01 / 06The Hall of Human Knowledge
From the Encyclopedia to Wikipedia spend some time in the Hall of Human Knowledge learning how we explore, observe, and record knowledge for future generations.
Back to School / Showcase
The Wall
Every app handed in this month, newest lesson last. Each entry runs at a live URL and teaches exactly one idea — swap between tiles and list, or filter down to the format you want to steal from.
147apps shipped
147in the full wall
Day 31of 31
01Highlight reel
Start with the standouts
Latest builds from the community.
01 / 06
02 / 06SARVAM
Initiate your post cognitive rehabiliation journey with neuro games and robo rehab lower/upper body excercises
03 / 06Behind the Click
Follow what happens after you enter a URL, from DNS and servers to the browser assembling the actual webpage you asked for.
04 / 06The revival
The old web is still here - in the form of the indie web.
05 / 06National Cinema Weekend
Fill up with film facts before heading to the movie theatres for National Cinema Day in the United Kingdom September 5th and 6th, 2026.
06 / 06Well Said
A practical messaging library for founders who want clearer ways to explain their product, value, positioning, traction, and customer pain.
1 of 6
02Full showcase
147 lessons, running live
Showing 147 of 147 builds. Formats are mixed on purpose: the wall is the argument that a lesson can be a cheatsheet, a playground, a game, or a simulator.
Day 31
The Hall of Human Knowledge
From the Encyclopedia to Wikipedia spend some time in the Hall of Human Knowledge learning how we explore, observe, and record knowledge for future generations.
Day 31
SARVAM
Initiate your post cognitive rehabiliation journey with neuro games and robo rehab lower/upper body excercises
Day 31
Behind the Click
Follow what happens after you enter a URL, from DNS and servers to the browser assembling the actual webpage you asked for.
Day 31
The revival
The old web is still here - in the form of the indie web.
Day 30
National Cinema Weekend
Fill up with film facts before heading to the movie theatres for National Cinema Day in the United Kingdom September 5th and 6th, 2026.
Day 30
Well Said
A practical messaging library for founders who want clearer ways to explain their product, value, positioning, traction, and customer pain.
Day 30 
The Death of Flash
What ended on December 31, 2020.
Day 29 
Free Pharma
What if the best vitamins for your mind and body were actually...free? Imagining some of the healthiest practices in the form of an eCommerce website.
Day 29 
Netymology
A field guide to the words, abbreviations, memes, and slang the internet has created along the way.
Day 29 
The image map
Navigation as a picture
Day 28 
The Secret Life of PINs
Four tiny digits, one giant secret: discover some history and fun facts hiding behind every PIN you've ever typed.
Day 28 
Brake Point
Test how quickly you react to road hazards, then see how speed, tires, and road conditions affect your stopping distance.
Day 28 
The forum & the BBS
ANSI terminal, reputation as a visible number.
Day 27 
Who Wants to be a Billionaire? KP Edition
Put your knowledge of everyone's favorite Build In Public guy, community leader, product builder, and startup evangelist to the test with the KP Edition!
Day 27 
Folio
A visual reference library for browsing reusable website layout patterns and understanding when each one works best.
Day 27 
The blogroll
Movable Type, 2003, a feed you curated yourself.
Day 26 
What's In My Bag: Gym Edition
Shaker bottle? Chalk? Wrist Wraps? Oh my! A handy site to find out the essentials people take to the gym to get a good workout in.
Day 26 
Zoomed In
Can you recognize something familiar when you are way too close to it?
Day 26 
Stamps & fanlistings
deviantART, 2006: affiliation before the follow button.
Day 25 
In Good Order
A small lesson on ordering and scheduling tasks for humans and agents working together to get jobs done.
Day 25 
Before The Glow
A guide to the everyday objects people once used for jobs now handled by a single smartphone.
Day 25 
Mob origin
Get to know how mobile originated It's evolution milestones
Day 25 
Adoptables and pixel pets
Neopets petpage, 2001.
Day 24 
Working With Liquid Glass
Before Apple launched "Liquid Glass™️" did you about...liquid glass? Learn about the art of glassblowing from someone who's done it before.
Day 24 
The Button
One small control. A very long history.
Day 24 
Terminal Cheatsheet
Learn essential Terminal commands for macOS and Linux in a few minutes a day, through a glossary + recall practice quiz.
Day 24 
The table layout
Every gap on this page is a picture.
Day 23 
Mechanics & Motives
A blog style website exploring the foundational mechanics and motivations behind popular consumer products.
Day 23 
Brewww
Change the brew. Taste the difference.
Day 23 
Search before Google
AltaVista, 1997: stuff the keywords yourself and watch the page climb
Day 22 
A History Of: Pay to Rank
A timeline of an evergreen concept: can you outbid someone for the status of the top spot? Explore different iterations through history.
Day 22 
What Was That?
Hear it. Guess it. Find out.
Day 22 
Sales Pitch trainer
Sales pitch practice Learn what to say when they say no
Day 22 
The tagboard
A 250 by 200 room in somebody else’s margin, and auto-refresh cost $20 a year.
Day 21 
Meet the UNESCOs
Did you know 25 new UNESCO sites were added in 2026? Discover the latest global treasures that are worth recognising.
Day 21 
PageMap
See what every section of a landing page is actually doing.
Day 21 
Do You Speak AI?
Familiarize yourself with 50 key AI terms through a glossary + recall practice.
Day 21 
DNS journey
Explore more about domain name system and it's terminologies lu
Day 21 
<marquee> & <blink>
One is in the standard today, the other is a 404.
Day 20 
What If I Invested...?
Calculate the opportunity cost of giving up that regular habit and see what you could of saved (or invested) over time.
Day 20 
Memory game
Test your memory, beat increasingly difficult challenges, and discover how your brain remembers information. 🧠⚡
Day 20 
Memory Room
Study a room for 15 seconds, then see how many objects, colors, locations, and tiny details you can remember.
Day 20 
Sound Lab
Change the frequency amplitude inputs and watch the system respond in real time.
Day 20 
The stats page
Somebody’s real 1995 traffic, at a guessable URL, with no login.
Day 19 
Loop Lab
You haven't designed a loop like this one! This simulator let's you model your very own roller coaster! Learn the physics and thrill your customers!
Day 19 
Code breaker
Crack secret messages, master encryption, and learn how your data stays secure online. 🔐🕵️♂️
Day 19 
Look Again
Your eyes see it. Your brain decides what it means.
Day 19 
The GeoCities deletion
Real pages, recovered and held here.
Day 18 
The Bar Exam
Did you know not all protein bars are created equal? Learn about the different types of protein and take The Bar Exam to put your knowledge to the test.
Day 18 
Personal Brand Playbook
A practical guide to building a personal brand through clearer positioning, audience, proof, personality, and visibility.
Day 18 
The hit counter
One number, on your page, that you and every visitor could see at once.
Day 17 
Pulp Fiction
Think you really know how much REAL fruit these popular supermarket items contain? Put your skills to the test with this game.
Day 17 
Cat-lopedia
Everything cat. Probably more than you needed to know.
Day 17 
Computer History
Explore history of computers
Day 17 
Gravity playground
Change gravity, drop objects, and discover how things fall in different worlds.
Day 17 
The tiled background
Forty-two patterns, 3,586 bytes.
Day 16 
Prioritize THIS
Feels like there's too much to do and not enough time? Learn how this simple 2x2 matrix can help you prioritise and how to focus - then play the game!
Day 16 
circuit connect
Build circuits using logic gates to complete levels
Day 16 
What Color Is This Noise?
Hear how white, pink, brown, blue, violet, and gray noise differ while watching their frequency patterns change in real time.
Day 16 
Hosty Helper
Find programs, discounts and perks - Two directories, one host. Look up what's really in your food — allergens, nutrition, safety recalls.
Day 16 
Path Pilot AI
Your path starts with your story
Day 16 
The splash page
A timer, a threshold you clicked, and a gate that checked you first.
Day 15 
Sky-chology
What films are you choosing on your flight? Discover what your picks say about you along with other psychology that happens when you fly.
Day 15 
Light Lab
plant and grow your plant in different light environments.
Day 15 
Spin facts
Spin the wheels and get the facts related to that niche
Day 15 
Anime Decoder
A beginner-friendly interactive guide to anime vocabulary, categories, visual language, release formats, and what to watch next.
Day 15 
MIDI & site music
A twenty track arrangement in 7.6KB, and your machine played it.
Day 14 
Three.js Starter Pack
A simple starter pack for your first time incorporating Three.js, an open-source JavaScript library, that simplifies rendering 3D into your website or app.
Day 14 
Gate Breaker
Learn Logic by building it
Day 14 
Find the Overlap
Find a meeting time the whole team can live with.
Day 14 
Chemistry Lab
Mix different substances and get cool results. You also have a journal the periodic table and more!
Day 14 
View source
No stylesheet, no script - press Ctrl+U and you can read all of it.
Day 13 
Games of the Globe
Learn how to play new games by oldest and most popular in 5 minutes or less - no screens or multi-page instruction booklets needed.
Day 13 
country guesser
an exciting game where you guess a country by its outline
Day 13 
Which Came First?
Guess which of two things came first, then reveal the dates and the story behind them.
Day 13 
Volcano simulation
Learn about volcanoes, evacuate cities,save yourself and get new high scores!
Day 13 
Link rot
A link is a promise somebody keeps paying for.
Day 13 
Geo hsitroy
Play Geo history trivia and flip back to get answers
Day 12 
The Ten Types of Human
Learn about the hidden instincts behind our best and worst moments and take the quiz to find out which ones show up for you.
Day 12 
Word Detective
Decode unfamiliar words using prefixes, roots, and suffixes, then uncover the history behind where those words came from.
Day 12 
The frameset
Persistent navigation, and no address for the page you are on.
Day 12 
Human anatomy
Just select the body part you want to discover out
Day 11 
The Human Brain
Explore and learn about the human brain!
Day 11 
Mystery Box Board: TV Edition
Like a good mystery on TV? Open this pin-board style website to investigate different shows that feel like a mystery box to solve. Case File Set 001.
Day 11 
Real Animal or Made Up?
Can you tell nature’s weirdest creations from creatures we completely made up?
Day 11 
The guestbook
Perl CGI, 1995. Comments you owned, spliced in at an HTML comment. Sign it, it's real
Day 11 
RTG
RTG is a reasoning trivia game 7 qns and check progress
Day 10 
Mental Math
Think math is a waste of time? Discover the link between mathematics and the effect these observed laws have in life, business, and your mindset. It's mental!
Day 10 
request progress
What really happens when you visit a website, turned into an interactive step-by-step journey through DNS, connections, requests, and rendering.
Day 10 
The Side Quest
A digital curiosity cabinet for people who like falling into random rabbit holes.
Day 10 
PAGE FAULT LAB
Page Fault Lab turns invisible virtual memory decisions into an interactive, bilingual simulator where you can watch FIFO, LRU, and OPT handle every page reques
Day 10 
The blinkie
150 by 20, three colors, two frames - shelved by color, never by subject.
Day 10 
Stock Market Simulator
Start with $10,000, trade stocks, and see if you can grow your money over 30 days.
Day 09 
Gravity Lesson
Find out what happens when you drop an object on Earth.
Day 09 
Site awards
A badge has no bottom, but a score out of 100 does.
Day 09 
Tower Of Words
Build your tower, test your knowledge, and stay above the rising water in this fast-paced vocabulary survival game! 🌊
Day 09 
Room Echo Simulator
A hands-on acoustics simulator for hearing and testing how rooms shape sound.
Day 09 
fdr-fireside-legacy
Step into FDR’s presidency, face the choices that shaped a nation, and discover the courage, compromises, and consequences behind one of America’s most conseque
Day 09 
Re:Boot
Unlock the present
Day 08 
Mighty Maize
An interactive site to discover fun facts about the USAs largest crop by volume 🌽
Day 08 
The Psychology of Waiting
Why three seconds can feel like ten.
Day 08 
Bluetooth VZ
Real-time, interactive 3D Web Bluetooth spectrum visualizer that renders live wireless devices, channel hopping
Day 08 
The directory
33 headings on one page, 13 of them shortcuts out of it.
Day 08 
failure-library-museum
A museum of failure where broken ideas, abandoned experiments, and hard-earned lessons become inspiration for what to build next.
Day 08 
Ripple effect
Go back in time and change history.
Day 07 
Question Coach
An interactive coach that helps you turn vague cold emails into clear, respectful requests people can easily answer.
Day 07 
Liar's PDX
An interactive, high-tech web simulation that visually demonstrates the Liar Paradox by driving a virtual logic machine into a spectacular, glitchy crash, follo
Day 07 
Excel - Mentor
A gentle, step-by-step path through the Excel formulas that come up every day in accounting. Ten short lessons, watch-style walkthroughs, and a live practice sh
Day 07 
How a Camera Sees
Follow the light. See how a photograph happens.
Day 07 
The webring
A circle with no index and no owner, routed through one script.
Day 07 
pi-agent brief explained
"Pi, Explained" is the friendliest bilingual mini-book on the Pi coding agent — six short, plain-spoken reads that demystify its loop, tools, memory, and sessio
Day 07 
Nutrition guide
A app you can use to find out what you need to eat to achieve your goals.
Day 06 
What's Your Sign?
Ever wondered where your zodiac sign came from? Enter your birthday and journey among the stars to discover the science behind the constellations.
Day 06 
eismc2
3d interactive web app for general relativity
Day 06 
The custom cursor
A page could take your pointer, and usually should not have.
Day 06 
🌌 OrbitVerse
Watch the planets dance around the Sun. Learn while you explore
Day 06 
Why the Sky Changes Color
Every sky color is light telling you what happened on its way here.
Day 06 
neural-vision-lab
Vision Lab is a bilingual interactive course that takes absolute beginners from a single artificial neuron all the way to a working YOLO object detector through
Day 05 
Fraction Madness
A game where you need to answer a fraction question and if you get it right, you get a point. If you don't get it right, you lose.
Day 05 
Silicon Valley Trail
Learn what it takes to navigate the path to San Francisco as a founder in this startup simulator take of the old classic Oregon Trail.
Day 05 
QubitCraft
Quantum computing made simple
Day 05 
Tiny History: The Everyday Museum
Tiny History is an interactive digital museum featuring 24 ordinary objects.
Day 05 
jiangnan-rumeng
Step into a real-time ink-wash Jiangnan water town where every bridge, roof and boat traces back to real photographs and an 18th-century scroll — a bilingual di
Day 05 
The 88x31 button
GeoCities, 1997, an ad unit that became a friendship token
Day 04 
Skillstax Copywriting Foundations
learn how to write effective copy
Day 04 
SEO or AEO Sorter
Sort search tactics into SEO, AEO, both, or neither and learn the reasoning behind every answer.
Day 04 
Pelagic Atlas
A photographic ocean descent
Day 04 
Teletext & Minitel
Ceefax, 1974, a network with no address bar: you reached a service by knowing its number.
Day 04 
structura-visual-lab
Structura turns abstract data structures into an interactive playground where every step you run maps to a real algorithm—so you don't just watch animations, yo
Day 04 
British Orchard
Pick an apple off the tree and learn all about some of the UK's local varieties just in time for back-to-school season.
Day 03 
Supermarket Quiz
A grocery store quiz to see if you can recognize the best offer out of the group while you do your shopping. Will you come out with the top receipt?
Day 03 
Skillstax Distribution Strategy
Know exactly where to spend your marketing time next month. Five lessons, one channel, one four week plan.
Day 03 
Datacenter Journey
Lets dive in datacenter journey, one request 10 stops What feels instant is a coordinated trip through network, cooling and power systems
Day 03 
Flag to Place
A travel-discovery guide featuring 24 countries across six regions.
Day 03 
recursion-tower-hanoi-lab
This project is an interactive web-based Tower of Hanoi Recursion Lab that lets users solve the classic disk-moving puzzle (with move counters, optimal-move tra
Day 03 
HyperCard
1-bit Macintosh, 1987. The authoring tools were already installed
Day 02 
Ovencraft
The core elements of baking in a periodic table style for any Minecraft fan to start crafting something delicious. Chemistry and Home Economics teacher approved
Day 02 
Conversion Rate Ripple
Shows how small changes in traffic and conversion rates ripple through leads, customers, and projected revenue.
Day 02 
oddpedia
Discover the world’s strangest true facts in a playful, bilingual encyclopedia that turns curiosity into your next favorite habit.
Day 02 
wen-tianxiang-journey
Step into Wen Tianxiang’s final years, make the choices he faced, and discover what courage costs when history leaves no easy path.
Day 02 
The first website
NeXTSTEP, 1990. The browser that could also edit every page it showed you.
Day 02 
yahew.com
A field guide to the old web.
Day 02 
EZ CIRCUITS
Learn circuits by simulation interact with microcontrollers and code lab
Day 02 
Skillstax Cold Email Course
Build a researched cold email sequence through short lessons, examples, and interactive checklists
Day 01 
Learning Principles
A meta way to start off this challenge by looking at principles of how adults learn, rooted in Malcom Knowles' six core principles of andragogy.
Day 01 
CTA Showdown
A fast-paced quiz game that teaches you how to spot clear, specific, clickworthy calls to action.
Day 01 
Mechanics Visualizer
A hands-on physics playground where you drag sliders to see force, motion, and energy come alive in real time — no textbook required
No builds in that format yet
Nothing has been handed in under this format so far. That is an opening, not a gap — ship one and it lands here first.
Ship early: submitted builds get promoted and boosted all month.
03Getting on the wall
The deploy is the entry
Posts amplify a build, they never replace it. Anything with a live URL and one clear lesson qualifies, whatever stack or agent you used to get there.
- BuildAn education themed app. Any stack, any tool, any agent.
- DeployShip it live on Netlify so anyone can open it.
- SubmitAdd the live URL so it lands on this wall.
- SharePost it, mention @netlify, use #NetlifyBackToSchool.
Your lesson belongs on this wall.
One app a day, all August, each one teaching a single idea. Students with a .edu email get a head start, and the best Agent Runners build wins credits every week.