Custom Software vs Off-the-Shelf: How to Decide
When to buy a packaged product, when to build your own software, and when a mix of both is the smartest choice, with the questions and costs to weigh before deciding.
Should you buy an existing software product or build your own? It is one of the most common technology decisions a business makes, and one of the most expensive to get wrong. There is no single right answer, but there is a reliable way to reach the right answer for you.
When off-the-shelf software is the better choice
- The process is standard. Accounting, payroll, email and basic CRM work much the same in most companies. Products built for thousands of customers usually do them well.
- You need it quickly. A packaged product can often be running in days or weeks.
- You do not want to run software. The vendor handles hosting, updates, security and support.
- Your budget is limited up front. Subscriptions spread the cost over time.
When custom software is the better choice
- The process is what makes you different. If the way you price, serve customers or run operations is a competitive advantage, forcing it into a generic product can erase that advantage.
- Packaged products need heavy workarounds. If people would still rely on spreadsheets, email and manual re-entry around the product, the real cost is much higher than the subscription.
- You need deep integration. When several systems must work together closely, a custom application can tie them together cleanly.
- Subscription costs grow too fast. Per-user pricing that is cheap for ten people can become expensive for a thousand.
- You may sell it. If the software could become a product for others, owning it matters.
The middle path: buy the core, build the edges
Many organisations get the best result from a mix: a packaged product for the standard core, with custom applications, integrations or portals for the parts that are unique. For example, a standard ERP for finance and inventory, with a custom dealer portal or field-service app connected to it.
Compare total cost over five years
Comparing a subscription price with a development quote is misleading. Instead, estimate the total cost of each option over five years:
- Off-the-shelf: subscriptions as you grow, implementation, customisation, integrations, training and the cost of workarounds.
- Custom: design and development, hosting, support and maintenance, and ongoing improvements.
Add the value side too: time saved, errors avoided and revenue gained from doing things your way.
Risks to weigh
- Off-the-shelf: the vendor may change prices, drop features or be acquired; your data may be hard to export; you wait for the vendor's roadmap.
- Custom: the project may overrun if the scope is unclear; you are responsible for upkeep; and you depend on whoever maintains the code, so insist on owning it and on good documentation.
Five questions to decide
- Is this process a source of competitive advantage for us?
- Does a packaged product cover at least most of what we need without workarounds?
- How many users will we have in three to five years, and what will that cost?
- How closely must this connect to our other systems?
- Do we have, or can we rent, the skills to maintain custom software?
If you answer "no, yes, few, loosely, no", buy. If you answer "yes, no, many, closely, yes", build. Mixed answers usually point to the middle path.
Getting an independent view
At AdharAI we both build custom software and run our own software products, so we see the decision from both sides, and we will recommend a packaged product when that is the better fit. Read about our enterprise application development and technology consulting services, or schedule a consultation to talk through your situation.