PolyGroundComparison
PolyGround vs Manifold
This is the closest comparison on the site — both are play money, both are free. The difference is user-created breadth versus a curated mobile game.
Manifold is a play-money prediction platform where anyone can create a market on anything. That openness is its defining feature: the catalogue is enormous and ranges from serious geopolitical forecasting to in-jokes about the community itself. It is web-first, with an active forecasting culture around it.
PolyGround takes the opposite approach. The question set is curated and finite, focused on things a general audience already argues about, and the experience is built as a mobile game with progression, streaks and leaderboards.
| PolyGround | Manifold | |
|---|---|---|
| Currency | Virtual coins, no cash value | Play money |
| Who creates questions | Curated | Anyone |
| Catalogue size | Focused — a curated set at a time | Very large |
| Primary platform | Android app | Web |
| Progression | XP, levels, badges, quests, streaks | Minimal |
| Best for | Casual play, learning the format | Serious forecasting, niche questions |
Pick by what you want out of it
Want the widest possible range of questions and a community that takes calibration seriously? Manifold. Want something you open on your phone for two minutes that keeps score and makes being right feel good? PolyGround.
Breadth versus focus
A user-created catalogue is a genuine strength — whatever obscure thing you care about, someone has probably made a market for it. The cost is signal-to-noise: many questions have almost no participation, so their prices reflect one or two opinions rather than a crowd.
A curated set trades that away. You cannot ask about your specific niche, but the questions you do see are ones a general audience is actively engaging with. For someone learning the format, that is usually the better starting point.
Game mechanics
This is where the two genuinely diverge. PolyGround is built as a game first: press and hold to size your stake, swipe to cash out before resolution, earn XP that never decreases on correct calls, chase eight badges and sixteen quests, keep a daily streak alive, climb daily, weekly and all-time leaderboards.
Manifold is a forecasting platform that happens to use play money. If progression mechanics sound like noise on top of the real activity, that is a reasonable position — and Manifold is the better fit for it.
Mobile versus web
PolyGround is an Android app and nothing else. Everything — the feed, the charts, holding to stake — is designed for a phone in one hand. Manifold is web-first with mobile access. If your prediction habit lives in idle moments rather than at a desk, that difference matters more than it sounds.
Related
PolyGround vs Polymarket · PolyGround vs Kalshi · Free prediction market apps
Try it yourself — free
PolyGround is a play-money prediction game. Real-world questions, live odds, virtual coins. No deposits, no cash-out, no crypto.
Get it free on Google Play