Live Steam player count comparison, updated every 10 minutes. Both are Indie games.
Slay the Spire is currently the more played game: 5,596 concurrent players on Steam right now vs 2,926 for Undertale — about 1.9× more players. Across all tracked metrics, Slay the Spire leads 6 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 | Slay the Spire | Undertale |
|---|---|---|
| Players right now | 5,596 | 2,926 |
| 24-hour peak | 10,911 | 3,456 |
| 7-day average | 7,982 | 2,833 |
| 30-day average | 8,608 | 2,386 |
| 30-day trend | −2% | — |
| Peak (tracked) | 15,737 | 3,957 |
| Steam reviews | 97% positive | 96% positive |
| Recent reviews (3 mo) | 95% positive | 96% positive |
| Total reviews | 216,051 | 330,258 |
| Owners (SteamSpy est.) | ~5,000,000 | ~5,000,000 |
| Release date | Jan 22, 2019 | Sep 14, 2015 |
| Price | $24.99 | $9.99 |
Full stats: Slay the Spire · Undertale · add more games to this comparison →
| Month | Slay the Spire | Undertale | ||
|---|---|---|---|---|
| Avg | Peak | Avg | Peak | |
| Apr 2026 | — | — | 1,028 | 1,458 |
| May 2026 | 9,434 | 15,650 | 951 | 1,373 |
| Jun 2026 | 8,811 | 15,737 | 1,945 | 3,530 |
| Jul 2026 (so far) | 8,140 | 13,362 | 2,808 | 3,957 |
Monthly average and peak concurrent players on Steam, from Coilr's own tracking (10-minute polls, hourly beyond 30 days).
Slay the Spire currently has more players: 5,596 concurrent players on Steam vs 2,926 for Undertale — about 1.9× more players.
Over the last 30 days Slay the Spire averaged 8,608 concurrent players and Undertale averaged 2,386. By that measure Slay the Spire is currently the bigger game.
By Steam review score, Slay the Spire rates higher: 97% positive across 216,051 reviews vs 96% across 330,258 for Undertale. Slay the Spire has the larger player base right now (5,596 vs 2,926 concurrent). Player counts, ratings, price and trend are compared side by side above.
Slay the Spire averaged 8,608 concurrent players over the last 30 days, roughly flat vs the previous 30 days. Its highest tracked player count is 15,737.