Best 12 Open Source Retool Alternatives in 2026

Unlike traditional automation tools, Pipedream gives you the power to write custom code when needed while providing thousands of pre-built components for common tasks. The platform handles all the infrastructure, authentication, and scaling automatically, so you can focus on building workflows instead of managing servers.

Each workflow is a series of steps that run when triggered by events like new emails, API calls, or scheduled times. With support for major programming languages and integration with popular services like Slack, Google Sheets, GitHub, and Stripe, Pipedream makes it easy to automate almost any business process or technical workflow.

It uses step functions and incorporates real-time event processing, enabling developers to build complex workflows that can run for days or months with automatic error recovery. The main difference from regular workflow tools is simple: instead of setting up queues and managing state, you write normal code and Inngest handles all the infrastructure complexity.

Each step in your workflow automatically retries on failure and maintains state between executions, allowing you to easily build reliable systems. Founded in 2021, this tool has become popular because it eliminates infrastructure headaches and makes complex workflows easy. You can write functions in TypeScript, Python, or Go and deploy anywhere.

The platform supports agents that can make decisions, use tools, and perform multiple tasks automatically. It also enables Retrieval Augmented Generation (RAG), which lets AI applications search through your documents and provide accurate answers based on your specific data.

There is no cost to use Langflow. It's completely free and open-source. You only pay for external services you connect to it, such as AI model providers like OpenAI or cloud hosting if you choose to deploy your application online.

The tool works in two ways: you can run it on your own servers (open-source version) or use their hosted cloud service. Both options give you a clean dashboard to see what's running, what failed, and where problems occurred. Prefect automatically retries failed tasks, caches results to save time, and sends alerts when issues arise.

What makes Prefect special is its flexibility. It works with your existing code without forcing you to restructure everything, making it easier to adopt than many alternatives.

The platform lets you build chatbots that understand documents, create AI agents that can perform tasks automatically, and set up workflows that combine multiple AI tools. It supports retrieval-augmented generation, which means your AI can pull information from your own documents and databases to give accurate answers.

You can start with ready-made templates or build custom solutions from scratch. Flowise works with both cloud-based and locally-hosted AI models, giving you flexibility in how you deploy your applications. The platform is open-source, meaning the community constantly adds new features and improvements.

What makes Dagster different is how it thinks about data. It tracks your tables, files, and models as important items (called assets) rather than just focusing on the jobs that create them. This helps you see how all your data connects together.

The platform includes features for testing your code before it goes live, checking data quality automatically, and showing you how much your data processes cost. You can use it on your own servers or in the cloud through their managed service.

You define your workflows using Python code, which means you can use all the tools you already know. Each workflow is called a DAG, which shows how your tasks connect and depend on each other. Airflow comes with a visual web dashboard where you can see your workflows running, check logs, and restart failed tasks.

The platform works with cloud services like AWS, Google Cloud, and Azure, plus hundreds of other tools through ready-made connections. You can run it on your own servers or use managed services like Astronomer.

Unlike traditional automation tools that require deep programming knowledge, Kestra uses a straightforward approach. You can build workflows through a visual interface or write them in YAML, which is much easier to read and understand than regular code. The platform can run any programming language, connect to databases, send notifications, process files, and interact with cloud services.

There are two versions available: a free open-source edition for individuals and teams, and an Enterprise edition with advanced features for larger organizations.

The platform works as a workflow engine that connects different scripts together. You can schedule tasks, create APIs from your scripts, and build custom apps with a drag-and-drop interface. Windmill supports both cloud hosting and self-hosting on your own servers.

There are free and paid versions. The free version includes unlimited script creation and basic features, while paid plans offer more executions, advanced support, and enterprise features like audit logs.

The platform uses a node-based system where you can drag and drop pre-built components or ask AI to generate custom nodes for your specific needs. It runs on Google Cloud Platform, ensuring enterprise-grade scalability and security. BuildShip connects seamlessly with popular AI models like ChatGPT, databases like Firebase and PostgreSQL, and hundreds of third-party services.

Founded in 2023 by the team behind Rowy, this platform has become popular because it eliminates the complexity of traditional backend development while giving you full control over your code when needed.