Manuel Castro

Manuel Castro

Napkin MathNapkin Math
Cofounder @ Napkin Math

About

Building Napkin Math - the personalized AI food journal that builds a nutrionist in your pocket.

Badges

Tastemaker
Tastemaker
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Gone streaking
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Gone streaking 5
Gone streaking 5

Maker History

  • Napkin Math
    Napkin Mathpersonalized AI food journal + nutrition coach
    Jun 2026
  • 🎉
    Joined Product HuntAugust 17th, 2019

Forums

What's your favorite food hack?

Eating fiber first to feel more full! I just down my veggies and then eat the rest of my meal and it makes such a big difference.

2mo ago

What are the 5 tools you simply couldn't do your work without?

This could be related to your industry, or even a side project you're working on.

Here are my 5 (I couldn't function without them):

  1. Grammarly proofreading my texts, not just posts, but also client communication

  2. ChatGPT / Claude mostly brainstorming, help with copy, and summarising

  3. Figma I can put the basic graphics together quickly.

  4. Translator sounds incredibly old-school, but English is not my mother tongue

  5. Gmail and not only for communication, but also for storing ideas and sending myself email reminders for posts

2mo ago

How do busy founders “reset” during weekends, holidays, or vacations?

So far, the impression I have of this community and maker circles is that you work every day.

Which is great, it s one of the reasons I m here.

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