The archive · Consumer Apps · Product decision · 2024–2026
Dreamoo's Xiaohongshu bet: viral post validates a dream app, then an exit
Post-2000 founder Sun Donglai proved demand for an AI dream app with one Xiaohongshu post (200k+ views), reached 3,000 users in a month, then sold the company.
Dreamoo
What the business is
Dreamoo is an AI dream journal and social app: users write down dreams, AI turns them into images, users chat with an AI dream interpreter and share dreams to find people who dream the same.
Starting capital：A seed round valuing the company at ¥30 million was reported by The Paper in February 2025; amount not disclosed.
How it started
Sun Donglai, a post-2000 graduate student at USTC based in Hangzhou, got the idea on a walk by West Lake: could AI record his dreams? A friend who kept a long-term dream journal joined him; they wrote a Xiaohongshu post on the spot, and it drew 200k+ views and 5,000 comments in three days. A four-person team (back end, front end, design, marketing) then built the app, which entered App Store public beta around 2025-01-21.
What happened
The app recorded 3,000+ users' dreams in its first month with no ad spend; The Paper reported a seed round at a ¥30 million valuation in February 2025. A Zhejiang University neuroscience PhD joined in late 2024 and the team presented at the UN. By July 2026 coverage the app had stabilized at roughly 4,000 users, many traced to the original Xiaohongshu post.
How it ended up
Dreamoo's company was acquired and founder Sun Donglai moved on to a new startup, Mozao, a lightweight mask that records audio and suppresses sound; by July 2026 its Xiaohongshu concept video had 400k+ views and over 100k reposts, and crowdfunding had opened in China.
Background
Dreamoo is an AI dream journal and social app founded by Sun Donglai (Sidrel), a post-2000 graduate student in Hangzhou. Walking by West Lake, he wondered whether AI could record his dreams; a friend who had kept a dream journal for years joined him, and the two wrote a Xiaohongshu post asking who else recorded dreams. It drew 200k+ views and 5,000 comments in three days, with zero paid promotion.
The comment thread became the product brief: people described writing 800 characters of dreams every morning, and some even serialized their dreams as fiction on novel platforms. A four-person team built the app — text dream entries, AI-generated dream images, an AI interpreter, and sharing that matches people who dream alike — and entered App Store public beta around 2025-01-21. It recorded 3,000+ users' dreams in month one, and The Paper reported a seed round at a ¥30 million valuation in February 2025.
Scale stayed small — about 4,000 stable users by mid-2026, many of them the post's original commenters — yet the company was acquired, and Sun moved to a second Xiaohongshu-native venture, Mozao, a mask that records audio and suppresses sound, whose concept video reached 400k+ views and 100k+ reposts before crowdfunding opened in China.
What has to be true
- The Xiaohongshu post produced unusually specific demand evidence — 800-character daily journalers and public dream fiction — that no survey could fake, de-risking the build.
- Zero-ad cold start turned the validation thread into the first user community, so launch day began with people who already wanted the product.
- The app's niche framing — recording 'the forgotten third of life' and meeting people who share your dreams — gave it a story that traveled beyond the original post.
- Even at small user counts the founder reached seed funding and an acquisition, showing platform-native distribution can substitute for scale in early exits.
What can be applied
A community post can substitute for market research: thousands of unprompted, detailed comments prove demand, and those commenters become the first users of the product they helped design.
Aftermath
As of the July 2026 report, Dreamoo's company had been acquired and the app's ~4,000 users were stable; founder Sun Donglai had launched Mozao, a mask that records the wearer's voice and suppresses ambient sound, built on the same Xiaohongshu playbook: a concept video drew 400k+ views and over 100k reposts, a roughly 1,000-person user community formed, and pre-orders closed across platforms before domestic crowdfunding opened, with the US and Japan next. Whether Mozao converts buzz into a durable hardware business was still unproven at the time of reporting.
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