Complement 1, a digital health startup reimagining cancer survivorship, has raised $16 million in Seed funding to scale its AI-powered support platform. Leading the charge are top-tier investors Owl Ventures and Blume Ventures, backing CEO Karan Bajaj’s vision to fill a long-standing gap in oncology: the emotional, behavioral, and lifestyle support that begins after medical treatment ends.

For millions of cancer patients and survivors, the journey doesn’t end with remission. Fatigue, fear of recurrence, lack of clarity around follow-ups - these post-treatment struggles are rarely addressed by the healthcare system. Complement 1 is stepping into that void, offering personalized coaching, intelligent care reminders, and evidence-based lifestyle tools through a seamless platform built for both patients and payers.

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A Platform for the Forgotten Phase of Cancer Care

Complement 1’s app offers real-time coaching, personalized content, and data-driven nudges across key wellness dimensions: nutrition, medication, sleep, and emotional health. It adapts dynamically to each patient’s cancer type, treatment status, and behavioral needs, ensuring that care continues far beyond the hospital doors.

For patients, it’s a daily lifeline. For healthcare systems, it’s a scalable engine for better outcomes.

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A Platform Designed for the Hardest Part of Recovery

Unlike traditional oncology tech that focuses on diagnostics or hospital workflows, Complement 1 lives with the user, empowering patients with smart, timely nudges to manage medication, sleep, nutrition, and stress. The app dynamically adapts to each person’s cancer type, treatment stage, and mental health state - ensuring every interaction is context-aware and clinically relevant.

This approach isn't just about convenience - it's about extending life and quality of life.

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Founders Often Chase Complexity. Complement 1 Wins with Emotional Simplicity.

In healthtech, the temptation is to build platforms that impress regulators, hospitals, or enterprise buyers. But Complement 1 proves something more powerful: if you want to scale in healthcare, you must first win the user's trust - not just their data.

The founders designed every part of Complement 1 to feel emotionally lightweight but behaviorally transformative. Daily guidance doesn’t feel like compliance - it feels like a kind, competent friend who understands oncology. That tone, paired with a seamless UX and deep backend integration with EHRs, is why the company is being fast-tracked into pilot programs with major payers and cancer centers.

Founders building in regulated or emotionally complex markets should take note: empathy is a growth strategy. People don’t just adopt tools that solve problems - they adopt tools that understand them.

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Why the Timing Matters Now

Cancer is not just one of the deadliest diseases globally - it’s one of the most expensive. In the U.S. alone, the economic burden of cancer exceeds $200 billion annually, with post-treatment complications and unmanaged mental health driving significant long-term costs.

More than 18 million cancer survivors live in the U.S. today, a number that continues to grow. Yet many of them lack consistent follow-up care, particularly for behavioral health, lifestyle management, and preventive education - despite these factors being directly linked to recurrence rates and hospital readmissions.

Complement 1 addresses this problem with a proactive, virtual care layer that blends clinical logic with human-centered UX. The company aims to become the standard for post-treatment support, unlocking both health outcomes and payer savings.

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A Growing Market for Survivorship Tech

According to McKinsey, behavioral health integration and patient engagement platforms are among the fastest-growing segments of digital health, especially as employers and insurers shift to value-based care. The oncology software market alone is expected to surpass $7.5 billion by 2030, and survivorship-focused solutions are projected to grow at 18% CAGR over the next five years.

This wave is driven by shifting reimbursement models, patient expectations for digital-first care, and the recognition that chronic diseases don’t end with discharge. Complement 1 sits squarely in this future: proactive, AI-powered, and deeply empathetic.

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Built to Serve All Stakeholders

Complement 1 is purposefully structured to serve patients, providers, and payers alike. It offers:

• Health plans a way to lower total cost of care and increase engagement
  
• Employers a benefits solution with real ROI for at-risk populations
  
• Providers a virtual assistant for ongoing survivorship support
  

This stakeholder-inclusive model positions Complement 1 as more than just a patient app - it's a scalable infrastructure layer for modern cancer care.

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Use of Funds and What’s Next

The newly secured $16 million will be used to:

• Expand Complement 1’s AI and engineering teams
  
• Launch clinical trials and outcome studies
  
• Deepen integration with electronic health records (EHRs)
  
• Scale partnerships with top-tier payers and cancer centers
  

The endgame? To become the digital infrastructure layer for survivorship care, making it as standard as chemotherapy or surgery.