Unknown Index
The directory of unknown websites, tools, utilities, and archives most people never discover.
Surprise me →Library of Babel
Hidden WebsitesA website inspired by the Borges story that contains every possible page of 3,200 characters, which you can search to find any text you can think of.
libraryofbabel.info
Low-tech Magazine
Hidden WebsitesA magazine about the past and the future of low-technology solutions, run on a website that is itself powered by solar energy.
solar.lowtechmagazine.com
VisuAlgo
Learning ResourcesAnimated, step-by-step visualisations of data structures and algorithms, from sorting and linked lists to graphs and dynamic programming, with the ability to run each on your own input.
visualgo.net
Recently Added
The latest discoveries added to the index
CPM.calc
Productivity ToolsFree CPM calculator for ad spend and impressions. Calculate cost per 1,000 impressions, estimate budgets, compare channels, and plan your next campaign.
cpm-calculator.xyz
DubTab
AI ToolsReal-time voice translator with natural AI dubbing. Live subtitles, optional bilingual captions, low latency—works on videos, calls, and livestreams in your browser.
dubtab.com
IG Username Checker
Productivity ToolsCheck a public Instagram username signal, generate name ideas, and organize a shortlist. A missing profile never guarantees registration.
igusernamechecker.com
SonicMeet
Productivity ToolsReal-time bilingual captions and accurate translation for Google Meet, Zoom, and Microsoft Teams. Take notes, save transcripts, and stay present in every meeting.
sonicmeet.app
Photo Text Editor
Creative ToolsPhoto text editor for replacing words in pictures. Use free manual tools in your browser, or try AI and inspect the watermarked preview.
phototexteditor.org
Neatbo
Productivity ToolsUse 345 free online tools to compress images, merge PDFs, convert TXT to EPUB, clean CSV and JSON, and calculate subnets. Process files locally without an account.
neatbo.com
Collections
Themed lists of hidden tools worth discovering
7 Useful Websites Most People Have Never Heard Of
7 sitesThe internet is enormous. Most people only ever see the same handful of sites. These seven are worth knowing about.
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5 Free Developer Tools for API Testing and Debugging
5 sitesThese tools are free, powerful, and criminally underused. If you write code, build APIs, or work with data — bookmark these.
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5 Best Free AI Research Tools for Finding Information Faster
5 sitesNot hype. Not chatbots. These AI tools solve real research and data problems that generic tools cannot handle.
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