Wrtn (뤼튼)

At a glance

Wrtn (뤼튼) is a Korean AI service made by Wrtn Technologies that bundles overseas models such as GPT, Claude and Gemini so you can use chat, search, writing and image generation for free. It suits students and office workers who want to try the latest AI without a separate subscription, and people who need a tool for writing blog posts and reports. The company's main revenue comes from separate apps, the character chat app 'Crack' and 'OOC' for North America, and the main Wrtn service has stayed free since it went fully free in December 2023.

Full model list

Rather than having users pick a model each time, Wrtn automatically assigns the model that fits the question, and it is hard to see from public screens which models are actually assigned now. Below are the models named in the official app descriptions (App Store/Google Play) and official announcements. The app descriptions still use old model names, so this may differ from the actual current setup.

• Wrtn's KakaoTalk chatbot once offered DeepSeek R1 for free on its own servers (current availability unconfirmed).
• For businesses, it runs 'Wrtn AX', a B2B service (LLM router) that bundles multiple LLMs.

Summary by plan

• The character chat app 'Crack' runs as a separate app with separate billing (Super Chat, passes and so on) and is outside the scope of this page.

Which plan for whom

• Free (default): Students and office workers who want to write assignments, reports and blog posts with latest-level AI without paying ChatGPT/Claude subscription fees. The Korean UI and purpose-built tools make it easy even for first-time AI users. However, it is hard to choose which model answers, so if you need a specific model's quality, subscribing to the original service is better.
• Buying credits/keys: Only needed by people who often use extras such as memes and images, so top up a small amount. They are not needed for the core chat features.
• Wrtn Speaking: Scheduled to end, so we do not recommend new use.
• Wrtn AX: Companies that want to manage models from several companies at once and push in-house AI transformation.

Notes

• Information checked: 2026-10-12
• Sources:
  • Google Play – Wrtn - AI for everyday use (updated 2026-07-29)
  • App Store – Wrtn (in-app purchase items)
  • Wrtn Technologies – Announcement of free, unlimited GPT-5
  • AI Times – Wrtn GPT-5 free/unlimited
  • Digital Marketer – How to use Wrtn and free scope (edited 2026-10-04)
  • ZDNet Korea – Articles on Wrtn (2026)
• What could not be confirmed: We could not access the official site wrtn.ai to check the current model list directly. The model names in the app description (GPT-4o/Claude 3.7/Gemini 2.5 and others) are likely outdated labels.