The Callisto Protocol
Live player count and Steam charts
Survive to escape the horrors of Callisto and uncover the dark secrets of Jupiter’s dead moon.
Player history
Each point is the highest number of players online in that month (UTC). History before July 14, 2026 is imported; everything after is our own readings. Zoom in for finer detail.
Monthly player counts
| Month | Avg players | Gain | % gain | Peak |
|---|---|---|---|---|
| Jul 2026 * | 81 | -23 | -22.1% | 263 |
| Jun 2026 | 104 | +52 | +100.0% | 398 |
| May 2026 | 52 | -2 | -3.7% | 115 |
| Apr 2026 | 54 | -4 | -6.9% | 133 |
| Mar 2026 | 58 | -11 | -15.9% | 125 |
| Feb 2026 | 69 | -19 | -21.6% | 165 |
| Jan 2026 | 88 | -22 | -20.0% | 191 |
| Dec 2025 | 110 | +27 | +32.5% | 326 |
| Nov 2025 | 83 | -24 | -22.4% | 180 |
| Oct 2025 | 107 | -42 | -28.2% | 302 |
| Sep 2025 | 149 | +15 | +11.2% | 559 |
| Aug 2025 | 134 | -24 | -15.2% | 616 |
* current month, data so far
When people play
Average concurrent players by day and hour over the last 15 days, shown in .
Daily activity peaks around 19:00 — a pattern consistent with a player base concentrated in Europe, the Middle East & Africa. Steam publishes no per-country player data, so this is inferred from play times.
Audience
Language mix of 100 Steam reviews spanning 13 days — a rough proxy for where the player base is.
Achievements
Every achievement in the game, ordered from most to least earned (#1 is the one the most players have). Height is the share of all players who have it; the dashed line is the median. Global rates from Steam.
