Live Steam player count comparison, updated every 10 minutes. Both are Indie games.
Kerbal Space Program is currently the more played game: 3,225 concurrent players on Steam right now vs 2,359 for Undertale — about 37% more players. Across all tracked metrics, Kerbal Space Program leads 6 of 9.
Coilr tracks charts like this for every game — and playtime history for your own library.
Tracked by Coilr since April 2026 · Steam polled every 10 minutes · methodology
| Metric | Kerbal Space Program | Undertale |
|---|---|---|
| Players right now | 3,225 | 2,359 |
| 24-hour peak | 5,282 | 3,875 |
| 7-day average | 4,084 | 2,722 |
| 30-day average | 4,084 | 2,527 |
| 30-day trend | — | +52% |
| Peak (tracked) | 5,282 | 3,957 |
| Steam reviews | 96% positive | 96% positive |
| Recent reviews (3 mo) | 98% positive | 96% positive |
| Total reviews | 144,582 | 330,258 |
| Owners (SteamSpy est.) | ~2,000,000 | ~5,000,000 |
| Release date | Apr 27, 2015 | Sep 14, 2015 |
| Price | $39.99 | $9.99 |
Full stats: Kerbal Space Program · Undertale · add more games to this comparison →
| Month | Kerbal Space Program | Undertale | ||
|---|---|---|---|---|
| Avg | Peak | Avg | Peak | |
| Apr 2026 | — | — | 1,028 | 1,458 |
| May 2026 | — | — | 951 | 1,373 |
| Jun 2026 | — | — | 1,947 | 3,530 |
| Jul 2026 (so far) | 4,052 | 5,282 | 2,782 | 3,957 |
Monthly average and peak concurrent players on Steam, from Coilr's own tracking (10-minute polls, hourly beyond 30 days).
Kerbal Space Program currently has more players: 3,225 concurrent players on Steam vs 2,359 for Undertale — about 37% more players.
Over the last 30 days Kerbal Space Program averaged 4,084 concurrent players and Undertale averaged 2,527. By that measure Kerbal Space Program is currently the bigger game.
By Steam review score, Undertale rates higher: 96% positive across 330,258 reviews vs 96% across 144,582 for Kerbal Space Program. Kerbal Space Program has the larger player base right now (3,225 vs 2,359 concurrent). Player counts, ratings, price and trend are compared side by side above.
Undertale averaged 2,527 concurrent players over the last 30 days, up 52% vs the previous 30 days. Its highest tracked player count is 3,957.