Frequently Asked Questions

Volume Booster is an iOS audio enhancement app that lets you amplify your device's sound beyond standard limits. It includes Volume Boost, Bass Boost, a 6-Band Equalizer with 8 presets, Playback Speed Control, Audio Export, Waveform Visualization, and Music Library integration.

Volume Booster is free to download with basic features. A premium subscription unlocks all features including Volume Boost, Bass Boost, Equalizer, Speed Control, and Audio Export. A 3-day free trial is available for new users.

Volume Booster is available for iPhone running iOS 16 or later.

Volume Boost amplifies your audio output beyond the standard device volume limits using advanced audio processing. Simply import your audio and adjust the volume slider to boost your sound instantly.

Extended listening at elevated volume levels may cause hearing damage. We strongly recommend starting at lower volume levels and gradually increasing as needed. Follow safe listening guidelines and take regular breaks. Appcellent is not responsible for any hearing damage resulting from the use of this app.

Volume Booster works with your Apple Music library and supports importing local audio files from your device storage. A demo audio track is also included for testing.

Yes. You can adjust the playback speed from 0.5x to 2.0x, making it perfect for music, podcasts, and audiobooks.

The 6-Band Equalizer covers the following frequencies: 60Hz, 150Hz, 400Hz, 1kHz, 2.4kHz, and 15kHz. Each band can be adjusted within a range of ±12 dB.

Volume Booster includes 8 built-in equalizer presets: Flat, Rock, Pop, Jazz, Hip Hop, Electronic, Classical, and Vocal Boost. You can also create and save your own custom presets.

Bass Boost enhances the low-frequency range of your audio, adding depth and power to the sound. You can adjust the bass level from 0 to ±12 dB for precise control over your listening experience.

Yes. You can export your audio with all applied effects — including Volume Boost, Bass Boost, and Equalizer settings — directly to your device for sharing or later use.

Volume Booster supports common audio formats from your Apple Music library and local audio files. Exported audio is saved in standard formats compatible with most devices and apps.

The premium subscription unlocks:

• Volume Boost (unlimited audio amplification)
• Bass Boost (precision low-frequency control)
• 6-Band Equalizer with 8 presets and custom profiles
• Playback Speed Control (0.5x to 2.0x)
• Audio Export with applied effects
• Waveform Visualization

Subscription options and pricing are displayed within the app at the time of purchase. Pricing may vary by region.

Yes. We offer a 3-day free trial for new users. At the end of the trial, your subscription will automatically convert to a paid subscription unless you cancel before the trial ends. Any unused portion of the free trial is forfeited upon purchasing a subscription.

You can cancel your subscription at any time through your Apple ID Account Settings:

1. Open the Settings app on your iPhone.
2. Tap your name at the top.
3. Tap Subscriptions.
4. Find Volume Booster and tap it.
5. Tap Cancel Subscription.

Cancellation takes effect at the end of your current billing period. You will continue to have access to premium features until then.

If you previously purchased a subscription and need to restore it (for example, on a new device), go to the app's Settings and tap "Restore Purchases." Your subscription will be restored automatically if it is still active.

Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current billing period. Your account will be charged for renewal within 24 hours prior to the end of the current period.

All purchases are processed by Apple through the App Store. To request a refund, visit reportaproblem.apple.com or contact Apple Support directly.

We collect device identifiers, usage analytics (via Mixpanel), and subscription data (via RevenueCat). Music library access is handled on-device — your audio files are never uploaded to our servers. For full details, see our Privacy Policy.

Volume Booster accesses your Apple Music library with your permission for playback purposes only. All audio processing happens on your device. Your original music files are never modified or uploaded.

Yes. You can request deletion of your personal data at any time by contacting us at support@appcellent.co. We will process your request in accordance with applicable data protection laws.