How much revenue did Summer Islands make?

$20k–$54k after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Summer Islands sell?

Q: How many copies did Summer Islands sell?

5k to 8k copies, based on its 197 Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 5k–8k; $20k–$54k after Steam's cut $37k–$83k before the cut; from 197 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 Summer Islands out and predicted the genre from its 8 similar games. Every figure here, including Summer Islands's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 493k–919k

best case 1.0M (Dwarf Fortress)

Games like Summer Islands

The middle of these games

≈ 493k–919k copies

≈ $4.5M–$12.3M after Steam's cut

from ~18k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

Best case: Dwarf Fortress at ≈ 780k–1.3M copies, ≈ $6.4M–$17.3M after Steam's cut.

What it took to get here

About half the games that made it here had over 16k reviews in their first month; the spread ran 1k to 21k.

The genre you'd be entering

Your set: Your set clusters on Sandbox (7 of 8) and City Builder (5 of 8).
The winners: Winners here lead with Dwarf + Colony Sim, priced around $30.
The era: The games you compared span 2015 to 2026, and 2 of your 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 61 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
Software Inc. 2015	Est. copies ≈ 381k–619k SteamSpy 100k–200k	Est. revenue $2.4M–$6.5M after Steam's cut $4.4M–$10.0M before the cut	$22.99	8k reviews Very Positive	Early AccessManagement
X4: Foundations 2018	Est. copies ≈ 911k–1.5M 1.7x vs typical SteamSpy 1M–2M	Est. revenue $12.5M–$33.7M after Steam's cut $22.8M–$51.8M before the cut	$49.99	30k reviews Mostly Positive	Space SimSimulation
Avorion 2020	Est. copies ≈ 361k–586k SteamSpy 500k–1M	Est. revenue $2.5M–$6.7M after Steam's cut $4.5M–$10.3M before the cut	$24.99	15k reviews Very Positive	ExplorationSandbox
Dwarf Fortress 2022	Est. copies ≈ 780k–1.3M 1.8x vs typical SteamSpy 2M–5M	Est. revenue $6.4M–$17.3M after Steam's cut $11.7M–$26.6M before the cut	$29.99	31k reviews Very Positive	DwarfColony Sim
Going Medieval 2026	Est. copies ≈ 529k–860k SteamSpy 500k–1M	Est. revenue $4.4M–$11.7M after Steam's cut $7.9M–$18.1M before the cut	$29.99	21k reviews Very Positive	RPGEarly Access
Transport Fever 2016	Est. copies ≈ 451k–733k SteamSpy 1M–2M	Est. revenue $3.7M–$10.0M after Steam's cut $6.8M–$15.4M before the cut	$29.99	11k reviews Very Positive	FlightCity Builder
Kingdoms Reborn 2020	Est. copies ≈ 241k–391k SteamSpy 500k–1M	Est. revenue $1.3M–$3.6M after Steam's cut $2.4M–$5.5M before the cut	$19.99	10k reviews Very Positive	City BuilderBase-Building
Workers & Resources: Soviet Republic 2024	Est. copies ≈ 673k–1.1M 1.5x vs typical SteamSpy 500k–1M	Est. revenue $7.4M–$19.9M after Steam's cut $13.5M–$30.6M before the cut	$39.99	27k reviews Very Positive	StrategySimulation