Comparison

Altar D vs ToneLens

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Altar D

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Altar AR is an application for viewing 3D objects in AR which in future updates of the application you will be able to import existing NTF objects into your metaverse, place them on the Altar and view in augmented reality. It will also be possible to exchange, sell and transfer NTF rights in augmented reality using devices that support AR (ARcore + ARkit).

About

ToneLens

Features
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ToneLens listens to music playing around you and instantly detects chords, key, and scale, displaying everything in real time on an interactive guitar fretboard. Whether you're jamming along to your favorite songs, learning new progressions, or improvising solos, ToneLens is your real-time companion. REAL-TIME CHORD DETECTION Play any music nearby, a speaker, a friend's guitar, a song on your phone. ToneLens uses your microphone to analyze the audio as it plays. No internet needed. Everything happens on your device, instantly. KNOW WHERE TO PLAY Notes light up on the fretboard exactly where your fingers should go. Five display modes adapt to your level: - Chord: The shape under your fingers, on the fretboard - Pentatonic: The 5 notes that always work - Triad: The three notes of the chord - CAGED: Box positions with ghost strings - Scale: Full scale with chord tones emphasized PREDICT THE NEXT CHORD See what's coming before it happens. ToneLens analyzes the progression and shows the predicted next chord so you're never late. FREQUENCY FILTERS Playing along to a full band? Filter what you hear: - Bass strings (5-6): Follow the rhythm - Mid strings (3-4): Follow the chords - Treble strings (1-2): Follow the melody NO SUBSCRIPTION Try every feature free for 7 days. Then one single purchase unlocks everything forever. No monthly fee. No yearly renewal. PRIVACY Your music stays yours. 100% on-device processing. No audio is ever recorded or sent anywhere. No account needed. No tracking, no ads.

Screenshots

Altar D3 screens
ToneLens4 screens

Verdict

The call

The clearest difference is in-app purchases: Altar D at none against ToneLens's 1. Altar D also leads on iOS requirement (11.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. ToneLens sells 1 one-off in-app purchase. Altar D asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

Scorecard2 real differences ยท 4 level
Altar D versus ToneLens: the parameters behind the verdict, then further details
ParameterAltar DToneLens
PriceFreeFree
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS11.0 โ€” better17.0
Further details โ€” not scored
Size110 MB10 MB
Age rating4+4+
DeveloperVAUKLABVisto Engineering Sa

In-app purchases

None

Altar D

No in-app purchases

1 purchases

ToneLens

One-time1
  • ToneLens Unlocked$8.99

Questions

Is Altar D free?
Altar D is free to download, with no in-app purchases.
Is ToneLens free?
ToneLens is free to download, with in-app purchases available.
Do Altar D or ToneLens have ads?
Neither Altar D nor ToneLens shows ads.
Which is updated more often, Altar D or ToneLens?
Altar D ships an update weekly, and ToneLens weekly. Most recently, Altar D was updated on October 25, 2026 and ToneLens on October 12, 2026.

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