Lumen Tool is a free 3D portrait lighting simulator that runs entirely in your browser. Most alternatives are either expensive desktop software or outdated browser tools that cycle through pre-rendered photos. Lumen renders shadows in real time using Three.js, loads in under a second, and requires no install or account. It's a single HTML file under 1MB. Move a light, watch the shadows shift live. That's it.
Hey, I'm Franck - the person behind this tool. I built Lumen Tool because I kept wishing something like this existed before a shoot. Not another full studio simulation suite, just something quick and visual to figure out where the light goes before you commit to a setup.
It's been a side project for a while now, built in between other work. Happy with where it's at currently!
If you shoot or paint portraits or film talking-head stuff, I'd love to know what's missing for you. That's genuinely the most useful feedback I can get right now.
Cheers!
About Lumen Tool on Product Hunt
“A 3D portrait lighting simulator”
Lumen Tool launched on Product Hunt on April 28th, 2026 and earned 64 upvotes and 1 comments, placing #69 on the daily leaderboard. Lumen Tool is a free 3D portrait lighting simulator that runs entirely in your browser. Most alternatives are either expensive desktop software or outdated browser tools that cycle through pre-rendered photos. Lumen renders shadows in real time using Three.js, loads in under a second, and requires no install or account. It's a single HTML file under 1MB. Move a light, watch the shadows shift live. That's it.
On the analytics side, Lumen Tool competes within Design Tools, Art and Photography — topics that collectively have 422.6k followers on Product Hunt. The dashboard above tracks how Lumen Tool performed against the three products that launched closest to it on the same day.
Who hunted Lumen Tool?
Lumen Tool was hunted by Franck. 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.
For a complete overview of Lumen Tool including community comment highlights and product details, visit the product overview.
Franck