How much revenue did Iron Sea Defenders make?

$58k–$157k after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Iron Sea Defenders sell?

Q: How many copies did Iron Sea Defenders sell?

14k to 23k copies, based on its 340 Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 14k–23k; $58k–$157k after Steam's cut $106k–$241k before Steam's cut; from 340 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 Iron Sea Defenders and predicted how it would do from its 8 similar games. Every figure here, including Iron Sea Defenders's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 745k–1.4M

best case 13.1M (7 Days to Die)

Games like Iron Sea Defenders

A typical game among these

≈ 745k–1.4M copies

≈ $3.5M–$8.8M after Steam's cut

from ~21k 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 Base-Building (5 of 8) and Building (4 of 8).
The winners: Winners here lead with Survival + Zombies, priced around $45. The breakout hits carry Zombies + Multiplayer + Open World; a typical game here doesn't.
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
Mountain 2014	Est. copies ≈ 912k–1.5M SteamSpy 500k–1M	Est. revenue $248k–$668k after Steam's cut $452k–$1.0M before Steam's cut	$0.99	16k reviews Very Positive	SimulationIndie
Kingdoms and Castles 2017	Est. copies ≈ 1.1M–1.8M SteamSpy 1M–2M	Est. revenue $6.0M–$16.0M after Steam's cut $10.8M–$24.6M before Steam's cut	$19.99	32k reviews Very Positive	City Builder Colony Sim
The Riftbreaker 2021	Est. copies ≈ 619k–1.0M SteamSpy 1M–2M	Est. revenue $5.1M–$13.7M after Steam's cut $9.3M–$21.1M before Steam's cut	$29.99	25k reviews Very Positive	Base-BuildingTower Defense
Kingdom: Classic 2015	Est. copies ≈ 1.1M–1.8M SteamSpy 2M–5M	Est. revenue Free	Free	23k reviews Very Positive	Free to PlayStrategy
Kingdom: New Lands 2016	Est. copies ≈ 516k–839k SteamSpy 1M–2M	Est. revenue $2.1M–$5.7M after Steam's cut $3.9M–$8.8M before Steam's cut	$14.99	12k reviews Very Positive	Tower Defense Survival
Stronghold Crusader HD (2012) 2013	Est. copies ≈ 1.3M–2.2M SteamSpy 1M–2M	Est. revenue $3.7M–$9.9M after Steam's cut $6.7M–$15.2M before Steam's cut	$9.99	21k reviews Overwhelmingly Positive	MilitaryCity Builder
Bad North: Jotunn Edition 2018	Est. copies ≈ 436k–709k SteamSpy 500k–1M	Est. revenue $1.8M–$4.8M after Steam's cut $3.3M–$7.4M before Steam's cut	$14.99	14k reviews Very Positive	WargameVikings
7 Days to Die 2024	Est. copies ≈ 9.9M–16.2M 19x 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