Subversive

Daniel Heintzman is Head of Product at Cal AI, an AI-powered calorie tracking app that grew to over $50M ARR in under two years before being acquired by MyFitnessPal in December 2025. Before Cal AI, Daniel was a product designer with stints at Facebook's Growth team, Robinhood, and Mailchimp, and was later a Designer in Residence at early-stage product fund Chapter One. He started his career as a software engineer at BlackBerry and studied engineering at the University of Waterloo. Daniel also writes about product design and consumer apps on Medium.

Key Takeaways

• Cal AI was launched in May 2024 by two high school students, Zach Yadegari and Henry Langmack, after they spent just a couple months building the initial MVP of the app, which was simple enough to fit on a few core screens.
• From the beginning, they realized distribution would be the bottleneck, so they built the app to be easily understandable within a 10-second TikTok video. This led to super strong product/channel fit and was a key to rapid exponential growth.
• Cal AI went all-in on a creator-first growth strategy, partnering with hundreds of fitness influencers on TikTok to generate millions of impressions. After gaining momentum, the company expanded into traditional paid ads and then affiliate marketing, using these channels to expand their reach and double down on their best-performing creator-generated content.
• Later on, Cal AI added features like streaks, milestones, and progress photos that served as viral artifacts, leading to even more viral organic growth through both offline word of mouth and online posts on social media platforms.
• In less than two years, Cal AI achieved $50M+ in ARR and was acquired by MyFitnessPal in late 2025, not only because of their rapid topline growth but also because their complimentary product positioning and customer base made them an especially attractive acquisition target.

Daniel Heintzman

• Website: https://www.calai.app/
• Portfolio: https://danielheintzman.com/
• LinkedIn: https://www.linkedin.com/in/danielheintzman/
• X: https://x.com/heintzmandaniel

Phil Carter

• Website: https://www.philgcarter.com
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Mikey Shulman is the cofounder and CEO of Suno, an AI music generation platform that allows anyone to create full songs with lyrics, vocals, and instrumentation from a simple text prompt. Prior to founding Suno, Mikey was the first machine learning hire and Head of Machine Learning at Kensho, an AI company acquired by S&P Global for over $500 million. He holds a Ph.D. in Physics from Harvard University, a degree in applied physics from Columbia University, and is a lifelong hobbyist musician.

Key Takeaways

• While working together at another AI company called Kensho, Mikey and a few colleagues who also loved music would often jam after work to blow off steam. Eventually, they decided to combine their AI knowledge and their passion for music into a new startup, with the goal of using AI to help people make music.
• This started with the release of an open-source, text-to-audio model called Bark in April 2023, as well as subsequent product iteration on Discord, both of which helped validate the company’s vision and provide valuable customer feedback.
• By charging users from the very beginning, Mikey and his cofounders were able to ensure that the product they were building was valuable, and that the feedback they were receiving was from credible users who were genuinely interested in not only using Suno, but paying for it to support a viable business.
• After launching Suno’s web app in December 2023, the product spread virally through word of mouth. AI-generated songs proved to be the perfect viral artifact, because music naturally lends itself to riffing and remixes. This viral loop drove Suno to 2M subscribers and $300M in ARR over the course of just two years.
• Suno recently released v5.5, its most powerful model yet. This also included the launch of features like Voices, Custom Models, and My Taste, all of which help creators generate music that is more powerful and more personalized than ever.
• Suno has faced lawsuits from industry incumbents similar to previous music technology companies like Napster and Spotify. However, the company has already made progress settling these lawsuits on favorable terms, including a recent partnership with Warner Music Group to enable licensed AI models. Ultimately, Mikey doesn’t believe it’s a zero sum game, and hopes that Suno can expand the industry by democratizing music creation for the masses.

Mikey Shulman

• Website: https://suno.com/
• LinkedIn: https://www.linkedin.com/in/mikeyshulman/
• X: https://x.com/mikeyshulman

Phil Carter

• Website: philgcarter.com
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Francesco Polizzi is the former Head of Core Experience at Discord, where he led a complete overhaul of the company’s mobile apps. He has also held roles as the Head of Product at both Outschool and Photomath (acquired by Google in 2023), and served as a PM at Dropbox and a growth engineer at Mozilla earlier in his career. Francesco recently left his role as a product executive to start his own stealth AI startup.

Key Takeaways

• When Francesco first joined Discord in late 2021, the company had a thriving community of avid gamers, but it was struggling to expand to a broader, more mainstream audience because new users tended to find the product confusing.
• After product-driven growth efforts began to demonstrate diminishing returns, Francesco and his team realized they needed to more fundamentally redesign the company’s mobile apps to expand their appeal and make them more accessible to new users who felt overwhelmed by Discord’s complexity.
• For inspiration, Francesco and his team downloaded every single messaging app they could find, compiled best practices, and cross-referenced these ideas vs. feedback from Discord users to identify high-potential opportunities.
• This led to a wholesale redesign of Discord’s iPhone and Android apps, including:
  • A voice messaging feature that increased overall message volume
  • A username change that increased the success rate of outbound friend requests by making it easier to find a friend by their username
  • An update to the profile tab that increased customization, paving the way for additional monetization opportunities through Discord’s Nitro and Nitro Basic premium subscription plans, as well as ad hoc purchases
• Ultimately, these changes simplified Discord’s mobile apps, improved the new user experience, fixed a couple important bugs, and accelerated revenue growth

Francesco Polizzi:

• Website: https://discord.com/
• LinkedIn: https://www.linkedin.com/in/francescostl/
• X: https://x.com/Francescostl

Phil Carter:

• Website: https://www.philgcarter.com/
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Jack McDermott is a growth lead at ElevenLabs, where he leads growth for its mobile products — including the ElevenLabs app and ElevenReader, a consumer app built on top of the company’s cutting-edge voice AI platform. Prior to ElevenLabs, he led growth teams at Chegg, where he focused on the company’s skills growth and product during a period of rapid change as AI began reshaping the education category. He started his career in growth at Panorama Education (YC’13). Jack has developed a strong perspective on building and scaling AI-native products, particularly at the intersection of core product, growth, and monetization.

Key Takeaways

• After being founded in April 2022 and launched in January 2023, ElevenLabs has rapidly grown into one of the largest and most successful AI companies in the world with a Voice AI platform that has already been widely adopted by individuals and companies around the world.
• While the company’s core business is an AI platform, it has started to launch vertical apps on top of this foundation, including the ElevenLabs app for creators who want to use ElevenLabs APIs to generate content and the ElevenReader app for consumers who want to consume audio content with custom voices.
• After the company launched ElevenReader in June 2024, Jack and his team initially found traction through bottoms-up marketing tactics on platforms like Reddit and Discord that were great for attracting enthusiastic early adopters. Once the company got traction, it turned to more scalable channels like TikTok, where it gained rapid adoption among readers in BookTok communities.
• Partnerships have also played a key role in ElevenReader’s growth story. The company did a massive partnership with Melania Trump tied to her new memoir called “Melania,” using ElevenLabs APIs to translate the book into dozens of languages that made it more accessible around the globe.
• More recently, Jack and his team have been experimenting with different approaches to subscription pricing and packaging across both the ElevenLabs and ElevenReader apps. Importantly, they have learned that the optimal monetization strategies look very different across these two products, as well as for users making purchase decisions in their native mobile apps vs. on the web.

Jack McDermott:

• Website: https://elevenreader.io/
• Blog: https://elevenlabs.io/blog/authors/jack-mcdermott
• LinkedIn: https://www.linkedin.com/in/jackrmcdermott/
• X: https://x.com/Jackmc

Phil Carter:

• Website: https://www.philgcarter.com/
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Rik Haandrikman is the VP of Growth at RevenueCat, the world’s largest SaaS platform for subscription apps that need help powering in-app purchases, managing customer data, and growing revenue. Prior to joining RevenueCat in 2022, Rik held growth leadership roles at Bitrise and Divitel, and also founded his own eCommerce company called Gimmerce that leveraged printing technology to allow for rapid, cheap, and scalable personalization of products to target niche groups of consumers.

Key Takeways

• Subscription apps are becoming a "winner-take-most market,” with the top 10% of apps growing >300% YoY vs. the median only growing 5% YoY.
• AI has driven a 7x increase in new app launches from 2022 - 2026, but apps launched before 2020 still generate 69% of all revenue.
• AI apps generate 41% more revenue per payer but churn 30% faster, highlighting that many of these apps are still figuring out retention.
• 80-90% of trial starts and half of conversions now happen on Day 0, which means that new user onboarding flows are more important than ever.
• Hard paywalls convert 5x better vs. freemium (10.7% vs. 2.1% install to paid), but after one year, retention rates look nearly identical.
• North America continues to be king, with metrics like D60 RPI and Y1 RLTV ranging from 2.5 - 5x higher vs. the worst-performing regions.

Rik Haandrikman:

• RevenueCat Website: https://www.revenuecat.com
• 2026 SOSA Report: https://www.revenuecat.com/state-of-subscription-apps/
• LinkedIn: https://www.linkedin.com/in/hhaandrikman/
• X: https://x.com/HHaandr

Phil Carter:

• Website: https://www.philgcarter.com/
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Casey Winters is the cofounder and CEO of SuperMe, an AI-native company that is designed to be the professional network for the AI era by connecting users with AI avatars of professional thought leaders. He is also one of the most respected and influential growth leaders in technology, having previously held product and growth leadership roles at Eventbrite, Pinterest, and GrubHub, as well as advised dozens of high-growth tech companies like AirBnB, Canva, and Faire. On the side, Casey is also a teacher, content contributor, and guest speaker for Reforge, and an investor as part of Harry Stebbings’ 20Growth fund.

Key Takeaways

• After starting his career at Apartments.com in 2005, Casey had immediate success but was told he was an odd “product and marketing hybrid” who needed to pick a lane. But Casey wanted to keep working at the intersection of product and marketing, so he decided to join GrubHub as their first growth hire in 2008.
• Over the last two decades, Casey helped define the emerging growth profession, holding product and growth leadership roles at Pinterest and Eventbrite, serving as a Growth Advisor in Residence at Greylock, and advising category-leading tech companies like AirBnB, Reddit, Thumbtack, Canva, Figma, and Faire.
• In April 2024, Casey teamed up with former Pinterest colleague Ludo Antonov to cofound SuperMe, which is building the professional network for the AI era with a platform that ingests blog posts, podcasts, and other content from top experts to build AI avatars capable of providing highly specialized knowledge and expertise.
• Casey and Ludo have built SuperMe as an AI native startup from the beginning. This means everyone they hire is expected to operate like an engineer, with the ability to contribute directly to the codebase. It has also had profound implications on their product development process, which looks significantly different than a traditional SaaS startup given how rapidly LLMs are evolving.
• AI is not only changing how technology products are built but how they grow. One of the growth loops Casey is most excited about is embedding SuperMe into other AI products, so that its AI avatars can automatically be called as “tools” when users have questions that these avatars are uniquely positioned to answer.
• SuperMe’s competitive advantage vs. ChatGPT and Claude is based on quality over quantity. By curating knowledge from the top 1% of experts in each field, and continuously improving responses based on feedback loops between its AI avatars and users, Casey believes that SuperMe can deliver significantly better results vs. horizontal LLMs that base their responses on lower quality inputs.

Casey Winters

• Website: https://www.superme.ai/
• Blog: https://www.caseyaccidental.com/
• LinkedIn: https://www.linkedin.com/in/caseywinters/
• X: https://x.com/onecaseman?lang=en

Phil Carter

• Website: www.philgcarter.com
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io/

Sameer Ahuja is President of GameChanger, which he originally joined as VP of Finance and Analytics in 2017 before being promoted multiple times. He is also an SVP of Dick’s Sporting Goods, which acquired GameChanger in 2016. Prior to joining GameChanger, Sameer founded a boutique hedge fund called Dera Capital Advisors that he ran for six years. He is also a venture advisor for Marquee Ventures.

Key Takeaways:

• GameChanger’s initial core product was built around scorekeeping for youth baseball and softball teams. They built strong product/market fit in this niche and established powerful network effects between coaches, parents, athletes and fans.
• Once the company had established these network effects, they naturally grew through word of mouth both within and across youth sports teams. Coaches loved GameChanger for all of its team management features, and parents and fans enjoyed following the scores of their teams.
• When the COVID pandemic hit in 2020, Sameer and his team recognized that teams were desperate for connection. In one pivotal week, they decided to fast track the development of livestreaming video as a way to ensure family members and other fans were able to stay even more connected with their teams.
• As livestreaming video was being developed, one of GameChanger’s interns identified an opportunity to automatically generate highlight clips from video footage captured during games. The company launched both features in less than a year, and they’ve become a crucial part of the company’s success.
• In 2026, GameChanger launched its most advanced product to date with expanded features for baseball and softball, including livestreaming video in 1080 pixel resolution. Going forward, the company is also excited to continue its expansion into other sports like basketball, soccer, and flag football as part of its mission to become the “home of youth sports.”

Sameer Ahuja:

• Website: https://gc.com/
• LinkedIn: https://www.linkedin.com/in/sameerahuja/

Phil Carter:

• Website: philgcarter.com
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io

Connor Zwick is the cofounder and CEO of Speak, a billion dollar app that is reinventing digital language learning by getting users into real conversations with AI-powered voices. Connor started Speak in 2016 with cofounder Andrew Hsu. Prior to founding Speak, Connor built his first startup called Flashcards+ when he was still in high school and eventually sold it to Chegg. He then went to Harvard, but dropped out to become a Thiel Fellow and found another startup called Coco Controller.

Key Takeaways:

• After dropping out of Harvard to pursue a Thiel Fellowship, Connor became very interested in deep learning along with another Thiel fellow named Andrew Hsu.
• After Connor and Andrew developed a speech recognition model that outperformed all of the existing models at the time, they realized that AI had the potential to revolutionize language learning, which led them to cofound Speak.
• From the beginning, Connor and Andrew believed there was a major gap in the language learning market around immersive language learning. Unlike Duolingo and Rosetta Stone, which focus on helping people learn vocabulary, Speak went all in on AI-powered voice right away to help students learn by speaking.
• For the first four years, Speak exclusively focused on English language learning in South Korea. This is a ruthlessly competitive market, with South Koreans spending 1% of GDP learning English, but this forced Speak to tune its model to be great at one language before the company decided it was ready to expand.
• Since international expansion was part of Speak’s DNA from day one, it allowed the company to expand quickly to other markets once it was ready to grow beyond South Korea. Today, Speak helps people around the world learn six languages, including English, Spanish, French, Italian, Japanese, and Korean. Based on this growth, the company recently raised a Series C at a $1B valuation.

Connor Zwick:

• Website: https://www.speak.com/
• LinkedIn: https://www.linkedin.com/in/connorzwick/
• X: https://x.com/connorzwick

Phil Carter:

• Website: https://www.philgcarter.com
• Substack: https://philgcarter.substack.com
• LinkedIn: https://www.linkedin.com/in/philgcarter
• X: https://x.com/philgcarter

Paul Warren is the founder and CEO of Margins, a beautifully-designed reading app that recently won Apple’s App of the Day award and that reached hundreds of thousands of active readers less than a year after it launched. He is a self-described “extreme reader” who reads hundreds of books every year. Prior to Margins, Paul held CTO and Head of Software roles at multiple companies, including Daylight Computer Company, Darvis, and an undisclosed stealth crypto startup. He holds a Bachelor’s degree in computer science from Stanford University.

Key Takeaways:

• As a self-described “extreme reader” who reads hundreds of books per year, Paul founded Margins in 2023 because he wanted a single integrated platform for discovering new books, tracking all of his reading activity, and keeping up with what his friends were reading.
• Before spending any time on app development, Paul invested nearly a year into building their own proprietary book database, which has become a critical competitive advantage.
• Unlike other reading apps like Goodreads that can feel overly transactional, Paul and his team are obsessed over craft, which has led to delightful features like the ability to search for a book based on “vibes,” as well as lots of fun easter eggs.
• In late 2024, just before the holidays, Paul hired a few microinfluencers to create TikTok content that quickly went viral on BookTok. Then in 2025, the same thing organically happened on X. Margins also recently won Apple’s App of the Day award in December 2025. These spikes have contributed to viral word of mouth, helping to organically propel the company to hundreds of thousands of users just a year after launching.
• While Margins doesn’t yet have any premium features, it has managed to convert many enthusiastic subscribers by appealing to their love of reading and asking them to support the app. That being said, Paul and his team have lots of plans to supercharge Margins’ premium product experience over the next year to further accelerate subscriber growth.

Paul Warren:

• Website: https://margins.app/
• LinkedIn: https://www.linkedin.com/in/paulandrewwarren/
• X: https://x.com/paulwarren_

Phil Carter:

• Website: https://www.philgcarter.com
• Substack: https://philgcarter.substack.com
• LinkedIn: https://www.linkedin.com/in/philgcarter
• X: https://x.com/philgcarter

Podcast Production by Podders: https://podders.io

Weber Wong is the founder and CEO of FLORA, an AI-powered workspace designed to help creative professionals ideate, iterate, and scale their ideas faster than ever before. Prior to founding FLORA, Weber had a diverse range of professional experiences that included stints as an investment banker, a geopolitical researcher, a venture capitalist, and an artist.

Key Takeaways:

• After stints as an investment banker, a geopolitical researcher, a venture capitalist, and an artist, Weber went to NYU’s Interactive Telecommunications Program (ITP) where he studied how to use technology for creative innovation.
• Weber observed that tools for creatives were outdated, and that AI had created the opportunity to reinvent the creative process for marketers, product designers, architects, and other creative professionals. And because Weber is an artist designing for his own needs, it’s given him a very clear vision for FLORA’s product.
• FLORA’s core innovation has been moving beyond single LLM prompts to an infinite workspace that integrates cutting-edge AI models across text, images, and video, allowing creative professionals to continuously iterate on their ideas.
• In two years, FLORA has gained adoption from some of the best creative teams in the world, including industry leaders like Netflix, Nike, Levi’s, WPP, and AKQA. Not only are these companies customers, they are also design partners whose feedback has played a critical role in shaping FLORA’s product vision and strategy.
• Weber expects AI to shift creative tools from a bottom-up paradigm that requires users to manually design creative assets piece by piece, to a far more efficient AI-native paradigm that is top-down, where creatives can start with a rough concept and then iteratively refine it until it’s pixel-perfect.

Weber Wong:

• Website: https://www.florafauna.ai/
• LinkedIn: https://www.linkedin.com/in/weberwong/
• X: https://x.com/weberwongwong

Phil Carter:

• Website: philgcarter.com
• Substack: philgcarter.substack.com
• LinkedIn: linkedin.com/in/philgcarter
• X: x.com/philgcarter

Podcast Production by Podders: https://podders.io