Does a third-party keyboard take up a lot of storage on iPhone?
What actually makes a keyboard app large or small — sampled audio and photo-realistic themes, not the code or the typing itself — and exactly where to check the real number on your own phone.
It is a fair question to ask before installing anything new, especially on a phone that is already tight on space: a keyboard with a whole wardrobe of sounds and themes sounds like it should be big. Whether it actually is comes down to how those sounds and themes are built, not to how many of them there are.
What actually makes an app big
On almost any iPhone app, the program code is a small slice of the total size. What moves the number is which assets travel with it — photos, recorded audio, video, fonts. A keyboard is a plain-text tool at its core, so typing itself costs nothing to store. The size question is really a question about how the keyboard builds its sound and its look.
Where sound usually adds the most
A keyboard offering many click sounds has to store that sound somehow. One way is to record real switches and ship the samples: dozens of short audio files, often several per sound so the same click does not repeat identically on every press, and that adds up quickly even at a modest quality. A keyboard that synthesises its clicks in code instead skips all of that — the sound is generated the instant you press the key rather than played back from a stored file, so it costs close to nothing in the download.
Where images usually add the most
Themes are the other common cost. A theme built from photographed keycap textures is an image file, and a wardrobe of dozens of them at a decent resolution adds up the way a photo album does. A theme built from a handful of numbers instead — a backdrop colour, a key fill, a pressed-state colour, a corner radius, a text colour — costs almost nothing to store, because there is no picture to keep, only values a stylesheet reads to draw the keyboard fresh each time.
Emoji, kaomoji and fancy text cost almost nothing
These are text, not pictures, on any keyboard that builds them properly. An emoji is a character the iPhone’s own system font already knows how to draw — the same one Messages uses — so a keyboard offering hundreds of them ships a list of characters, not hundreds of tiny images. Fancy text styles work the same way: each style is a different set of Unicode characters standing in for the letters you type, not a separate image font bundled with the app.
A photo background is the one real exception
If a keyboard lets you set your own photo behind the keys, that photo genuinely uses space — but it is one you added yourself after installing, not something baked into the download, and a keyboard built carefully downsamples it once on import rather than keeping it at full camera resolution.
How to check the real number on your own phone
- Before installing, the App Store product page for the app lists its download size.
- After installing, Settings → General → iPhone Storage, find the app in the list and tap it. That shows the actual current size on your phone, not an estimate.
- If that number has grown well past the original download size, something inside the app is accumulating data — most often a saved photo background or a cache — which is worth knowing regardless of which keyboard it is.
Where Kibo fits
Kibo’s key sounds are synthesised rather than sampled from a stock library, and its themes are built from a handful of parameters — the backdrop, the key fill, the pressed state, the corner radius, the text colour — rather than photographed keycap textures. Its emoji, kaomoji and fancy text styles are text, not image assets. The one thing that does use real space is a photo background you choose to set yourself, and Kibo downsamples it once on import so the extension never touches the full-resolution original. It is free to download.
Frequently asked questions
Does having more themes or sounds mean a bigger download?
Only if those themes and sounds are stored as photos and recorded audio. A keyboard that generates its sounds and draws its themes from a handful of colour values instead can offer a large wardrobe of both without the size growing the same way.
How do I check exactly how much storage a keyboard app is using?
Settings → General → iPhone Storage, then tap the app. That shows the actual current size on your phone rather than the download size listed on the App Store, which is worth checking if a photo background or a cache has grown since install.
Does deleting a keyboard app free up all the space it used?
Yes. A keyboard extension’s storage lives inside its containing app’s sandbox, so removing the app removes the extension and everything it stored — themes, saved snippets, a background photo — with nothing left behind to clean up separately.
Try it on your own keyboard
Kibo is a free custom keyboard for iPhone with real mechanical key sounds, a wardrobe of themes and RGB backlight effects. No account, no ads, and it works with Full Access left off.