Post
Smart top up is here
Your stack used to refill at random. Now it reads what you actually play, picks games that fit, and tells you why each one made the cut.

When a stack ran low, StackPop used to refill it from your backlog at random. That was fine, mostly. But random has two annoying habits. It kept handing me the same handful of games. And it had no idea I've sunk a thousand hours into colony sims and roughly zero into sports.
Random doesn't know you. So I taught the picker to pay attention.
The picker reads your history now
When a stack runs low, or you tap Top up, StackPop fills it with games that fit you. It looks at what you've finished, what you rated high, what you've put the most hours into, and what you've been playing the last few weeks. Then it pulls games off your backlog that line up with all of that.
Here's a real one from my account. I have over a thousand hours in Stellaris and a few hundred in RimWorld. When my retro stack ran low it surfaced Advance Wars and Ogre Battle 64. Turn-based tactics, deep systems, the exact shape of game I keep coming back to. Not a single sports cart in the bunch.
Every pick tells you why
This is the part I like most.

Each game it picks comes with a one-line reason, written from your own history. Pop it and there's a small "Why this was picked" note on the card. Mine read like "Given the hundreds of hours you put into RimWorld, Ogre Battle 64 scratches the same tactical itch." It names the games you actually played, not some generic blurb.
It turns the pick from "here's a random thing" into "here's why you, tonight, might want this one." Small change, but it's the difference between a roulette wheel and a friend who knows your taste.
A straight word on the AI part
Yes, there's a language model doing the matching and writing those one-line reasons. I know "AI" sets off alarms, and most of what wears that label right now is generic slop. This isn't that. The model never browses the internet and never makes up games. It gets exactly two things: the games actually sitting on your backlog, and a short summary of your own play history. Every pick is a game you already own, and every reason points back to hours you actually logged. It is personalization, not generation. The goal was never to sound clever. It was to hand you something off your own shelf you'll genuinely want to play tonight.
It stops repeating itself
The other fix was variety. The old refill would cheerfully serve me the same five well-rated games on a loop. The new one remembers what it put in front of you recently and pushes those to the back, so the deep cuts get a turn. The games gathering dust are the ones you imported and forgot about, and those are exactly the ones worth rediscovering.
You're still in charge
Smart top up is on by default for every stack, and it's a switch in each stack's settings. Turn it off and that stack goes back to plain shuffled picks. It still honors everything else you set: platform filters, genres, minimum rating, skip cooldowns. It never pulls in a game you skipped until the cooldown is up. And if anything hiccups behind the scenes, it quietly falls back to a shuffled pick so your stack is never left empty.
Try it
Log into StackPop, open a stack, and hit Top up. Then read why it picked what it picked. If the picker starts feeling like it actually gets you, that was the whole idea.