Question: I'm looking for a no-code app development platform that integrates with Firebase and supports API calls.

If you're looking for a no-code app development platform that integrates with Firebase and makes API calls, FlutterFlow is worth a look. It's got a visual drag-and-drop interface, real-time collaboration and a lot of support for animations and UI elements. With a UI builder, custom code editor and API support, FlutterFlow lets you build modern apps that can be published to app stores, the web or custom domains. It's also got a range of pricing options, including a free tier.

Another good option is Pipedream. The service lets developers build complex apps by hooking into more than 2,100 APIs, including Firebase. Pipedream lets you control low-level code when you want, but also offers no-code interfaces for convenience. Its features include instant deployment, support for Node.js, Python, Go and Bash, and a long list of APIs, so it's good for projects that need a lot of API integration.

If you're looking for a no-code option that's geared for scalability and security, check out Bubble. Bubble is a full-stack app builder with a drag-and-drop editor, hundreds of customizable templates and AI-generated pages. It's got API connectors, custom domains and real-time collaboration, so it's good for startup projects and enterprise-scale web apps. Bubble also has a range of pricing tiers, including a free development version.

Last, Backendless is another low-code option worth a look. It's got a full suite of tools for building and running high-performance apps. Backendless has a visual UI builder, codeless logic and direct API integration. It's got support for responsive apps for web and mobile, real-time database abilities and integration with services like FlutterFlow and Zapier. Its flexible deployment options and feature set make it good for a broad range of apps.