# AUFX vs K7D

AUFX and K7D both sit at 4.6 stars, but that hides the real split: 90% of AUFX's written reviews are positive against 80% of K7D's. AUFX also leads on iOS requirement (9.0 vs 17.0). K7D's advantage is price ($3.99 vs $4.99). On rating, ratings volume, update cadence and ads there is nothing between them.

AUFX costs $4.99 and K7D $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.6 for AUFX against 4.6 for K7D. Both are backed by a comparable volume of ratings — 33 and 79 respectively. Written reviews are what separate them: 90% of AUFX's written reviews are positive against 80% of K7D's.

AUFX ships an update every 2 months, K7D every 3 months. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | AUFX | K7D |
| --- | --- | --- |
| Price | $4.99 | **$3.99** |
| Rating | [4.6 (33 ratings)](https://appshunter.io/ios/app/aufxdub/id678982701/reviews) | **[4.6 (79 ratings)](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991/reviews)** |
| Number of ratings | 33 | **79** |
| Positive reviews | **89.7% of reviews** | 79.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 6 MB | 113 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kymatica AB](https://appshunter.io/developer/522046659) | [Imaginando Lda](https://appshunter.io/developer/895445015) |

## What reviewers say

### AUFX

[App page](https://appshunter.io/ios/app/aufxdub/id678982701)

This app offers a versatile stereo delay audio effect with extensive customization options. It can produce a wide range of sounds, from clean digital delays to gritty dub echoes and flangers. The app supports processing external audio and other applications, with features for saving and sharing presets.

**Highlights:** High quality 32-bit DSP engine, Tape simulation (noise and warble), Filters in the delay loop, Stereo delay, detune, and ping-pong, Dual LFO for modulation, Inter-App Audio and Audiobus support, Save, load, and share presets

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great sound quality
- 👍 High-quality plugins
- 👍 Excellent effects
- 👍 Impressive quality
- 👍 Complete immersion

**What reviewers complain about**

- 🐛 Not AUv3 compliant
- 🐛 Unusable in current incarnation
- 🐛 Falling behind without AU3
- 🐛 Lacking AU support
- 🐛 Ironically lacks AU support

**Reported bugs**

- Crashes when loading presets
- Loading presets causes crash
- Will NOT launch in AUM
- Workarounds don't work

**Requested features**

- AUv3 support
- Add creativity, functions, magic
- AUv3 would solve the only problem
- AUv3 compliance
- Add AU3


### K7D

[App page](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991)

This app offers a vintage tape delay effect with analog emulation and modern controls. It recreates classic hardware echo machines for a warm, characterful sound. Use it standalone or as an AUv3 plugin in iOS DAWs.

**Highlights:** Analog modeled dual playhead delay, Modeled microphone input with saturation, Normal and Ping Pong modes, High pass and Low pass feedback filters, Powerful LFO time modulation, BPM syncable delay time, MIDI delay time modulation

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🎶 Incredible sound quality
- 🎨 Creative and musical delay
- 💡 Generous presets and easy to use
- 💰 Top-tier for the price
- 🕰️ Authentic tape delay feel

**What reviewers complain about**

- 💻 Extreme lag and crashes
- 🐛 Audio delay issues and glitches
- ⚠️ High resource usage
- ❌ No background audio standalone
- 📉 Randomiser not working (initially)

**Reported bugs**

- App crashing with many instruments
- Project crashes and data loss
- App not opening after crashes
- App deleting progress
- Randomiser not working

**Requested features**

- Fix background audio standalone
- Fix randomiser feature
- Improve CPU efficiency
- Make iPad and iPhone versions compatible
- Add reverse playback option


## Frequently asked questions

### Is AUFX free?

AUFX costs $4.99, with no in-app purchases.

### Is K7D free?

K7D costs $3.99, with no in-app purchases.

### Which has better reviews, AUFX or K7D?

K7D is rated higher. AUFX averages 4.6 out of 5 from 33 ratings, while K7D averages 4.6 from 79 ratings.

### Do AUFX or K7D have ads?

Neither AUFX nor K7D shows ads.

### Which is updated more often, AUFX or K7D?

AUFX ships an update every 2 months, and K7D every 3 months. Most recently, AUFX was updated on October 21, 2026 and K7D on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*