Comparison

SL Tune vs ABDCTN

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

Head to head
About

SL Tune

This app offers vocal pitch and tone effects for iPad, providing quick corrective or creative processing. It features fast pitch correction, modern vocal tone shaping, and mix control for flexible audio manipulation. It supports AUv3 for integration with compatible music hosts.

Highlights
  • Fast pitch correction
  • Modern vocal tone shaping
  • Mix control
  • Factory and user presets
  • AUv3 support
Features
Read full description

SL Tune is a focused AUv3 vocal pitch and tone effect for quick corrective or creative processing on iPad. • Fast pitch correction controls • Modern vocal tone shaping • Mix control for flexible processing • Factory presets and local user presets • AUv3 support for compatible iPad music hosts Works as a standalone preview app and as an AUv3 effect in GarageBand, AUM, Cubasis, BeatMaker 3 and other compatible hosts.

About

ABDCTN

This app generates classic sci-fi synthesizer sounds live from oscillators, filters, and envelopes. Interact with a visual farm interface where elements control sound parameters. Create unique sounds by bending, stretching, and rebuilding them.

Highlights
  • Live sound generation
  • Visual instrument interface
  • Interactive sound manipulation
  • Customizable oscillators and filters
  • Automated sound sequencing
  • AUv3 instrument support
Features
Read full description

Every science-fiction film had a sound department, and somewhere in it stood a synthesizer. ABDCTN is that synthesizer, rebuilt for your phone and your iPad: not a collection of recordings of those sounds, but the machine that makes them. Theremins, saucers, tractor beams, alarms, talking computers, and everything in between, generated live from oscillators, filters and envelopes. Each sound is a starting point, yours to bend, stretch and rebuild until it is one nobody has heard before. THE PICTURE IS THE INSTRUMENT There are no knobs, no sliders, no menus. The whole screen is a farm at night, and everything on it is a control. The fence is the keyboard: planks are white keys, flower pots are black keys. The alien on the left is the envelope: pull its body for attack, stretch its neck for decay, lift and reach its hands for sustain and release. The alien on the right is the filter. Lift the cow's tail to detune, lift the whole cow into the beam and the reverb grows. Slide the barn door for volume. Raise the chimney for drive. Tap the hayloft window to crush the bits. The clouds are the LFO: how much, how fast, what shape. Drag the saucer higher and the echo follows. Tap a light on the saucer to choose a sound, tap the moon to change the bank. THE RAY GUN A ray gun hangs next to the moon, and it makes the farm play itself. Tap the gun to choose the ray's speed. Light blue sweeps every second, cyan every three seconds and pink every ten. Tap once more for static, which erases. Hold the gun and it comes off its hook. Point its tip at anything on the farm, and whatever lights up yellow can be hit: an alien's legs, neck or either hand, the cow or her tail, the saucer's dome, the barn door, the chimney, the hayloft window or a cloud. Let go and that part turns the ray's colour. It then sweeps from one end of its range to the other on its own, in time with the sound. The filter opens and closes, the cow floats up into the reverb and sinks back, the window flickers the crusher on and off, and the third cloud steps through the LFO shapes. Shoot as many parts as you like, each at its own speed. Touch a swept part and it holds still under your finger. Shoot a part with static to stop its ray, or double-tap the gun to clear every ray on the sound. Rays are saved with each sound and in your presets. In a host, every ray is an automatable parameter. Every edit is remembered per sound. Hold a light to take a sound back to the factory. A REAL SYNTHESIZER Two oscillators with band-limited saw and pulse, an endless Shepard stack for lifts that never stop rising, noise and ring modulation. A state-variable filter that sweeps from low-pass through band-pass to high-pass, with envelope, key tracking and LFO. Real stereo: the oscillators spread across the field, voices sit where their keys are, a ping-pong tape echo bounces between the speakers, a spring-like reverb on each side. IN THE STUDIO Works as an AUv3 instrument in AUM, Drambo, Logic Pro, GarageBand and other hosts, with the same picture inside the host and every control exposed as an automatable parameter. MIDI 2.0 with full MPE: per-note pitch bend, pressure and timbre, so expressive controllers play it the way they were meant to. A hold latch keeps chords sounding with no fingers on the screen, and the instrument keeps playing in the background from a MIDI keyboard. Save and load your own presets from the transmission log. Pay once, own it. No subscription, no ads, no account, no tracking, nothing leaves your device. Somewhere a cow is rising slowly into the light. She sounds wonderful.

Screenshots

SL Tune3 screens
ABDCTN1 screens

Verdict

The call

The clearest difference is update cadence: ABDCTN at daily against SL Tune's weekly. ABDCTN also leads on price ($3.99 vs $7.99). SL Tune's advantage is iOS requirement (15.0 vs 18.0). On rating, ratings volume, ads and in-app purchases 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

SL Tune costs $7.99 and ABDCTN $3.99 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 SL Tune against 5.0 for ABDCTN. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

SL Tune ships an update weekly, ABDCTN daily. The most recent releases landed on October 15, 2026 and October 19, 2026 respectively.

Scorecard3 real differences · 7 level
SL Tune versus ABDCTN: the parameters behind the verdict, then further details
ParameterSL TuneABDCTN
Price$7.99$3.99 — better
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews—
Number of ratings12 — better
Update frequencyWeeklyDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size17 MB2 MB
Age rating4+9+
DeveloperVIACHESLAV ZHILTSOVLASZLO DOBROVOLSZKI

Customer experience

SL Tune

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ABDCTN

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SL Tune

No in-app purchases

None

ABDCTN

No in-app purchases

Questions

Is SL Tune free?
SL Tune costs $7.99, with no in-app purchases.
Is ABDCTN free?
ABDCTN costs $3.99, with no in-app purchases.
Which has better reviews, SL Tune or ABDCTN?
SL Tune and ABDCTN are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do SL Tune or ABDCTN have ads?
Neither SL Tune nor ABDCTN shows ads.
Which is updated more often, SL Tune or ABDCTN?
SL Tune ships an update weekly, and ABDCTN daily. Most recently, SL Tune was updated on October 15, 2026 and ABDCTN on October 19, 2026.

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