# Kicker U

> Mobile audio installation knowledge, enclosure design, and subwoofer wiring tools. (iPhone/iPad app by Kicker.)

- Source: https://appshunter.io/ios/app/kicker-u/id418548755 (this page in markdown: same URL + `.md`)
- Developer: [Kicker](https://appshunter.io/developer/1632645523)
- Category: Reference, Lifestyle
- Price: $3.99
- Rating: 2.30/5 from 49 App Store ratings · 73 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 87 MB
- Languages: American English
- Released: 2011-02-14
- Data updated: 2026-09-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/kicker-u/id418548755/reviews.md

## What is Kicker U?

Subwoofer school’s in session! You’ve now enrolled into KICKER U, where you have instant access to a toolbox of mobile-audio installation knowledge. Let KICKER U help you design and build custom enclosures and assist with wiring subwoofers. 

This version contains calculators for converting your port from round to slot or vice versa, calculate the tuning frequency of your existing enclosure as well as the ability to enter and save Thiele-Small parameters to create boxes for any driver you own along with many other features.

## Key features

- Mobile audio installation knowledge
- Custom enclosure design
- Subwoofer wiring assistance
- Port conversion calculator
- Tuning frequency calculator
- Thiele-Small parameter saving

## Chart rankings

- #48 in Top Paid · Reference (US App Store)

## What do users think of Kicker U?

Overall sentiment: negative

**Pros**

- 👍 Useful for box building
- 👍 Handy for tuning amps
- 👍 Good for Kicker product specs
- 👍 Time saver for installers
- 👍 Provides cut lists
- 👍 Professional installer tool

**Cons**

- 🐛 Frequent crashes
- 🐛 No back button
- 🐛 Poor color contrast
- 🐛 Missing newer sub models
- 🐛 Inconsistent calculations
- 🐛 Tone generator issues
- 🐛 Paid app, not free alternatives
- 🐛 Difficult to read text
- 🐛 Outdated app

**Commonly reported bugs**

- App crashes on opening driver manages and box building
- App crashes on iOS 18.6
- App consistently freezes
- Sine sweep quit working
- App shuts down when selecting box builder
- App kicks user out when trying to manage drives
- App force closes when trying to save a box
- App force closes when entering specs
- App keeps closing out when opened
- App crashes when loading saved enclosures
- Tone generator crashes the app
- Saved box builds crash the app
- Custom subwoofer specs not working
- App doesn't show ports in box template
- White text on light grey screen is unreadable
- Colors make numbers unreadable
- Airspace calculator hard to understand
- Frequency generator issues
- Saved boxes crash the app
- Tone generator not working
- App crashes when trying to use tone generator
- App shuts down when trying to save an enclosure
- App doesn't work with custom speakers
- App doesn't calculate real boxes
- App doesn't give order for measurements in custom box builder
- App doesn't show cut list for ports
- App doesn't allow customization of box dimensions
- App doesn't show what to put in each box field
- App doesn't have BL or MMS for Kicker products
- App not compatible with iPhone OS
- App doesn't work with iPhone 5
- App doesn't work with iPhone 6/6+

**Most requested features**

- Add back button
- Include newer sub models (L7T, L7S, Solo X)
- Improve color contrast/readability
- Add port and vent visualization in box builder
- Generate more box templates
- Allow adjustment of specs for recommendations
- Add downfiring enclosure option
- Add amp specs
- Support for more than 2 woofers
- Support for different material thicknesses (5/8, 1/2)
- Allow customization of box dimensions
- Add a mini forum for help

## Recent user reviews (10 of 73)

All indexed reviews: https://appshunter.io/ios/app/kicker-u/id418548755/reviews.md

### 1/5 — Trash

*2026-04-12*

You would think for an app that you have to pay for you could at least have a back button. This app is trash. Who ever approved this ought to be fired.

### 1/5 — App crashes

*2025-08-05*

App crashes on ios 18.6 while opening driver manages and box building

### 3/5 — To Go Back On Pages You Need to Swipe

*2025-05-07*

It's shows in you in the app. Pretty self explanatory.

### 1/5 — Frustrating App

*2025-01-02*

I was hoping for a useful program to examine different changes in speaker and enclosure variables.  This application consistently freezes and provides frustration and no answers.  Highly disappointing support for a company that clouts it over 50 years old.  That is a lot of time to potentially figure things out, or not!

### 1/5 — No updates in 3 years

*2024-12-16*

I didn’t realize that there haven’t been any updates in 3 years. The app doesn’t have the L7T as an option so it does me no good. What a waste.

### 1/5 — Trash

*2024-11-28*

This app is horrible. Whatever section you pick there is no back button, you need to force close the app and reopen it to pick another section. The tone generator section lists start tone, end tone and seconds so you can build your own sweep tests but you cannot change any setting except the first start tone. I can’t believe I paid $3.99 for this garbage. I bought two 12” solo baric 750w L7s and a custom mega cab ground shaker box and wanted to play with some of the options in this app but kicker obviously hasn’t tested this app out on a new iPhone 16 pro max.

### 3/5 — It’s okay …

*2024-10-27*

My biggest problem with the app is that whenever you look at the box template it don’t show you the port or anything what would improve this app a lot would be to show that and also  generate a few softener boxes and let you adjust the specs to see what works best for you & give you recommendations on what size tuning you need etc … other then that it’s 3 star worthy

### 3/5 — Needs improvement

*2024-08-10*

When will the new Solo x be added to this? Other than that app does what it needs to

### 1/5 — I like kicker not the app

*2024-06-09, version 3.1.11*

Whe i try to go to manage drives the app kicks me out the worst 3 dollars spent

### 1/5 — Pretty bad

*2024-05-19, version 3.1.11*

No back button. Have to force close the app to go back a screen. Not worth the money.

## Frequently asked questions about Kicker U

### What does Kicker U do?

Kicker U provides a mobile toolbox for car audio installation knowledge. It helps users design and build custom subwoofer enclosures and assists with wiring subwoofers. The app includes various calculators and tools for precise audio system construction.

### What are the key features of Kicker U?

Key features include calculators for converting ports between round and slot designs, calculating the tuning frequency of existing enclosures, and the ability to enter and save Thiele-Small parameters. This allows users to create custom boxes for any driver they own.

### Is Kicker U free to use?

Yes, Kicker U is available for free. The application does not have any in-app purchases or advertisements, making all its features accessible without cost.

### Who is Kicker U designed for?

This app is designed for car audio enthusiasts and DIYers who want to design and build their own custom subwoofer enclosures and understand mobile audio installation principles. It's a valuable resource for anyone working on their car's sound system.

## Version history (last 5 releases)

### 3.1.11 — 2021-08-19

- Fixed bug when trying to add new driver.
- Bug fixes & code cleanup.

### 3.1.10 — 2021-03-31

- Fixed Input text colors not visible in dark mode.

### 3.1.9 — 2020-11-19

- Fixed crash when using ported enclosure with multiple drivers.
- Fixed port calculation when using multiple drivers.

### 3.1.8 — 2020-10-31

- Fixed Crash in box builder.

### 3.1.7 — 2019-07-13

- Fixed bug when selecting save files on phones.
- Fixed bug where tone generator would not start the first time.

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## More apps by Kicker

- [Kicker U Lite](https://appshunter.io/ios/app/kicker-u-lite/id423580180)
- [TweEQ](https://appshunter.io/ios/app/tweeq/id1001591656)
- [Connect by Kicker](https://appshunter.io/ios/app/connect-by-kicker/id1178670971)
- [FlexTune](https://appshunter.io/ios/app/flextune/id1417233546)

All apps by Kicker: https://appshunter.io/developer/1632645523

## Related topics

[kicker u](https://appshunter.io/ios/topics/kicker-u) · [kicker u lite](https://appshunter.io/ios/topics/kicker-u-lite) · [kicker](https://appshunter.io/ios/topics/kicker) · [kcker](https://appshunter.io/ios/topics/kcker) · [subwoofer builder](https://appshunter.io/ios/topics/subwoofer-builder) · [kicker speaker](https://appshunter.io/ios/topics/kicker-speaker)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-13.*