Comparison

HeadStack vs AD

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

Head to head
About

HeadStack

This app offers a virtual tape loop with 8 independently configurable playback heads for creating diverse echo effects. It captures the warmth of classic tape machines while offering modern flexibility for sound design, from vintage echoes to evolving ambient textures.

Highlights
  • Multi-head tape engine with 8 playback heads
  • Vintage tape character and imperfections
  • Independent control for each playback head
  • Rotating head wheel for dynamic effects
  • Granular harmony engine for pitch-shifted textures
  • Per-head modulation and creative feedback routing
  • Diffusion and smearing for atmospheric washes
Features
Read full description

HeadStack is a multi-head tape delay inspired by the character, movement and musicality of classic magnetic echo machines, reimagined for modern production. At its heart is a virtual tape loop with 8 independently configurable playback heads. Each head can be positioned, levelled and panned to create everything from vintage slap-back echoes and rhythmic repeats to vast stereo soundscapes and evolving ambient textures. While HeadStack captures the warmth and unpredictability of classic tape systems, it is not limited by their mechanical constraints. Individual heads can be modulated, filtered, diffused, pitch-shifted and transformed into granular playback engines, opening up a palette that ranges from authentic analogue echoes to shimmering harmonies and cinematic atmospheres. The tape itself becomes an instrument. Rotate the head wheel to continuously reposition playback points, stretch the spacing between heads, introduce head loss, or create cascading feedback networks that evolve with every repeat. Independent filtering, stereo placement and modulation allow each head to develop its own character within the delay line. You can even play sequences Into HeadStack and freeze it using your hold pedal and continue to play over the top. Whether you’re searching for vintage tape ambience, rhythmic multi-tap delays, lush granular harmonies or experimental feedback textures, HeadStack combines the soul of a classic tape echo with the flexibility of a modern creative effects processor. Welcome to a new generation of tape delay. HeadStack Features: Multi-Head Tape Engine - Create complex rhythmic delays using multiple independently controllable playback heads running on a shared virtual tape loop. Vintage Character - Capture the warmth, movement and musical imperfections of classic tape echo machines with adjustable tape loss, filtering and feedback behavior. Independent Head Control - Each playback head features its own level, pan, timing offset and tonal shaping, allowing intricate delay patterns and evolving stereo textures. Rotating Head Wheel- Continuously reposition or stretch the virtual head arrangement to create shifting rhythms, moving echoes and dynamic performance effects. Granular Harmony Engine - Transform individual heads into pitch-shifted granular voices, generating harmonies, octave layers and shimmering textures directly from the tape loop. Per-Head Modulation - Add movement and expression with independent modulation of playback position, spacing, tremolo and stereo placement. Creative Feedback Routing - Choose between traditional multi-head feedback or route feedback from a specific playback head for unique echo patterns and evolving repeats. Diffusion & Smearing - Blend between precise rhythmic echoes and spacious, atmospheric washes using integrated diffusion processing. Deep Stereo Imaging - Create anything from focused mono echoes to wide immersive soundscapes with per-head panning, Haas delay and stereo enhancement controls. Performance Ready - Designed for real-time interaction, encouraging hands-on manipulation of head positions, modulation and feedback while performing. Precision & Experimentation - Dial in authentic tape echoes, lush ambient delays or push the engine into unpredictable granular and feedback-driven territories. Modern Workflow - Combines the immediacy of classic hardware with the flexibility, recall and precision expected from a contemporary audio plugin. Interactive Head Wheel - Grab and rotate the virtual head wheel to reposition playback heads, create evolving delay patterns and perform dramatic tape-style scrubbing effects. Dynamic Tape Warping- Enable Rotate and Stretch modes to continuously morph the spacing and timing between playback heads, transforming static echoes into living, breathing rhythmic textures. Freeze Buffer - Freeze the contents of the audio buffer using a foot pedal, capture ideas and play over the top.

About

AD

This app emulates a classic 1983 micro synthesizer with modern enhancements like MPE and eight-voice polyphony. It offers a rich sound engine with multiple oscillators, filters, and a comprehensive drive section for unique sonic textures. Enjoy extensive modulation options and a built-in keyboard for immediate creativity.

Highlights
  • Eight-voice polyphony
  • MPE support
  • Classic four-pole lowpass filter
  • Comprehensive drive section
  • AUv3 and standalone operation
  • Preset manager with favorites
  • Built-in chicklet keyboard
Features
Read full description

We rebuilt the legendary micro composer of 1983, then gave it everything the original owners wished for: eight voices, MPE, and a couple of new dirty tricks. The voice is the one you know: a single fat oscillator with sawtooth and pulse (manual, LFO, or envelope PWM), a three-mode sub oscillator, and a noise source, mixed and driven into a classic four-pole lowpass filter. One snappy ADSR, switchable env/gate VCA, and an LFO with triangle, square, stepped random, and noise shapes, complete with onset delay, tempo sync, and retrigger. Portamento with the proper on/auto/off modes, and gate, gate+trig, and LFO trigger modes, exactly like the hardware. Then we went further: • Eight-voice polyphony, or the original mono behavior with the flip of a switch • MPE support with per-note pitch bend and pressure, four aftertouch destinations (VCO mod, VCF mod, filter freq, LFO rate), and adjustable pressure smoothing • MTS-ESP microtonal tuning, retuned continuously while notes sound • SPREAD for stereo voice panning, and AGE, which drifts each voice like forty-year-old components • A full drive section: pre-filter saturation, filter drive, post-VCA distortion, and a tilt EQ • Velocity to filter and amp • A chicklet keyboard with latch and octave shift, playable right on the panel • Full preset manager with favorites and a factory bank • Five faceplate colors, including one for console cowboys • AUv3 and standalone, with an interface that fills whatever window your host hands it AD-202 works everywhere iOS makes noise: AUM, apeMatrix, Logic Pro, GarageBand, Cubasis, and any other AUv3 host, plus a standalone app with its own audio and MIDI settings. No subscriptions. No accounts. No nonsense. Buy it once, own it forever.

Screenshots

HeadStack4 screens
AD4 screens

Verdict

The call

HeadStack and AD both sit at 4.8 stars, but that hides the real split: 100% of HeadStack's written reviews are positive against 83% of AD's. AD's advantage is price ($6.99 vs $7.99) and iOS requirement (12.0 vs 14). On rating, ratings volume, update cadence and ads 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

HeadStack costs $7.99 and AD $6.99 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 — 4.8 for HeadStack against 4.7 for AD. Both are backed by a comparable volume of ratings — 5 and 12 respectively. Written reviews are what separate them: 100% of HeadStack's written reviews are positive against 83% of AD's.

UpkeepUpdate frequency

HeadStack ships an update every 9 days, AD every 2 weeks. The most recent releases landed on October 1, 2026 and September 15, 2026 respectively.

Scorecard3 real differences · 7 level
HeadStack versus AD: the parameters behind the verdict, then further details
ParameterHeadStackAD
Price$7.99$6.99 — better
Rating4.8 (5 ratings) — better4.7 (12 ratings)
Positive reviews100.0% of reviews — better83.3% of reviews
Number of ratings512 — better
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1412.0 — better
Further details — not scored
Size25 MB73 MB
Age rating4+4+
Developer4Pockets.comAudio Damage, Inc.

Customer experience

HeadStack

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

AD

All ratings12 ratings
Positive91.7%
Neutral0.0%
Negative8.3%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

None

HeadStack

No in-app purchases

None

AD

No in-app purchases

Questions

Is HeadStack free?
HeadStack costs $7.99, with no in-app purchases.
Is AD free?
AD costs $6.99, with no in-app purchases.
Which has better reviews, HeadStack or AD?
HeadStack is rated higher. HeadStack averages 4.8 out of 5 from 5 ratings, while AD averages 4.7 from 12 ratings.
Do HeadStack or AD have ads?
Neither HeadStack nor AD shows ads.
Which is updated more often, HeadStack or AD?
HeadStack ships an update every 9 days, and AD every 2 weeks. Most recently, HeadStack was updated on October 1, 2026 and AD on September 15, 2026.

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