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How many copies did String Theory sell?

Estimated copies sold
≈ 322–524
$1k–$3k after Steam's cut $2k–$5k before Steam's cut
from 13 reviews (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 String Theory and predicted how it would do from its 8 similar games. Every figure here, including String Theory's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 3k–8k
best case 272k (MUSYNX)
Games like String Theory

A typical game among these

≈ 3k–8k copies

≈ $8k–$51k after Steam's cut

from ~107 reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

1 of the 8 similar games is a hit.

Best case: MUSYNX at ≈ 207k–336k copies, ≈ $227k–$610k 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 11 reviews in their first month; the range was 5 to 448.
Games with under about 100 reviews in month one almost never recover.
The genre you'd be entering
These games
The similar games share Rhythm (8 of 8) and Simulation (8 of 8).
The winners
Winners here lead with Rhythm + Music, priced around $4. The breakout hits carry Singleplayer + Anime + Difficult; a typical game here doesn't.
When they shipped
The similar games span 2013 to 2025, 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

Rock Star Life Simulator
2025
Est. copies
≈ 13k–22k
5.0x vs typical
SteamSpy under 20k
Est. revenue
$46k–$124k after Steam's cut $84k–$190k before Steam's cut
$12.49
540 reviews
Very Positive
Life SimMusic
DanSparkling
2023
Est. copies
≈ 645–1k
SteamSpy under 20k
Est. revenue
$3k–$9k after Steam's cut $6k–$13k before Steam's cut
$17.99
26 reviews
Mixed
Early AccessCasual
MUSYNX
2018
Est. copies
≈ 207k–336k
64x vs typical
SteamSpy 200k–500k
Est. revenue
$227k–$610k after Steam's cut $413k–$939k before Steam's cut
$3.99
7k reviews
Very Positive
RhythmMusic
Songs2See
2013
Est. copies
≈ 5k–8k
SteamSpy under 20k
Est. revenue
Free
Free
81 reviews
Mixed
RhythmMusic
Keysight
2020
Est. copies
≈ 3k–4k
SteamSpy under 20k
Est. revenue
$22k–$59k after Steam's cut $40k–$91k before Steam's cut
$29.99
107 reviews
Very Positive
BeautifulMusic-Based Procedural Generation
Melody/心跳旋律
2020
Est. copies
≈ 4k–7k
1.6x vs typical
SteamSpy under 20k
Est. revenue
$5k–$12k after Steam's cut $8k–$19k before Steam's cut
$3.99
168 reviews
Very Positive
MusicRhythm
Beat Aim - Rhythm FPS Trainer
2019
Est. copies
≈ 7k–11k
2.2x vs typical
SteamSpy under 20k
Est. revenue
$28k–$75k after Steam's cut $51k–$115k before Steam's cut
$14.99
234 reviews
Very Positive
Early AccessFPS
Lynium: Play the Rhythm
2020
Est. copies
≈ 2k–3k
SteamSpy under 20k
Est. revenue
Free
Free
73 reviews
Mostly Positive

Sizing up your own game? See how many copies games in its genre usually sell before you build it.