We built our startup in 100 days

In plain words

We built our startup in 100 days is a platform where people document their progress learning new skills or completing projects over a 100-day period. Users can share daily updates, track their journey, and connect with others pursuing similar goals. The service is designed for anyone interested in personal development, creative pursuits, or accountability-driven learning. It combines video documentation with community support to help people commit to and complete ambitious 100-day challenges.

written from the facts on this page · September 2026

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  100 in 100 Challenge2021 · 100in100.co · ▲533

  Get 100 new paid users in 100 days

• 
  #30DayStartup2018 · ▲598

  Learn to build and launch your startup in 30 days, for free

• 
  100 Days of Code2018 · 100daysofcode.com · ▲306

  Make coding a habit. Join the growing community.

• 
  100DaysOfNoCode Challenge2021 · 100school.com · ▲566

  Learn to no-code in 100 days

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  Work in Progress2018 · wip.co · ▲642

  A community of makers shipping together 🚧

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  100DaysOfAI Challenge2023 · ▲615

  Learn practical AI skills in 100 days

• 
  SimCity, but with Permits▲855

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 20h ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 13d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 14d ago · bigwords.page

• 
  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 8d ago · guitoro.com

• 
  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 12d ago · carrierexplode.com

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  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 22d ago · space.bl2.net

• PG
  Probabilistically Generating HN Post Titles▲683

  Life & fun · 2013 · grantslatton.com

• HD
  Hosted Docker-as-a-Service on SSDs for $5▲387

  Dev tools · 2013 · blog.copper.io

• IM
  I'm working on an open-source Gmail replacement▲387

  Dev tools · 2013 · khamidou.github.io

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  Blinkist▲288

  Key insights from 2,000+ bestselling nonfiction books

  Life & fun · 2013 · blinkist.com

• GC
  Gitter – Chat for GitHub▲243

  Dev tools · 2013 · gitter.im

• 
  Import.io▲239

  Scrape the web, sans manual scripting

  AI · 2013 · import.io