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Custom software development.
Custom software development is writing software that follows the way your company already works, so your team stops bending its process around tools designed for someone else. yop is a custom software development company in Tallinn: we design, code and ship it, and the code, the data and the accounts stay in your name.
What we build
Built from an empty file.
SaaS products
Subscription products with accounts, plans and payments, built to carry thousands of customers on one codebase.
Internal tools
The order screen, the approval flow, the weekly report: work your team now does by hand across five tabs.
MVPs
The smallest real product that answers the one question your investors keep asking.
Open →Build or buy?
Five questions, one honest answer.
Answer five questions. If an off-the-shelf tool fits, we will say so.
01Does your process differ from how most companies in your field work?
02Will more than 20 people use it every day?
03Do you need it to talk to systems you already have?
04Is the software itself part of what you sell?
05Do you need to own the code and data?
0 of 5 answered
Answer the questions to see a recommendation.
Buy. A ready-made tool will probably serve you well. Describe how you work and we will name the tool we would pick.
Mix. Keep a ready-made tool for the routine and let us build the one piece your competitors do not have.
Build. Your case fits custom software. The next step is a discovery workshop.
Compare
Custom or off-the-shelf?
| Question | ACustom softwareOur pick | BOff-the-shelf |
|---|---|---|
| Does it fit your process? | Built around it | You adapt to it |
| Who owns it? | You own the code and the data | You rent a licence |
| Upfront cost | Higher | Lower |
| Cost as you grow | Mostly hosting and upkeep | Rises with every seat |
| Time to start | Weeks | Days |
| Connections to other systems | Any system with an API | What the vendor supports |
How it works
Five doors to launch.
- 01
Discover
One workshop to map the problem, the users and what success looks like.
- 02
Design
Clickable screens before code, so changing your mind stays cheap.
- 03
Build
Short cycles, a live staging link and a demo every week.
- 04
Launch
Production, monitoring and the keys handed over to you.
- 05
Grow
SEO, GEO and new features, if you want us to stay.
Demand
A question many teams ask.
Source: Semrush, monthly searches, US database, October 2026
Questions
Asked before every project.
Something else on your mind? Ask us directly →
Your software
Start with one workshop.
In one session we sort out the problem, who will use the tool and how you will know it works. Building comes after, only if it makes sense.
How much does custom software cost?
It depends on scope. We price after a short discovery, as a fixed price per phase, so you never sign an open-ended contract.
Who owns the code?
You. We open the Git repository and the hosting under your company on day one and work inside them as guests.
Can you work with our own developers?
Yes. We often build the first version and then hand it over to an in-house team with documentation and pairing sessions.
How fast can yop deliver custom software?
A narrow internal tool is often live within weeks, while a full product runs for months. Discovery ends with a phase-by-phase calendar, and from then on a new build lands on your staging link each week.