stack127 is a toolbox and reference hub for indie hackers, solo developers, and digital creators who build and run projects online. Use its free tools to calculate SaaS metrics such as MRR and churn, estimate Amazon KDP royalties, check domains and DNS, and plan hosting and storage. Its directories help you compare platform fees, discover CLI apps and self-hosted software, and find places to launch a product. Reference pages explain facts such as domain status codes and software licenses. Built by Ravi Teja KNTS, stack127 turns repeated questions and practical project work into tools and resources other builders can use. Most of its tools are open source through stack127labs on GitHub.
The SaaS tools help you work with recurring revenue, retention, churn, margins, and acquisition costs using your own monthly figures. For example, 100 active subscriptions at $29 per month produce $2,900 in MRR. The KDP catalog helps authors size pages and covers, check files and listing details, estimate royalties, and understand payment dates.
The DNS and domain catalogs cover public records, registration information, availability, and domain status codes. Storage tools help you compare drive capacity and topology. Hosting and system tools support resource planning and checks for server rules, file permissions, and container configuration.
The reference hub also includes keyboard shortcuts, software license explanations, a TLD directory, and a course for self-hosting beginners. Directory entries link to official sources so you can compare options and check the details yourself. Choose a catalog, open the tool or reference you need, and use it for your project.
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