Ultrasonic Analyzer vs Koala Sampler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ultrasonic Analyzer
This app provides real-time audio analysis with visual representations of sound frequencies. It allows users to listen to and analyze ultrasounds, with options for transposed playback and slowed-down analysis of inaudible sounds. It supports various sampling rates and offers detailed charting and measurement tools.
- Real-time spectrum analysis
- Spectrogram and oscilloscope views
- Octave RTA analyzer
- Transposed ultrasound listening
- Slowed-down playback
- High sampling rates up to 384kHz
- Zoom and pan capabilities
Read full descriptionHide full description
Ultrasonic Analyzer is a real-time spectrum, spectrogram, oscilloscope, and octave RTA analyzer for your iPhone or iPad. It provides a visual representation of ultrasounds using a sampling rate of up to 384kHz**. You can listen to transposed ultrasounds* and analyze them in real time. For sounds that are normally inaudible, a slowed-down playback option is also available. Ultrasonic Analyzer can be used to analyze the calls of various animals (e.g., bats, dolphins), measure the frequency response of high-end audio equipment, or evaluate ultrasonic sensors. Additionally, it allows you to analyze short imported audio files within a spectrogram context. Features - Sampling rates: 44.1kHz, 48kHz, 96kHz, 192kHz, 200kHz, 250kHz, 384kHz** - Real-time transposed ultrasound listening during recording* - Spectrogram analyzer: Color and black & white modes - Spectrum analyzer - Oscilloscope (full FFT window size) - Octave RTA analyzer: Bands – full, 1/3, 1/6, 1/12 (RMS values) - Max/min Octave RTA values - dBFS Meter - Fast real-time response - Adjustable spectrogram frequency resolution - Configurable time interval between FFT computations, with values as low as 1ms or even lower - Fast Fourier Transform (FFT) - FFT window sizes: 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 - Recording trigger: Automatically triggers based on specified frequency bands - Zoom and pan capabilities for all charts - Measurement tools available in all charts - Playback analysis - Transposition during playback - Slow-down playback: Transpose octaves down for easier analysis - Picture-in-Picture (PIP) mode: Allows simultaneous spectrogram analysis with a secondary chart (Octave RTA, Spectrum, or Oscilloscope) - Audio input support: Built-in microphone, external microphone (via USB camera adapter or iPhone/iPad dock connector – Core Audio compliant devices) - Sharing options: Share charts and audio recordings via email, social networks, or clipboard - Exporting capabilities: Save audio recordings (WAV) and image charts (PNG) to iOS Document Browser - Audio file import: Load short audio files from other apps or the iOS Document Browser - Supported audio formats: WAV, CAF, AAC, MP3 - Automatic sample rate conversion for imported files - Frequency scale options: Linear and logarithmic - Amplitude scale options: Linear and logarithmic (dBFS) - dBFS Meter weighting: dBZ (linear) - Adjustable spectrogram length (dependent on resolution settings) Tested with (via USB adapter): - Dodotronic Ultramic200K, Ultramic250K, Ultramic384K - Pettersson M500-384 - Avisoft UltraSoundGate 116Un Make sure you are using the latest iOS update. *Requires an external microphone with ultrasonic capabilities connected via a USB adapter. **Real-time analysis at a 96kHz sample rate or higher is only possible with an external USB microphone. Alternatively, you can import files recorded on an external device for non-real-time analysis.
Koala Sampler
Record sounds, create beats, and produce tracks with this intuitive pocket sampler. Transform audio with built-in effects and export your creations in professional quality. Ideal for instant music-making on the go.
- Record and load up to 64 samples
- Transform sounds with 16 built-in effects
- Create beats with a high-resolution sequencer
- Export loops and tracks as WAV files
- AUv3 and MIDI compatibility
- AI-powered sample separation
Read full descriptionHide full description
Koala is the ultimate pocket-sized sampler. Record anything with your phone's mic or load your own sounds. Use Koala to create beats with those samples, add effects and create a track! Koala's super intuitive interface helps you make a track in a flash - there is no brake pedal. You can also resample the output of the app back into the input, through the effects, so the sonic possibilities are endless. Koala's design focuses totally on making the music-making process instant, keeping you in the flow and keeping it fun, not getting bogged down by pages of parameters and micro-editing. "Been putting that $4 koala sampler to good use lately. Undeniably great tool that puts some of these expensive beat boxes to shame. A must cop." -- flying lotus, twitter * Record up to 64 different samples with your mic * Transform your voice or any other sound with 16 superb built-in fx * Load your own samples * Choose from one of 250 built-in sounds * Resample the output of the app back into a new sample * Export loops or entire tracks as professional quality WAV files * Direct export to Ableton Live Set * Copy/paste or merge sequences just by dragging them * Create beats with the high-resolution sequencer * Import samples from the Files app or even from videos * Keyboard mode lets you play chromatically or one of 9 scales * Quantize, add swing to get the right feel * Normal/One-shot/Loop/Reverse playback of samples * 6 Choke groups * Attack, release and tone adjustable on each sample * Mute/Solo controls and note repeat * Add any (or all) of the 16 effects to the entire mix * AUv3 compatible - use in GarageBand, Logic, Cubasis etc etc * MIDI controllable - play your samples on a keyboard, map the effects to knobs * Jam with others over WiFi with Ableton Link * Free copy of Ableton Live Lite included * AudioShare compatible * Use AI to separate samples into individual instruments (drums, bass, vocals and other) * Set your own background image and choose from a growing list of background visual FX 8 Built-in Microphone FX: * More Bass * More Treble * Fuzz * Robot * Reverb * Octave up * Octave down * Synthesizer 16 Built-in DJ Mix FX: * Bit-crusher * Pitch-shift * Comb filter * Ring modulator * Reverb * Stutter * Gate * Resonant High/Low Pass Filters * Cutter * Reverse * Dub * Tempo Delay * Talkbox * VibroFlange * Dirty * Compressor Features included in SAMURAI In-App Purchase * Pro-quality Timestretch (5 modes: Modern, Retro, Beats, Re-pitch and Cyclic) * Piano roll editor * Auto-chop (auto, equal, and lazy chop) * 3 Band EQ * Pocket operator sync out * Quokka Synth - powerhouse polyphonic synthesizer * MIDI Out - control external MIDI hardware with Koala's sequencer * Chopper - multimodal sample chopping instrument Features included in MIXER In-App Purchase * Mix your beats professionally with a 4 channel mixer + main bus * Route any sample to any channel * Mute/solo, faders and accurate metering on every channel * 5 effect slots per channel * 29 high-quality effects - compressors, filters, phasers and more, with new effects to come * Host AUv3 plugins - both audio effects and instruments
Screenshots
Verdict
The clearest difference is price: Koala Sampler at $4.99 against Ultrasonic Analyzer's $19.99. Koala Sampler also leads on rating (4.8 vs 3.9) and review sentiment (88% vs 56%). Ultrasonic Analyzer's advantage is in-app purchases (none vs 7) and iOS requirement (12.4 vs 15.0). On ads, monetization model 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
Ultrasonic Analyzer costs $19.99 and Koala Sampler $4.99 up front. Koala Sampler sells 7 one-off in-app purchases. Ultrasonic Analyzer asks for nothing beyond the download.
Koala Sampler holds the better App Store score, 4.8 against 3.9. That said, the two scores are not equally well evidenced: Koala Sampler has 1.5K ratings behind it against 35, so its average is the more settled of the two. Written reviews point the same way: 56% of Ultrasonic Analyzer's written reviews are positive against 88% of Koala Sampler's.
Ultrasonic Analyzer ships an update every 4 months, Koala Sampler every 3 weeks. Both last shipped on November 6, 2026.
| Parameter | Ultrasonic Analyzer | Koala Sampler |
|---|---|---|
| Price | $19.99 | $4.99 — better |
| Rating | 3.9 (35 ratings) | 4.8 (1.5K ratings) — better |
| Positive reviews | 55.9% of reviews | 88.3% of reviews — better |
| Number of ratings | 35 | 1.5K — better |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Best chart rank | — | #5 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.4 — better | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | DEXUS Pawel Krzywdzinski | Mazbox Limited |
Customer experience
Ultrasonic Analyzer
Koala Sampler
Bugs and requests
Ultrasonic Analyzer
Not enough reviews yet to summarise bugs or requests.
Koala Sampler
Reported bugs
3 issues- Samples not loading or disappearing after app updates
- Sequencer timing and quantization issues
- Crashes when using certain features or with large projects
Requested features
5 requests- Ability to record and edit MIDI sequences
- More comprehensive effects and sound processing tools
- Improved sample management and organization features
- Support for external MIDI controllers and hardware integration
- Customizable color schemes and UI themes
In-app purchases
Ultrasonic Analyzer
No in-app purchases
Koala Sampler
- Ese-O's Sample Pack$2.99
- Solar Studies Samplepack$2.99
- Soon Come Dub Sample Pack$2.99
Show 4 moreShow fewer
- Analog Astronaut Samplepack$2.99
- Cirrus Cuts Sample Pack$2.99
- Samurai Edition$3.99
- Mixer$4.99
Questions
Is Ultrasonic Analyzer free?
Is Koala Sampler free?
Which has better reviews, Ultrasonic Analyzer or Koala Sampler?
Do Ultrasonic Analyzer or Koala Sampler have ads?
Which is updated more often, Ultrasonic Analyzer or Koala Sampler?
Other comparisons















