Comparison

Model D6 vs Groove Number

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

Head to head
About

Model D6

This app is a physical modeling emulation of the classic Hohner Clavinet D6 keyboard. It recreates the iconic funky sounds used in 70s music and offers extensive sound shaping capabilities with built-in effects and amp simulations.

Highlights
  • Physical Modeling engine
  • Authentic D6 filter recreation
  • Adjustable pickup positions
  • Built-in Wah-Wah, Phaser, Delay, and Reverb effects
  • Amplifier simulator with 5 models
  • Responds to pitch bender and aftertouch
Features
Read full description

GSi Model D6 is a physical modeling emulation of a Hohner Clavinet D6. INSTRUMENT BACKGROUND It was back in the fifties when German inventor Ernst Zacharias invented one of the funkiest keyboards of all times. At first the intention was to make a portable version of a harpsichord, but it soon turned into one of the most used keyboards in rock and pop music. You will certainly recognize it in the famous pop song "Superstition", and in many other funky tunes of the seventies. Many police and investigation story movies and TV shows of the 70's and the early 80's had music themes based on funky accompaniments made with the D6, a slap bass and drums. This instrument can reproduce the sound of an electric guitar and can be treated with the same effects used by guitarists (wah-wah, distortion, phaser, chorus, etc.) for both rhythmic and melodic textures, since it is actually based on a set of 60 strings and two humbucker pickups very similar to those used in electric guitars. The sound engine of GSi Model D6 comes from the exact same code that powers the GSi Gemini and the Crumar Seven as well as the Crumar Mojo 61. Some more parameters have been added to the model in order to make the instrument sound even more versatile and adjustable to personal taste. Main features: - Physical Modeling engine (no samples) - Full Polyphony (60 strings) - Authentic string sympathetic resonances - Authentic recreation of the 4 D6 filters - Two Pickups with adjustable positions - Authentic damper lever - String quality setting - Hammer Tip quality setting - Wool damper quality setting (Release length) - Responds to pitch bender (Whammy bar mod) - Responds to aftertouch (string tapping overpressure) - Built-in Wah-Wah effect modeled after the famous JH-1 pedal - Wah-Wah can be modulated by LFO, Dynamics or via Midi CC message - Built-in Phaser effect modeled after the famous Phase 90 pedal - Built-in Amplifier simulator with 5 models (Twin, JCM, AC, RJC and Bass) - Amp Distortion and pickup feedback - Built-in Stereo Delay effect - Built-in Stereo Reverb effect - Built-in programmer with unlimited Programs - Embedded user's' manual - Available as Stand-alone application and audio plugin - Very low CPU and RAM usage

About

Groove Number

Analyze the rhythmic feel of your music with detailed swing percentage, BPM, and key analysis. Visualize your groove through various graphical displays and export it as MIDI for use in your DAW. All analysis is performed on-device for privacy.

Highlights
  • Swing % analysis
  • BPM estimation
  • Key detection
  • Multiple visualization modes
  • Audio file analysis
  • Live microphone analysis
  • Groove to MIDI export
  • Siri integration
Features
Read full description

how swung is your track? groove number gives you the number. drop in a song, record a clip, or open the live mic — groove number listens and tells you the one thing drum machines flatten and great players bend: the groove. 50% is dead straight. ~66% is full triplet swing. most music that feels good lives in between, around 54–62%. now you can see it. and it's not just the number. what it reads • swing % — the hero. one honest number for how far off the straight grid the groove sits. • bpm — dual-estimator with an octave guard, so 174 never gets called 87. nudge it ×2 / ÷2 or tap the tempo to lock it, and the swing recomputes against the corrected grid. • key — chroma + krumhansl-schmuckler with a tuning estimate, shown with a confidence read and the runner-up key, so a close call never hides. four ways to see it • meter — the number, front and center: swing %, bpm, and key in one calm readout. • swing grid — the signature view. every onset plotted against the straight 8th/16th grid, colored on-time, late, or rushing. you can see the pocket. • spectrogram — mel-scaled heatmap, quiet to loud, low to high, with a frequency + dB scale. • chromagram — the 12 pitch classes over time, tonic marked. how it listens • a file you drop in or pick (mp3, m4a, aac, wav, aiff, flac) • a clip you record — it listens and stops on its own the moment the groove locks • the live mic — a running bpm + swing read in the room, with a VU level meter and a live spectrogram one more thing • groove → midi — export the groove as a midi clip, swing baked into the note timing. drop it on a drum track in any daw and it plays your pocket. hands-free • siri: "what's the groove number of this song" records a clip and stops on its own. "start listening in groove number" opens live. "what was the last groove number" reads you the last result. • shortcuts: analyze audio file returns swing, bpm and key for any file, so you can tag a folder of samples by bpm. open in groove number sends a file straight in. built to be calm and honest • fully on-device. your audio is analyzed right on your iphone, ipad, or mac. nothing is uploaded. nothing is stored on a server. • no account. no sign-up. no ads. no tracking. • strongest on four-on-the-floor and electronic music. live, acoustic, and rubato material is harder — so groove number always shows its confidence and hands you the ×2/÷2 and tap-tempo overrides. wrong calls stay visible, never silent. one number for the feel of a track. plus everything you need to trust it.

Screenshots

Model D62 screens
Groove Number4 screens

Verdict

The call

The clearest difference is price: Groove Number at $1.99 against Model D6's $19.99. Groove Number also leads on update cadence (every 3 days vs every 9 months). Model D6's advantage is ratings volume (5 vs 1) and iOS requirement (11.0 vs 17.0). On rating, ads, in-app purchases and monetization model there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Model D6 costs $19.99 and Groove Number $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Model D6 against 5.0 for Groove Number. That said, the two scores are not equally well evidenced: Model D6 has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Model D6 ships an update every 9 months, Groove Number every 3 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 6 level
Model D6 versus Groove Number: the parameters behind the verdict, then further details
ParameterModel D6Groove Number
Price$19.99$1.99 — better
Rating5.0 (5 ratings)5.0 (1 ratings)
Positive reviews66.7% of reviews—
Number of ratings5 — better1
Update frequencyEvery 9 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better17.0
Further details — not scored
Size13 MB3 MB
Age rating4+4+
DeveloperGenuine SoundwareJoshua Langberg

Customer experience

Model D6

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Groove Number

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Model D6

No in-app purchases

None

Groove Number

No in-app purchases

Questions

Is Model D6 free?
Model D6 costs $19.99, with no in-app purchases.
Is Groove Number free?
Groove Number costs $1.99, with no in-app purchases.
Which has better reviews, Model D6 or Groove Number?
Model D6 and Groove Number are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.
Do Model D6 or Groove Number have ads?
Neither Model D6 nor Groove Number shows ads.
Which is updated more often, Model D6 or Groove Number?
Model D6 ships an update every 9 months, and Groove Number every 3 days. Most recently, Model D6 was updated on November 3, 2026 and Groove Number on November 5, 2026.

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