How to choose custom vs off-the-shelf

This is not a personality test. It is whether a product that already exists can run your Tuesday without a hero. If it can, buy it. If the workaround has become the company — exports, retyping, a sheet nobody trusts — custom is cheaper than another year of seats plus overtime.

SINLE Innovation Agency will tell you to buy when the job is common. We take the 20% that is actually the business and leave you the keys. We will not rebuild email so a slide can say “platform.” Pilot is a small site. Invent is a core workflow you own. If leaving the vendor kills the process, you rented a department. We will not sell you that.

Most companies need a mix. The sequence below is how you decide which 20% is worth a statement of work.

How the mix usually lands

Buy the common 80%: email, payroll, a calendar. Build the 20% that is the company: the queue, the lock, the status a customer should see. A staged move beats a rewrite. Monday still has to run on the package while the painful job moves into software you own.

If leaving the vendor kills the week, you rented a department. That is the line. Taste is not a reason to build. A hero in a spreadsheet is.

The sequence

Do these in order. Skip a line and you are back to a workshop.

1. 01

   Write the job the package would have to survive

   If a normal tool already does 80% and the rest is taste, buy the tool.

2. 02

   Count the unofficial steps

   Exports, retyping, a hero in a sheet. Three or more is a smell that the package is the workaround.

3. 03

   Price five years

   Seats, overage, the integrator, the day the vendor kills the feature you need.

4. 04

   Ask who owns the workflow

   If leaving the vendor kills the process, you rented a department.

5. 05

   Build only the 20% that is the business

   Do not rebuild email. Extract the painful job into software you own.

6. 06

   Keep the package where it fits

   A staged migration beats a big-bang rewrite. Monday still has to run.