Sing vs NLogSynth PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sing
Visualize your singing or instrument playing pitch with a color-coded graph. This app analyzes audio input to show if you are on, sharp, or flat, helping you train your ear for accurate intonation.
- Color-coded pitch graph
- Real-time audio analysis
- Visualizes pitch accuracy
- Supports singing and instruments
- Pitch frequency spectrum display
- Monophonic pitch detection
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Can you sing in tune? Learn to sing (or play an instrument) accurately in tune with HotPaw Sing-inTuna's color-coded pitch graph. Sing-inTuna uses the built-in microphone on your iPhone or iPad to analyze and help you visualize if you are singing, or playing a musical instrument (such as a violin), precisely on the right pitch. It graphs pitch on a scrolling graph resembling a musical Grand Staff. Tones that are on-pitch (+-20 cents) are colored green; notes slightly sharp: red; notes a pinch flat: blue. You can also display an optional pitch frequency spectrum of your voice to see your timbre. Sing-inTuna requires a quiet environment with no accompaniment or harmony, and monophonic pitches that are at least a quarter second long. The pitch range using the built-in mic is about +-2 octaves from middle-C, depending on microphone use, loudness, and timbre. Note: This app produces no sounds and shows no sheet music. It only listens so that you can see your pitch, and how well your pitch matches that of a well tuned equal-temperament instrument.
NLogSynth PRO
This app is a professional virtual analog synthesizer for iOS, offering a low-latency sound engine with extensive editing capabilities. It supports various inter-app audio and MIDI protocols, allowing for integration with DAWs and external controllers. Create and export custom sounds and recordings with studio-quality audio.
- Virtual analog low-latency sound engine
- Extensive sound editing with over 150 parameters
- Support for AudioUnit v3, AudioBus 3, Inter-App Audio
- Full MIDI implementation and Core MIDI compatibility
- Studio quality 44.1 kHz Stereo CD quality audio
- 224 factory sounds and user banks
- Multi-effect section with delay, chorus, reverb, and more
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Professional Virtual Analogue Synthesizer supporting AudioUnit v3, AudioBus 3, Inter-App Audio and Core MIDI compatible apps & interfaces. Versatile iOS synth with professional grade virtual analogue low latency sound engine: - Play it from on-screen keyboard - Use MIDI keyboards & controllers via MIDI interfaces - Connect to your digital audio workstation via MIDI interfaces - Play NLogSynth from other iOS apps using virtual Core MIDI - Synchronize NLog via MIDI Clock to other apps or devices - Make audio or MIDI recordings on the run and share your files - Export patches & recordings Supports external MIDI input and output via CoreMIDI compatible interfaces and class compliant USB MIDI interfaces. Full MIDI implementation including velocity control, pitch bend, sustain pedal, modulation wheel, program & bank change, polyphonic after touch, channel pressure and assignable midi controller & MIDI Sync receiving mode. ::: Follow @nlogmusic at Twitter! ::: ::: Featured in How to Make a Noise: iPad Synthesizers Edition (http://noisesculpture.com/ipad) the most widely read synthesizer book ::: - 224 IMPRESSIVE FACTORY SOUNDS - including fresh new sound set by the producer 7 Skies - ENDLESS options for SOUND EDITING - Over 150 parameters - 3 user banks with 96 slots - STUDIO QUALITY sounds - Professional 44.1 kHz Stereo CD quality - 32bit floating point engine - Highly efficient algorithms - STAGE safe KEYBOARD implementation - SLIDING & LOCK option - Double manual option - POLY, MONO & LEGATO modes - Velocity control - Different key sizes - Fully customizable EXPRESSION CONTROL - Realistic PITCH BEND and MOD WHEEL implementation - X/Y dimensional controller - 4 customizable PERFORMANCE knobs - Keyboard with VERTICAL modulation control - Incredible FAT & RICH: - New filter implementation for SMOOTH and JUICY control with 7 FILTER types - UNISONO mode for up to 4 parallel sounds with detune, delay and panning control === SOUND editing features === - 4 Oscillators with 20 waveforms: - classic analogue SIN, SAWTOOTH, TRIANGLE and SQUARE - 16 additional carefully designed wavetables - True PWM pulse-width modulation - Frequency mod - Ring mod - Noise generator - 2 Filter with 7 filter types - Low, High & Band Passes - Finest sweeps & smoothest cutoff tuning - Carefully resonating - 12 & 24dB option for steepness - 4 ADSR Envelope generators - Velocity controlled attack time - Slope control - 4 Modulation LFOs - Sample & hold - Fade in delay - Modulation Matrix - 4 Modulation slots each modulating 3 destinations - Multi-effect section - Stereo delay with x-feed & filter - chorus - flanger - phaser - distortion - reverb - parametric EQ
Screenshots
Verdict
The clearest difference is rating: NLogSynth PRO at 4.6 against Sing's 3.0. NLogSynth PRO also leads on review sentiment (83% vs 63%) and ratings volume (33 vs 2). Sing's advantage is price ($4.99 vs $8.99) and device support (3 vs 1). On ads, in-app purchases and monetization model 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
Sing costs $4.99 and NLogSynth PRO $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
NLogSynth PRO holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: NLogSynth PRO has 33 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 63% of Sing's written reviews are positive against 83% of NLogSynth PRO's.
Sing ships an update every 6 months, NLogSynth PRO every 2 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.
| Parameter | Sing | NLogSynth PRO |
|---|---|---|
| Price | $4.99 — better | $8.99 |
| Rating | 3.0 (2 ratings) | 4.6 (33 ratings) — better |
| Positive reviews | 62.5% of reviews | 83.1% of reviews — better |
| Number of ratings | 2 | 33 — better |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | HotPaw Productions | tempo rubato |
Customer experience
Sing
NLogSynth PRO
In-app purchases
Sing
No in-app purchases
NLogSynth PRO
No in-app purchases









