The Best Open-Source Alternatives to Retool

n8n is an open-source workflow automation platform that enables users to build custom workflows, automations, and integrations without relying on proprietary infrastructure, making it an excellent alternative to Retool for developers seeking a privacy-friendly solution. By leveraging a user-friendly visual interface and seamless API connections, n8n empowers users to create scalable, data-driven workflows without compromising on data ownership and control.

Apache Airflow is an open‑source platform for authoring, scheduling, and monitoring complex data workflows, enabling you to build and manage pipelines with code‑first, declarative DAGs; its self‑hosted, highly extensible design makes it a privacy‑friendly, fully transparent alternative to proprietary low‑code tools like Retool.

Appsmith is an open-source low-code platform that empowers developers to build custom business applications quickly, securely, and privately, rivaling the functionality of Retool without the proprietary costs and data ownership risks. Its intuitive interface, rich integrations, and customization capabilities make it an excellent choice for businesses seeking to build bespoke applications without compromising on data sovereignty.

Tooljet is a privacy-centric, no-code platform that empowers developers to build custom internal tools and applications without relying on proprietary solutions like Retool, offering unparalleled flexibility and user control. By leveraging a powerful low-code framework and an intuitive visual interface, developers can rapidly create and deploy tailored solutions that respect user data and organizational autonomy.

Budibase is an open-source, low-code platform for building custom business applications and automating workflows, empowering users to create scalable, data-driven tools without compromising on privacy. By offering a flexible, extensible, and community-driven solution, Budibase serves as an excellent, privacy-friendly alternative to commercial low-code platforms like Retool, giving businesses full control over their data and development processes.

Prefect is a cloud‑native, open‑source workflow orchestration platform that lets developers define, schedule, and monitor complex data pipelines with Pythonic ease. Its self‑hosted, privacy‑first architecture makes it an ideal, open‑source alternative to Retool for building and managing secure, scalable data workflows without third‑party dependency.