Dev tools
ionoflux-npm
IonoFlux is a free, web-based platform designed for amateur radio operators, researchers, and anyone interested in HF radio propagation and space weather.
@hongjunna1github.com
Where side projects come out to play.
Built something just for fun? Give it a free subdomain, plug in the server you already run, and let everyone in the park enjoy it.
DomainClaim it
Your addressmy-project.sideplay.dev
Free — two subdomains per account, and you can ask for more. Availability is checked when you submit.
New accounts are reviewed by a human during the beta — usually within a day.
- 2 each, ask for more
- Free
- 2 each, ask for more
- on by default
- HTTPS
- on by default
- quick and easy to launch
- 3 steps
- quick and easy to launch
SideplayIdeas meet, bigger possibilities grow.
Fresh from the playground
Rides that just opened
APIs
railnow-api
Official documentation, OpenAPI specification, and integration examples for RailNow — South Korea's subway and railway real-time data API.
@hongjunna1railnow.runvia.app
How to get in
From localhost to opening day in three hops.
- 1
Grab your ticket
Sign in with GitHub, no new password. We say hi to every new visitor by hand to keep the playground friendly.
- 2
Set up your project
Pick a name and a domain, then tell us your server's public IP or hostname and port. We'll guide visitors straight to it.
- 3
Open the gates
Once approved, your address goes live on its own. Add it to the gallery so everyone can enjoy what you made.
What's in the park
We handle the boring bits. You play.
A memorable address
you.sideplay.dev or you.runvia.app instead of an IP and a port nobody remembers.
HTTPS for visitors
Visitors always arrive over HTTPS. Your server can speak HTTPS or HTTP behind us.
Web, APIs and WebSockets
Anything that speaks HTTP works: sites, REST APIs, dashboards, real-time apps.
A gallery to be found
List your project next to other makers' work. Feedback starts with being seen.
Got an idea you can't stop tinkering with?
Bring it to the playground. Getting in takes about a minute.