Build vs buy: when custom software is actually worth it

The build vs buy question gets asked backwards. Most teams start with "should we build this" and should start with "does this exist".

When buying wins

Off-the-shelf products work when:

• The problem is standard (CRM, accounting, email, project management)
• Thousands of companies have the same need
• The product solves 80% of your requirement out of the box
• Your competitive advantage isn't in that function

Salesforce, Stripe, Freshworks, Linear — these work for millions of companies because the underlying problem is well-understood.

When building makes sense

Custom software is worth building when:

• Your business logic is genuinely unique
• The process is your competitive advantage
• Integration complexity exceeds what off-the-shelf can handle
• You need to own the data model completely
• No existing product covers your core workflow

Multi-tenant platforms with specific industry workflows, internal tools that mirror your unique operations, AI-powered systems that depend on proprietary data — these need to be built.

The hybrid approach

Most successful companies use both. Stripe for payments. Custom billing logic on top. Freshworks for support. Custom admin dashboards. Off-the-shelf for the generic parts, custom for what makes you different.

The decision framework

1. Is there an existing product that solves this? Start there.
2. If yes, does it cover 70%+ of what you need? Buy and extend.
3. If it covers less, or if the core logic is truly yours, build it.
4. If you're building, figure out what parts to still buy (auth, payments, emails, etc.)

Don't build auth from scratch. Don't build email delivery. Don't build file storage. Build what makes you different.