UAFX Control vs Zero Fret
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UAFX Control
This app enhances the functionality of Universal Audio's stompbox effects pedals. Users can customize pedal features, manage presets, and access new functionalities through firmware updates. It offers improved Bluetooth connectivity for faster and more reliable connections.
- Customize pedal features
- Manage presets
- Bluetooth connectivity
- Firmware update support
- OX Stomp editor
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UAFX Control is the companion application for Universal Audio's line of stompbox effects pedals. You can use the app to customize pedal features and more. What's New in v3.0.5 • Fixed slider value and slider responsiveness issues What's New in v3.0.4 • OX Stomp editor and preset improvements • Other minor fixes and enhancements What's New in v3.0.2 • Minor bug fixes and improvements What's New in v3.0.1 • Bluetooth redesigned for faster connections and rock-solid reliability • Support for new features in UAFX firmware version 2.0 • (OX Stomp) Off-Axis mic states are now correctly displayed Note that UAFX firmware updates are only available using the UA Connect desktop application, available at: uaudio.com/uafx/start
Zero Fret
This app provides a visual and haptic guitar and bass tuning experience. It displays string wobble and offers tactile feedback to guide tuning adjustments, supporting a wide range of instruments and custom tunings.
- Visual string wobble indicator
- Haptic feedback for tuning guidance
- Support for guitar, bass, ukulele, and more
- Custom tuning creation and saving
- Chromatic fallback tuning
- Adjustable reference pitch
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Zero Fret is a guitar and bass tuner you can see and feel. Pluck a string and watch it wobble on screen at the rate your string is beating against the right note. Turn the peg and the wobble slows; when it stops, you're in tune. On iPhone, turn on Feel the Beat and the phone taps once per beat in your hand, so you can keep your eyes on the pegs. • Guitar: Standard, Drop D, E-flat, D Standard, DADGAD, Open G, Open D, 7- and 8-string • Bass: 4-, 5- and 6-string • Ukulele (standard, low G, D, baritone), mandolin, mandola, banjo, violin and viola • Your own custom tunings, and favorites for one-tap switching • "Too slack, tighten" and "too tight, ease off": every reading says which way to turn • Chromatic fallback for notes that aren't one of your strings • Adjustable reference pitch, A = 410 to 470 Hz • Feel the Beat and the in-tune tick need a haptic engine: every supported iPhone has one, iPad does not • No accounts, ads, analytics or subscriptions • Works without a network connection • Free and open source: github.com/phall1/zero-fret Audio is processed live on your device. It is never recorded, stored or transmitted. The microphone runs only while Zero Fret is on screen and stops when you leave the app.
Screenshots
Verdict
The clearest difference is rating: Zero Fret at 5.0 against UAFX Control's 2.0. Zero Fret also leads on ads (none vs shown) and update cadence (daily vs every 3 weeks). UAFX Control's advantage is ratings volume (27 vs 1) and iOS requirement (13.0 vs 17.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Zero Fret holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: UAFX Control has 27 ratings behind it against 1, so its average is the more settled of the two.
UAFX Control ships an update every 3 weeks, Zero Fret daily. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | UAFX Control | Zero Fret |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (27 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 9.2% of reviews | — |
| Number of ratings | 27 — better | 1 |
| Update frequency | Every 3 weeks | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 60 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Universal Audio | Patrick Hall |
Customer experience
UAFX Control
Zero Fret
Bugs and requests
UAFX Control
Reported bugs
4 issues- App crashes after firmware updates
- Pedals not detected or recognized by app
- Registration process often fails
- Bluetooth connection randomly drops
Requested features
4 requests- Ability to freely assign pedal buttons
- Option to view and edit preset settings
- MIDI support for preset changes
- Landscape mode support on iPad
Zero Fret
Not enough reviews yet to summarise bugs or requests.
In-app purchases
UAFX Control
No in-app purchases
Zero Fret
No in-app purchases









