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"Roughly how much does software like this cost?" is usually the first question in a project meeting. An honest answer is almost always: it depends on the scope. This article explains which factors drive the price, which costs arise after launch and how to arrive at a reliable budget.
Why there is no flat price
Custom software is built around your requirements. A simple internal tool for recording working hours and a platform with a customer portal, payment processing and several integrations differ in effort many times over. Both count as "custom software".
At its core, the price is the development effort, usually measured in person-days, multiplied by the team's day rate. Day rates vary by provider, region and specialisation. For your budget, however, the scope almost always matters more than the rate.
The main cost drivers
Feature scope
Every feature, every screen and every special rule takes development and testing time. Features with many exceptions are particularly costly, such as price calculations with numerous discount rules or approval processes with several stages.
Users and roles
Will only two people use the software, or do you need different roles with graded permissions for staff, customers and partners? A well-designed permission model is important, but it adds effort.
Integrations with other systems
Connecting inventory management, accounting, CRM or an online shop is often the biggest source of uncertainty. How well the other system's API is documented and how reliably it works can only be estimated to a limited extent in advance.
Data migration
Existing data from spreadsheets or legacy systems has to be cleaned, transformed and imported. The less consistent the data, the more work it takes.
Platforms
A web application in the browser is usually the leanest option. If mobile apps for iOS and Android are also required, the effort grows, even though cross-platform frameworks such as Flutter or React Native absorb part of it.
Design and usability
An internal tool can work with standard components. An application for your customers usually needs its own design and more attention to ease of use.
Security, data protection and traceability
If the software processes personal data or business-critical information, requirements for encryption, logging, backups and access control come into play. This is not an optional extra but part of a responsible solution.
The cost components of a project
Besides the programming itself, a software project includes other services that should appear in the quote:
| Phase | What happens | Typical content |
|---|---|---|
| Analysis and concept | clarify requirements, understand processes | workshops, requirements list, outline concept |
| Design | plan interaction and interface | clickable mock-ups, visual design |
| Development | build the features | frontend, backend, integrations |
| Quality assurance | find and fix defects | automated and manual tests |
| Rollout | prepare the go-live | data migration, training, documentation |
| Project management | coordination and steering | schedules, priorities, acceptance |
If items such as testing or project management are missing from a quote, that does not mean they will not occur. Ask where this effort has been included.
Ongoing costs after launch
A common planning mistake is letting the budget end at go-live. Software is not a one-off purchase; it has to be operated and maintained. Plan for these items from the start:
- Hosting and infrastructure: servers or cloud services, databases, backups, domains and certificates.
- Maintenance and security updates: the libraries and frameworks in use receive regular updates, many of them security-related.
- Bug fixing and support: even well-tested software meets situations in daily use that nobody anticipated.
- Further development: in our experience, new requests emerge as soon as users start working with the software.
- Third-party service fees: for example email delivery, map services, payment providers or AI APIs that are billed by usage.
Many providers offer maintenance contracts with a fixed monthly fee or a pool of hours. Clarify which response times and services are included.
Fixed price or time and materials?
Both models have advantages and drawbacks.
A fixed price gives you planning certainty but requires a very precise description of the scope. The provider prices in the risk of unclear requirements, and every later change becomes a change request.
Time and materials, often organised in sprints (fixed development cycles of, say, two weeks), is more flexible. You can adjust priorities continuously and pay for what is actually built. In return, you need transparency on progress and a budget cap that both sides monitor.
In practice, a combination often works well: a fixed price for the concept phase, followed by implementation on a time-and-materials basis within an agreed budget frame.
How to plan your budget, step by step
- Define the goal: which problem should the software solve, and how will you measure success? For example, working time saved or fewer errors.
- Prioritise requirements: distinguish between "must", "should" and "nice to have". This makes the scope negotiable.
- Start with an MVP: an MVP (minimum viable product) is a first usable version with the most important features. It lowers the initial budget and delivers real-world experience early.
- Commission a concept phase: a paid analysis before implementation costs money but significantly reduces the risk of expensive wrong decisions.
- Plan a buffer: unclear integrations and new insights are part of every project. A reserve keeps you from having to drop important features.
- Calculate follow-up costs: include operations, maintenance and further development for at least three years.
- Make quotes comparable: check whether all quotes include the same services, including testing, documentation and source code rights.
How to recognise a sound quote
A reliable quote describes which features are included and which are not. It states its assumptions, for example about the quality of existing interfaces, and explains how changes will be handled. Be cautious if a binding price for a complex project is given after a short phone call. Either a large risk premium has been priced in, or important parts are missing.
Estimating your project together
Simplify Data, based in Kiel, Germany, develops custom software for companies in Schleswig-Holstein, Hamburg and remotely across Germany. We start by clarifying requirements together and show you transparently which features drive which effort. Learn more on our software development page.