Aethron vs CosyHours
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Aethron
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Aethron is a minimal oscillator instrument for observing sound as waveform. Rather than a full music production app, Aethron is designed as a small sonic device for touching, layering, and reshaping oscillating sound. Add oscillators, tune frequency and amplitude, switch waveforms, invert polarity, sync phases, randomize signal states, and store the sounds you discover. Features * Multiple oscillators * SINE / SAW / TRI / SQR waveforms * Frequency and amplitude control * Fine frequency adjustment * SUM / SPLIT waveform display * RANDOM signal generation * POL +/- polarity inversion * SYNC phase reset * SOLO monitoring * STATES / STORE for saving setups * Automatic restoration of the last oscillator state Aethron is not a conventional synthesizer or a waveform viewer. It is a small instrument for touching invisible vibration through sound and waveform.
CosyHours
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Cosy Hours plays music that is being made as you listen. Nothing in it is a recording β no samples, no loops, no audio files anywhere in the app. Every note is synthesised on your device as it is played, so it will not repeat for as long as you leave it running. Put it on to work to, to study to, or to fall asleep to. THE SHELF Lofi records, each a different band rather than a different filter: a Rhodes on a balcony, brushes and vibraphone in the rain, nylon guitar over an upright bass, a koto, a choir. Chiptune sides for an arcade. And beds with no notes in them at all β ocean, forest wind, rain on glass, noise, a singing bowl, temple bells. Nothing loops, so nothing wears out. THE CHILL BAR One slider, AWAKE to ASLEEP. Tempo, swing, tone, reverb, density and even the lead instrument move together, and the tempo glides rather than jumps β so it sounds like the track settling rather than a track being changed. THE ROOM Behind the music is a hand-drawn pixel room: a woman on a sofa with a mug of coffee, a record turning, a tabby asleep at her feet, rain on the window and a city beyond it. She breathes, she blinks, her fingers tap, the coffee steams. Nothing is interpolated; every frame is a drawing somebody made. The room follows your clock from dawn to night, and the clock on the wall tells the actual time. THE POMODORO Focus and break lengths you choose, and a chime with no strike anywhere in it, so there is nothing to flinch at. The record can stop for your break and start again afterwards. The countdown sits on the Lock Screen and in the Dynamic Island, counted by the system's own clock, so it stays right even while the app is asleep. QUIET BY DEFAULT Everything runs on your device. No account, no subscription, no ads, no tracking and no network connection of any kind β there is nothing to collect, because nothing is ever sent. It keeps playing with the screen off, and it works with no signal at all.
Screenshots
Verdict
The clearest difference is price: Aethron at Free against CosyHours's $0.99. CosyHours's advantage is iOS requirement (17.0 vs 26.5). On ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Aethron is free to download; CosyHours costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Aethron | CosyHours |
|---|---|---|
| Price | Free β better | $0.99 |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 26.5 | 17.0 β better |
| Further details β not scored | ||
| Size | 2 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Naoto Suetsugu | Junki Omura |
In-app purchases
Aethron
No in-app purchases
CosyHours
No in-app purchases





