How many copies did Alien Swarm: Reactive Drop sell?

819k to 1.3M copies, based on its 24k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Alien Swarm: Reactive Drop make?

Alien Swarm: Reactive Drop is free to play, so there is no copy-sales revenue to estimate.

How big is Alien Swarm: Reactive Drop?

Estimated players who have it: ≈ 819k–1.3M; from 24k 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 Alien Swarm: Reactive Drop and predicted how it would do from its 8 similar games. Every figure here, including Alien Swarm: Reactive Drop's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 61k–124k

best case 813k (The Ascent)

Games like Alien Swarm: Reactive Drop

A typical game among these

≈ 61k–124k copies

≈ $222k–$523k 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: The Ascent at ≈ 619k–1.0M copies, ≈ $5.1M–$13.7M 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 742 reviews in their first month; the range was 575 to 9k.

The genre you'd be entering

These games: The similar games share Rogue-lite (5 of 8) and Shooter (5 of 8).
The winners: Winners here lead with Top-Down Shooter + Cyberpunk, priced around $30. The breakout hits carry Cyberpunk + RPG + Co-op; a typical game here doesn't.
When they shipped: The similar games span 2006 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
Skillshot City 2017	Est. copies ≈ 123k–201k 1.9x vs typical SteamSpy under 20k	Est. revenue Free	Free	4k reviews Very Positive	Battle RoyaleRogue-lite
The Ascent 2021	Est. copies ≈ 619k–1.0M 13x vs typical 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 Mostly Positive	Top-Down ShooterCyberpunk
Shadowgrounds 2006	Est. copies ≈ 103k–167k SteamSpy 200k–500k	Est. revenue $197k–$530k after Steam's cut $359k–$816k before Steam's cut	$6.99	2k reviews Very Positive	Top-Down ShooterSci-fi
Hell is Others 2022	Est. copies ≈ 29k–47k SteamSpy 500k–1M	Est. revenue $119k–$319k after Steam's cut $216k–$491k before Steam's cut	$14.99	1k reviews Mostly Positive	Rogue-likeTop-Down
SYNTHETIK 2 2021	Est. copies ≈ 87k–141k 1.9x vs typical SteamSpy 500k–1M	Est. revenue $476k–$1.3M after Steam's cut $866k–$2.0M before Steam's cut	$19.99	3k reviews Very Positive	Early AccessRogue-lite
Touhou Endless Dream 2021	Est. copies ≈ 47k–76k SteamSpy under 20k	Est. revenue $103k–$276k after Steam's cut $187k–$425k before Steam's cut	$7.99	2k reviews Very Positive	CasualAnime
Blazing Beaks 2019	Est. copies ≈ 76k–123k SteamSpy under 20k	Est. revenue $312k–$839k after Steam's cut $567k–$1.3M before Steam's cut	$14.99	3k reviews Very Positive	Pixel GraphicsAction Roguelike
NIMRODS 2024	Est. copies ≈ 46k–74k SteamSpy 200k–500k	Est. revenue $126k–$337k after Steam's cut $228k–$519k before Steam's cut	$9.99	2k reviews Very Positive	Early Access2D