Let me save you a search: there is no great AI agent builder app for iOS and Android in the way you are imagining. Nobody is dragging agent nodes around on a phone screen and shipping production systems from the subway. The mobile story for AI agents is real. It is just a different story than the desktop one, and the app stores will not tell you that.
Here is what actually exists. Most visual builders, the Flowise and Langflow and n8n crowd, are web apps. They open in a mobile browser, technically. They were designed for a big screen and a mouse, and it shows. Every AI agent builder tool claims to be mobile-friendly. Almost none are, in the way that matters. What works well on mobile is monitoring: checking what your agents did overnight, approving an action, getting pinged when something needs a human. That is the mobile use case worth optimizing for. It is also underserved, which is either a gap or an opportunity depending on your ambitions.
So if you are evaluating an AI agent builder app on iOS or Android, ask the right questions. Does the platform have a usable mobile view for checking runs? Can you approve or stop an agent from your phone? Do alerts reach you through push, or just email? A builder with great desktop tooling and zero mobile visibility will surprise you at 2 AM. Not pleasantly.
The deeper question is architectural. Agents that expose clean run traces and APIs can be monitored from anything, including a phone, because someone can build the mobile layer on top. Agents locked inside a desktop-only dashboard cannot. When you compare builders, weight the API and the observability as heavily as the canvas. Heavier, honestly.
Our database at localaiagents.fyi scores frameworks partly on this kind of practical maturity, which feeds straight into the mobile app to monitor AI agents question. And if you want an agent built with monitoring designed in from day one, I build custom AI agents scoped to your actual workflow at localaiagents.fyi.