How many copies did SAS: Zombie Assault 4 sell?

331k to 538k copies, based on its 10k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did SAS: Zombie Assault 4 make?

SAS: Zombie Assault 4 is free to play, so there is no copy-sales revenue to estimate.

How big is SAS: Zombie Assault 4?

Estimated owners: ≈ 331k–538k; from 10k reviews (Very Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left SAS: Zombie Assault 4 out and predicted the genre from its 8 similar games. Every figure here, including SAS: Zombie Assault 4's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 7.8M–15.0M

best case 40.0M (Wallpaper Engine)

The FPS genre

All 8 of your similar games are hits. A big, proven genre for a game like yours.

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

A typical game

≈ 7.8M–15.0M copies

≈ $71.8M–$86.5M after Steam's cut

from ~211k reviews

Best case

≈ 30.5M–49.6M copies

Wallpaper Engine · ≈ $41.9M–$112.5M after Steam's cut

The genre you'd be entering

Your set: Your set clusters on FPS (6 of 8) and Open World (4 of 8).
The winners: Winners here lead with Mature + Utilities, priced around $5.
The era: None of the games you compared shipped in the last two years; the newest is from 2020. That says more about your picks than about the market, so add newer similar games to read the timing.

Copies and revenue are rough lifetime estimates from the review count.

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
theHunter: Call of the Wild™ 2017	Est. copies ≈ 6.9M–11.2M SteamSpy 5M–10M	Est. revenue $37.9M–$102.0M after Steam's cut $69.0M–$156.9M before the cut	$19.99	201k reviews Very Positive	HuntingOpen World
Z1 Battle Royale 2018	Est. copies ≈ 6.2M–10.0M SteamSpy 10M–20M	Est. revenue Free	Free	203k reviews Mixed	SurvivalMassively Multiplayer
Hunt: Showdown 1896 2019	Est. copies ≈ 7.9M–12.9M SteamSpy 10M–20M	Est. revenue $65.5M–$176.1M after Steam's cut $119.1M–$270.9M before the cut	$29.99	276k reviews Mostly Positive	Open WorldExtraction Shooter
DOOM 2016	Est. copies ≈ 8.8M–14.3M SteamSpy 5M–10M	Est. revenue $48.3M–$130.0M after Steam's cut $87.9M–$200.0M before the cut	$19.99	220k reviews Overwhelmingly Positive	FPSGore
Black Mesa 2020	Est. copies ≈ 3.8M–6.2M SteamSpy 2M–5M	Est. revenue $20.9M–$56.1M after Steam's cut $37.9M–$86.3M before the cut	$19.99	144k reviews Very Positive	FPSRemake
Wallpaper Engine 2018	Est. copies ≈ 30.5M–49.6M 4.8x vs typical SteamSpy 20M–50M	Est. revenue $41.9M–$112.5M after Steam's cut $76.1M–$173.1M before the cut	$4.99	1.0M reviews Overwhelmingly Positive	MatureUtilities
Unturned 2017	Est. copies ≈ 19.4M–31.5M 2.7x vs typical SteamSpy 50M–100M	Est. revenue Free	Free	564k reviews Very Positive	Free to PlaySurvival
Killing Floor 2 2016	Est. copies ≈ 5.2M–8.4M SteamSpy 2M–5M	Est. revenue $42.6M–$114.5M after Steam's cut $77.4M–$176.2M before the cut	$29.99	129k reviews Very Positive	ZombiesMultiplayer