Zeta (제타) by Scatter Lab vs Wrtn (뤼튼)
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
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Wrtn (뤼튼)
Korea's free AI app, from the company behind Crack and Kyarapu
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| RECATOOLS Score | 6 / 10 | 6.1 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Freemium | Freemium |
| Free tier | Free, unlimited character chat with ads on the default model; premium koji and luca models and Snapshot cost Pieces | Free sign-up to the Wrtn app (chat, writing tools, YouTube summaries, live recording); Crack sells crackers priced only in-app |
| Paid from | zeta pass ₩14,900 / US$14.99 / ¥1,650 a month (App Store); Pieces sold separately | — |
| Has API | ✗ | ✗ |
| Open source | ✗ | ✗ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2024 | 2022 |
| Maker | Scatter Lab, Inc. | Wrtn Technologies (뤼튼테크놀로지스) |
| Verdict | Zeta has real scale: the Korea Herald put it at 1.5 million monthly users in January 2026, over 90% in their teens or twenties, and since May 2026 it is on app stores worldwide. The risks are content and intellectual pro... |
For Korean speakers, Wrtn remains an easy free entry point to a current chat model with writing, summary and recording tools, and no published subscription price to weigh. The company behind it is now an entertainment bu... |
| Full review → | Directory listing → |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.