Adafruit IO or Plynx for your ESP32?

Put the finished project on your iPhone

Adafruit IO gives your ESP32 a browser dashboard. Your sketch sends values to feeds, and you place blocks on a web page to read or control them.

Plynx gives your project its own iPhone control panel.

Add the board. Flash the starter sketch. Put a button, gauge or chart on the screen. Connect it to the virtual pin your code uses. The result feels like part of the project, not like a page you need to find in a browser.

Build from the board outward

With Adafruit IO, the feed comes first. Your sketch publishes a value to a cloud service. The dashboard reads that feed.

With Plynx, the board comes first. You create the interface around the values and controls in your sketch.

Plynx.virtualWrite(V0, celsius);

That line updates the widget connected to V0. A control on the iPhone sends a value back to the virtual pin that your sketch handles.

This is a better fit when you are building a real device, not only logging sensor values. You can make a pump controller, a greenhouse monitor, a light panel or a workshop tool and give it an interface you will actually use every day.

Plynx is the better default for an ESP32 project

Plynx is the stronger choice when the main user is holding an iPhone.

It gives you a native dashboard instead of a browser page. It gives you Home Screen widgets, Lock Screen values and Apple Watch controls. It can connect directly to a nearby ESP32 over Bluetooth in beta. It also lets you run the server on your own Raspberry Pi when you want the project data to stay on your network.

The public Plynx server gets a project online quickly. Self-hosting gives you control later. You do not have to choose between a useful app and owning your setup.

Use Plynx when the project needs to feel finished

Choose Plynx if you want to:

• Control one or a few ESP32 boards from iPhone.
• Keep the firmware in C++.
• Build a dashboard around the hardware you made.
• See important values without opening a browser.
• Keep project data on your own network.
• Give a family member or customer a simple control panel.
• Ask Archimedes about the board while it can inspect the pin you mean.

Adafruit IO helps a board send data to a service. Plynx helps you turn the board into something people can use.

When Adafruit IO is the better choice

Adafruit IO makes more sense when browser access is a hard requirement. It also makes sense when an Android user needs the same dashboard.

It can also be practical when you are following a tutorial written specifically for Adafruit IO and want to reproduce it exactly.

If neither condition applies, Plynx gives an ESP32 a better home: a real app on the phone you already carry.

What Plynx does not do

Plynx is iPhone only. There is no Android app you can install today, and Adafruit IO runs in any browser, so for a household with mixed phones that difference decides it on its own.

We have nothing like Adafruit’s tutorial library, and we do not make hardware. Push notifications work only through the public Plynx server, not a self-hosted one, and the Apple Watch app relays through the iPhone, so the phone needs to be within reach.