Introducing ZeroStudio: podcast recording and precise audio editing for iPhone, iPad and Mac

Hello AppleVis,

I'm Meriç Karaca, the developer behind ZeroVisionLabs, and I'd like to introduce ZeroStudio: a podcast recording and audio editing studio designed with blind and low-vision creators in mind.

The idea is straightforward: you should be able to concentrate on your story, your voice and the sound you want to create. ZeroStudio brings recording, multitrack editing, effects, a reusable sound library and flexible export into one workspace, with numerical controls and VoiceOver actions alongside the visual timeline.

View ZeroStudio on the App Store

To make the pricing clear from the start: the studio requires an annual subscription. Eligible users can try it free for 7 days, followed by US$99 per year in the US App Store. Regional prices and trial eligibility are shown before purchase.

Editing by ear, with precise controls

The timeline offers both a clip list and a waveform view. VoiceOver labels, state information, clip navigation and named actions let you select, move, split, duplicate and edit clips through controls that do not depend on dragging a waveform.

Enter start times and edit boundaries numerically, down to three decimal places. Choose a movement step of 1 millisecond, 10 milliseconds, 100 milliseconds or one second. Adjust volume in 1% steps with VoiceOver's adjustable-control gestures. Clip gain can range from 0% to 400%, and track gain from 0% to 200%, so quiet material can be brought forward as well as turned down.

Listen to a preview as you shape a clip, use mute and solo to focus on individual tracks, and move around your episode with playback controls, chapter markers, looping and listening-speed controls. On Mac, keyboard shortcuts cover actions such as creating a project, saving, undoing, redoing, playing, recording, splitting, duplicating and adding markers.

From the first recording to a finished episode

Record directly into your project, pause and resume a take, or bring in existing material. Microphone selection and output controls help you work with the devices available to your system. iPhone and iPad use Apple's audio-routing controls; the native Mac app includes input and playback-output selection. Available routes depend on your connected hardware and the operating system.

Organize an episode into tracks, trim unwanted material, split a recording into clips, rearrange sections and duplicate clips or entire tracks. Clip locking protects an edit from accidental movement, splitting or deletion. Fades and adjustable crossfades help join sections smoothly, while undo and redo give you room to experiment. Original media is preserved during trimming and splitting.

Automatic saving, retained project versions, recovery tools for interrupted recordings and restoration of recently deleted projects help protect your work. Projects can synchronize through a selected iCloud Drive folder, using Apple's own file handling.

A sound collection that is ready when you are

ZeroStudio includes 100 bundled CC0 sound effects and musical jingles from Kenney. These cover impacts, footsteps and other action sounds, science-fiction effects, interface sounds and musical transitions. They are available offline and can be used in commercial productions under their CC0 license. Source and license information is included with the sounds.

Search and preview sounds, mark favorites and insert a sound into the track and position you choose. An intro, a transition or a small sound cue can become part of your episode without leaving the studio.

15 filters, exactly where you want them

The included filters are helium, deep voice, robot, metallic robot, telephone, radio, megaphone, warm voice, bright voice, bass boost, room reverb, echo, chorus, tremolo and noise gate.

Apply a filter to an entire clip or limit it to a specific time range. Adjust its intensity, combine filters, switch individual filters off and audition the result. Studio tools also let you apply filters to a chosen track or across tracks within a project-time selection.

For example, keep the narration natural, give one short line a telephone character, and add echo to the closing phrase. The effect can stay confined to that moment instead of changing the whole recording.

More control over the mix

Beyond the basic edits, the studio includes:

• Volume automation and stereo-pan automation, with points you can adjust over time.
• Music ducking based on the time ranges of speech clips, useful for lowering a music bed under narration. This follows clip placement rather than detecting spoken words automatically.
• Mono, stereo, left-only, right-only and swapped-channel processing, plus a separate mono/stereo choice for the exported file.
• Reverse audio and permanent speed changes that change duration and pitch together, while retaining the original source.
• Polarity inversion and DC-offset removal.
• Test-tone generation at a chosen frequency and silence generation for an exact duration.
• Alignment to a timing grid, the nearest chapter marker or the playhead.
• Peak and RMS analysis, including a count of clipped samples, plus sample-peak normalization when exporting.
• Separate-track exports, often called stems, and exports of a selected project-time range.
• A CSV production timeline containing chapter and clip timings.

These tools give you choices for detailed editing without requiring you to use every advanced control for a simple recording. Peak normalization is sample-peak based; it is not LUFS loudness mastering.

Build a library that belongs to your workflow

Keep your own intros, outros, jingles, voice clips and frequently used sounds in a personal library independent of any one project. Import, rename, tag, search, favorite and preview items. Convert formats or make an edited copy with trimming and filters. Library items can be shared, deleted and restored.

You can also take a precise range from a clip and send it to another project's chosen track and time, save it to your library, or export it as a separate audio file. That makes it practical to reuse a recurring introduction or turn part of an episode into a standalone excerpt.

Bring material in; take your work out

Import supported audio files or extract audio from a video. ZeroStudio can also appear in the share sheet of Photos, Files and other compatible apps. Choose an existing project, a new project or your personal library. Shared media is queued, and ZeroStudio completes the import when you open the main app.

Export formats include MP3, Ogg Opus, WAV, M4A/AAC, AIFF, CAF and ALAC. Choose the sample rate, mono or stereo, and the bitrate or bit depth supported by the selected format. Export preferences can be saved for future projects. Opus uses a 48 kHz time base. Protected media is not supported.

A workspace for your device and your preferences

ZeroStudio supports iPhone in portrait, iPad in portrait or landscape, and a native Mac interface with menus and keyboard commands. Minimum requirements are iOS/iPadOS 17 and macOS 14.

Choose system, light or dark appearance, higher contrast and larger text. You can change the interface language in Settings. The nine supported languages are English, Turkish, German, Arabic, Albanian, French, Italian, Dutch and Simplified Chinese; Arabic includes right-to-left interface layout.

Audio processing happens on your device. There are no advertisements or third-party analytics, and no separate ZeroStudio account is required.

Trying ZeroStudio and sharing feedback

The 7-day introductory trial is available to eligible users. After the trial, the annual subscription renews automatically at the price shown in your App Store region unless cancelled. You can manage it through Apple's subscription settings, and Restore Purchases is available in the app. To avoid the next charge, cancel at least 24 hours before the trial or current subscription period ends. If access expires, your projects are not automatically deleted.

If you try ZeroStudio, I would especially welcome feedback on navigating clips with VoiceOver, making precise edits, using the Mac keyboard workflow and moving between recording, effects and export. Please share your device and operating-system version, the steps you took and what you expected to happen. That detail will help identify places where the experience can be improved.

What would you like to create with it: a podcast, an audio story, a tutorial or something else?

Explore ZeroStudio on the App Store

Thank you for taking a look and sharing your experience.

Meriç Karaca ZeroVisionLabs