Treestcorp

About Treestcorp

Treestcorp is a software company based in Yongin, Republic of Korea, founded on January 3, 2024. Our main field is education, and our main product is Nudgy, an iOS app for practicing English conversation by writing. We also run P256, a web service that maps a crew's personality types, and we are developing a mobile game.

2 years 9 months in business

We opened for business on January 3, 2024. As of October 2026, the company is less than 5 years old.

Company information

Company name
Treestcorp (registered name: Treest (트리스트))
Representative
Hyeonsu Lee
Founded
January 3, 2024 (business start date on the registration certificate)
Time in business
2 years 9 months as of October 2026 (less than 5 years)
Business registration no.
302-21-13750 (National Tax Service, Republic of Korea; general taxpayer)
Address
703-A1004, 7F, 9 Gangnamseo-ro, Giheung-gu, Yongin-si, Gyeonggi-do, Republic of Korea
Business type and items
Information and communication; professional, scientific and technical services / Application software development and supply; advertising agency
Main field
Education (English learning app Nudgy)
Products
Nudgy (iOS app, launched February 28, 2026), P256 (web service, 256personalities.com)
In development
Idle growth game (planned for mobile, title not decided)
Email
admin@treestcorp.com
Website
treestcorp.com
See the registration certificate and verification records

Business areas

Our main field is education. We also run the web service P256, and we are developing a mobile game as a new business.

Nudgy app icon

Education: Nudgy

Main field, iOS app

Nudgy (App Store name: "Nudgy: 영어회화 영작연습") is an English conversation app for Korean, Japanese, and Traditional Chinese speakers. Learners read a sentence in their native language, write it in English themselves, and ask an AI tutor when they get stuck. The course covers only the grammar needed for conversation, step by step from "be" verbs to the present perfect, and FSRS spaced repetition decides when each sentence comes back for review.

We launched Nudgy on the App Store in Korea, Japan, and Taiwan on February 28, 2026. Since then we have released 8 updates, up to version 1.0.11 on September 27, 2026. They added speaking practice with real-time correction (1.0.7), expression pattern lessons (1.0.9), and dark mode (1.0.11), among other changes. Nudgy is not available on the US App Store.

The App Store lists the seller as Hyeonsu Lee because the app is distributed through the representative's personal Apple developer account. The app's support page and privacy policy show the company's registered name, Treest.

More about Nudgy · View on the App Store

Web service: P256

P256 (256personalities.com) collects the personality types of a crew, such as friends, coworkers, or a fan group, and shows them as a relationship map. It is made for fun and has no connection to any official personality test.

We registered the domain on November 30, 2024 and started development in December 2024. Its privacy policy, effective May 8, 2026, names Treestcorp as the operator and support@treestcorp.com as the contact.

Game (in development)

As a new business, we are developing an idle growth game for mobile. The title, release date, and launch regions have not been decided yet. Details are on the Games page.

How we build

We use Claude Code to build our products and to create learning content. For Nudgy, we generate expression explanations, per-sentence FAQs, usage guides, and pattern sentences with Claude, review them, and provide them in Korean, Japanese, and Traditional Chinese.

History

Only events with confirmed dates are listed. Nudgy entries match its App Store version history, and the full update history is on the Verification page.

  1. Opened for business (founded)

    The business start date on our registration certificate.

  2. Registered treestcorp.com

    One day after founding. The registration date is shown in the public RDAP record.

  3. Registered 256personalities.com

    The domain for P256.

  4. Started developing P256

    A web service that maps a crew's personality types

  5. Launched Nudgy

    App Store in Korea, Japan, and Taiwan, version 1.0.1

  6. Nudgy 1.0.7: speaking practice and real-time correction

    Added practice for speaking English sentences, with real-time correction.

  7. Nudgy 1.0.9: expression lessons

    Added expression (pattern) lessons and a mascot.

  8. Nudgy 1.0.11

    Added typing answers with the keyboard, dark mode, and choosing which sentences to review.

  9. NowDeveloping an idle growth game

    New business, planned for mobile