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Retrocodex
Fix outdated parts of your education and unlearn myths.
Many things you've been taught in school or everyday life is now outdated or was always a myth, like "you only use 10% of your brain". Retrocodex is a platform that documents common misconceptions and outdated information submitted by users from all over the world. What you learned often depends on where you're from, so follow other users who grew up in the same state or country as you to discover what your part of the world got wrong!
I was inspired to start creating this site in September 2025 when I saw a post on Instagram that said "website idea: you input the year you graduated high school and the website generates a list of outdated "facts" and concepts that have since been disproven." Here's the post: https://www.instagram.com/p/DOqa...
The post had been going around for 5 years and hardly anyone made or maintained the site! I could see why: most facts don't have a hard cutoff year for when they stopped being taught in schools and what is taught in school varies wildly throughout the world, so the prompt was technically impossible.
But after reading through thousands of comments from people demanding it exists, I felt compelled to figure out a workaround especially after seeing "I know I'm living life with an outdated operating system". I didn't want myself or anybody else to have that. Just reading the comments on the post made me realize how much of life I don't know, including all the outdated info and myths I believed!
So I found the workarounds: I'd classify the facts by DECADE rather than year to give wiggle room for when each fact's lifespan started fading. I'd also give users easy access to ALL the facts on the site just in case the decade discovery method wasn't inclusive enough of your reality. Besides school facts, I also added old wives' tales and media misinformation (commonly spread scientific and historical claims only, not things people are doing). I also added special pages dedicated to countries that no longer exist or slang that evolved: https://theretrocodex.com/evolvi...
To add even more factual precision and inclusivity, I decided to upgrade it from a simple site to an entire community platform: instead of just me listing facts on pages only I can modify, users will be submitting facts with the country/state and what decade they learned them. To further account for the regional variation pain point from the social media comments, users have the option to select and display your country/state so other people who grew up where you did can follow you and learn what your part of the world got wrong.
I hope you enjoy it and I look forward to learning what you're unlearning! What fact on the site surprised you most?
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About Retrocodex on Product Hunt
“Fix outdated parts of your education and unlearn myths.”
Retrocodex was submitted on Product Hunt and earned 8 upvotes and 3 comments, placing #93 on the daily leaderboard. Many things you've been taught in school or everyday life is now outdated or was always a myth, like "you only use 10% of your brain". Retrocodex is a platform that documents common misconceptions and outdated information submitted by users from all over the world. What you learned often depends on where you're from, so follow other users who grew up in the same state or country as you to discover what your part of the world got wrong!
Retrocodex was featured in Education (78.4k followers), Social Networking (1.7k followers) and UX Design (6.8k followers) on Product Hunt. Together, these topics include over 29.8k products, making this a competitive space to launch in.
Who hunted Retrocodex?
Retrocodex was hunted by Christina Nguyen. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Retrocodex stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Christina Nguyen
I was inspired to start creating this site in September 2025 when I saw a post on Instagram that said "website idea: you input the year you graduated high school and the website generates a list of outdated "facts" and concepts that have since been disproven." Here's the post: https://www.instagram.com/p/DOqa...
The post had been going around for 5 years and hardly anyone made or maintained the site! I could see why: most facts don't have a hard cutoff year for when they stopped being taught in schools and what is taught in school varies wildly throughout the world, so the prompt was technically impossible.
But after reading through thousands of comments from people demanding it exists, I felt compelled to figure out a workaround especially after seeing "I know I'm living life with an outdated operating system". I didn't want myself or anybody else to have that. Just reading the comments on the post made me realize how much of life I don't know, including all the outdated info and myths I believed!
So I found the workarounds: I'd classify the facts by DECADE rather than year to give wiggle room for when each fact's lifespan started fading. I'd also give users easy access to ALL the facts on the site just in case the decade discovery method wasn't inclusive enough of your reality. Besides school facts, I also added old wives' tales and media misinformation (commonly spread scientific and historical claims only, not things people are doing). I also added special pages dedicated to countries that no longer exist or slang that evolved: https://theretrocodex.com/evolvi...
To add even more factual precision and inclusivity, I decided to upgrade it from a simple site to an entire community platform: instead of just me listing facts on pages only I can modify, users will be submitting facts with the country/state and what decade they learned them. To further account for the regional variation pain point from the social media comments, users have the option to select and display your country/state so other people who grew up where you did can follow you and learn what your part of the world got wrong.
I hope you enjoy it and I look forward to learning what you're unlearning! What fact on the site surprised you most?