Audio Upscaler: HD Voice

Make muffled, tinny, and low-bitrate recordings sound like crisp 48kHz HD — in one tap, right on your iPhone.

Audio Upscaler is true on-device neural bandwidth extension: it regenerates the high frequencies your recording is actually missing, instead of just boosting volume or subtracting noise. It keeps your real voice — it doesn't re-speak it. Nothing is uploaded, no account, works offline.

▸ REGENERATE THE HIGHS — DON'T FAKE THEM
See the proof before you save: a live before/after over a dual spectrogram shows brand-new detail synthesized above the original cutoff line.
• True bandwidth extension — rebuilds 8kHz phone, Zoom, and voicemail audio toward 48kHz HD
• Adds real harmonics on top of your voice — no robotic, re-spoken, or phantom words
• Free before/after A/B preview on every upscale — no watermark, ever

▸ WORKS ON WHATEVER YOU'VE GOT
• Record in the app, or import audio (m4a, wav, mp3, caf)
• Upscale the audio inside a video clip — the video itself stays untouched
• Built for podcasts, interviews, voicemails, lectures, old tapes, and AI-generated music

▸ PRIVATE BY DESIGN
• 100% on-device — your audio never leaves your iPhone
• No account, no sign-up — even works in airplane mode
• Neural upscaling runs on the Apple chip

▸ STUDIO HD — PREMIUM
• A higher-fidelity, universal-rate model for low-bitrate audio and music
• Wet/dry blend to tame any sizzle and dial in a natural mix
• Unlimited upscales, longer clips, video audio, batch processing, zero ads

▸ FREE vs PREMIUM
FREE: 1 upscale per day, up to 60 seconds, Standard HD model, unlimited before/after preview, save & share.
PREMIUM: unlimited upscales, Studio HD model, video audio replacement, wet/dry control, batch processing, no ads.

PREMIUM SUBSCRIPTION

Audio Upscaler Premium is available with the following subscription options:

Premium Monthly: $8.99/month
Premium Annual: $39.99/year — includes a 7-day free trial

Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase.

Terms of Service: https://audioupscaler.bulpara.com/terms
Privacy Policy: https://audioupscaler.bulpara.com/privacy