Line Hum vs Air Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Line Hum
This audio unit plugin adds authentic analog noise and distorted wave forms to your music productions. It can drone on any frequency and ring modulate input for added distortion, offering a unique sound for electronic music creators.
- Authentic analog noise
- Synthesized analog instruments
- Noisy wave forms
- Drones on any frequency
- Ring modulation
- Distortion effects
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Your mix is full of synthesized analog instruments - but something is missing! YES! THE SOUND OF A CABLE LYING ON THE FLOOR SOMEWHERE NEAR AN ELECTRIC LINE. Line Hum gives you this missing piece of Analog authenticity, As well as a variety of noisy wave forms, this Audio Unit is also able to just sit there and drone on any frequency and ring modulate its input for added distortion. It's actually pretty useful, especially when you run a bunch of them serially or in parallel. Because this is an Audio Unit, you need to run the (non functioning) Line Hum app to install it.
Air Synth
Transform your phone into a motion-controlled musical instrument. Explore a simplified mode for younger users or dive into advanced synthesis features. Experience expressive soundscapes controlled by your movements.
- Motion-controlled pitch and effects
- Camera, gyroscope, and accelerometer tracking
- Adjustable sensitivity settings
- Diverse expressive presets
- Advanced synthesis parameters (oscillators, LFO, filters)
- Simplified mode for kids
- Save custom presets
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Air Synth transforms your phone into a motion-controlled instrument. It offers a fun, simplified mode for kids and an advanced mode for synthesizer enthusiasts. Note: This app requires good lighting for optimal motion tracking. FEATURES * Motion tracking based on camera, gyroscope and accelerometer * Movement-controlled pitch, effects controlled by tilt * Sensitivity settings for both movement and tilt * A diverse range of expressive presets * 4 oscillators * LFO, filter, envelopes, tremolo, reverb and delay * Free pitch and a wide range of scales * Save your presets * Simplified mode for kids
Screenshots
Verdict
The clearest difference is rating: Air Synth at 5.0 against Line Hum's 4.8. Air Synth also leads on update cadence (every 2 months vs every 4 months). Line Hum's advantage is ratings volume (6 vs 1) 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
Line Hum costs $0.99 and Air Synth $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Air Synth holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Line Hum has 6 ratings behind it against 1, so its average is the more settled of the two.
Line Hum ships an update every 4 months, Air Synth every 2 months. The most recent releases landed on October 13, 2026 and September 23, 2026 respectively.
| Parameter | Line Hum | Air Synth |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 4.8 (6 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | 1 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.4 — better | 17.6 |
| Further details — not scored | ||
| Size | 13 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Henry Lowengard | Air Dev |
Customer experience
Line Hum
Air Synth
In-app purchases
Line Hum
No in-app purchases
Air Synth
No in-app purchases
