Black Cat Notes

I’m Kuroneko — building in public. After years working with Japanese companies across manufacturing and IVD for the China market, I pivoted into AI and indie making to ship practical, calm software.

Here I share short takes on AI/product, notes from hands‑on work, and experiments in AI productization, iOS apps & small games, Rust tools, and Python data plumbing. Learn more on my About page.

On the side, I run a visual branding experiment — anime & aesthetic illustration curated at art.kuroneko-cmd.dev.

Recent Posts

• SentenceDeck 2.0: Turn a Sentence into a Conversation

  7 Oct, 2026

  SentenceDeck 2.0 adds Scene Dialogues — short practice conversations for 30 everyday scenes at A2, B1, or B2, with a partner voice and a stamp for every finished scene — plus custom scenes, a hand-drawn sketchbook redesign, and Read Along for your own text.

• Simple Warm Reminder 3.3: Set Up a Parent's Reminders From Your Own Phone

  1 Oct, 2026

  Simple Warm Reminder 3.3 adds Set Up for Family: prepare reminders on your iPhone and let a parent import them with one QR code. Plus Lock Screen actions, a clearer dark mode, and a download about half the size.

• DevDay Showed Every Move OpenAI Has. Opus 5.5 Needed One.

  30 Sep, 2026

  OpenAI's DevDay 2026 shipped GPT-6.1 Sol, dots, Ultrafast, and a Pro 500 plan. For existing subscribers only two of them matter, and none of it makes up for the usage that was cut in half.

• TravelBrain 2.0: Smart Import, Native iPad, and Dark Mode

  Updated: 30 Sep, 2026

  TravelBrain 2.0 adds private on-device Smart Import, a review-before-save workflow, a native adaptive iPad layout, and System, Light, and Dark appearances.