Live Steam player count comparison, updated every 10 minutes. Both are Indie games.
ULTRAKILL is currently the more played game: 3,192 concurrent players on Steam right now vs 3,115 for Undertale — a similar number of players. Across all tracked metrics, ULTRAKILL leads 7 of 8.
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 | ULTRAKILL | Undertale |
|---|---|---|
| Players right now | 3,192 | 3,115 |
| 24-hour peak | 4,016 | 3,875 |
| 7-day average | 2,910 | 2,718 |
| 30-day average | 2,922 | 2,517 |
| 30-day trend | — | +52% |
| Peak (tracked) | 4,016 | 3,957 |
| Steam reviews | 97% positive | 96% positive |
| Recent reviews (3 mo) | 97% positive | 96% positive |
| Total reviews | 237,278 | 330,258 |
| Owners (SteamSpy est.) | ~5,000,000 | ~5,000,000 |
| Release date | Sep 3, 2020 | Sep 14, 2015 |
| Price | $29.99 | $9.99 |
Full stats: ULTRAKILL · Undertale · add more games to this comparison →
| Month | ULTRAKILL | Undertale | ||
|---|---|---|---|---|
| Avg | Peak | Avg | Peak | |
| Apr 2026 | — | — | 1,028 | 1,458 |
| May 2026 | — | — | 951 | 1,373 |
| Jun 2026 | 3,660 | 3,768 | 1,947 | 3,530 |
| Jul 2026 (so far) | 3,066 | 4,016 | 2,787 | 3,957 |
Monthly average and peak concurrent players on Steam, from Coilr's own tracking (10-minute polls, hourly beyond 30 days).
ULTRAKILL currently has more players: 3,192 concurrent players on Steam vs 3,115 for Undertale — a similar number of players.
Over the last 30 days ULTRAKILL averaged 2,922 concurrent players and Undertale averaged 2,517. By that measure ULTRAKILL is currently the bigger game.
By Steam review score, ULTRAKILL rates higher: 97% positive across 237,278 reviews vs 96% across 330,258 for Undertale. ULTRAKILL has the larger player base right now (3,192 vs 3,115 concurrent). Player counts, ratings, price and trend are compared side by side above.
Undertale averaged 2,517 concurrent players over the last 30 days, up 52% vs the previous 30 days. Its highest tracked player count is 3,957.