Cal AI
Acquired by MyFitnessPal (closed December 2025, announced March 2, 2026)
Started coding at 7, sold Totally Science for ~$100K at 16, co-founded Cal AI at 17. Named Forbes 30 Under 30 (2026).
Zach Yadegari funded Cal AI with $130K from a prior business exit. He and high school friend Henry Langmack built the MVP in ~7 days after Zach quit MyFitnessPal out of frustration with manual logging. Blake Anderson (RizzGPT) joined as co-founder, bringing AI and distribution experience.
The Receipt
“While technologically cool the app is bullshit. 90% accurate isn't accurate enough for the job and it's effectively making shit up.”
“I think that entrepreneurship is really cool because at the end of the day, age doesn't really matter much. You're either good or not good at what you do, and then the market will decide [the] results.”
— @zach_yadegariThe Journey
Growth trajectory — click a dot to jump
- Jan 2022
milestone Yadegari sells Totally Science (unblocked-games site, 5M users) for ~$100K at age 16.
- Dec 2023
launch Launches Grind Clock (motivational alarm app); gets 20,000 downloads then loses momentum.
- Jan 2024
milestone Teams up with Blake Anderson (RizzGPT, $5M revenue), Jake Castillo, and high school friend Henry Langmack to build a photo-based calorie tracker.
- Apr 2024
launch Cal AI launches on Product Hunt ('One click calorie tracking') and hits the US App Store; MVP built in ~7 days.
- May 2024
milestone First month revenue: $28,000. Initial $2,000 marketing test proved the model; founders scale TikTok influencer spend.
- Jun 2024
milestone Month 2 revenue hits $115,000. TikTok influencer network expands rapidly.
- Sep 2024
milestone MRR crosses $400,000; 100,000+ downloads; 150+ TikTok creators on retainer; premium-only pricing ($10/month).
- Mar 2025
press TechCrunch covers Cal AI: 'Photo calorie app downloaded over a million times was built by two teenagers.'
- Apr 2025
other Hacker News thread: engineers dismiss photo calorie tracking as 'technically impossible.' App continues growing.
- Dec 2024
What they said
“While technologically cool the app is bullshit. 90% accurate isn't accurate enough for the job and it's effectively making shit up.”
What happened
~$8M ARR reached within 8 months of launch; 5M+ total downloads.
December 2024
Criticism → Reality - Apr 2025
What they said
“You can't see the complete composition of the food with a standard camera.”
What happened
Yadegari's college rejection post (15 rejections despite 4.0 GPA, 34 ACT) goes viral with 30M+ views, spiking global Cal AI awareness.
April 2025
Criticism → Reality - Jul 2025
What they said
“There just isn't enough info in a photo, even for the world's leading calorie counting expert, to give a sensible estimate.”
What happened
8.3 million total downloads; paid ad spend reaches $1M/month across Meta and TikTok.
July 2025
Criticism → Reality - Sep 2025
press CNBC profile: ~$30M ARR, $1.4M/month gross profit, 250+ TikTok creator deals exclusive.
- Dec 2025
acquisition MyFitnessPal acquisition closes. Terms undisclosed; Cal AI team retained and product kept standalone.
- Mar 2026
press Acquisition announced publicly; Forbes 30 Under 30 (2026) named. 15M total downloads, $40M cumulative revenue at exit.
Outcomes & Insights
Latest outcome
March 2026
Exit / LTM Revenue / Downloads
Acquired by MyFitnessPal; $40M LTM revenue, 15M total downloads
TikTok influencer network of 150–250+ creators on retainer with referral codes, scaling from $2K test spend to $1M/month in paid social
Premium-only pricing from day one ($10/month, no freemium) — tested and optimized via Superwall A/B paywall tooling
Viral product mechanic: food-scan results are inherently compelling to film and share, making TikTok content essentially write itself
Yadegari's college rejection essay on X (30M+ views) converting massive earned media directly into app installs
I think that entrepreneurship is really cool because at the end of the day, age doesn't really matter much. You're either good or not good at what you do, and then the market will decide [the] results.
💡 What you can learn
- The engineers who called photo calorie tracking technically impossible were right and wrong simultaneously.
- Right that the accuracy is imperfect.
- Wrong that imperfect is fatal.
Apple Search Ads targeting competitor keywords including MyFitnessPal
When they pushed back
When HN engineers declared photo-based calorie tracking technically impossible, the founders didn't redesign the app — they doubled down on TikTok distribution and grew to $8M ARR anyway.
Success patterns
See all patterns →Chat about Cal AI loads when this section enters view.