439*hz (@kay440) is a Japan-based music producer posting Shorts that rearrange J-pop songs, plus original vocaloid and pop releases with guest vocalists. The channel has about 27,000 subscribers and a median of 12,000 views per video, with roughly 26 uploads a year. A sponsored video is estimated at $150 to $250. Original songs link to streaming releases.
A Japanese music producer with a loyal Shorts audience and a hit video above 280,000 views
- Median of about 12,000 views; "かわいい曲の作り方" reached about 280,000 and an arrangement clip about 146,000.
- 26 uploads in the past year, mostly under 45 seconds, though only one in the last 90 days.
- Like rate near 3.5 percent, higher than most channels of this size.
Brand fit report
Content
- Formats
- short arrangement clips, music videos, long background music mixes
- Tone
- calm, melodic
- Language
- Japanese
- On camera
- No, voiceover and b-roll
- Production
- Clean, lightly edited
- Typical length
- under 60 seconds for Shorts, 2 to 4 minutes for music videos
Audience
Commercial
- Brands seen
- None yet
- Categories promoted
- None yet
- Affiliate links
- No
No sponsorship disclosures found in the last 50 videos
Suitability GARM Brand Safety Floor + Suitability
Family friendly
Videos are instrumental arrangements and original songs; descriptions about love and loss, such as "狂気 / FOILE", are lyrical themes only.
We classify content, never people. No age, gender, ethnicity, religion or political views are inferred about the creator. Audience figures are estimates unless marked verified. Creators can correct anything on their profile.
Platforms
Benchmark score: 56 / 100
Public rule, same for everyone. How it works.
Recent videos
▶四時にはね。/ Four o'clock（ft. AKARIあかリ & ナースロボ_タイプT） · 17k views
▶水泡花火 / mizuawa hanabi feat. AKARIあかリ · 50k views
▶ZUTOMAYO「秒針を噛む」をアレンジしてみた · 7.6k viewsLast three uploads, latest 16 days ago.
美しい音楽を送りたい
About 439*hz
439*hz is a music producer from Japan who posts Shorts of rearranged J-pop songs and releases original tracks, often with vocalist AKARI or Hatsune Miku. The channel has about 27,000 subscribers and a median of roughly 12,000 views per video. About 80 percent of recent uploads are Shorts under a minute, mixed with music videos of two to four minutes and an hour-long background music mix.
Audience figures are estimates, not platform data: most viewers are likely Japanese-speaking music fans, with a smaller international group. Original songs link to streaming and download pages in video descriptions. No sponsorship disclosures were found in recent videos.
The estimated rate for a sponsored video is $150 to $250, which is the minimum range and reflects the Shorts-heavy catalog at $4 to $8 per 1,000 median views. The effective CPM is far below the $10 to $30 typical for paid ads. Music tools, streaming services and Japan-focused app or entertainment brands could book a native mention.
Written from 439*hz's public YouTube profile, platform data and web mentions. Numbers updated 2026-10-19. 439*hz can edit or remove this page at any time.
Questions about 439*hz
How much does 439*hz charge for a sponsored video?
Starbooked estimates $150 to $250 per sponsored video. Most uploads are Shorts, so the rule of $4 to $8 per 1,000 median views of about 12,000 falls below the minimum range.
What does 439*hz post about on YouTube?
439*hz posts short arrangements of Japanese pop songs, original vocaloid and pop music videos with guest vocalists, and occasional long background music mixes for studying or sleeping.
How do I contact 439*hz for a brand deal?
No email is listed on the channel. Contact details, where available, unlock on Starbooked for $0.80, and boosted creators can be booked through Starbooked.
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