Independent automated assessment · 3 signal sources · 503 reviews scanned · analyzed 2026-10-05.
4.8 ★24,968 ratings
—Downloads
17+Age rating
590 MBApp size
Free · In-app purchasesIn-app purchases
About this app
The smart amp and app that jam along with you using intelligent technology. Play and practice with millions of songs and access over 10,000 tones powered by our award-winning BIAS tone engine.
*Auto Chords* Automatically display chords for millions of songs. Choose any song, and Spark will auto display its chords in real-time as you play. Easy controls let you slow down the song’s tempo or loop a difficult section as you master playing it.
*Smart Jam* The Spark amp and app work together to learn your style and feel, and then generate authentic bass and drums to accompany you. It’s a smart virtual band that goes wherever you go!
*Voice Command* The Spark app responds to your voice commands. Tell it to stream a rock song or a blues backing track, or ask for a virtual band to follow your playing.…
Preview
Real screenshots from the store listing.
Independent evidence report
Evidence and review signals
This is where the page changes from an app-store listing into an evidence report: findings, important reviews, pricing and a dated history.
Which version this describes
When we ran this analysis, and what the store lists now.
This analysis describes version 4.6.2 of the app, analyzed 2026-10-05 . The app may have changed since.
The store currently lists version 4.6.2, updated 2026-09-17.
What we measured
Each line is a measurement published as a measurement, never a verdict.
Each line is a measurement, published as a measurement. Where we have not looked, the line says so rather than reading as a zero.
Developer replies to reviews
Replies to fewer than 1 review in 20
Price in the store description
States no price and billing period
Cancelling, in the store description
Does not say how to cancel
Themes reported by reviewers
No theme reported
Counted from the reviews we have read for this app. "No theme reported" means no theme reached our reporting threshold — it is not a finding that nothing is wrong with this app, and we do not say it is.
Five-star share of ratings
80–89% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.
In the package we scanned
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence about the app, not a finding about it.
Graded bands · predicate set 1.4 · how these are measured
What the analysis found
App-specific findings, grouped by what each one rests on. How they are graded lives on its own page.
One source only — shown, not confirmed 1
A single kind of evidence. We publish these because withholding them would be the bigger distortion, and we do not treat any of them as a finding we stand behind.
From the store listing: Usable without an account
The app's own screens offer a way past sign-up — guest access, skipping, or browsing before registering — rather than gating the product behind an account. The store's privacy disclosure is checked alongside it: that disclosure is self-reported, so it corroborates this credit rather than establishing it.
What we saw: The store privacy disclosure (2 entries) links no contact details or identifiers to the user — consistent with an app that does not require an account. Self-reported by the developer.
Assessment & version history
App changes and Appworthy events in one timeline.
What this app sells
Useful store-disclosed pricing, kept below the app listing.
Items shown1
Lowest$19.99
Highest$19.99
Experience Jimi Hendrix™$19.99