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 articles17
Solo Polyamory: A Relationship with Yourself14 min read14 minWeekly Check-Ins: Reinforcing Our Bond3 min read3 minThe Most Important Part of an Apology6 min read6 minPolyamory: Fostering Human Connection7 min read7 minDecompartmentalizing Productivity9 min read9 minA Recipe for Open Relationships7 min read7 minRecipe for Urgent Recovery6 min read6 minCómo aprender Inglés en un país hispanohablante8 min read8 minStarting a new life in Austria5 min read5 minNgColombia: Our Community11 min read11 minNgColombia: Our Selection Process3 min read3 minMouse Drag with RxJS4 min read4 minTwo years trying to sleep earlier: This is what I learned5 min read5 min¿Qué es arte? La guía definitiva7 min read7 minSi quieres un cambio en tu vida, debes leer esto3 min read3 min6 cosas que haces todo el tiempo y que deberías dejar de hacer4 min read4 minPor qué tu cumpleaños no debería tratarse de ti2 min read2 min
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Private working sessions for AI coding, difficult apologies, habit change, and co-founder alignment.
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Practical tools and carefully written articles about AI, relationships, habits, and building products. Usually one useful email every few weeks. No noise.
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