There's no honest answer to 'how much does internal software cost?' without a defined scope. But there are honest ranges, and understanding what drives the range is more useful than a number anyway.
Rough ranges (US/EU dev rates, well-scoped)
- Single-workflow internal tool: $25K–$75K
- Multi-role tool with integrations: $75K–$200K
- SaaS-like internal platform: $150K–$500K+
- Enterprise system with compliance: $500K+
What moves the number
Number of integrations, number of user roles, regulatory requirements, data complexity, expected scale, and — most of all — how clearly the system has been specified before development. Vague specs get padded estimates. Tight specs get tight estimates. That's the entire economic argument for product architecture.
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