I build useful tools for everyday problems.
Simple solutions for learning, thinking,
and living better.
Things you can use
Apps I built
Aquí ContigoFree mental-health support after the earthquake.
Stop SnoringThe ultimate routine to stop snoring.
Depolarize YourselfSee your heroes and villains more clearly.
ParlaiLearn languages on WhatsApp.
TandemGPTPractice a language with an AI partner.
Nine QuestionsChallenge your gut feeling.
Der Die DasNever guess a German noun’s gender again.
Stop SnoringThe ultimate routine to stop snoring.Depolarize YourselfSee your heroes and villains more clearly.ParlaiLearn languages on WhatsApp.TandemGPTPractice a language with an AI partner.Nine QuestionsChallenge your gut feeling.Der Die DasNever guess a German noun’s gender again.
Human Made (Not AI)
Articles I wrote
Juan Herrera
How to Apologize
Juan Herrera
How to Code with AI
Juan Herrera
How to Pick a Co-founder
Juan Herrera
How to Quit Bad Habits
Show old articlesHide old articles18
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