# Custom Sound vs Flat Equalizer

The clearest difference is in-app purchases: Custom Sound at none against Flat Equalizer's 4. Custom Sound also leads on iOS requirement (8.0 vs 17.6). Flat Equalizer's advantage is update cadence (fortnightly vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Flat Equalizer sells 4 in-app purchases, starting at $2.99 per 7 days. Custom Sound asks for nothing beyond the download.

Custom Sound ships an update every 7 months, Flat Equalizer fortnightly. The most recent releases landed on October 4, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Custom Sound | Flat Equalizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/custom-sound/id838175440/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 94.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 11 MB |
| Requires iOS | **8.0** | 17.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [SEIKAKU](https://appshunter.io/developer/860317297) | [Md Milon Hossain](https://appshunter.io/developer/1729011832) |

## What reviewers say

### Custom Sound

[App page](https://appshunter.io/ios/app/custom-sound/id838175440)

This application allows users to control IP Speakers and Wifi Speakers by adjusting various audio parameters. It offers features like frequency and gain adjustment, filter type selection, and the ability to save custom presets for personalized sound experiences.

**Highlights:** Adjust frequency, gain, and q factor, Select filter types, Adjust input gain, Save current presets, Automatic device search

**Features:** macOS Compatibility

**In-app purchases:** none


### Flat Equalizer

[App page](https://appshunter.io/ios/app/flat-equalizer/id6753087386)

Enhance your audio with a professional music equalizer and powerful volume booster. Fine-tune tracks with custom presets or create your own settings. Experience immersive sound with advanced features for wired and wireless headphones.

**Highlights:** 10-band music equalizer, Headphone volume booster, Customizable EQ presets, Extra Boost feature, Bluetooth equalizer support, Save custom EQ settings

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Yearly | $99.00 | per year |
| Lifetime | $9.99 | one-time |
| Lifetime | $29.99 | one-time |

**What reviewers like**

- 🔊 Loud and Crystal Clear
- 💎 Crystal Clear Sound
- 🎨 Perfect Sound Customizer
- 🎯 Love the Presets
- 🌟 Highly Recommended


## Frequently asked questions

### Is Custom Sound free?

Custom Sound is free to download, with no in-app purchases.

### Is Flat Equalizer free?

Flat Equalizer is free to download, with in-app purchases available.

### Do Custom Sound or Flat Equalizer have ads?

Neither Custom Sound nor Flat Equalizer shows ads.

### Which is updated more often, Custom Sound or Flat Equalizer?

Custom Sound ships an update every 7 months, and Flat Equalizer fortnightly. Most recently, Custom Sound was updated on October 4, 2026 and Flat Equalizer on October 17, 2026.

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