Independent Software Studio · Republic of Korea

DoubleHash

DoubleHash is an independent software studio in the Republic of Korea. We design, build and operate our own web services and mobile apps — from the first sketch to the servers they run on.

Web services3 telloo.io · starringkid.com · tierloop.net
Mobile apps5 App Store · Google Play

Products built and run by DoubleHash

Hoppy

Your child's
first app is Hoppy

The first learning app for your child's first phone. No ads, no subscription, no account — the first 3 units of every subject are free.

No ~~ads~~
No ~~subscription~~
Pay once = forever

More about Hoppy →

StarringKid

“That’s me!”

A picture book starring your child

Upload one to three photos and choose between two character drafts. A ten-scene story written for your child’s age is illustrated around them and delivered as a high-resolution 18-page PDF.

Make a book → Available in Korean for now.

Web services

Telloo

telloo.io

Flat price, unlimited customers.

A public feedback board and roadmap on your own subdomain. Customers post and vote without an account; your team pays one flat price.

Live Terms Privacy

TierLoop

tierloop.net

Search it, drop it — the cover follows.

A tier-list maker: search games, anime, music, TV, books and people by name and the cover image comes with them. Every saved list counts as a vote in that topic’s ranking.

Live Android app