*This is the third instalment of Swipe, a column that takes a close look at AI apps and services making waves in South Korea. This edition examines Crak, Wrtn's character-chat service — flagged in our previous piece as the company's true commercial engine.*
What it is
Crak is an AI character-chat service operated by Wrtn Technologies. It began life as a feature embedded within Wrtn's main app before being spun out as a standalone product on 3rd April 2025. On its first day, it reached number one in the entertainment category on both the iOS App Store and Google Play in South Korea. As noted in our previous piece, Crak accounts for the lion's share of Wrtn's actual revenue.
How it works
Crak is built on a simple but powerful principle: every user is a potential creator. Characters produced by Wrtn itself make up only a small fraction of the catalogue; the vast majority are designed and configured by users. The boundary between creator and consumer is effectively non-existent — anyone who starts out simply chatting can, at any point, build their own character. The roster ranges from an elven queen named Maeve to a worldly-wise senior giving relationship advice, each with their own backstory and personality. Users immerse themselves in everything from fantasy role-playing games to school-life simulations through conversational exchanges with these characters.
On the technical side, the standout feature is what Wrtn calls "advanced summarisation memory." Even in extended conversations, the system retains context, aiming to make interactions feel less like isolated exchanges and more like an evolving relationship. The app also runs engagement events that reward users based on how often they chat and which characters they use, while premium options — including a "super chat" function — are available through in-app purchases.
Growth and expansion
The numbers are striking. According to an analysis of SimilarWeb data by Korean venture research firm The VC, Crak's monthly active users (MAU) on the web stood at 1,925,655 in April last year, representing 36.5% of Wrtn's total web MAU of 5,274,256. Within a month of its standalone launch, Crak had reached third place by MAU among all South Korean start-up services.
International expansion is moving quickly. In Japan, a localised version launched on 10th June 2025 under the name Kyarapu (キャラぷ), with a distinct in-app currency called "Gold" (1 Gold = ¥1) and a different selection of chat types and underlying models. On 15th April this year, the service entered English-speaking markets, positioning itself around free-form conversations with anime-style characters. Na Bong-min, Wrtn's head of content partnerships, has said Crak aspires to go beyond character chat to define a new mode of content consumption, and to establish itself as a global leader in AI-driven entertainment originating from South Korea.
Strengths and limitations
Crak's principal strength is its open architecture: rather than offering a fixed menu of characters to consume, it cultivates an ecosystem in which users create and share their own characters and narratives. This largely insulates the platform from content exhaustion. The quality of Korean-language conversation, competitive pricing, and a clean user interface are also frequently cited advantages over rival services.
There are constraints, however. Compliance with app-store content guidelines means that explicit material is restricted, and in certain situations the system defaults to evasive or formulaic responses. Users who wish to move between Crak and its Japanese counterpart, Kyarapu, also find cross-access limited — an inconvenience that reflects the fragmented, market-by-market structure of the service's global rollout.
Assessment
Crak is the hidden main act behind Wrtn's productivity-tool branding. Its user-generated ecosystem stands out as one of the more distinctive success stories in South Korean AI, and its international roll-out has been swift. Yet there is a telling irony here: the most commercially successful South Korean AI consumer service is not a workplace productivity tool but a platform for chatting with fictional characters. That fact says something revealing about where, in practice, Korean consumers are actually willing to open their wallets for AI.
★★★★☆ (3.5/5.0)
In a line "You assumed it was the supporting act. It turns out Crak was the star all along."