Device

Benchmark and check the hardware of this device.

CPU & GPU: 10-second single- and multi-core CPU stress and a GPU compute stress test, with FLOPS/GFLOPS scores.
Display & pixels: Measure rendered frames-per-second and refresh rate (Hz), and run a full-screen dead/stuck-pixel test.
Speaker & mic: Hardware checks for the speakers and microphone: left/right channel tone tests, and a live mic input meter with record/playback.
Thermal & battery: Sustained-load heating and throttling curve, plus battery drain rate under load and projected runtime.
Hardware & Radio: A full read-out: CPU, GPU, RAM, display, battery, cellular, Wi-Fi and Bluetooth.
Signal Generator: Pure tones, white/pink noise and a 1 Hz–20 kHz sweep.
Sound Meter & Spectrum: A calibrated dB SPL meter and a real-time FFT spectrum analyzer (RTA).
Speaker & Sub + DSP: Sweep a speaker's frequency response and resonance, then design crossovers, parametric EQ and gain.

CPU & GPU Test

Benchmarks how much work this device's processor and graphics can do, and whether it can keep it up.

What It Measures: The CPU run scores integer and floating-point work on every core at once; the GPU run scores how many frames the graphics hardware can render under a fixed load. CPU 1 842 · GPU 4 310
Why a Second Run Scores Lower: A phone throttles as it warms up, so a repeat run right after the first is meant to come out lower. That drop is the interesting number — it tells you how long the device can hold full speed. run 1: 1 842 · run 2: 1 610

Loads every core continuously and watches how the device sheds the heat.

What It Does: Keeps all cores busy and samples the system thermal state as it climbs, so you can see at what point the device starts protecting itself. nominal → fair → serious
It Will Get Warm: That is the test working, not a fault. Stop it if the device becomes uncomfortable to hold, and let it cool before running it again — a warm start makes the result meaningless.

Tracks charge level, temperature and drain rate over time under a load you choose.

What It Measures: Samples the charge percentage at intervals and works out the drain per hour, so you can compare a real workload against idle. −7 %/h idle · −23 %/h under load
Give It Time: The system reports the battery level in whole percent, so a short run cannot see a trend. Twenty minutes is the least that produces a number worth reading.

Everything the system will tell us about this device and the radios it is using right now.

Hardware: Model, chip, core count, memory, screen size and resolution, and the storage actually free — read from the system, not guessed.
Radio: The current Wi-Fi and cellular state: the network in use, signal strength where the system exposes it, and the carrier. Some of these are only readable while the app is in the foreground.

Pushes a high-motion scene to your screen and measures how many frames per second it really renders.

FPS Test: A full-screen animation runs while a frame counter measures the live and peak frames per second your display delivers. Peak 120 FPS on a ProMotion panel
Refresh rate & resolution: Shows the panel's maximum refresh rate in Hz and its true native pixel resolution. 120 Hz · 2556 × 1179
What to look for: On a 120 Hz iPhone the test should reach ~120 FPS and look glass-smooth. A low peak or stutter can mean thermal throttling or heavy background load.

Fills the screen with one flat colour at a time so a stuck or dead pixel has nowhere to hide.

How to Use It: Tap to step through the colours and look closely at each. A dead pixel stays black on every one; a stuck pixel stays one colour on all of them. red → green → blue → white → black
Getting Out: The close button is in the corner. Clean the screen first — dust reads exactly like a stuck pixel.

Check that your iPhone's mic captures sound — watch the live input level, then record and play it back.

Live input meter: The meter reacts to sound in real time. Speak or tap near the mic and the bars should jump green → amber. Silence ≈ empty · Speaking ≈ green→amber
Record & play back: Records a short clip, then plays it through the speaker so you hear exactly what the mic captured. Record → talk → Stop → Play
What it proves: Meter moves and playback is clear → the mic and its routing work. No movement → check for a blocking case or a hardware fault.

Play test tones to confirm your speakers work, aren't muffled, and that both stereo channels sound.

Test tone: Plays a continuous tone. Low tones test bass; high tones reveal rattles or a blocked grille. 60 Hz bass · 1 kHz mid · 12 kHz treble
Left / Right: Sends the tone to just one channel so you can confirm both stereo speakers play. Left only → one speaker · Right only → the other
What to listen for: A clean, steady tone is good. Buzzing, crackle or silence on one side points to dust, damage or a stuck channel.

Plays a known signal through the speakers so there is something exact to listen to, or to measure against.

Four sources: A pure tone at any frequency, white noise, pink noise or a sweep across the whole band, with each channel mutable on its own. Tone 1 kHz, left only
Sweeps: The start frequency, the end frequency and the duration are adjustable; logarithmic spends more time low down, linear spreads it evenly.

Turns the microphone into a sound-level meter, with the minimum and the peak held on screen.

Level, min and peak: The big number is the current level, while MIN and PEAK hold the quietest and loudest moments until they are reset. 62 dB · MIN 41 · PEAK 88
Why it needs calibrating: Phone microphones are not calibrated instruments, so the offset slider lines this meter up with a reference one.

Shows what the microphone hears split by frequency, so a sound can be seen rather than guessed at.

Reading the curve: Frequency runs left to right from 20 Hz to 20 kHz and level bottom to top, so a hum is a spike low down and hiss a raised shelf up high. Spike at 50 Hz = mains hum
Peak hold: The curve is smoothed to stay readable, and a separate line holds the peaks long enough to catch a resonance that comes and goes.

Designs a crossover and an equaliser band and draws the resulting response, before anything is set on real hardware.

Filters: A high-pass, a low-pass and one peaking band with slopes of 12, 24 or 48 dB per octave, and the curve is the real maths of those filters rather than a sketch. HPF 80 Hz, 24 dB/oct
What it is for: Working out the settings for an amplifier, an active crossover or a subwoofer without cycling through them on the device itself.

Plays a sweep and records it back through the microphone to draw how a speaker or a subwoofer actually responds in the room.

The measurement: Full-range covers 20 Hz to 20 kHz and the subwoofer range zooms into 20–250 Hz, with the loudest frequency called out as the resonance. Resonance / loudest: 46 Hz
The room is in the result: What is measured is the speaker and the room together, so peaks and dips move as the phone moves; the listening position is the one that counts.

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