DOCUMENTATION / START HERE
Useful things,
explained.
This is my manual for zentr.dev: what I built, how you use it, and why I made some of the slightly-chaotic decisions behind the collection.
PROJECT INDEX
Pick the thing you need.
Surveys
Account-backed surveys with a familiar form editor, identified responses, and $5 one-time payments for each extra week.
surveys.zentr.devMembership
My one-time Zentr+ membership and separate feature unlocks—never another monthly subscription.
members.zentr.devSchool
The school projects, experiments, and class work I wanted to keep in one place.
school.zentr.devFun
My collection of 60 classic Flash games, without third-party ads and with free account saves.
fun.zentr.devTools
Seven browser-first tools I made for turning messy digital stuff into something useful.
tools.zentr.devStatus
My public view of service health, latency, uptime, and recent incidents.
status.zentr.devDrop
My free, browser-based encrypted sharing tool: up to 10 GiB, no account or ads, and 30-minute links.
drop.zentr.devConvert
My one-input converter: it detects the format, shows the useful options, and stays local when it can.
convert.zentr.devAccount
The one account I use across participating zentr.dev projects, with OAuth 2.1-style PKCE handoffs.
auth.zentr.devCaution SMP
My YouTube-inspired home for Caution SMP videos, delivered from private project infrastructure.
caution.zentr.devTHE SHORT VERSION
What is Zentr?
Zentr is where I put the things I build: practical browser tools, interactive experiments, temporary sharing, conversion utilities, shared identity, school projects, a self-hosted Minecraft archive, and the status page that admits when I broke any of them.
THE POINT
I’m not trying to turn every useful button into a subscription. My goal is simpler: spend as little as possible, build something genuinely useful, and keep it pleasant to use.