How many copies did Zombie Builder Defense sell?

16k to 25k copies, based on its 513 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Zombie Builder Defense make?

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

How big is Zombie Builder Defense?

Estimated players who have it: ≈ 16k–25k; from 513 reviews (Mixed)

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

Copies, estimated from reviews

typical (middle half) 574k–845k

best case 13.1M (7 Days to Die)

Games like Zombie Builder Defense

A typical game among these

≈ 574k–845k copies

≈ $3.2M–$4.6M after Steam's cut

from ~13k 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.

The genre you'd be entering

These games: The similar games share Survival (8 of 8) and Base-Building (7 of 8).
The winners: Winners here lead with Base-Building + Zombies, priced around $30.
When they shipped: The similar games span 2013 to 2024, and 1 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
Colony Survival 2017	Est. copies ≈ 310k–504k SteamSpy 200k–500k	Est. revenue $2.1M–$5.7M after Steam's cut $3.9M–$8.8M before Steam's cut	$24.95	9k reviews Very Positive	Colony Sim Survival
They Are Billions 2019	Est. copies ≈ 1.5M–2.4M 3.9x 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
How to Survive 2 2016	Est. copies ≈ 458k–745k SteamSpy 500k–1M	Est. revenue $1.9M–$5.1M after Steam's cut $3.4M–$7.8M before Steam's cut	$14.99	11k reviews Mixed	SurvivalZombies
State of Decay 2: Juggernaut Edition 2020	Est. copies ≈ 1.7M–2.8M 5.3x vs typical SteamSpy 2M–5M	Est. revenue $14.3M–$38.6M after Steam's cut $26.1M–$59.3M before Steam's cut	$29.99	70k reviews Very Positive	SurvivalOpen World
State of Decay: YOSE 2015	Est. copies ≈ 644k–1.0M SteamSpy 1M–2M	Est. revenue $3.5M–$9.5M after Steam's cut $6.4M–$14.6M before Steam's cut	$19.99	13k reviews Very Positive	ZombiesSurvival
State of Decay 2013	Est. copies ≈ 1.1M–1.8M SteamSpy 500k–1M	Est. revenue Free	Free	17k reviews Very Positive	ZombiesSurvival
Mist Survival 2018	Est. copies ≈ 437k–711k SteamSpy 500k–1M	Est. revenue $1.3M–$3.6M after Steam's cut $2.4M–$5.5M before Steam's cut	$10.99	14k reviews Mostly Positive	SurvivalZombies
7 Days to Die 2024	Est. copies ≈ 9.9M–16.2M 30x 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