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Kaesu is an AI comment-reply Chrome extension for YouTube creators. It appears in the comment reply interface in YouTube Studio and on YouTube video pages. Its core goal is to turn the task of replying to large volumes of comments from fully manual writing into “AI drafts first, then the creator reviews, edits, and sends.” The company highlights that around 100 comments can be handled in about 10 minutes and that 100+ channels have already adopted it, but those efficiency claims still need to be judged in light of each channel’s comment complexity.
Kaesu’s key capability is that its AI automatically reads the video transcript and the comment content, then generates natural, non-template-style reply drafts. It also offers 6 tone options, such as friendly, polite, and humorous. It is not an automated comment bot: the terms of service clearly state that it only generates draft replies and does not publish them automatically. The user is responsible for final confirmation, editing, and sending. This reduces the risk of accidental posting, but it also means human review is still required.
The free plan can generate 5 reply drafts per day. Kaesu Pro costs 980 JPY per month (tax included), offers unlimited generation, supports Stripe credit card payments, renews automatically every month, can be canceled at any time, and is generally non-refundable. The product is delivered as a Chrome extension and is used inside YouTube Studio after installation. The company emphasizes that no complicated AI setup or prompting is required. The drawbacks are that it cannot be used on mobile, and there does not appear to be a public API or broader platform integrations.
Its main advantage is its highly focused use case: it is built specifically to solve the time cost of replying to all YouTube comments and the problem of outsourced operators not understanding the video context. Because it incorporates the video transcript, its replies can be more content-aware than ordinary fixed templates. The price is also friendly for channels with high comment volume. The limitations are that details about the underlying model, Chinese-language capability, third-party AI calls, and data retention have not been disclosed. The terms also state that the accuracy and appropriateness of generated content are not guaranteed, and the provider does not take responsibility if a reply leads to YouTube penalties.
Kaesu is suitable for YouTube creators with a high volume of comments who value fan engagement and want to preserve their own tone, especially creators publishing Japanese-language content. For Chinese-language channels, the available materials do not prove the quality of its Chinese replies. Access from mainland China is unknown, and real-world use may also be affected by YouTube, Chrome Web Store, Stripe payments, and the local network environment. Alternatives include manually generating replies with ChatGPT, Gemini, or Claude, as well as tools like vidIQ and TubeBuddy, or outsourcing community operations to human staff.
⚠ 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 kaesu.app official site.
kaesu.app is an Japan AI Apps provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach kaesu.app directly.