Sweep: Speaker Tuning
Frequency response, untethered
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Plot your speaker's frequency response from your listening position. No laptop, no audio interface, no mic stand — just your iPhone. On-device, no account, free.
See how your speakers really sound.
Sweep plays a log sweep through your speaker and plots its frequency response — measured from your listening position. No laptop, no audio interface, no mic stand. Just your iPhone, a calibrated mic, and a clear picture of what you're hearing.
The untethered scout between full bench sessions — the fast check from your chair you'll actually run. A minute, not an afternoon.
SWEEP. CAPTURE. COMPARE.
• Sweep — tap once and a 20 Hz–20 kHz log sweep plays through your speaker (the Farina ESS method the bench tools use).
• Capture — a calibrated measurement mic (Dayton iMM-6C, miniDSP UMIK-1/UMIK-2/EARS, Behringer ECM8000, or any REW .cal file) or your iPhone's built-in mic records it; on-device math extracts the impulse response and plots the curve.
• Compare — overlay up to 5 runs, each its own color, to see exactly what a change did. Measure, adjust, measure again.
ALSO IN THE APP
• Scrub any frequency — drag the cursor; it snaps to peaks and troughs and reads frequency · dB right where you need it.
• Real smoothing — 1/24 to 1/3-octave, so you see the actual ripple, not a prettied-up line.
• Set levels with confidence — a built-in test tone and live meter get your output where it should be before you measure.
• Share your capture — export the chart as a labeled image card: color-coded traces, an optional cursor callout, one tap to send anywhere.
HONEST BY DESIGN
Sweep shows relative frequency response — the shape you need to tune speaker DSP and EQ. A time-gate isolates the direct sound; the low end reflects your room, and the chart marks that region plainly. Results are only as calibrated as the mic file you import. Not an SPL meter, not a full bench replacement — it names its limits up front, so you can trust its strengths.
PRIVATE BY DEFAULT
Everything runs on your device. No account, no signup, no cloud, no tracking, no analytics SDK. Your measurements and audio are processed entirely on iPhone and never leave it.
Free. No in-app purchases, no account.
Sweep is part of a family of focused instruments alongside Pull, Grip, Lean, and Level.
Ratings & Reviews
Bring your own mic. Sweep now reads miniDSP UMIK-1, UMIK-2, EARS, Behringer ECM8000, and REW-style .cal files — alongside the one-cable Dayton iMM-6C. Chart scrubbing feels quicker too. Thanks for measuring with Sweep.
The developer, Carl Sieber, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Carl Sieber
- Size
- 1.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026, Carl Sieber