SaaS vs traditional software
Kahu team·Updated 2 Oct 2026·6 min read
For most small businesses SaaS is the better default: low start-up cost, automatic updates and access from anywhere. Traditional installed software still makes sense when you need it to work offline, must keep data on your own machines, or use specialist software that has no good online version. Compare the cost over three years, not the first month.
The core difference
Traditional software is something you buy, install and look after yourself, usually on your own computer or a server in the office. SaaS is software you rent and use over the internet. The provider runs it, updates it and stores the data. Neither is better in every case. They trade money, control and effort in different ways.
Side by side
| SaaS | Traditional software | |
|---|---|---|
| Paying for it | Ongoing subscription, often per user | Larger one-off licence, sometimes with paid upgrades |
| Getting started | Sign up and log in the same day | Install, configure and sometimes buy hardware |
| Updates and security fixes | Applied by the provider | Your job, or your IT person’s |
| Working remotely | Any device with internet | Usually tied to the machine or office network |
| Your data | Held by the provider | Held by you |
| Working offline | Limited, depends on the tool | Usually full |
| Leaving | Export your data and cancel | Keep using the old version, unsupported |
Look at the cost over three years
A subscription looks cheap in month one and a licence looks expensive. The fair comparison is the total over the time you will actually use it. For installed software, add the hardware, backups, upgrades and the hours someone spends maintaining it. For SaaS, multiply the monthly fee by your number of users and months, and check what happens to the price after any introductory offer.
When traditional software still makes sense
- You work where the internet is unreliable and the work cannot wait.
- A contract, client or regulator requires data to stay on your own equipment.
- You rely on specialist design, engineering or machine software with no equivalent online version.
- You already own a licence that does the job and costs nothing more to keep using.
Where Kahu fits
Two Thursday gaps at 11:00 and 14:30. Drafted messages to 6 waitlisted customers.
Updated the hours on your site and Google profile to Sat–Sun 8–2.
One post about the new hours, using your Sunday counter photo.How to decide
- 1Name the jobWrite down what the software must do and who needs to use it, and from where.
- 2Check the hard requirementsOffline use, data location and industry rules. These can decide it on their own.
- 3Compare three-year costInclude people’s time, not just fees and licences.
- 4Try before you commitMost SaaS tools offer a free trial or free plan. Run a real week of work through it.
Frequently asked questions
Is SaaS cheaper than traditional software?
Cheaper to start, almost always. Over several years it depends on the number of users and how much maintenance the installed option would need.
Can I mix SaaS and installed software?
Yes, and most businesses do. What matters is that they share data where needed, so nobody types the same thing twice.
What happens to my data if a SaaS provider shuts down?
Reputable providers usually give notice and an export window. Export your important data now and then, so you always hold a copy.