Live Steam player count comparison, updated every 10 minutes. Both are Indie games.
American Truck Simulator is currently the more played game: 5,180 concurrent players on Steam right now vs 3,730 for Undertale — about 39% more players. Undertale is currently 75% off on Steam. Across all tracked metrics, American Truck Simulator 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
American Truck Simulator has had the higher daily player count for the last 24 days — every day since Coilr began tracking both games.
Days tracked
24
Current streak
24 days
American Truck Simulator
Lead changes
0
Closest gap
49%
Jul 27, 2026
How this works: each game's daily average concurrent players (from Coilr's 10-minute Steam polls), compared on the 24 days where both games have data — whichever averages higher leads that day. methodology
| Metric | American Truck Simulator | Undertale |
|---|---|---|
| Players right now | 5,180 | 3,730 |
| 24-hour peak | 10,728 | 4,976 |
| 7-day average | 6,784 | 3,192 |
| 30-day average | 7,253 | 2,856 |
| 30-day trend | — | +57% |
| Peak (tracked) | 10,789 | 4,976 |
| Steam reviews | 97% positive | 97% positive |
| Recent reviews (3 mo) | 97% positive | 97% positive |
| Total reviews | 194,274 | 331,420 |
| Owners (SteamSpy est.) | ~2,000,000 | ~5,000,000 |
| Release date | Feb 2, 2016 | Sep 15, 2015 |
| Price | $19.99 | $2.49 (−75%) |
Full stats: American Truck Simulator · Undertale · add more games to this comparison →
| Month | American Truck Simulator | Undertale | ||
|---|---|---|---|---|
| Avg | Peak | Avg | Peak | |
| Apr 2026 | 8,398 | 9,631 | 1,028 | 1,458 |
| May 2026 | — | — | 951 | 1,373 |
| Jun 2026 | — | — | 1,950 | 3,530 |
| Jul 2026 (so far) | 7,162 | 10,789 | 2,887 | 4,976 |
Monthly average and peak concurrent players on Steam, from Coilr's own tracking (10-minute polls, hourly beyond 30 days).
American Truck Simulator currently has more players: 5,180 concurrent players on Steam vs 3,730 for Undertale — about 39% more players.
Over the last 30 days American Truck Simulator averaged 7,253 concurrent players and Undertale averaged 2,856. By that measure American Truck Simulator is currently the bigger game.
Not in Coilr's head-to-head tracking: American Truck Simulator has had the higher daily average concurrent player count on Steam on every one of the 24 days both games have been tracked.
By Steam review score, American Truck Simulator rates higher: 97% positive across 194,274 reviews vs 97% across 331,420 for Undertale. American Truck Simulator has the larger player base right now (5,180 vs 3,730 concurrent). Player counts, ratings, price and trend are compared side by side above.
Undertale averaged 2,856 concurrent players over the last 30 days, up 57% vs the previous 30 days. Its highest tracked player count is 4,976.