How many copies did Zombie Defense sell?

91k to 147k copies, based on its 2k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Zombie Defense make?

Zombie Defense is free to play, so there is no copy-sales revenue to estimate.

How big is Zombie Defense?

Estimated players who have it: ≈ 91k–147k; from 2k reviews (Very Positive)

Copies are estimated from the public review count, adjusted for release year, and cross-checked against SteamSpy's own estimate.

Did the prediction match what actually happened?

We hid Zombie Defense and predicted how it would do from its 8 similar games. Every figure here, including Zombie Defense's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 74k–156k

best case 13.1M (7 Days to Die)

Games like Zombie Defense

A typical game among these

≈ 74k–156k copies

≈ $259k–$301k after Steam's cut

from ~2k reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

All 8 of the similar games are hits.

Best case: 7 Days to Die at ≈ 9.9M–16.2M copies, ≈ $123.1M–$331.0M after Steam's cut. It is a breakout hit, far above a typical game.

What their first month looked like

About half the games that made it here had over 1k reviews in their first month; the range was 319 to 327k.

The genre you'd be entering

These games: The similar games share Zombies (8 of 8) and Survival (5 of 8).
The winners: Winners here lead with Zombies, priced around $30.
When they shipped: The similar games span 2009 to 2024, and 2 of the 8 shipped in the last two years.

How these numbers were worked out

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

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Ultimate Zombie Defense 2020	Est. copies ≈ 119k–194k 2.1x vs typical SteamSpy 200k–500k	Est. revenue $163k–$439k after Steam's cut $297k–$676k before Steam's cut	$4.99	5k reviews Very Positive	ActionCasual
They Are Billions 2019	Est. copies ≈ 1.5M–2.4M 23x vs typical SteamSpy 2M–5M	Est. revenue $12.2M–$32.9M after Steam's cut $22.2M–$50.6M before Steam's cut	$29.99	52k reviews Very Positive	Base-BuildingColony Sim
Dread Dawn 2024	Est. copies ≈ 56k–92k SteamSpy 50k–100k	Est. revenue $310k–$834k after Steam's cut $564k–$1.3M before Steam's cut	$19.99	2k reviews Mostly Positive	ZombiesSurvival
Yet Another Zombie Defense HD 2017	Est. copies ≈ 128k–208k 1.6x vs typical SteamSpy 200k–500k	Est. revenue $140k–$377k after Steam's cut $255k–$580k before Steam's cut	$3.99	4k reviews Very Positive	ZombiesTop-Down Shooter
Deadly 30 2014	Est. copies ≈ 105k–171k SteamSpy 100k–200k	Est. revenue $144k–$388k after Steam's cut $262k–$597k before Steam's cut	$4.99	2k reviews Mostly Positive	ActionIndie
Plants vs. Zombies GOTY Edition 2009	Est. copies ≈ 9.9M–16.1M 69x vs typical SteamSpy 2M–5M	Est. revenue $13.6M–$36.5M after Steam's cut $24.7M–$56.1M before Steam's cut	$4.99	156k reviews Overwhelmingly Positive	Tower DefenseZombies
Grim Nights 2018	Est. copies ≈ 47k–77k SteamSpy 100k–200k	Est. revenue $39k–$104k after Steam's cut $71k–$160k before Steam's cut	$2.99	2k reviews Very Positive	StrategyTower Defense
7 Days to Die 2024	Est. copies ≈ 9.9M–16.2M 176x vs typical SteamSpy 10M–20M	Est. revenue $123.1M–$331.0M after Steam's cut $223.8M–$509.2M before Steam's cut	$44.99	401k reviews Very Positive	SurvivalZombies