01
Web · Collaborative soundboard
Encore
Create a room, invite people by link and build scenes from YouTube and SoundCloud media. Whatever is playing stays in sync for everyone. Made for streamers and tabletop RPG groups.
© 2026 Leonardo Aleixo Manhães
Brass Leo
From tape calculators to make-believe stores.
Independent apps, websites and tools by Leonardo Aleixo Manhães. Every project has its own page, with everything it does.
See the productsProducts
02
Web · Pretend store
SiegBrowse
A pretend shopping site: you fill a cart, act like you are buying and pay nothing. It has quests, levels and rewards, with a theme inspired by Dark Souls that still welcomes people who never played it.
More tools
MiniTape Pro
It records every calculation on a tape, like a desktop adding machine, and prints the receipt straight to a thermal printer. Very complete, and still minimalist.
About me
The person behind the lion.
I am Leonardo Aleixo Manhães, a Cyber Defense graduate from Fatec Jundiaí, in Brazil. I have been coding since I was 16 and, since my very first course, I have been known for robust, organized code. Brass Leo is where I turn real problems into tools: every project here started as a need of my own and was built to actually work, from MiniTape's printed receipts to Encore keeping a whole RPG table in sync.
At Fatec, I started as an intern and left as a standout on the IT team. I built full network monitoring in Grafana, with a campus map showing every network point in real time, and found a loop that was sending back hundreds of thousands of packets and had been there for over a year. Together with the team, we fixed it, cleared old bottlenecks and organized the network.
Security, organization and attention to detail go into everything I make. From here on, I want to build more tools and make landing pages with that same care.
And the name? Leo also means lion, and brass is the wealthier cousin of bronze, my favorite metal.