What Is Custom Software?
Custom software (also called bespoke software) is developed specifically to meet the unique needs of your business — unlike SaaS (Software as a Service), which is an off-the-shelf product shared by many users.
Custom software is a "tailored suit" while SaaS is "ready-to-wear clothing" — the tailored suit fits better but costs more and takes longer to make.
What Is SaaS and Why Is It Popular?
SaaS (Software as a Service) is software accessed via the internet with a monthly or annual subscription fee. Well-known examples:
- CRM: Salesforce, HubSpot
- Accounting: Xero, QuickBooks
- Project Management: Asana, Monday.com
- HR: Workday, BambooHR
- E-Commerce: Shopify, WooCommerce
The reason SaaS is so popular is speed to start — sign up today and you're running immediately, no months of development required.
Pros and Cons of Each Option
Custom Software
Pros:
- ✅ Designed 100% around your specific business processes
- ✅ No unnecessary features — simple and targeted
- ✅ You own the source code — no vendor dependency
- ✅ Full integration capability with existing systems
- ✅ Lower long-term costs — no perpetual monthly fees
- ✅ Scales with your business
Cons:
- ❌ Higher upfront cost
- ❌ Development takes 2–12 months
- ❌ Requires expertise to maintain
- ❌ Risk if you choose the wrong vendor
SaaS
Pros:
- ✅ Fast to get started
- ✅ Low upfront cost
- ✅ Built-in best practices
- ✅ Automatic updates by the provider
- ✅ Usually strong support and community
Cons:
- ❌ Limited customization — you must work within the software's workflow
- ❌ Monthly fees accumulate significantly over time
- ❌ Your data lives with an external provider
- ❌ If the provider shuts down or raises prices, you face a full migration
- ❌ Features you need may require more expensive plans
Cost Comparison: Custom vs SaaS Over 5 Years
| Custom Software | SaaS (Enterprise Plan) | |
|---|---|---|
| Year 1 | 500,000 THB (development) | 120,000 THB |
| Year 2 | 60,000 THB (maintenance) | 132,000 THB (+10%) |
| Year 3 | 60,000 THB | 145,000 THB |
| Year 4 | 60,000 THB | 160,000 THB |
| Year 5 | 60,000 THB | 176,000 THB |
| Total 5 years | 740,000 THB | 733,000 THB |
These are illustrative figures. The point: custom software is not always more expensive than SaaS over the long term.
Signs You Need Custom Software
Ask yourself these 5 questions:
- How unique are your business processes? If your workflow is complex and unlike others, SaaS will force you to change your process rather than supporting it.
- Do you integrate with multiple systems? SaaS integrations are often limited. If you need to connect many systems, a custom solution is more flexible.
- How sensitive is your customer or business data? Data passing through external SaaS systems carries risk.
- What's your monthly SaaS cost? If it's 50,000 THB/month, custom development pays for itself in 2–3 years.
- Is software part of your competitive advantage? If your software is part of your USP, custom is the answer.
When to Choose SaaS
- Business is just starting and needs to validate the model first
- Processes are standard with nothing special about them
- Limited budget in the short term
- Need to go live within 2–4 weeks
- No internal resources to maintain a custom system
Hybrid Approach: Start with SaaS, Then Go Custom
Many businesses start with SaaS — Shopify for e-commerce, Xero for accounting — then as they scale, build a custom backend that connects to existing SaaS via API.
This is the pragmatic approach Adowbig recommends for growing SMEs.
How Adowbig Can Help
We develop custom software through a clear process:
- Discovery Workshop — Deeply understand your business processes and requirements
- Prototype & Validate — Build a prototype before committing to full development
- Agile Development — 2-week sprints with demos every sprint so clients see progress throughout
- QA & UAT — Testing with real users before go-live
- Post-launch Support — SLA and support team after delivery
Want advice on whether to choose custom or SaaS? Consult the Adowbig team for free — we give honest assessments with no hidden agenda.