Software,
crafted with care.
TenStella is a software product company. We build and operate our own apps — thoughtful subscription products designed for clarity, craft, and long-term usefulness.
Products
What we're building.
Five products, built to respect your time, money, and data. Four are live, and one ships shortly.
Natsuyaru
Summer homework, planned in a snap.
Photograph the summer homework list and get a daily quota table the whole family can see — print it or save it as an image. A free web app, no account needed.
Try itKyoyaru
Snap a handout — today's tasks, delivered.
Photograph a school printout and AI drafts the homework, items to bring, and events. Kids see just today's share; parents see the whole family's week.
Try itKururec
Your iPhone, a dash cam for today.
Loop recording that automatically deletes old footage, so storage never runs out. Fully on-device — video never leaves your phone. Built for rental cars and car sharing.
Try itYurumeshi
Snap the plate — calories, drafted.
Photograph a meal and AI drafts the items, portions, calories and macros. Check it, save it, done. No streaks to break, so a missed day costs you nothing.
Try itSora no Oshigoto
Little pilots, airport jobs.
A plane game for little children to play with a parent: fuel the plane, load the bags, fly through the stars and land in a city in Japan. No ads, no purchases, no data collected, and it works offline.
Learn moreHow we build
Principles behind every product.
Product design
Interfaces that feel obvious in hindsight — clean, focused, and built around how people actually work.
Engineering
Fast, accessible, modern stacks behind every product we ship and keep running under real-world load.
Applied AI
Used only where it genuinely beats the simpler option — practical automation, never a buzzword.
Performance
Measurable wins: sub-second loads, lean bundles, and infrastructure that doesn't fight you on a Friday night.
Brand & identity
A coherent visual system that scales across product, site, and story — built to last beyond a redesign cycle.
Long-term stewardship
We build software meant to last and keep operating it well past launch — updates, fixes, and care over time.
Get in touch.
Questions about our products, partnership or press inquiries, or support — we read every message.
[email protected]