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© 2026 Shirokuma
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Shirokuma

I make the outliner Kosshi and Ohaco, which builds 3D shapes out of blocks. I write up what I think about and make here.

Works

  • Kosshi

    Kosshi

    A simple, fast outliner

    Read more on Kosshi→
  • Ohaco

    Ohaco

    Block-based 3D modeling app

    Read more on Ohaco→
  • Shirokuma Shop

    Shirokuma Shop

    3D-printed items, picture books, stickers & more

    Visit the shop→
All works →
  • I dropped the contact form and put up my email

    Jun 13, 2026#Kosshi

    I recently changed how people contact me, from a form to just my email address. It started with a small thing that had been bugging me. People come in through a form, but I reply by email. Once someone writes through the form and we move to email, the next time they want to reach me, they're not sure which one to use. The form again? Or just email me? Eith

    Read more →
  • I started a newsletter for Kosshi

    Jun 7, 2026#Kosshi#Newsletter

    A while back I wrote that feedback for Kosshi had started pouring in over email. That hasn't let up, and I've been living in my inbox ever since. The thing that kept bugging me was simple. I can reply to people one by one, but I had no way to tell everyone using Kosshi, "hey, this is changing." I keep a release-notes page, and I post the occasional "just s

    Read more →
  • Kosshi feedback has been pouring in lately

    May 30, 2026#Kosshi

    Lately, the feedback coming in through Kosshi's contact form has been getting a bit wild. As I mentioned in an earlier post, hardly anyone outside Japan was using Kosshi, so when I put it on Product Hunt my expectations were honestly pretty light, something like "maybe the numbers will tick up a little." Then this week, a longtime overseas outliner user, m

    Read more →
  • Showed a mini Sankome at Design Festa 63

    May 25, 2026#Ohaco#Sankome

    At Design Festa 63 on May 23rd and 24th (a big indie art and craft fair in Tokyo), Naoyoshi let me place a mini Sankome at her booth. It was printed with Ohaco, the 3D builder I'm working on. Most of the character-and-merch side of Shirokuma, including the brand icon itself, has been made by my wife Naoyoshi. Lately she posts the goods-side things on the SH

    Read more →
    Showed a mini Sankome at Design Festa 63
All posts →

Popular posts

  • Generating App Store screenshots in nine languages with Remotion
    #1

    Generating App Store screenshots in nine languages with Remotion

    Kosshi barely got downloaded outside Japan, and when I looked into it, it was hardly showing up in any store at all. So I rebuilt its App Store screenshots, nine languages' worth, from code, with Remotion.

  • Kosshi feedback has been pouring in lately
    #2

    Kosshi feedback has been pouring in lately

    Lately, the feedback coming in through Kosshi's contact form has been getting a bit wild. An overseas blog and a thread on outlinersoftware.com brought in a wave of new users, and it became clear that right now isn't the phase to spread it further, but the phase to fix things.

  • Kosshi took me four years to ship
    #3

    Kosshi took me four years to ship

    The app I quit my job to build sat in my head for four years before I finally shipped it.

  • Adding Japanese to Kosshi turned into nine languages

    Adding Japanese to Kosshi turned into nine languages

    When I added a Japanese UI to my own app, it felt like a more visible bump in daily use than any of the small fixes I'd been making recently. My weakness in English may, oddly enough, have ended up working in my favor.

  • Putting Kosshi on Product Hunt turned out pretty well

    Putting Kosshi on Product Hunt turned out pretty well

    Barely anyone outside Japan was using Kosshi. I put it on Product Hunt as a first step toward reaching beyond Japan, and the response turned out better than I'd expected.

  • The Bear Who Couldn't Make: A Picture Book

    The Bear Who Couldn't Make: A Picture Book

    Naoyoshi and I made a picture book about a bear who couldn't make anything anymore, and what brought him back to making.

Original Goods

Physical goods I make with my wife. Latest on X SHIROKUMA.

  • The Bear Who Couldn't Make (Picture Book)

    The Bear Who Couldn't Make (Picture Book)

    ¥2,500

  • Shirokuma Earphone Holder

    Shirokuma Earphone Holder

    ¥1,000

  • Pukupuku Tiger Keychain

    Pukupuku Tiger Keychain

    ¥1,000

  • Traffic Cone-kun (Red)

    Traffic Cone-kun (Red)

    ¥1,000

  • Black Rabbit Keychain

    Black Rabbit Keychain

    ¥1,000

  • Animal Stickers (Set of 2)

    Animal Stickers (Set of 2)

    ¥500

Shop →

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