Stereo Microphone vs Voltbridge™ for PowerVault
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stereo Microphone
Transform your device into a powerful microphone or audio recorder. Enhance your sound with built-in effects like pitch shifting and equalization, and choose from various high-quality recording formats.
- Device as microphone
- Audio recording
- Pitch shifter effect
- 10-band equalizer
- Multiple recording formats
- Noise reduction
- System voice processing
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Use your iPhone/iPad as a microphone and output sound to headphones or speakers. You can also use it to record audio instead of playing sound. The app comes with four built-in effects. Stereo input is available on compatible devices only. The microphone on the iPhone is positioned vertically, so by using it in landscape orientation, you can experience a greater sense of stereo sound. Please note that this app was created just for my personal use, and I cannot guarantee its performance on devices I do not own. Voice preprocess: - System Voice Processing - Noise Reduction - Auto Gain Control Included effects: - Pitch shifter - Chorus - Reverb - 10-band equalizer Supported devices with stereo input (unconfirmed): - iPhone XS or later - iPhone SE 2nd generation or later - iPad Pro 11-inch 1st generation or later - iPad Pro 12.9-inch 3rd generation or later Recording file formats: - MPEG4 AAC 44.1kHz 192kbps Stereo (.m4a, Up to 24 hours) - MPEG4 AAC 44.1kHz 128kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 192kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 256kbps Stereo (.m4a, 24h) - MPEG4 AAC 48kHz 320kbps Stereo (.m4a, 24h) - MPEG4 AAC 44.1kHz 96kbps Stereo (.m4a, 24h) - MPEG4 AAC 32kHz 64kbps Stereo (.m4a, 24h) - PCM 44.1kHz 16bit Integer Stereo (.wav, 6h) - PCM 48kHz 16bit Integer Stereo (.wav, 6h) - PCM 44.1kHz 32bit Float Stereo (.wav, 3h) - PCM 48kHz 32bit Float Stereo (.wav, 3h) * You can add a timecode when you use a PCM format. If you are using an external stereo microphone, please set the input channel to stereo in the settings. Please note that: - The screenshots are simulated images. The actual display may differ. - This app and descriptions contain machine translated text.
Voltbridge™ for PowerVault
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PowerVault™ is the companion app for your PowerVault battery charging system. Connect to your PowerVault via Bluetooth to monitor charging activity, manage your system, and stay informed while you work. With PowerVault, you can: • Add and connect compatible PowerVault units • View charger status, charging-slot activity, and PowerVault temperature • Monitor supported battery details, including voltage, current, charge percentage, remaining capacity, cycle count, chemistry, design capacity, manufacture date, and battery health • Receive alerts for full charge, power-adapter connection changes, charging pauses, adapter errors, and other system conditions • Rename your PowerVault for easier identification • Adjust Vault Light settings, including LED on/off and brightness • Manage power-connection and full-charge alert preferences • View app, PowerVault, and Bluetooth firmware version information PowerVault is designed to help production teams keep compatible batteries and charging systems visible, organized, and ready for the next shoot. Requires a compatible PowerVault charging system and Bluetooth connection. Some battery information and features depend on the connected battery, adapter, and hardware configuration.
Screenshots
Verdict
The clearest difference is price: Voltbridge™ for PowerVault at Free against Stereo Microphone's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Voltbridge™ for PowerVault is free to download; Stereo Microphone costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stereo Microphone ships an update every 6 weeks, Voltbridge™ for PowerVault every 5 weeks. Both last shipped on October 24, 2026.
| Parameter | Stereo Microphone | Voltbridge™ for PowerVault |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.4 (9 ratings) — better | — |
| Positive reviews | 85.0% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 6 weeks | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 3 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryouta Kira | Core SWX |
In-app purchases
Stereo Microphone
No in-app purchases
Voltbridge™ for PowerVault
No in-app purchases
Questions
Is Stereo Microphone free?
Is Voltbridge™ for PowerVault free?
Do Stereo Microphone or Voltbridge™ for PowerVault have ads?
Which is updated more often, Stereo Microphone or Voltbridge™ for PowerVault?
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