Think about when you actually scroll Reddit. On the couch with a coffee in the other hand. In line at the store. On the train, holding a rail. Lying on your side in bed. Almost never with the phone held in both hands like you’re about to type an essay.
When I rebuilt Redinfinite, I took that seriously. The rule was simple: everything you do while browsing has to work with one thumb, without shifting your grip. That one rule ended up deciding most of the interface.
Swipes Over Taps
A tap needs a target. You have to look for the button, aim, and hit it. A swipe doesn’t. You can swipe anywhere on the card, and your thumb already knows how.
So the main controls in Redinfinite are gestures on the post itself:
- Swipe left for the next post.
- Swipe right to go back.
- Swipe down also moves you to the next post, for when a downward flick is more comfortable than a sideways one.
I also made short, fast flicks count. You don’t have to drag a card all the way across the screen. A quick flick in either direction is enough, which matters a lot when your thumb only has an inch or two of travel from where it’s resting.
The Two Taps That Matter Most
Tapping still has a job, but I gave it to the two actions you use most, and neither needs a target.
Tap anywhere on the post to pause. Redinfinite auto-plays, moving to the next post after a few seconds. When something deserves a longer look, one tap anywhere stops it. Tap again to keep going.
Double-tap to save. It’s the same gesture people already know from liking photos, so there’s nothing to learn. It saves the post to your favorites without pausing the feed.
Between swipes, a tap, and a double-tap, you can browse, stop, go back, and save without ever looking at a button.
Buttons Live Where Your Thumb Already Is
There are still buttons, for people who prefer them and for less common actions like downloading or sharing. But I put all of them in one row at the bottom of the screen, under the post. That’s the part of a phone your thumb reaches without stretching.
The pause button sits in the middle of that row and is a little bigger than the rest, because it’s the one you’ll hit most. Back and next sit on either side of it. The less common actions sit at the edges.
The top of the screen is the hardest place to reach one-handed, so I split things by how often you touch them. The header up there holds what you set once per session: which feed you’re on, the sort order, settings. Everything you do on every single post lives at the bottom.
What I Kept Off the Main Screen
Building for one thumb meant leaving things out of the way.
Settings, like how many seconds each post stays up or how many times a video loops before moving on, live in a drawer. You set them once and forget about them. They don’t need to sit on the screen while you browse.
The button labels that pop up when you hover over a control only show up on desktop. On a phone, there’s no hover, and a screen full of little labels just adds clutter.
Auto-Play Is a One-Thumb Feature, Too
The easiest gesture is no gesture at all. Auto-play means you can set your phone down, or just hold it, and the feed keeps moving. Videos play through a set number of loops and then move on. When you want control back, you’re one tap away.
It’s the part of Redinfinite I use most myself. Some nights I don’t want to scroll. I want to watch.
The Bottom Line
One-thumb design isn’t about cramming everything into a small space. It’s about deciding what actually needs to be on the screen and putting it where your hand already is. For Redinfinite, that meant gestures for the main actions, one row of buttons at the bottom, and everything else tucked out of the way.
Next time you’re on the couch with one hand free, give it a try.
