# MP3Gain - Audio Normalization — Sound Booster & Higher Volume > Normalizes audio file loudness to a consistent, professional level. (iPhone/iPad app by SEASOFT LTD..) - Source: https://appshunter.io/ios/app/mp3gain-audio-normalization/id697885500 (this page in markdown: same URL + `.md`) - Developer: [SEASOFT LTD.](https://appshunter.io/developer/456906339) - Category: Music, Utilities - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 16.6 · 17 MB - Languages: American English - Released: 2013-09-07 - Data updated: 2026-09-21 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/mp3gain-audio-normalization/id697885500/reviews.md ## What is MP3Gain? Make all your audio the same volume. Ever jump from one song to the next and have to scramble for the volume button? Or finish a podcast episode that's twice as loud as the last one? MP3Gain fixes that. It analyzes your audio and normalizes it to a consistent loudness — so everything you listen to, share, or upload sounds even and professional. Simple for everyone. Powerful for creators. MP3Gain measures the true loudness of your files and applies gain to bring them to your target level. Three easy modes cover every use case: • Peak — match tracks to a target peak level (in dB). • RMS — match the average energy of your tracks for consistent perceived volume. • EBU R128 (LUFS) — the international loudness standard used by streaming and broadcast platforms, with true-peak limiting. Built-in presets Get started in one tap with presets tuned for real-world standards — Music (-14 LUFS), Podcast (-16 LUFS), Streaming (-14 LUFS), and a simple Default peak setting. Save your own custom presets for repeat jobs. Batch processing Import a whole album, playlist, or batch of files and normalize them all at once. Adjust one file and apply the same settings to every file in your list. Progress is shown per file, and you can cancel anytime. Listen before you commit Play the original and the processed version in-app to compare before you export. No guessing — hear the difference. Keep your music intact MP3Gain preserves embedded album art and metadata. Lossy formats keep their original bitrate; lossless files are processed without additional lossy compression. Import from anywhere • Select files from the Files app • Pull tracks straight from your Music Library • Open an audio file in MP3Gain from any app Supported formats MP3, FLAC, M4A, WAV, AIFF, and OGG. MP3Gain Pro The free plan processes up to 3 files per day — perfect for quick fixes. Upgrade to MP3Gain Pro for unlimited processing: • Yearly — 7-day free trial, then $49.99/year • Lifetime — pay once at $99.99 and unlock forever Subscriptions renew automatically and can be managed or cancelled anytime in your Apple ID settings. Payment is charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or turn off auto-renewal at any time in your Apple ID account settings. Any unused portion of a free trial is forfeited when you purchase a subscription. Privacy Policy: https://getseasoft.com/legal/privacy-policy Terms of Use: https://getseasoft.com/legal/terms-of-service ## Key features - Volume normalization - Multiple analysis modes (Peak, RMS, EBU R128) - Built-in and custom presets - Batch processing - Listen before export - Preserves metadata and album art - Supports MP3, FLAC, M4A, WAV, AIFF, OGG ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | MP3Gain Premium Monthly Plan | $1.99 | per month | | MP3Gain Pro(Yearly) | $9.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | WMA Gain | $6.99 | one-time | | MP3, M4A Gain | $6.99 | one-time | | Gain all audio format | $9.99 | one-time | | MP3Gain Pro (Lifetime) | $19.99 | one-time | ## Recent user reviews (10 of 17) All indexed reviews: https://appshunter.io/ios/app/mp3gain-audio-normalization/id697885500/reviews.md ### 1/5 — It lowered hundreds of songs!! *2025-05-16* What the heck! It lowered all my music! HELP! ### 2/5 — Hype *2024-12-28* Yet another program that doesn’t do what it promises. All I want to do is reduce the volume on an mp3 file, but not with this APP. ### 2/5 — Poor user interface and no error reporting *2024-07-29* I expected this to be similar to MP3Gain for Windows but the user interface is very sparse. The settings menu option is greyed out so I cannot change anything. Multiple files were not adjusted and showed an "!" instead of a green check, but there is no way to find out what the error was. Some of the files were recently purchased music & some were ripped from CDs. I emailed Seasoft tech support one of the files & they said there is nothing wrong with it. I haven't heard anything from them for several days. MP3Gain for Windows adjusted the same files with no errors. In its present state this app isn't worth buying. ### 3/5 — Works, with bugs *2023-08-13* App could not batch process more than 8-tracks at a time without crashing. Also, bitrate is different in resulting file, so resulting files are about twice the size as the orginals. ### 1/5 — Doesnt work *2022-02-08* continuously crashes "MP3 Gain - Audio Normalization quit unexpectedly.” Trying to adjust gain on 89 files Would like my money back ### 1/5 — Useless *2022-02-05* This app crashes and burns within minutes - don't waste your money!!! ### 1/5 — 볼륨 3번이상 조절하려면 돈 내야 함ㅋㅋㅋ *2021-03-11* 그걸 앱 설명에 써놔야하는거 아닌가? mp3 플레이어가 얼마나 많은데 진짜 양심 없네 ### 5/5 — Hands down BEST CUSTOMER SERVICE EVER! *2020-10-07* Read carefully because I never rate an app. I have about 20K songs ripped from various CDs and downloaded over the years. Each at a different volume rate. MP3 Gain 4 is the simplest tool to normalize the output. It does what it says in the tin, no bells and whistles. It is simple to use, and the results are pretty good. What makes this app stand out from the rest is the customer service. I contacted them with some issues I had with my app (I'm not going to go into detail here) but, not only did they fix the problems, but they did it in lightning speed, and were very fast replying to my emails. These guys have a returning customer for life. Strongly recommended ### 5/5 — Simple and effective *2019-06-18* I record sermons at my church using a remote mic and a Zoom recorder. There are fans making a low humming sound in the background, so we record at a low volume to avoid picking up the hum. This app lets us quickly and easily increase the gain. It's so easy to use and does exactly what we need without having to launch a larger aplication and wade through the menus to get it done. Thank you! ### 3/5 — So many flaws *2017-07-07* I do not recommend purchasing this app. - The app description says the app “losslessly” adjusts audio files to “a" specified target volume. Not true. For some songs, quality loss is not very noticeable. But for some, I heard glitches during adjustments. - Also, based on the description, I thought I would have the option to set a volume and have the app do all the work: make the volumes consistent for multiple songs. Like Sound Check in itunes. Wrong. One must change each individual song volume manually. - It’s also difficult to preview songs. There is no way to fast forward or rewind the songs while previewing. - After you apply volume changes, the original audio files are altered. You have no option to save as separate copies. It’s only 2.99, but I would save this money and buy a better app. ## Frequently asked questions about MP3Gain ### What is MP3Gain used for? MP3Gain is used to normalize the volume of audio files, making them all play at a consistent loudness. This is useful for music playlists, podcast episodes, or any audio content where volume levels vary. ### Does MP3Gain have ads? MP3Gain does not contain advertisements. The app offers a free tier with limitations and an optional Pro upgrade for unlimited processing. ### What audio formats does MP3Gain support? MP3Gain supports a wide range of audio formats including MP3, FLAC, M4A, WAV, AIFF, and OGG. This allows for normalization of most common audio file types. ### How does MP3Gain compare to other audio normalizers? MP3Gain offers multiple normalization modes like Peak, RMS, and the industry-standard EBU R128 (LUFS). It also provides batch processing and the ability to preview changes before exporting, which are key features for efficient audio management. ### What are the pricing options for MP3Gain Pro? MP3Gain Pro offers two upgrade options: a yearly subscription for $49.99/year with a 7-day free trial, or a lifetime purchase for $99.99. These unlock unlimited file processing. ### Can I cancel my MP3Gain Pro subscription? Yes, subscriptions can be managed or cancelled at any time through your Apple ID settings. Auto-renewal can be turned off at least 24 hours before the end of the current billing period. ### Is MP3Gain suitable for professional use? Yes, MP3Gain is powerful enough for creators, offering the EBU R128 (LUFS) standard used by streaming and broadcast platforms. Its precision and batch processing capabilities make it suitable for professional audio workflows. ### What is the age rating for MP3Gain? MP3Gain has an age rating of 4+. This indicates it is suitable for a wide audience, including children, with no mature content. ## Version history (last 1 release) ### 2.0.0 — 2026-09-04 No release notes. ## More apps by SEASOFT LTD. - [RAW Batch - RAW Converter](https://appshunter.io/ios/app/raw-batch-raw-converter/id670504280) - [Easy AI Writer](https://appshunter.io/ios/app/easy-ai-writer/id6475717644) All apps by SEASOFT LTD.: https://appshunter.io/developer/456906339 --- *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 2026-09-21.*