Fan vs sound machine: how a real fan, a machine and a phone app compare
Updated
A real fan gives you a steady sound and moving air. A sound machine gives you the sound only, usually with more sound choices and a timer. A phone app also gives you the sound only, with no extra device to buy or plug in. If you want the breeze, you need the fan. If you only want the background sound, a machine or an app is enough.
The three options side by side
| Real fan | Sound machine | Phone app | |
|---|---|---|---|
| Moves air | Yes | No | No |
| Source of the sound | The fan itself, running | A recorded or generated sound, or a small internal fan in fan-based models | A recording or a generated sound, varies by app (Fan Noise: recordings) |
| Sound choices | One: the sound of that fan | Often several, varies by model | Several, varies by app (Fan Noise: five fans) |
| Loop | None, it just keeps running | Recorded samples repeat; fan-based and generated-noise models may not, varies by model | Recordings repeat; generated sounds may not, varies by app |
| Timer | Only if the fan has one or you add a plug-in timer | Common, varies by model | Depends on the app |
| Power | Mains electricity, or a battery or USB in small fans | Plug or batteries, varies by model | Your phone's battery |
| Portability | Most fans are bulky and plugged in | Small, but one more thing to pack | Already in your pocket |
| Extra cost | The fan | The machine | Free or paid, depending on the app |
The table is general. A particular fan, machine or app can differ, so check the one you're considering.
Where each one makes sense
A real fan makes sense when the room is warm and you want air moving. Its sound also never repeats, because nothing is being played back. The trade-offs are the same as any appliance: it uses electricity, it takes up space, and the air it moves can be unwelcome when it's cold.
A sound machine suits you if you want the sound without any airflow, or you want a choice of sounds. Many machines have a timer and a volume knob. It's another device to buy, place near the bed and keep powered.
A fan-based sound machine is the hybrid. Instead of playing a recording, it makes its sound with a small fan inside the housing, so you get a real fan sound without a fan blowing across the bed. If you want a fan sound but not a breeze, look for this kind and check the model's description, since designs differ. It's still a device to buy and keep powered, and it won't cool the room. Our guide to fan noise without airflow covers that trade-off.
A phone app is the easy way in when you already have the phone next to you and want to try a fan sound before buying hardware, or when you travel. The limit is the phone: it plays through its own speaker or whatever you connect, and it runs on the phone's battery.
Is a sound machine better than a fan for sleep?
There isn't good evidence that one is better than the other. A 2021 systematic review of 38 articles on continuous white and similar broadband noise (Riedy and colleagues, Sleep Medicine Reviews) found variable results, from noise improving sleep to disrupting it. The authors rated the quality of evidence that continuous noise improves sleep as "very low". The review looked at noise in general, not at fans compared with sound machines, so it can't tell you which of the two to pick. For more on that, read our guide to fan noise for sleeping.
What a fan sound loop is like
A real fan has no loop: it keeps making sound for as long as it's on. A recording has to repeat. Fan Noise repeats each of its sounds until you pause it or the timer ends it, and it keeps playing with the screen locked. If you want to know what you're hearing in the first place, our guides on whether a fan is white noise and on box fan white noise cover it.
Use a fan sound on your iPhone
Fan Noise plays five fan recordings. Classic Ceiling Fan, Modern Tower Fan and Window Box Fan are free. Industrial Fan and Quiet Breeze are Premium.
- Open the Sounds tab and tap Change sound.
- Pick a fan and go back to the player screen.
- Move the Volume slider, then tap the round play button.
- Optional: under Sleep timer, set the Fade-out menu to 30s, 1m, 2m or 5m, then tap 15m, 30m, 1h or 2h to start the timer.
The sounds are stored in the app, so they play offline. There are no ads and no account. The app only plays its five fan recordings: it doesn't generate other kinds of noise, it doesn't move air, and it doesn't track sleep.
This guide is general information, not medical advice. Fan Noise provides background sound for sleeping or concentrating and isn't a treatment. If you have a health concern, talk to a doctor.
FAQ
- Is a white noise machine better than a fan?
- It depends on what you want from it. A machine gives you a steady sound with no airflow, a fan gives you both. On sleep, a 2021 systematic review of 38 articles (Riedy, Sleep Medicine Reviews) rated the quality of evidence that continuous noise improves sleep as very low, and it didn't compare fans with sound machines.
- Fan vs noise machine: which one moves air?
- Only the fan. A sound machine or a phone app plays a sound and doesn't cool the room.
- Can a phone app replace a fan?
- For the sound, it can. Fan Noise for iPhone plays recordings of five fans and loops them. It doesn't move any air, so it won't replace a fan on a hot night. More in our guide to [fan noise without airflow](/fan-noise/fan-noise-without-airflow).
- Does a fan sound loop?
- A real fan doesn't loop, it just keeps running. A recording does repeat, and Fan Noise repeats each sound until you pause it or the sleep timer ends it.
- How do I turn the fan sound off automatically?
- In Fan Noise, pick a time under Sleep timer on the player screen: 15m, 30m, 1h or 2h. You can set the Fade-out to 30s, 1m, 2m or 5m first, so the sound tapers instead of stopping.
- Does Fan Noise work offline?
- Yes. The fan recordings are stored in the app, and it has no ads and no account.