Affordable, high-quality
software built for you.
Not generic packages — systems built around the way you work. With AI-driven development, we take you from development and data migration to automation, quickly and affordably.
Create an invoice Free, no sign-upSound familiar?
Four common barriers to adopting a system — and how Onesoft answers them.
“Systems are expensive and slow to build”
Quoted millions of yen and six months, so the project was shelved.
“Stuck with Excel and paper”
Past data is scattered and can’t be moved into a new system.
“Not enough hands”
Data entry, copying, tallying and inquiries eat up the day.
“Off-the-shelf software doesn’t fit”
Staff don’t use it, and Excel ends up running in parallel.
Just tell us what’s bothering you. No feature lists or specifications required.
What we offer
Does your website’s URL still start with “http://”?
Since October 2026, Google Chrome warns visitors before opening sites that use “http://”. Unencrypted connections also put passwords and personal information at risk of being intercepted.
- A warning screen before visitors see your site
- Passwords and personal data exposed
- Pages can be tampered with
- Lower search visibility
Data breaches keep making the news. Is your site protected?
Leaks from unauthorized access and defaced websites are reported almost every month. Most are caused not by sophisticated attacks, but by systems left without updates.
Sources: Patchstack “State of WordPress Security in 2026” (Feb 2026); W3Techs (as of Sept 2026)
Onesoft reduces the points of attack in the architecture itself — and the people who build your system keep looking after it.
Our approach to securityWhy Onesoft
Not off-the-shelf products, but systems built around your business — at a reasonable cost.
Built for your business
Instead of bending your work to a package, we design around your procedures, forms and terminology.
Fast and affordable with AI
AI-driven development takes a fraction of the usual time and budget. Start with the features you need and grow step by step.
Keep your data and workflows
We migrate data from Excel, paper and legacy systems and automate manual entry and reporting.
Local, all the way to operations
In-person support across Karatsu and Saga. The same person stays with you for improvements and maintenance after launch.
Nuxt, Next.js, Vue, React, TypeScript, Vercel, AWS, Firebase, MySQL, PWA, MapLibre, GTFS, Gemini, Claude, OpenCV, Stripe, Bun, Node.js
Featured works
Not just what we built, but what changed for our clients.
Saga Kobo Online Shop
- Challenge
- Needed an online store they could run in-house — products, orders and shipping
- Solution
- Product management, CMS, shipping slips and external payments. Even the color scheme is editable from the admin panel
- Outcome
- Day-to-day store operations handled in-house, without outsourcing
Digital Stamp Rally
- Challenge
- Wanted visitors to tour local attractions, but app distribution was a heavy lift
- Solution
- Visits recorded via GPS or QR. Guides, stamps and prize entries in one flow
- Outcome
- Works for limited-time and permanent rallies. Visit data feeds the next campaign
Sukuspo
- Challenge
- Launch a new service connecting school clubs with outside coaches — from scratch
- Solution
- Designed and built the matching platform and a CMS for the top page
- Outcome
- One partner from business idea to public launch
* Works listed include services designed, developed and operated by our team members before joining the company.
Try it: make an invoice, right here.
Fill in the form for an instant qualified invoice, ready to print or save as PDF. Nothing you enter is sent or stored.
How we work
We start with your work and your users — not a list of features.
Consult
Share the work, the users and the pain points. No specifications needed.
Propose
We present the scope, a rough estimate and a plan.
Build
We build in stages, reviewing working software with you early on.
Operate
Maintenance, improvements and new features as needed.
Start by telling us
what is holding you back.
No specifications or requirement documents needed. We listen to how your work runs today, then propose a rough estimate and a plan. We visit in person anywhere in Karatsu and Saga.
Free consultation