How many people are playing Cepheus Protocol right now?

43 people are playing Cepheus Protocol on Steam right now, making it the 3870th most played game on Steam. In the last 24 hours it peaked at 72 players. The number updates every few minutes.

What is Cepheus Protocol's all-time peak player count?

Cepheus Protocol's highest concurrent player count on Steam is 378, reached in October 2021.

Is Cepheus Protocol good? What do Steam reviews say?

76% of 3,019 Steam user reviews are positive (Mostly Positive).

How much does Cepheus Protocol cost on Steam?

Cepheus Protocol costs $19.99 on Steam (US).

Does Cepheus Protocol work on Steam Deck?

Cepheus Protocol is Playable on Steam Deck (with small issues), according to Valve's Steam Deck compatibility check.

Cepheus Protocol

by Halcyon Winds · Released May 15, 2020

Steam Deck PlayableLinux & Deck: Silver

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Players now

#3,870

▼ 35.8%vs 24h ago · updates every minute

Review score

76% positive

Mostly Positive3,019 reviews

Owners (est.)200K–500K

24h peak

Highest seen378

Oct 20215.1 years ago

Price on Steam

$19.99

Lowest ever $19.99 Nov 2026

RisingSteadyFalling

Players -35.8% in the last 24 hoursUpdated 15:40 UTC · tracking since 2020-05-01

Concurrent players

Last 7 days

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Players onlineSteam sale started

Media & details

Screenshots, achievements, specs and price history from Steam.

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Where to buy

Steam prices for United States (change the country in the top bar), and Steam keys from authorized stores.

Steam Official

Prices update every 6 hours

$19.99

Buy

Other authorized stores

No authorized Steam key store lists this game right now.

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Editions and bundles on Steam

Cepheus ProtocolEdition
$19.99
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Bundles with this game (2), biggest discount first

Upgrade to "Supporter Edition"Bundle
$28.46
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Cepheus Protocol Origins EditionBundle
$35.05
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Reviews

76% positive of 3,019 · Mostly Positive · Live from Steam

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Steam Deck

Works, but may need extra effort. Results from Valve's own testing.

Steam Deck Playable

!Default controller config not fully functional
!Text input does not automatically invokes keyboard
!Interface text is not legible
!Default configuration is not performant
✓Default controller config fully functional
✓Controller glyphs match deck device

Steam Deck

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Patches & builds

Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.

Aug 20, 2026, 4:25 AM UTC
Build 24829887the current build when we started tracking12 GB on Windows

Betas and other versions (2)

Oct 31, 2026, 1:34 PM UTC
experimental · build 26343574
Preview build with new features. Unstable, frequent updates, saves may break.
Jan 7, 2026, 3:05 AM UTC
legacy · build 20415865
The branch before we merged the rebuilt game as default on 1.6.25

Patch notes

Sep 4, 2026
Patch2026.9.4 Experimental Patch Notes & September Development Update
THE BAY AREA IS COLLAPSING. The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field.Embedded military repo…
Aug 21, 2026
Patch2026.8.21.1 Experimental Patch Notes & August Development Update
THE BAY AREA IS COLLAPSING. The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field.Embedded military repo…
Aug 5, 2026
Patch2026.8.4.1 + 4.2 Experimental and Normal Patch Notes
THE BAY AREA IS COLLAPSING. The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field. Embedded military rep…
Aug 1, 2026
Patch2026.7.31.3 Quality of Life Update Live + GPU Fog of War Tonight on Experimental
THE BAY AREA IS COLLAPSING. The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field. Embedded military rep…
Jul 12, 2026
Patch2026.7.11 AI, Performance & Helicopter Systems Update on Experimental
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in the field.Embedded military reporters and frontline operato…
May 31, 2026
Patch2026.5.30.6.2 : Hotfix
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in the field.Embedded military reporters and frontline operato…

Other news (14)

Aug 13, 2026
2026.8.13.1 Now Out: Final Push to Escalation
THE BAY AREA IS COLLAPSING. The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field. Embedded military rep…
Jul 28, 2026
2026.7.27 CERC OPS Arrives on Experimental Plus Major Fixes
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in the field.Embedded military reporters and frontline operato…
Jul 24, 2026
World Reveal of CERC Ops This Saturday!
A New Way to Monitor the Battlefield This Saturday, during the 100th episode of CERC HQ, we will hold the world reveal of CERC Ops, a new tactical companion built specifically for Cepheus Protocol. CERC Ops connects directly to an active game session and provi…
Jul 20, 2026
Massive Performance Gains and Smarter Fog of War Are Coming
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in the field. Embedded military reporters and frontline opera…
Jun 20, 2026
2026.6.19.5 Discord Integration Fixes + Launcher
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in the field.Embedded military reporters and frontline operato…
Jun 19, 2026
2026.6.18.2 Weather System, Discord, Vehicles, and Pandemic Fixes

Patches & builds

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History

What changed on Steam for this game since we started following it: prices and sales, builds, name, release date and review score.

Review score: 76% on 2026-11-01 → 76% today (3,019 reviews)

Nov 1, 2026Price$19.99

History

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DLC

7 items on Steam, newest first.

Cepheus Protocol - The Last Line Novella
$3.99100% positive
Cepheus Protocol - Free Vehicle Camo Post Modern Collection
Free87% positive
Cepheus Protocol - Support Pack Vehicle Camo Classic Wars Collection
$2.99100% positive
Cepheus Protocol - Support Pack Vehicle Camo Modern Collection
$2.99100% positive
Cepheus Protocol - Support Pack Vehicle Camo NATO Collection
$3.99100% positive
Cepheus Protocol Digital Art Book
$4.99100% positive
Cepheus Protocol Novelization
$4.99100% positive

DLC

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Trading cards

This game has Steam Trading Cards. We're pricing the set now; check back in a few minutes.

Trading cards

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