# Free SaaS Tools & Calculators | Gigacatalyst

Canonical URL: https://gigacatalyst.com/tools

# Free SaaS Tools & Calculators

Make smarter decisions about building, buying, and extending your SaaS product.

[## Custom App Development Cost Calculator Estimate what it actually costs to build custom features in-house based on your specific requirements.](/tools/custom-app-cost-calculator)[## Build vs Extend vs Replace Calculator Compare the true cost of building from scratch, extending your existing SaaS, or replacing it entirely.](/tools/build-vs-extend-calculator)[## SaaS Customization Readiness Score Find out if your product is ready for customer-facing customization with a quick diagnostic quiz.](/tools/saas-customization-readiness)