Independent web & app studio

Apps made by
one person.

Digital invitations for Latin America, a budget and shopping-list app, Korean exam prep and a one-thumb game.

See the apps About the studio

The apps

invitoo, Haulo and Practice TOPIK are out now. Skewer Snap is on Android.

 · Out now

invitoo

Digital invitations for Latin America, made in minutes and shared with one link.

  • Designs. For weddings, quinceañeras, birthdays and other celebrations.
  • One link. You share it on WhatsApp.
  • RSVPs and a shared album. Guests confirm, and their photos gather in one place.
Open invitoo Spanish · English · Portuguese
 · Out now

Haulo

Plan it. Haul it. Track it.

A budget and shopping-list app for trips and daily life.

  • Budgets. Set them per trip or per month, and spending updates in real time.
  • Currency conversion. Rates are live, so you don’t have to do the math abroad.
  • AI Scan. Take a photo of a price tag or receipt and the items go into your list.
App Store Google Play Open Haulo web Free, with an optional Pro upgrade
 · Out now

Practice TOPIK

Exam dates, test centers and practice for the TOPIK Korean-language test.

  • Dates. Registration windows by country, shown in your local time and Korea’s.
  • Test centers. By country, with address, fee and directions.
  • Practice. Original drills and full mock exams for levels 1–6, plus a level calculator that works offline.
Open Practice TOPIK Free to start · Spanish, English, Portuguese, Hindi
Practice TOPIK on a phone, Practice by level: original drills from level 1 to 6, Level 1 (TOPIK I, Beginner) with a grid of 20 numbered question sets, the first three open and the rest locked, and the Full level listening and reading sets below.
 · Out now on Android

Skewer Snap

Tap at the right moment.

A quick one-thumb arcade game. Snap the falling ingredients onto your skewer, in the right order.

  • One tap. Time it right and the ingredient snaps onto the skewer.
  • Match the target. Build the skewer shown in the corner. A wrong ingredient ends the run.
  • Levels. New ingredients and a faster hand as you go. From level 4, a missed tap costs a heart.
Google Play About Skewer Snap Free with ads · English and Korean
Skewer Snap’s title screen: a tall skewer stacked with a beef cube, green pepper, tomato slice, sausage, cheese and a mushroom, with the game’s name below.
Skewer Snap gameplay at level 5: a hand holds a skewer stacked with tomatoes, a green pepper and a sausage, the target skewer is in the top-right corner, two of three hearts are left, and a SUCCESS! banner is showing.

I make these apps alone, in South Korea.

I started building on May 18, 2026. Here’s why each app exists.

Haulo. I wanted to spend less, but even when I set a limit for the supermarket or a trip, I kept going over it. Abroad I got tired of converting every price into won. I first planned Haulo about three years ago.

invitoo. Korea already has plenty of companies that make mobile wedding invitations. For Spanish speakers I couldn’t find a good one. And weddings are only part of it: there are family get-togethers, baby showers, gender reveals. I figured there would be demand, so I built it.

Practice TOPIK. TOPIK is the Test of Proficiency in Korean, and a lot of people take it every year. I looked for ways to prepare in Spanish and didn’t find many, so I made one.

Skewer Snap. I never meant to make a game. I just wanted the simple games I played as a kid, and games today have too much going on. So I made one where you can switch your brain off. While I was building it, I kept playing it.

I don’t make gambling-style apps, or anything that could become a problem for society. I ask for as little personal information as possible and do what I can to keep it safe. Haulo, for example, works without an account, and in guest mode your data stays on your phone.

cocosharon

Common questions

What is invitoo?

invitoo makes digital invitations for weddings, quinceañeras, birthdays and other celebrations across Latin America. You build one in minutes and share a single link on WhatsApp. Guests confirm from that link, and the photos they take gather in a shared album. It’s live at invitoo.app.

What languages is invitoo in?

Spanish, English and Portuguese. invitoo is built for Latin America.

Do my guests need to install anything?

No. You share one link and it opens in the browser. Guests don’t download or sign up for anything.

Is Haulo out?

Yes. Haulo is out on the App Store and Google Play.

Is Haulo free?

Yes. The core app is free, supported by ads. An optional Pro subscription unlocks extra features, billed through your App Store or Google Play account and cancellable anytime in your store settings.

Do I need an account to use Haulo?

No. You can use Haulo as a guest, and everything stays on your device. Sign in with Google, Apple, Facebook, or Kakao only if you want your data synced across devices.

What happens to the photos Haulo scans?

AI Scan photos are processed just long enough to read item names and prices into your list. They’re handled transiently and never used to identify you. Details are in Haulo’s Privacy Policy.

What is Practice TOPIK?

Practice TOPIK is for people preparing for the TOPIK, the Test of Proficiency in Korean. It tracks exam dates and registration windows, lists test centers and has practice by level, in Spanish, English, Portuguese and Hindi. Dates, test centers and the level calculator are free; the full practice library is part of an optional paid plan. It’s live at practicetopik.com. It’s an independent service, not affiliated with NIIED or topik.go.kr, so always confirm a date on the official site before you register.

Can I suggest an idea, or work with you?

Yes. You can send questions, app ideas or partnership proposals. Email me.

Email me

For questions, app ideas, partnerships or support.

contacto@cocosharon.com