Interactive tools & demos

Interactive tools & demos that Hacker News readers keep rediscovering.

Hall of Fame: 63
Candidates: 74
Topics: 16
Median span: 7.3 yrs

Topics in Interactive tools & demos

16 topics

Software engineering 29 links 14 Hall · 15 Candidates Design & creativity 24 links 8 Hall · 16 Candidates Web & internet 18 links 12 Hall · 6 Candidates Computer science 12 links 6 Hall · 6 Candidates Security & privacy 10 links 5 Hall · 5 Candidates Culture & media 8 links 6 Hall · 2 Candidates Hardware & electronics 7 links 0 Hall · 7 Candidates Mathematics & science 7 links 3 Hall · 4 Candidates AI & data 6 links 2 Hall · 4 Candidates History & humanities 3 links 1 Hall · 2 Candidates Medicine & health 3 links 2 Hall · 1 Candidates Society & policy 3 links 1 Hall · 2 Candidates Computer games 2 links 1 Hall · 1 Candidates Education & learning 2 links 2 Hall · 0 Candidates Space & transportation 2 links 0 Hall · 2 Candidates Work & careers 1 link 0 Hall · 1 Candidates

Strongest Hall records

63 items

Pointer Pointer (2012)

pointerpointer.com Tools, games & demos 18 submissions · 18 people · 13.3 years

Hall of Fame Class of 2014-11 Resurfaced 2025-10-09

455max pts

Asciiflow

www.asciiflow.com Tools, games & demos 20 submissions · 20 people · 14.2 years

Hall of Fame Class of 2014-01 Resurfaced 2025-08-27

368max pts

Explain Shell

explainshell.com Tools, games & demos 29 submissions · 29 people · 11.3 years

Hall of Fame Class of 2017-03 Resurfaced 2022-05-30

1372max pts

Compiler Explorer

godbolt.org Tools, games & demos 32 submissions · 31 people · 13.6 years

Hall of Fame Class of 2020-08 Resurfaced 2022-10-16

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WebGL Water

madebyevan.com Tools, games & demos 17 submissions · 16 people · 13.7 years

Hall of Fame Class of 2014-02 Resurfaced 2025-05-10

467max pts

Google Earth for live radios

radio.garden Tools, games & demos 16 submissions · 16 people · 8.8 years

Hall of Fame Class of 2020-06 Resurfaced 2025-10-08

527max pts

Windows93 SP2

www.windows93.net Tools, games & demos 16 submissions · 16 people · 11.3 years

Hall of Fame Class of 2017-06 Resurfaced 2021-07-28

790max pts

Advent of Code 2021

adventofcode.com Tools, games & demos 24 submissions · 22 people · 10.0 years

Hall of Fame Class of 2021-12 Resurfaced 2023-11-28

725max pts

Shellcheck finds bugs in your shell scripts

www.shellcheck.net Tools, games & demos 25 submissions · 22 people · 11.9 years

Hall of Fame Class of 2021-05 Resurfaced 2023-11-23

342max pts

Shapecatcher: Draw the Unicode character you want

shapecatcher.com Tools, games & demos 17 submissions · 16 people · 13.2 years

Hall of Fame Class of 2017-05 Resurfaced 2025-01-18

271max pts

Silk

weavesilk.com Tools, games & demos 12 submissions · 12 people · 13.9 years

Hall of Fame Class of 2015-05 Resurfaced 2024-12-19

687max pts

JSLinux Now Supports x86_64

bellard.org Tools, games & demos 10 submissions · 10 people · 14.8 years

Hall of Fame Class of 2019-07 Resurfaced 2026-03-09

1820max pts

Data Structure Visualizations

www.cs.usfca.edu Tools, games & demos 9 submissions · 9 people · 10.2 years

Hall of Fame Class of 2017-10 Resurfaced 2021-07-06

514max pts

HTTP Cats

http.cat Tools, games & demos 14 submissions · 12 people · 10.4 years

Hall of Fame Class of 2022-05 Resurfaced 2026-01-30

593max pts

Visual and interactive way to learn Git

learngitbranching.js.org Tools, games & demos 14 submissions · 13 people · 8.1 years

Hall of Fame Class of 2024-09 Resurfaced 2024-09-15

342max pts

Regex 101

regex101.com Tools, games & demos 25 submissions · 20 people · 12.7 years

Hall of Fame Class of 2016-11 Resurfaced 2018-08-25

303max pts

Noclip.website – A digital museum of video game levels

noclip.website Tools, games & demos 15 submissions · 15 people · 6.8 years

Hall of Fame Class of 2023-08 Resurfaced 2025-12-19

531max pts

CyberChef – A Cyber Swiss Army Knife

gchq.github.io Tools, games & demos 10 submissions · 10 people · 7.2 years

Hall of Fame Class of 2021-04 Resurfaced 2024-02-01

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Game theory illustrated by an animated cartoon game

ncase.me Tools, games & demos 25 submissions · 24 people · 6.4 years

Hall of Fame Class of 2025-05 Resurfaced 2025-05-19

449max pts

How much your computer can do in a second

computers-are-fast.github.io Tools, games & demos 10 submissions · 10 people · 9.2 years

Hall of Fame Class of 2023-06 Resurfaced 2023-06-22

602max pts

Parable of the Polygons – a playable post on the shape of society

ncase.me Tools, games & demos 34 submissions · 23 people · 9.1 years

Hall of Fame Class of 2024-01 Resurfaced 2024-01-07

357max pts

Panopticlick

panopticlick.eff.org Tools, games & demos 19 submissions · 19 people · 9.7 years

Hall of Fame Class of 2019-10 Resurfaced 2019-10-25

248max pts

Kill the Newsletter – Convert email newsletters into Atom feeds

kill-the-newsletter.com Tools, games & demos 12 submissions · 11 people · 7.8 years

Hall of Fame Class of 2021-02 Resurfaced 2024-08-21 archived copy

344max pts

Hacker Typer - now you can type like a hacker in movies

hackertyper.net Tools, games & demos 16 submissions · 16 people · 13.5 years

Hall of Fame Class of 2024-10 Resurfaced 2024-10-15

272max pts

WebGL Fluid Simulation

paveldogreat.github.io Tools, games & demos 6 submissions · 6 people · 5.6 years

Hall of Fame Class of 2024-07 Resurfaced 2024-12-29

868max pts

RegExr: A website for interactive regex prototyping with syntax highlighting

regexr.com Tools, games & demos 7 submissions · 7 people · 7.8 years

Hall of Fame Class of 2019-08 Resurfaced 2022-01-27

384max pts

PathFinding.js

qiao.github.io Tools, games & demos 12 submissions · 11 people · 7.8 years

Hall of Fame Class of 2019-03 Resurfaced 2019-03-02

337max pts

User Inyerface – A worst-practice UI experiment

userinyerface.com Tools, games & demos 6 submissions · 6 people · 6.8 years

Hall of Fame Class of 2025-12 Resurfaced 2023-05-18

944max pts

Kill sticky headers (2013)

alisdair.mcdiarmid.org Tools, games & demos 11 submissions · 10 people · 10.2 years

Hall of Fame Class of 2019-12 Resurfaced 2025-02-01

267max pts

Crontab.guru – cron schedule expression editor

crontab.guru Tools, games & demos 8 submissions · 7 people · 8.2 years

Hall of Fame Class of 2019-10 Resurfaced 2021-08-30

340max pts

HTML5 Genetic Cars

rednuht.org Tools, games & demos 7 submissions · 6 people · 12.5 years

Hall of Fame Class of 2019-08 Resurfaced 2024-04-27

664max pts

Codeberg – Fast Open Source Alternative to GitHub

codeberg.org Tools, games & demos 12 submissions · 12 people · 6.3 years

Hall of Fame Class of 2023-04 Resurfaced 2025-10-01

503max pts

Online Python Tutor: Learn programming by visualizing code execution

pythontutor.com Tools, games & demos 10 submissions · 10 people · 6.5 years

Hall of Fame Class of 2016-02 Resurfaced 2016-02-29

325max pts

CSS grid garden

cssgridgarden.com Tools, games & demos 6 submissions · 6 people · 7.2 years

Hall of Fame Class of 2024-06 Resurfaced 2024-06-03

426max pts

JSFuck (2012)

www.jsfuck.com Tools, games & demos 7 submissions · 7 people · 13.5 years

Hall of Fame Class of 2021-09 Resurfaced 2021-09-26

364max pts

YouTube videos that have almost zero previous views

astronaut.io Tools, games & demos 8 submissions · 7 people · 9.2 years

Hall of Fame Class of 2023-08 Resurfaced 2019-07-14

1362max pts

10 years since Google said to “hang tight” about Linux support for Google Drive

abevoelker.github.io Tools, games & demos 6 submissions · 6 people · 8.2 years

Hall of Fame Class of 2022-04 Resurfaced 2022-04-24

520max pts

CSS Zen Garden

www.csszengarden.com Tools, games & demos 7 submissions · 7 people · 12.3 years

Hall of Fame Class of 2020-03 Resurfaced 2021-12-24

462max pts

Use YouTube to improve your English pronunciation

youglish.com Tools, games & demos 5 submissions · 5 people · 5.9 years

Hall of Fame Class of 2025-05 Resurfaced 2023-10-30

770max pts

Bad SSL

badssl.com Tools, games & demos 11 submissions · 11 people · 8.6 years

Hall of Fame Class of 2022-09 Resurfaced 2024-03-02

404max pts

Regexper – Regular expressions visualizer

regexper.com Tools, games & demos 7 submissions · 7 people · 11.4 years

Hall of Fame Class of 2018-01 Resurfaced 2018-01-30

510max pts

Matrix Multiplication

matrixmultiplication.xyz Tools, games & demos 8 submissions · 8 people · 8.3 years

Hall of Fame Class of 2022-01 Resurfaced 2022-01-17

873max pts

Transfer.sh – File sharing from the command line

transfer.sh Tools, games & demos 7 submissions · 7 people · 9.9 years

Hall of Fame Class of 2021-07 Resurfaced 2021-07-05

260max pts

Dsxyliea

geon.github.io Tools, games & demos 5 submissions · 5 people · 4.4 years

Hall of Fame Class of 2020-07 Resurfaced 2020-07-13

1356max pts

No-more-secrets: recreate the decryption effect seen in the 1992 movie Sneakers

github.com Tools, games & demos 8 submissions · 8 people · 9.9 years

Hall of Fame Class of 2023-07 Resurfaced 2023-07-20

1002max pts

Frinkiac – 3M "The Simpsons" Screencaps

frinkiac.com Tools, games & demos 8 submissions · 8 people · 9.8 years

Hall of Fame Class of 2025-12 Resurfaced 2025-12-02

340max pts

Bruno Simon – 3D Portfolio

bruno-simon.com Tools, games & demos 11 submissions · 11 people · 6.1 years

Hall of Fame Class of 2025-12 Resurfaced 2025-12-09

777max pts

Speed Test

speed.cloudflare.com Tools, games & demos 6 submissions · 6 people · 6.0 years

Hall of Fame Class of 2025-09 Resurfaced 2023-08-10

664max pts

Structure and Interpretation of Computer Programs: Interactive Version

xuanji.appspot.com Tools, games & demos 7 submissions · 7 people · 9.2 years

Hall of Fame Class of 2021-05 Resurfaced 2019-01-31

458max pts

How I Experience Web Today

how-i-experience-web-today.com Tools, games & demos 7 submissions · 7 people · 4.5 years

Hall of Fame Class of 2024-10 Resurfaced 2024-10-14

985max pts

Spot the Drowning Child (2015)

spotthedrowningchild.com Tools, games & demos 6 submissions · 6 people · 6.2 years

Hall of Fame Class of 2024-07 Resurfaced 2024-07-08

697max pts

Xip.io - a magic domain name that provides wildcard DNS for any IP address

xip.io Tools, games & demos 5 submissions · 5 people · 7.3 years

Hall of Fame Class of 2019-09 Resurfaced 2019-09-10

312max pts

CodingFont: A game to help you pick a coding font

www.codingfont.com Tools, games & demos 7 submissions · 6 people · 4.4 years

Hall of Fame Class of 2026-03 Resurfaced 2026-03-30

499max pts

JSON Web Tokens

jwt.io Tools, games & demos 7 submissions · 7 people · 6.1 years

Hall of Fame Class of 2020-05 Resurfaced 2020-05-26

467max pts

Google Dataset Search

datasetsearch.research.google.com Tools, games & demos 9 submissions · 9 people · 4.4 years

Hall of Fame Class of 2024-06 Resurfaced 2024-06-12

388max pts

Show HN: Search code in GitHub repos using regular expressions

grep.app Tools, games & demos 7 submissions · 7 people · 5.1 years

Hall of Fame Class of 2024-11 Resurfaced 2023-02-07

614max pts

How to Center in CSS

howtocenterincss.com Tools, games & demos 6 submissions · 6 people · 5.1 years

Hall of Fame Class of 2020-05 Resurfaced 2020-05-19

1036max pts

Draw an iceberg and see how it would float in water

joshdata.me Tools, games & demos 5 submissions · 5 people · 4.9 years

Hall of Fame Class of 2026-01 Resurfaced 2024-06-08

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Iknowwhatyoudownload.com – Torrent Activity Checker

iknowwhatyoudownload.com Tools, games & demos 6 submissions · 6 people · 6.9 years

Hall of Fame Class of 2023-11 Resurfaced 2023-11-07

148max pts

Free and Open Source Alternative to Airdrop

www.sharedrop.io Tools, games & demos 5 submissions · 5 people · 9.8 years

Hall of Fame Class of 2024-01 Resurfaced 2024-01-21

228max pts

Recently resurfaced in interactive tools & demos

latest 20+ point return

CodingFont: A game to help you pick a coding font

www.codingfont.com Tools, games & demos 7 submissions · 6 people · 4.4 years

Hall of Fame Class of 2026-03 Resurfaced 2026-03-30

499max pts

JSLinux Now Supports x86_64

bellard.org Tools, games & demos 10 submissions · 10 people · 14.8 years

Hall of Fame Class of 2019-07 Resurfaced 2026-03-09

1820max pts

HTTP Cats

http.cat Tools, games & demos 14 submissions · 12 people · 10.4 years

Hall of Fame Class of 2022-05 Resurfaced 2026-01-30

593max pts

Noclip.website – A digital museum of video game levels

noclip.website Tools, games & demos 15 submissions · 15 people · 6.8 years

Hall of Fame Class of 2023-08 Resurfaced 2025-12-19

531max pts

Bruno Simon – 3D Portfolio

bruno-simon.com Tools, games & demos 11 submissions · 11 people · 6.1 years

Hall of Fame Class of 2025-12 Resurfaced 2025-12-09

777max pts

Candidates

Browse 74 candidates

Cdecl – Turns English phrases into C declarations

cdecl.org Tools, games & demos 21 submissions · 21 people · 15.0 years

Candidate Resurfaced 2024-11-11

Needs:2 breakout events 720+ days apart

163max pts

Draw a math symbol and get the corresponding LaTeX code

detexify.kirelabs.org Tools, games & demos 19 submissions · 18 people · 16.7 years

Candidate Resurfaced 2023-11-14

Needs:2 breakout events 720+ days apart

193max pts

Nuke Map: Interactive Nuclear Bomb Map

nuclearsecrecy.com Tools, games & demos 28 submissions · 27 people · 14.0 years

Candidate Resurfaced 2022-03-01

Needs:2 breakout events 720+ days apart

160max pts

Git Cheatsheet (Visualization)

www.ndpsoftware.com Tools, games & demos 12 submissions · 12 people · 12.4 years

Candidate Resurfaced 2023-02-07

Needs:2 breakout events 720+ days apart

255max pts

Hckr news – Hacker News sorted by time

hckrnews.com Tools, games & demos 14 submissions · 13 people · 15.6 years

Candidate Resurfaced 2022-10-03

Needs:2 breakout events 720+ days apart

168max pts

Wide-Band WebSDR – Shortwave Radio on the Internet

websdr.ewi.utwente.nl Tools, games & demos 16 submissions · 16 people · 13.2 years

Candidate Resurfaced 2022-04-20

Needs:2 breakout events 720+ days apart

201max pts

Pink Trombone

dood.al Tools, games & demos 9 submissions · 9 people · 8.5 years

Candidate Resurfaced 2019-01-15

Needs:2 breakout events 720+ days apart

575max pts

Experience the Apollo 11 Lunar Landing

www.firstmenonthemoon.com Tools, games & demos 14 submissions · 14 people · 11.8 years

Candidate Resurfaced 2024-08-30

Needs:2 breakout events 720+ days apart

257max pts

This page is a truly naked, brutalist HTML quine

secretgeek.github.io Tools, games & demos 4 submissions · 4 people · 5.9 years

Candidate Resurfaced 2022-09-25

Needs:5 submissions

952max pts

After Dark Screensavers in CSS

www.bryanbraun.com Tools, games & demos 6 submissions · 6 people · 7.1 years

Candidate Resurfaced 2023-03-05

Needs:2 breakout events 720+ days apart

555max pts

Carbon: Create and share images of source code

carbon.now.sh Tools, games & demos 7 submissions · 7 people · 6.1 years

Candidate Resurfaced 2021-10-15

Needs:2 breakout events 720+ days apart

247max pts

ISS Docking Simulation

iss-sim.spacex.com Tools, games & demos 10 submissions · 9 people · 6.0 years

Candidate Resurfaced 2022-01-05

Needs:2 breakout events 720+ days apart

329max pts

Instant.io – Streaming file transfer over WebTorrent

instant.io Tools, games & demos 8 submissions · 8 people · 8.9 years

Candidate Resurfaced 2016-09-18

Needs:2 breakout events 720+ days apart

349max pts

VisuAlgo – visualising data structures and algorithms through animation

visualgo.net Tools, games & demos 10 submissions · 10 people · 7.9 years

Candidate Resurfaced 2025-03-16

Needs:2 breakout events 720+ days apart

280max pts

Creating a QR Code step by step

www.nayuki.io Tools, games & demos 4 submissions · 4 people · 6.0 years

Candidate Resurfaced 2024-11-17

Needs:5 submissions

329max pts

Don't just shorten your URL, make it suspicious and frightening (2010)

shadyurl.com Tools, games & demos 8 submissions · 7 people · 12.2 years

Candidate Resurfaced 2022-05-15

Needs:2 breakout events 720+ days apart

232max pts

Free unlimited rebooting experience from vintage operating systems

www.therestartpage.com Tools, games & demos 10 submissions · 10 people · 12.3 years

Candidate Resurfaced 2016-04-15

Needs:2 breakout events 720+ days apart

144max pts

Happy 1600M epoch second

www.epochconverter.com Tools, games & demos 4 submissions · 4 people · 13.6 years

Candidate Resurfaced 2023-11-14

Needs:5 submissions

373max pts

PhotoPea: Advanced Image Editor

www.photopea.com Tools, games & demos 12 submissions · 12 people · 7.8 years

Candidate Resurfaced 2026-02-20

Needs:2 breakout events 720+ days apart

161max pts

WebSDR: Software-Defined Radio receiver connected to the internet

websdr.org Tools, games & demos 8 submissions · 8 people · 15.0 years

Candidate Resurfaced 2023-10-26

Needs:2 breakout events 720+ days apart

265max pts

DNS Toys

www.dns.toys Tools, games & demos 7 submissions · 7 people · 3.1 years

Candidate Resurfaced 2024-01-07

Needs:2 breakout events 720+ days apart

946max pts

If it were my home

www.ifitweremyhome.com Tools, games & demos 4 submissions · 4 people · 11.0 years

Candidate Resurfaced 2022-01-30

Needs:5 submissions

228max pts

Recursive Drawing

recursivedrawing.com Tools, games & demos 4 submissions · 4 people · 11.5 years

Candidate Resurfaced 2023-10-30

Needs:5 submissions

694max pts

Same.energy: Image Search by Similarity

same.energy Tools, games & demos 14 submissions · 14 people · 5.4 years

Candidate Resurfaced 2023-02-01

Needs:2 breakout events 720+ days apart

185max pts

Google Will Eat Itself (2005)

www.gwei.org Tools, games & demos 5 submissions · 5 people · 13.8 years

Candidate Resurfaced 2022-06-12

Needs:2 breakout events 720+ days apart

210max pts

Visual 6502 in JavaScript

visual6502.org Tools, games & demos 9 submissions · 9 people · 9.4 years

Candidate Resurfaced 2020-02-10

Needs:2 breakout events 720+ days apart

155max pts

Turtletoy

turtletoy.net Tools, games & demos 4 submissions · 4 people · 7.0 years

Candidate Resurfaced 2025-12-03

Needs:5 submissions

382max pts

Kinopio

kinopio.club Tools, games & demos 7 submissions · 7 people · 5.0 years

Candidate Resurfaced 2022-05-21

Needs:2 breakout events 720+ days apart

499max pts

SQL Fiddle

sqlfiddle.com Tools, games & demos 11 submissions · 10 people · 8.6 years

Candidate Resurfaced 2013-10-09

Needs:2 breakout events 720+ days apart

171max pts

Parinfer – Simpler Lisp Editing

shaunlebron.github.io Tools, games & demos 12 submissions · 6 people · 8.1 years

Candidate Resurfaced 2025-01-20

Needs:2 breakout events 720+ days apart

200max pts

This word does not exist

www.thisworddoesnotexist.com Tools, games & demos 3 submissions · 3 people · 3.0 years

Candidate Resurfaced 2023-05-15

Needs:5 submissions

1184max pts

Show HN: Seashells – Pipe output from CLI apps to the web in real time

seashells.io Tools, games & demos 4 submissions · 4 people · 5.8 years

Candidate Resurfaced 2021-10-18

Needs:5 submissions

356max pts

8bit Workshop

8bitworkshop.com Tools, games & demos 8 submissions · 8 people · 7.9 years

Candidate Resurfaced 2022-09-12

Needs:2 breakout events 720+ days apart

281max pts

Show HN: Full text search on 630M US court cases

www.judyrecords.com Tools, games & demos 3 submissions · 2 people · 4.4 years

Candidate Resurfaced 2025-04-18

Needs:5 submissions3 submitters

698max pts

Show HN: See a Satellite Tonight. No Telescope Required

james.darpinian.com Tools, games & demos 5 submissions · 5 people · 5.9 years

Candidate Resurfaced 2022-11-01

Needs:2 breakout events 720+ days apart

863max pts

Maze Algorithms (2017)

www.jamisbuck.org Tools, games & demos 6 submissions · 5 people · 14.1 years

Candidate Resurfaced 2026-01-23

Needs:2 breakout events 720+ days apart

183max pts

Float Toy

evanw.github.io Tools, games & demos 4 submissions · 4 people · 8.1 years

Candidate Resurfaced 2022-08-19

Needs:5 submissions

649max pts

Markdown.css – make HTML look like plain-text

mrcoles.com Tools, games & demos 4 submissions · 4 people · 8.1 years

Candidate Resurfaced 2016-12-28

Needs:5 submissions

420max pts

Touch Pianist

touchpianist.com Tools, games & demos 3 submissions · 3 people · 8.3 years

Candidate Resurfaced 2023-09-08

Needs:5 submissions

837max pts

YOLO: Real-Time Object Detection

pjreddie.com Tools, games & demos 6 submissions · 6 people · 3.8 years

Candidate Resurfaced 2019-04-02

Needs:2 breakout events 720+ days apart

320max pts