How many copies did Space Travel Idle sell?

An estimated 14k to 23k copies, based on its 540 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Space Travel Idle make?

Space Travel Idle is free to play, so there is no copy-sales revenue to estimate.

How big is Space Travel Idle?

Estimated owners: ≈ 14k–23k; from 540 reviews (Mixed)

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 Space Travel Idle out and predicted the genre from its 8 similar games. Every figure here, including Space Travel Idle's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 1.2M–2.3M

best case 8.2M (Slay the Spire)

The Strategy lane

A big, proven genre: most sell around 1.7M copies.

A typical game

≈ 1.7M copies

≈ $16.3M after Steam's cut

from ~49k reviews

Best case

≈ 8.2M copies

Slay the Spire · ≈ $78.8M after Steam's cut

from 216k reviews

7 of your 8 games sit in the typical range; 1 is too small to compare.

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Roguelike Deckbuilder + Card Game, priced around $25.
The games you compared span 2019 to 2026, a lane with a long track record.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

Game	Price	Reviews	Tags	Est. copies	Est. revenue
Minion Masters 2019	Est. copies ≈ 1.9M–3.1M SteamSpy 500k–1M	Est. revenue Free	Free	65k reviews Very Positive	PvETrading Card Game +6
KARDS - The WW2 Card Game 2020	Est. copies ≈ 1.3M–2.1M SteamSpy 2M–5M	Est. revenue Free	Free	49k reviews Mixed	Free to PlayCard Game +6
Library Of Ruina 2021	Est. copies ≈ 1.1M–1.7M SteamSpy 1M–2M	Est. revenue $8.9M–$23.8M net $16.1M–$36.6M gross	$29.99	43k reviews Very Positive	Story RichCard Game +6
觅长生 2023	Est. copies ≈ 758k–1.2M SteamSpy 1M–2M	Est. revenue $3.1M–$8.4M net $5.7M–$12.9M gross	$14.99	32k reviews Very Positive	RPGOpen World +6
Slay the Spire 2019	Est. copies ≈ 6.2M–10.1M 4.4x vs typical SteamSpy 5M–10M	Est. revenue $42.7M–$114.9M net $77.7M–$176.7M gross	$24.99	216k reviews Overwhelmingly Positive	Roguelike DeckbuilderCard Game +6
Stormworks: Build and Rescue 2020	Est. copies ≈ 1.6M–2.5M SteamSpy 1M–2M	Est. revenue $10.7M–$28.8M net $19.5M–$44.3M gross	$24.99	59k reviews Very Positive	SandboxBase-Building +6
Rogue Voltage 2026	Est. copies ≈ 15k–24k too small to compare SteamSpy 0–20k	Est. revenue $66k–$177k net $120k–$273k gross	$15.99	625 reviews Very Positive	Early AccessDeckbuilding +6
Drunken Wrestlers 2 2019	Est. copies ≈ 538k–874k SteamSpy 500k–1M	Est. revenue $590k–$1.6M net $1.1M–$2.4M gross	$3.99	19k reviews Very Positive	Early AccessMultiplayer +6