r/Lightbulb is a subreddit with 117k members. The most common kinds of discussions are ideas and solution requests, and the community frequently discusses idea, app, ai, movie, and technology.
A community for sharing ideas, inventions, and plans.
Popular Themes in r/Lightbulb
#1
Ideas
: "YouTube should provide an opposite to the subscribe button"
104 posts
#2
Solution Requests
: "A stationary bike I can ride at night to charge up my e-bike so I can ride to work in the morning and not arrive to work sweaty, but still know I put in the effort."
17 posts
#3
Self-Promotion
: "I’m building a free app for car spotters - would love your feedback"
5 posts
#4
Advice Requests
: "Bra recommendations"
3 posts
#5
Pain & Anger
: "Realizing that saying “No” is a superpower changed how I handle stress."
1 post
#6
Opportunities
: "Improvement to the 12 key layout for Japanese text input on phones"
1 post
Popular Topics in r/Lightbulb
#1
Idea
: "Idea: Airports should have prominent signs saying “Congratulations on surviving your drive to the airport. Welcome to a safer form of transportation.”"
85 posts
#2
App
: "A photo App that allows you to take pictures while displaying a translucent overlay of another photo."
25 posts
#3
Ai
17 posts
#4
Movie
: "Horror Movie idea: Jury haunted by victims… who are trying to help the killer."
17 posts
#5
Technology
: "Idea: Airports should have prominent signs saying “Congratulations on surviving your drive to the airport. Welcome to a safer form of transportation.”"
9 posts
#6
Game
: "A Gacha-esque Game that donates a percentage of money made to a (legit, not made up for this) charity thematic to what-it-has-of-a-story"
7 posts
#7
Lightbulb
: "What’s a recent aha “Lightbulb” moment you’ve recently had?"
6 posts
#8
Search
5 posts
#9
Food
: "Tired of wasting good Food, so I built this app!"
5 posts
#10
Social
: "A Social app by the users for the users"
5 posts
Member Growth in r/Lightbulb
Yearly
+5k members(4.2%)
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About
GummySearch helps people research Reddit communities by organizing activity, growth, themes, and post-level signals into one place.
This page gives a focused view of r/Lightbulb, including current member size, discussion patterns, product reviews, and related communities to explore.
This data is synced periodically so insights stay current and useful for ongoing research.
Last updated: July 3, 2026