewed articles and online courses. It also includes a virtual Health Assistant that provides personalized health advice. The “Secret Chats” community feature lets users engage with one another, share experiences, and provide support on topics like PMS, fertility, and sexual wellness.

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4. Privacy & Data Policies

Flo takes user privacy seriously, employing encryption to protect data. For added security, the app includes an “Anonymous Mode” introduced in late 2022, which removes identifying information for users who want to ensure their data remains private.

A Perfect Time to Invest in Developing an AI Period Tracker App

According to GrandViewResearch, the global market for menstrual health apps is rapidly expanding. Estimated at USD 1.69 billion in 2024, it is projected to grow to USD 5.07 billion by 2030, with a CAGR of 20.24%. This growth is driven by increasing health awareness, rising digital literacy, and the widespread adoption of smartphones and wearable devices, all of which have made it easier for users to manage their menstrual and reproductive health digitally.

Source: GrandViewResearch

AI-powered period tracker apps are leading the charge in this growth. These apps offer personalized cycle predictions, symptom tracking, and health recommendations tailored to each user’s unique patterns. By analyzing data, these apps provide valuable insights into menstrual cycles and fertility windows, allowing users to take a more informed approach to their health.

Flo, for example, is the most downloaded period tracker app as of June 2025, with over 5.2 million downloads. Other popular apps, like Period Tracker and Meiyou, are also growing in popularity. 

Partnerships like Clue’s collaboration with L’Oréal Group, using anonymized data to provide skin-care advice tied to hormonal changes, highlight the growing intersection of wellness and beauty in the digital health space. These advancements are helping users not only track their cycles but also gain deeper insights into their overall health.

AI-driven period tracker apps are gaining significant traction as more people turn to technology to better understand and manage their menstrual cycles, fertility, and overall health. With the increasing demand for personalized health solutions, the potential for profitability in this space is immense. These apps leverage AI to provide tailored insights and predictions, helping users track their cycles and improve their reproductive health management.

The Revenue potential in the AI period tracker market is strong, primarily through subscription-based models. Apps like Clue, which has raised over $30 million in funding, generate significant revenue through their premium subscription model. 

Ovia Health, another key player in the market, has secured more than $15 million in funding and offers personalized fertility and period tracking services to its growing user base. These models ensure sustained growth, with paid subscribers driving their success. 

Opportunities for partnerships with healthcare providers and integration with wearable devices also enhance the profitability of these apps. By offering a seamless and personalized user experience, businesses can tap into a growing market of users eager to improve their health and well-being, making AI period tracker apps a compelling investment opportunity.

Business Model of the Flo App

Flo, launched in 2015 and based in London, UK, is a leading women’s health app that offers menstrual cycle tracking, fertility predictions, pregnancy support, and overall health insights. With a focus on AI and medical expertise, it serves millions of users globally, offering both free and premium features.

Freemium Model & Premium Subscriptions

Flo’s core features, like cycle tracking and symptom logging, are free. However, advanced features such as personalized health insights, in-depth cycle analysis, and access to the AI-powered health assistant are part of the premium subscription. 

Flo has over 16 million users on its premium model, with 5 million paying subscribers. Subscriptions are available monthly or annually, with pricing tailored to each region.

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In-App Purchases

Flo also generates revenue through in-app purchases. Users can buy additional content, such as specialized health plans or features like the Pregnancy Tracker or Birth Control Reminder. These purchases allow users to further personalize their experience.

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Advertisement Revenue

Flo partners with women’s health brands to display targeted ads within the app. These include banner ads, interstitials, and sponsored content such as articles and videos. Advertisement revenue plays a significant role in Flo’s overall earnings, benefiting from the app’s large, engaged user base.

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Affiliate Marketing

Flo earns commissions through affiliate marketing by recommending wellness products to users. When users make purchases through affiliate links, Flo receives a commission. This contributes about 5% of the app’s total revenue.

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Sponsored Content & Collaborations

Flo collaborates with brands and health experts to produce sponsored content, such as articles and videos. These partnerships provide additional revenue while also promoting valuable health information to users.

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Financial Performance

Flo’s revenue reached $200 million in 2023, marking a 29% increase from 2022. The app is expected to generate $263 million in 2024. 

• Over the past three years, Flo has earned approximately $429 million in total revenue. 
• By mid-2024, the app had over 280 million sign-ups, with 62-70 million monthly active users and 5 million paid subscribers. The annual recurring revenue for 2023 was $192 million, reflecting a 40% increase year-over-year.

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Funding Rounds & Valuation

Flo has raised $275.5 million in funding. In July 2024, the company secured over $200 million in a Series C round led by General Atlantic, pushing its valuation to over $1 billion. 

This milestone made Flo the first purely digital women’s health app to achieve unicorn status. Key investors include General Atlantic, Target Global, VNV Global, and Flint Capital.

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Strategic and Social Initiatives

Flo is dedicated to social impact through its “Pass it On” program, which aims to reach 1 billion women by offering free access to Flo Premium in 66 countries. Nearly 12 million women had benefited by mid-2024. Flo is also expanding its focus to cater to perimenopause and menopause users, while investing in R&D to improve its AI-driven health insights.

Features We Add While Developing an AI Period Tracker App

After developing several similar apps, we’ve discovered that certain features consistently add value and enhance the user experience. These features improve usability, drive engagement, and offer more insightful health data.

1. Personalized Health Predictions

Users love receiving personalized health predictions based on their cycle data. Instead of just tracking periods, the app can offer insights on mood swings, energy levels, and other health patterns. This helps users manage their health proactively and feel more in control.

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2. Wearable Device Integration

Integrating with wearables, such as smartwatches and fitness trackers, adds real-time tracking of heart rate, sleep, and activity. This provides users with a more complete picture of their health, helping improve period predictions and overall wellness management.

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3. Customizable Reminders & Notifications

Allowing users to customize their notifications is crucial. Whether it’s a reminder to track symptoms or an alert about their fertile window, personalized reminders make the app more useful and engaging for each individual.

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4. Community and Expert Support

A supportive community is invaluable for users. Including forums or live Q&A sessions with health experts provides a space for users to share experiences and get advice, making them feel more connected and supported throughout their reproductive health journey.

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5. AI-Driven Cycle Analysis

AI can analyze data beyond period tracking, identifying patterns related to mood, diet, and exercise. By offering actionable insights based on this analysis, the app can help users optimize their health and well-being, making it more than just a tracker.

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6. Couple Syncing for Fertility Tracking

For couples trying to conceive, syncing their health data and sharing fertility reports can be highly beneficial. This feature helps both users stay informed and work together in managing fertility, making the process of conception more collaborative.

How to Build an AI Period Tracker App like Flo?

We specialize in creating innovative, AI-powered health applications that deliver personalized experiences for users. To develop an AI app like Flo, we follow a meticulous approach that combines advanced technology with user-centric design. Here’s how we ensure your app is both effective and secure:

1. Define Core Features and User Requirements

We start by working closely with our clients to identify the key features that matter most. This involves understanding the target audience’s needs and defining essential functionalities like cycle tracking, ovulation prediction, symptom logging, and educational content. We ensure the app aligns with user needs from the outset.

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2. Data Collection and User Profiling

Our process includes building an intuitive onboarding experience to collect necessary user data such as cycle length, age, and health habits. This data is crucial for personalizing the app, allowing it to offer more accurate predictions and insights tailored to each individual user.

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3. Develop AI-Powered Prediction Algorithms

We leverage AI to power predictive models that analyze user data and predict menstrual cycles, ovulation days, and fertility windows. The more data the app collects, the more refined and personalized these predictions become, enhancing accuracy and user trust. If you’re looking to develop an AI app like Flo, we can help you create a solution that evolves with user needs and delivers reliable insights.

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4. Design Intuitive UI and UX

Creating an intuitive and easy-to-navigate design is a priority. We focus on building a seamless experience where users can effortlessly log data, track cycles, and receive predictions. The app’s interface is visually appealing yet simple, ensuring users engage with it comfortably.

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5. Implement Secure Data Storage and Privacy Features

We prioritize user privacy and security by employing encryption and privacy features like anonymous mode. All sensitive health data is securely stored and handled in compliance with industry standards, ensuring users’ information is protected at all times.

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6. Integrate Wearables and Health Data Sources

To improve the accuracy of predictions, we integrate with popular wearables and health devices. This allows real-time data collection, such as temperature or activity levels, which enhances the app’s ability to offer precise health insights and more informed predictions.

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7. Create Educational and Personalized Content

Providing educational content is key to empowering users. We work with healthcare professionals to deliver relevant articles, videos, and tips on topics such as reproductive health and wellness. AI personalizes this content, making it more meaningful and actionable based on individual health data.

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8. Enable Reminders and Notifications

We include customizable reminders and push notifications to help users stay on track with their health. These notifications keep users informed about upcoming periods, ovulation windows, and other cycle-related events, offering them timely reminders in a way that fits their preferences.

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9. Test, Optimize, and Iterate

After the initial launch, we continuously test and refine the app based on user feedback and performance analytics. Through A/B testing and iterative updates, we make sure the app evolves, adapting to the needs of users and improving its functionality over time.

Cost of Developing an AI Period Tracker App like Flo

To develop an AI app like Flo, it’s essential to combine personalized health insights with robust data security. The cost will depend on the features, technology stack, and development time required to ensure both accuracy and user privacy.

Stage	Activities Included	Estimated Cost (USD)
1. Research & Planning (Discovery)	– Market & competitor research- Target audience definition- Core feature list- Legal feasibility (HIPAA/GDPR overview)	$1,000 – $5,000
2. UI/UX Design	– User flows, wireframes, mockups- Iconography & graphic design- Interactive prototyping- Basic user testing	$3,000 – $10,000
3. Front-End Development (Mobile App)	– Cross-platform mobile app (React Native / Flutter)- User interactions & navigation- API integration- Core feature screens (cycle tracking, calendar, logging)	$10,000 – $30,000
➤ Key Feature Costs (Examples)	– User Login/Signup: $500 – $1,500- Manual Cycle Tracking: $1,000 – $3,000- Symptom Logging: $800 – $2,500- Calendar View: $1,000 – $3,000- Notifications: $500 – $1,000	(Included above)
4. Back-End Development & Database	– Server setup & configuration- Secure database (user data, cycles)- RESTful API development- User auth & data sync- Push notifications	$8,000 – $25,000
➤ Back-End Feature Costs (Examples)	– User Data Management: $1,500 – $4,000- Cycle Data Storage: $1,000 – $3,000- AI Integration API: $1,000 – $3,000- Notifications Setup: $800 – $2,000	(Included above)
5. AI / ML Integration	– Cycle prediction model (ARIMA, Prophet)- Fertile window & ovulation forecast- Basic symptom correlation- Data preparation- Model training and API integration	$15,000 – $40,000
➤ AI Feature Costs (Examples)	– Period Prediction Model: $5,000 – $15,000- Ovulation Prediction: $4,000 – $10,000- Symptom-Based Insights: $3,000 – $8,000	(Included above)
6. Testing & Quality Assurance (QA)	– Functional testing- Security checks (especially for health data)- AI prediction accuracy validation- Basic automated test coverage	$2,000 – $8,000
7. Project Management & Communication	– Team coordination- Sprint planning- Status updates- Risk & delivery management	$1,000 – $5,000
8. Deployment & Launch	– App Store & Play Store submission- ASO (App Store Optimization)- Preparing store visuals/descriptions- Initial marketing handoff	$500 – $2,000

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Total Estimated Cost: $10,000 – $100,000

The total estimated cost for developing an AI-powered period tracker app like Flo ranges between $10,000 and $100,000, depending on the scope and features. Keep in mind, this is just an estimate. For a precise evaluation, book a free consultation call with us, and we’ll provide a customized estimate based on your requirements.

Factors Affecting the Cost of Developing an AI Period Tracker App like Flo

The cost to develop an AI app like Flo depends on several factors, including the complexity of the AI models and the need for strong data security. Let’s explore the key considerations that affect the overall cost.

AI Model Complexity & Data

The complexity of the AI model directly affects the cost. Basic models that simply predict periods are more affordable, while advanced models that offer personalized health insights, symptom tracking, and fertility predictions require more sophisticated technology and larger datasets. 

Data Privacy & Security

Handling sensitive health data demands high levels of security and compliance with regulations like HIPAA (in the US) and GDPR (in Europe). This involves investing in secure infrastructure, data encryption, regular security audits, and legal consultations, all of which contribute to higher development and operational costs.

Medical Accuracy & Validation

Ensuring the app provides medically accurate health insights means collaborating with healthcare professionals, such as gynecologists and endocrinologists, to validate AI models. This collaboration and ongoing content validation add a significant cost to the development process.

Ethical AI Considerations

For users to trust the app, it’s essential to eliminate AI biases and ensure fair predictions across various demographics. Implementing explainable AI, which makes it clear how predictions are made, adds complexity to the app’s development, further increasing the cost. If you’re looking to develop an AI app like Flo, ensuring transparency and fairness will be key to creating a solution users can rely on.

Conclusion 

AI is revolutionizing period and fertility tracking by delivering personalized insights that make tracking more accurate and empowering. With AI, users can predict cycles, manage their health, and make informed decisions with confidence. If you’re ready to develop an AI app like Flo, reach out to us for a free consultation, and let us help you create a solution that fits your needs.

Looking to Develop an AI Period Tracker App like Flo?

At Idea Usher, we turn your vision for an AI-powered period tracker app into reality. With over 500,000 hours of coding expertise and a team of ex-MAANG/FAANG developers, we specialize in creating intuitive, AI-driven apps that help users track their cycles with precision, offering:

• Accurate cycle predictions powered by advanced AI/ML
• Personalized insights into health and symptoms
• Secure, HIPAA/GDPR-compliant data protection
• Smart analytics for better fertility management

Let us help you bring your AI period tracker app to life with the expertise and technology needed to make it truly impactful.

Check out our recent projects to discover how we can turn your idea into reality.

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