Case study · publicly documented
Justin Sandercoe has taught guitar for free on the internet since 2006. The app that turned that into a business was built and is run by a software company — and that is the arrangement working as intended, not a compromise he settled for.
JustinGuitar started as free lessons on YouTube in 2006 and never stopped being free. His own site today counts 1,341 free guitar lessons, 794 song tutorials and 1,091,752 registered students — live counters on his homepage, sitting directly under the line “JustinGuitar is trusted by millions of students worldwide.”
In 2010 The Independent wrote that Sandercoe is “a man who can reasonably claim to be the one of the most influential guitar teachers in history.” We quote the hedge because he wrote it that way and almost every retelling since has flattened it into a flat declaration. It didn’t need flattening: a million registered students is the claim.
Open the App Store listing for Justin Guitar Lessons & Songs and read the developer field. It does not say Justin Sandercoe. It says Musopia — a Finnish software company — and Apple prints the same name in three separate places on that one page: the developer row, the seller row in Information, and the App Privacy sentence.
This is the part most teachers get wrong when they imagine building an app. They assume the choice is learn to code or stay small. He took the third option: he found a software partner, kept teaching, and let his name sit on a product somebody else builds and operates. The listing has been live since December 2016 and shipped its most recent version on 31 July 2026.
The app holds 4.8 stars across 25,899 ratings and sells at $8.99 a month or $64.99 a year for full access. Nearly ten years of a paid product running alongside a free library that never shrank — the free lessons did not cannibalise it, they fed it.
What he kept
What he handed over
What people pay for here is not new content. It is 210 recorded video lessons, a ten-minute daily practice routine, a chord-change exercise, a tuner, and a record of where you got to. Not one of those depends on what he films next week. That is the honest version of “an app keeps earning” — the product stops needing new material, but it never stops needing someone to keep it working.
And the number required is smaller than it looks. At his entry price, after Apple’s 15% small-business rate, each subscriber nets about $7.64 a month. A hundred thousand dollars a year is 1,091 subscribers — one tenth of one percent of his registered students. We are not claiming that is what he earns; we have no idea, and nobody publishes it. It is arithmetic about the price, and it is the honest substitute for an estimate.
The part worth copying is the structure. Somebody has to write the software and somebody has to keep shipping it after launch, and it was never going to be the guitar teacher. He found the somebody. That is the whole job of a creator app studio, and it is visible on Apple’s own page rather than in anyone’s pitch deck.
Sources: US App Store listing for Justin Guitar Lessons & Songs (developer and seller fields, ratings, release and update dates, in-app purchase pricing, feature list) and justinguitar.com’s own homepage counters, read 11–13 August 2026; The Independent, 16 February 2010. No revenue figure is claimed here because none is public. Not affiliated with Justin Sandercoe, JustinGuitar or Musopia.
The model, without the legwork
We build the app around your method and operate it with you, so there’s no six-figure upfront build bill and no software team to manage. You keep teaching.