gSender is great — but it's stuck at your desk

Let's be clear up front: gSender is an excellent piece of software. Sienci built a clean, approachable G-code sender that a lot of hobbyists — including plenty of OpenBuilds and Shapeoko owners — reach for first, and for good reason. UGS and OpenBuilds Control earn their followings too. This isn't a "gSender killer" article. It's about the one thing every one of those tools has in common, and what to do about it.

They all run on a desktop.

gSender, UGS, OpenBuilds Control, CNCjs, bCNC — every serious GRBL sender lives on a laptop or a host PC wired to the machine. That's not a flaw; it's a design choice that makes sense for a full-featured control station. But it means the moment you want to step away from the computer, you lose your read-out and your controls.

The problem a phone solves (and a desktop can't)

Think about the moments in a session where the desktop actually gets in your way:

• Setting work zero. You want to be at the bit, eyeballing it against the stock, not reaching back to a keyboard three feet away.
• Watching the first few minutes of a cut. You want to stand where you can see chips and hear the spindle, with a live position read-out in your hand — not glued to a fixed screen.
• Checking on a long job. You're doing something else in the shop and just want to glance at progress without walking back to the PC.
• Machines without a nearby computer. A garage MPCNC or a small engraver where setting up a whole laptop station is more hassle than the job is worth.

A phone is the natural tool for all of these. It's already in your pocket, it has a good screen, and you can carry it around the machine.

Companion, not replacement

The healthiest way to think about a mobile sender is as a companion to your desktop setup, not a rival to it. Different tools for different moments:

You don't have to pick a side. Keep gSender for what it's great at and add a phone for the times you'd rather not be chained to the desk.

What a good mobile companion looks like

Gantry was built for exactly this role. It gives you, on your phone:

• A live DRO (machine + work coordinates, feed, spindle, state) and a thumb jog pad.
• G-code streaming with start / pause / resume / stop, and a real-time 3D toolpath view so you can watch the head move.
• Run-from-line recovery, auto-reconnect and keep-awake for when a job drops.
• Probing, a feeds & speeds calculator, and a surfacing wizard for at-the-machine work.

And crucially, it fits your shop two ways: run a small Wi-Fi server on the same PC you already use for gSender, or connect the phone straight to the controller over USB/Bluetooth with no PC — see running a CNC without a laptop.

It's also the anti-SaaS kind of tool: no account, no ads, no tracking, and free to use, with optional one-time packs for advanced features — no subscription.

Try it alongside what you already use

You don't have to change your desktop workflow to add a phone to it. Keep gSender on the bench; put a live DRO and jog pad in your pocket for everything you do standing at the machine. Gantry is free on Google Play and has a built-in simulator, so you can see how the companion role feels before you connect it to your machine.

gSender, UGS, OpenBuilds Control, CNCjs and bCNC are the work of their respective teams and communities; this article is written by the maker of Gantry and reflects our own view of where a mobile tool fits. Safety first: never leave a running job unattended.