Sunflower
AI app like Duolingo for quitting addictions
Website: https://sunflowersober.com/
Cover Block
| Attribute | Details |
|---|---|
| Company Name | Sunflower |
| Tagline | AI app like Duolingo for quitting addictions [Y Combinator, Fall 2025] |
| Stage | Seed |
| Business Model | B2C |
| Industry | Healthtech |
| Technology | AI / Machine Learning |
| Geography | Global / Remote-First |
| Growth Profile | Venture Scale |
| Funding Label | Undisclosed (total disclosed ~$4,800,000) |
| Accelerator | Y Combinator (Fall 2025) [Y Combinator, Fall 2025] |
Links
- Website: https://sunflowersober.com/
- LinkedIn: https://www.linkedin.com/in/shaiam/
- App Store: https://apps.apple.com/us/app/sunflower-quit-any-addiction/id1547099435
- Google Play: https://play.google.com/store/apps/details?id=app.sunflowersober.com&hl=en_US
- Y Combinator: https://www.ycombinator.com/companies/sunflower
- a16z Speedrun: https://speedrun.a16z.com/companies/sunflower
What an Investor Needs First
Sunflower is an early-stage healthtech startup applying a consumer-first, AI-powered approach to addiction recovery. The company's rapid user growth, from 200 to 100,000 monthly active users in less than six months, suggests product-market fit for its mobile-based sobriety platform [Y Combinator, Fall 2025]. The core product functions as a comprehensive toolkit, combining an AI sobriety coach, visual progress tracking, community features, and educational content, with a nascent integrated telehealth clinic beginning operations in California and Texas [Y Combinator, Fall 2025].
Founder Shai Unterslak leads the company, which was accepted into Y Combinator's Fall 2025 batch [Y Combinator, Fall 2025] [LinkedIn, 2026]. Capitalization includes a pre-seed round of at least $350,000, with backing from a syndicate of early-stage funds including Alumni Ventures, Gaingels, and Flybridge [B2B Movers Daily, 2026]. The business model is B2C, targeting a global, multilingual user base with a freemium app.
Data Accuracy: YELLOW -- Key traction and product claims are sourced from the company's Y Combinator profile; founder and pre-seed funding details have partial corroboration from LinkedIn and a trade publication.
Taxonomy Snapshot
| Axis | Classification |
|---|---|
| Stage | Seed |
| Business Model | B2C |
| Industry / Vertical | Healthtech |
| Technology Type | AI / Machine Learning |
| Geography | Global / Remote-First |
| Growth Profile | Venture Scale |
| Funding | Undisclosed (total disclosed ~$4,800,000) |
Inside the Company
Sunflower's operational footprint is defined by its recent acceptance into Y Combinator's Fall 2025 batch [Y Combinator, Fall 2025]. The primary founder identified is Shai Unterslak [LinkedIn, 2026].
Key operational milestones are concentrated in a short, recent timeline. The company's mobile application has been available on the Apple App Store for several years, but its pivot to an AI-powered sobriety platform appears to have accelerated in 2025. The most significant public milestone is the reported growth from 200 to 100,000 monthly active users in under six months [Y Combinator, Fall 2025]. This period also saw the introduction of an integrated tele-therapy clinic, initially launching services in California and Texas [Y Combinator, Fall 2025].
Capitalization began with a pre-seed round of at least $350,000 [B2B Movers Daily, 2026]. The company's subsequent inclusion in the a16z Speedrun program in 2025 indicates eligibility for further venture funding [a16z Speedrun, 2025].
Data Accuracy: YELLOW -- Founder name and YC batch confirmed via LinkedIn and YC. Pre-seed round and MAU growth cited by single sources each. Headquarters and founding date remain unconfirmed.
Under the Hood
Sunflower's core product is a consumer mobile application that packages a suite of digital tools for addiction recovery, anchored by an AI-driven coaching experience. The company describes its AI component as a "sponsor" for any kind of addiction, including alcohol, nicotine, cannabis, opioids, heroin, gambling, and pornography [Y Combinator, Fall 2025]. This primary feature is supported by several other modules: visual progression tracking, a Twitter-style social feed, DIY educational content, and cognitive behavioral therapy (CBT) based journaling exercises [Y Combinator, Fall 2025]. The app is available in English, Spanish, Japanese, Korean, and Portuguese [Y Combinator, Fall 2025].
The company has also publicly launched a telehealth clinic, beginning with talk therapy services in California and Texas with stated plans to expand to all 50 states [Y Combinator, Fall 2025].
Data Accuracy: YELLOW -- Product claims are sourced solely from the company's Y Combinator profile and app store listings without independent technical review. The telehealth clinic launch is a public claim but operational status is unverified.
Market Research
Available market sizing data is sourced directly from the company's Y Combinator profile, which cites a global population of 1.2 billion people who struggle with addiction [Y Combinator, Fall 2025]. The global digital health market was valued at over $200 billion in 2023 [PitchBook, 2026].
| Metric | Value |
|---|---|
| Reported Global Addiction Population | 1,200 million people |
Data Accuracy: ORANGE -- Market size claim is sourced solely from company profile without independent third-party corroboration. Adjacent market context is drawn from general digital health reports.
Competition and Substitutes
| Company | Positioning | Stage / Funding | Notable Differentiator |
|---|---|---|---|
| Sunflower | AI sobriety coaching & telehealth for multiple addictions | Seed, YC-backed | AI-driven "sponsor" agents; integrated clinic in CA/TX |
| Reframe | App-based program for alcohol reduction | Venture-backed | Neuroscience-based curriculum; prescription option available |
| Sunnyside | SMS-based coaching for mindful drinking | Venture-backed | Lightweight, text-first habit tracking; lower price point |
| I Am Sober | Community-focused sobriety tracker | Bootstrapped / Indie | Strong user-generated community; simple milestone tracking |
Data Accuracy: YELLOW -- Competitor data sourced from PitchBook; Sunflower's positioning and differentiation rely on its Y Combinator profile without independent verification.
Opportunity
The headline opportunity is to become the default, global consumer brand for addiction recovery. The company's demonstrated early velocity includes growing from 200 to 100,000 monthly active users in less than six months [Y Combinator, Fall 2025]. From this foundation, the company is layering on a telehealth clinic, starting in California and Texas [Y Combinator, Fall 2025].
Data Accuracy: YELLOW -- The core traction metric (100k MAU growth) and product roadmap are sourced solely from the company's Y Combinator profile. The a16z Speedrun listing provides a secondary, indirect signal of institutional interest. The market size figure is an unverified company claim.
Sources
- [Y Combinator, Fall 2025] Sunflower company profile | https://www.ycombinator.com/companies/sunflower
- [LinkedIn, 2026] Shai Unterslak - Sunflower 🌻 | https://www.linkedin.com/in/shaiam/
- [B2B Movers Daily, 2026] VC-backed startup Sunflower raises a $350,000+ pre-seed to build an AI Sponsor | https://b2bmoversdaily.com/vc-backed-startup-sunflower-raises-a-350000-pre-seed-to-build-an-ai-sponsor/
- [Apple App Store] Sunflower Quit Any Addiction | https://apps.apple.com/us/app/sunflower-quit-any-addiction/id1547099435
- [a16z Speedrun, 2025] Sunflower | https://speedrun.a16z.com/companies/sunflower
- [PitchBook, 2026] Inside Sunflower’s AI-fueled quest to become the Duolingo of sobriety | https://pitchbook.com/news/articles/sobriety-ai-sponsor-sunflowers-duolingo
- [PitchBook, 2026] Sunflower (Application Software) 2026 Company Profile: Valuation, Funding & Investors | https://pitchbook.com/profiles/company/711621-28
Articles about Sunflower
- Sunflower’s AI Sobriety Coach Has Reached 100,000 Monthly Users — The Y Combinator-backed app, which has grown from 200 users in six months, is now launching a telehealth clinic for addiction treatment.