How many copies did Endless Sky sell?

328k to 533k copies, based on its 7k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Endless Sky make?

Endless Sky is free to play, so there is no copy-sales revenue to estimate.

How big is Endless Sky?

Estimated owners: ≈ 328k–533k; from 7k 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 Endless Sky out and predicted the genre from its 8 similar games. Every figure here, including Endless Sky's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 4.5M–9.9M

best case 24.9M (Destiny 2)

The Open World genre

All 8 of your similar games are hits. A big, proven genre for a game like yours.

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

A typical game

≈ 4.5M–9.9M copies

≈ $50.5M–$148.1M after Steam's cut

from ~160k reviews

Best case

≈ 19.0M–30.9M copies

Destiny 2

The genre you'd be entering

Your set: Your set clusters on Open World (6 of 8) and Base-Building (3 of 8).
The winners: Winners here lead with Open World + Looter Shooter.
The era: The games you compared span 2012 to 2021, a genre with a long track record.

Copies and revenue are rough lifetime estimates from the review count.

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Stormworks: Build and Rescue 2020	Est. copies ≈ 1.6M–2.5M SteamSpy 1M–2M	Est. revenue $10.7M–$28.9M after Steam's cut $19.5M–$44.5M before the cut	$24.99	59k reviews Very Positive	SandboxBase-Building
RimWorld 2018	Est. copies ≈ 7.4M–12.0M 1.5x vs typical SteamSpy 5M–10M	Est. revenue $71.1M–$191.2M after Steam's cut $129.3M–$294.2M before the cut	$34.99	243k reviews Overwhelmingly Positive	Colony SimBase-Building
ASTRONEER 2019	Est. copies ≈ 4.0M–6.5M SteamSpy 2M–5M	Est. revenue $32.9M–$88.6M after Steam's cut $59.9M–$136.3M before the cut	$29.99	139k reviews Very Positive	MultiplayerOpen World
Stellaris 2016	Est. copies ≈ 7.8M–12.7M SteamSpy 2M–5M	Est. revenue $107.8M–$290.0M after Steam's cut $196.1M–$446.1M before the cut	$49.99	196k reviews Very Positive	SpaceGrand Strategy
Destiny 2 2019	Est. copies ≈ 19.0M–30.9M 4.1x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	660k reviews Mostly Positive	Free to PlayOpen World
PlanetSide 2 2012	Est. copies ≈ 3.9M–6.3M SteamSpy 5M–10M	Est. revenue Free	Free	75k reviews Very Positive	Free to PlayFPS
STAR WARS™: The Old Republic™ 2020	Est. copies ≈ 2.0M–3.2M SteamSpy 5M–10M	Est. revenue Free	Free	75k reviews Very Positive	Free to PlayMultiplayer
Halo Infinite 2021	Est. copies ≈ 4.5M–7.3M SteamSpy 10M–20M	Est. revenue Free	Free	181k reviews Mixed	Free to PlayFPS