How many copies did Zombie Defense sell?

90k 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 owners: ≈ 90k–147k; from 2k 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 Zombie Defense out and predicted the genre from its 8 similar games. Every figure here, including Zombie Defense's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 74k–156k

best case 13.0M (7 Days to Die)

Games like Zombie Defense

The middle of these games

≈ 74k–156k copies

≈ $253k–$300k after Steam's cut

from ~2k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

Best case: 7 Days to Die at ≈ 9.9M–16.1M copies, ≈ $122.7M–$330.0M after Steam's cut. A breakout hit, far above a typical game.

What it took to get here

About half the games that made it here had over 1k reviews in their first month; the spread ran 320 to 327k.

The genre you'd be entering

Your set: Your set clusters on Zombies (8 of 8) and Survival (5 of 8).
The winners: Winners here lead with Zombies, priced around $30.
The era: The games you compared span 2009 to 2024, and 2 of your 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–193k 2.1x vs typical SteamSpy 200k–500k	Est. revenue $163k–$438k after Steam's cut $296k–$673k before the 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–$32.8M after Steam's cut $22.2M–$50.5M before the cut	$29.99	51k reviews Very Positive	Base-BuildingColony Sim
Dread Dawn 2024	Est. copies ≈ 56k–91k SteamSpy 50k–100k	Est. revenue $309k–$829k after Steam's cut $561k–$1.3M before the cut	$19.99	2k reviews Mostly Positive	ZombiesSurvival
Yet Another Zombie Defense HD 2017	Est. copies ≈ 125k–203k 1.6x vs typical SteamSpy 200k–500k	Est. revenue $137k–$369k after Steam's cut $250k–$568k before the 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–$596k before the cut	$4.99	2k reviews Mostly Positive	ActionIndie
Plants vs. Zombies GOTY Edition 2009	Est. copies ≈ 9.8M–16.0M 69x vs typical SteamSpy 2M–5M	Est. revenue $13.5M–$36.2M after Steam's cut $24.5M–$55.8M before the cut	$4.99	155k reviews Overwhelmingly Positive	Tower DefenseZombies
Grim Nights 2018	Est. copies ≈ 47k–77k SteamSpy 100k–200k	Est. revenue $39k–$104k after Steam's cut $70k–$160k before the cut	$2.99	2k reviews Very Positive	StrategyTower Defense
7 Days to Die 2024	Est. copies ≈ 9.9M–16.1M 177x vs typical SteamSpy 10M–20M	Est. revenue $122.7M–$330.0M after Steam's cut $223.1M–$507.7M before the cut	$44.99	400k reviews Very Positive	SurvivalZombies