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Colomo (colomo.dev) is an AI translation web tool with a Korean-language interface. Its core technology is not an in-house model; instead, it calls the Gemini API via Google AI Studio or Vertex AI. It is mainly designed for web novels, fan fiction, and long-form reading: users can enter text or a page URL for translation, it can automatically continue translations when output token limits are reached, and it provides a dedicated reader for certain sites.
On the model side, Colomo supports settings such as temperature, top-P, model type, and reasoning level. In automatic mode, it attempts Gemini 3.0 Flash Preview and 2.5 Flash Preview according to its rules, and supports automatic rotation across multiple API Keys. The product includes a number of engineering optimizations for novel-reading scenarios: 50,000-token segmented translation, caching, downloads, previous/next chapter navigation, original-text comparison, translation notes, system prompts, and A/B replacement rules for fixing character names, tone, and terminology. Supported sites include Hameln, Kakuyomu, Shōsetsuka ni Narō, Pixiv novels, LOFTER, RoyalRoad, AO3, Fanfiction.net, as well as some Chinese novel sites. It also mentions PDF text extraction and SRT subtitle translation.
The site clearly states that there are currently no paid feature plans and no payment methods are provided. However, users must bring their own Google API Key. AI Studio’s default Gemini 3.0 Flash quota allows up to 20 requests per day, and long texts or resumed translations after interruptions may consume multiple requests. Google/Gemini subscriptions are separate from the API, and advanced API usage is billed by consumption. Vertex AI is supported, but the documentation notes that it is generally worse than AI Studio in terms of caching, pricing, and performance, and typically requires a Google project with billing information attached.
Its advantages are a free tool layer, a complete novel-reading workflow, less copy-and-paste work, and the ability to improve consistency through prompts and terminology rules. The downsides are that initial API Key setup has a relatively high barrier, and models outside Google are not currently supported. Ordinary web pages that depend on cookies or JavaScript loading are still not handled perfectly; the JavaScript execution option is also marked as a security risk and is not guaranteed to work. On privacy, the documentation does not provide a complete policy; it only confirms the existence of caching, browser URL access records, and a “do not save settings” option.
Colomo is better suited to individual users who are willing to provide their own Gemini API and frequently read Japanese, English, Korean, or Chinese web novels and fan fiction. The documentation does not state how accessible it is from mainland China. At the same time, Google AI Studio, Vertex AI, and the Gemini API may face practical obstacles in China in terms of network access and payment. Alternatives to consider include DeepL, Google Translate, Immersive Translate, or self-hosted LLM-based translation.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on colomo.dev official site.
colomo.dev is an South Korea AI Apps provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach colomo.dev directly.