Best 6 Tools for Building Custom Integrations in 2025

Activepieces is a workflow automation platform that connects your business apps and creates automatic actions between them. You build flows by dragging steps onto a canvas, choosing when things should happen and what actions to take. Unlike basic automation tools, Activepieces includes AI agents that can make smart decisions and handle complex tasks on their own.

Celigo is an integration platform as a service that connects different business applications so they can share information and work together. Instead of manually entering the same data into multiple systems, Celigo automatically moves information between your tools in real time.

Retool is a low-code platform that simplifies building internal business applications. Instead of writing thousands of lines of code, you use pre-built components like tables, forms, buttons, and charts. You can arrange these visually and connect them to your databases, spreadsheets, or other systems.

Budibase is an "open-source low-code platform" designed specifically for building internal business applications. This means you can create tools like admin panels, approval workflows, data dashboards, and form-based apps without writing extensive code.

n8n is a fair-code workflow automation platform that uniquely combines visual building with custom coding capabilities. Think of it as a powerful middle ground between simple automation tools and complex programming frameworks.

Zapier is an online automation platform that acts as a bridge between different software applications. Think of it as a translator that helps your apps talk to each other and work together automatically. The platform operates on a simple concept: when something happens in one app (the trigger), it automatically does something in another app (the action).