Custom apps for growing businesses in Essex
Apps that make running your business easier
I build simple, custom apps shaped around the way you already work, so everything lives in one place, you save time and less gets missed.
Or email contact@sincosite.com
About me
Hi, I'm Tristan King
I help growing businesses bring everything into one simple app, built around the way they already work.
I've spent over ten years building and looking after the systems businesses rely on, so I know how much time you get back when the tools finally fit. You work with me directly from start to finish: the same person who designs it, builds it and looks after it.
I'm based in Chelmsford and work with businesses across Essex and online.
The idea
Everything in one place
As a business grows, the work spreads out: a spreadsheet here, emails there, bits of paper everywhere. It still works, there's just more to keep on top of, in more places.
I bring it together into one simple app, built around how you already work, so it's all in one place and easy to stay on top of.
Have a look at a real example →
What I can build
Apps built around how you work
Off-the-shelf tools make you fit around them. I do the opposite, and build the app around how you already work. A few examples:
Job & order tracking
Keep every job, case or order in one place, instead of a shared spreadsheet.
Scheduling & job diary
See who's doing what and when, in place of paper diaries and wall planners.
Stock & catalogue
Stock levels, ordering and product lists that stay up to date on their own.
Quotes & invoicing
Create quotes and invoices straight from the details you already hold.
Reports from the field
Turn the notes and photos taken on site into clean, finished reports.
Documents & certificates
Produce certificates, compliance documents and paperwork at the press of a button.
Customer records
Contacts, history and notes together in one place, not scattered across inboxes.
Works with your accounts
Send jobs and invoices straight to Sage, Xero or QuickBooks, instead of typing them twice.
Replace an old database
Move an ageing Access system into something modern that works anywhere.
See it in action
Example apps you can actually try
These aren't screenshots. They're real example apps you can click around right here, to get a feel for what yours could be like. Made-up data, just for a play.
Try the examplesHow it works
Simple, and no surprises
- 1
A free chat
Tell me what's eating your time. No charge, no pressure, no jargon.
- 2
A fixed price and a date
Before any work starts, you get one clear price and a finish date, in writing.
- 3
I build it with you
Built around how you work, checking in with you as it comes together.
- 4
It's yours
I hand it over and keep it running, so it just works and stays out of your way.
Common questions
Questions you might have
Will I own it?
Yes, it's yours, in your name, and built so you're never tied to me.
What if I want changes later?
That's normal and expected. Small fixes are included; anything new I'll price up front before doing it, so you're always in control of what you spend.
Do I have to change how I work?
No. I build around the way you already work: same routine, just quicker and smoother.
Who looks after it once it's live?
I do. I keep it online, backed up and up to date for a simple monthly fee, so you never have to think about it.
What will I use it on?
Laptop, phone or tablet, on Windows, Mac, iPhone or Android. Most apps open in the browser with nothing to install. And when you need a proper mobile app, one that works offline or out on the road, I build those too.
Contact
Let's talk
If you'd like your business running a bit more smoothly, I'd love to hear what you're juggling. No pressure, just a friendly chat to see if I can help.
How it's built
Web apps are built with Next.js, and when you need a proper mobile app, one that works offline or out on the road, I build native apps with Flutter, all backed by a PostgreSQL database and hosted reliably with regular backups. It's yours, in your name, and built so you're never tied to one person.