When you download an app from the App Store, the size listed is just the beginning. The actual amount of storage an app uses on your iPhone grows significantly over time due to caches, user data, and downloaded media.
We measured the storage footprint of the most popular apps in 2026. Keep in mind that your numbers will vary based on how heavily you use the app, but this table provides a realistic look at what to expect.
App Size Comparison Table
| App | Download Size | Typical Usage Size (with Cache) | Offline Downloads? |
|---|---|---|---|
| TikTok | ~320 MB | 1 GB - 5 GB | Yes (Drafts & Saved) |
| ~250 MB | 1 GB - 3 GB | No | |
| ~150 MB | 2 GB - 20+ GB | Yes (Chat Media) | |
| Spotify | ~160 MB | 500 MB - 10+ GB | Yes (Music & Podcasts) |
| YouTube | ~300 MB | 1 GB - 5 GB | Yes (Premium) |
| Google Maps | ~250 MB | 500 MB - 2 GB | Yes (Offline Maps) |
Why Do Apps Grow So Large?
When you download an app, you are just installing the core code required to run it. As you use the app, it saves temporary files (cache) to make loading times faster. For example, Instagram caches images you have already seen so it does not have to redownload them if you scroll back up.
Messaging apps like WhatsApp grow because they store all the high-resolution photos and videos sent by your friends and family.
How to Reduce App Storage
- Clear Cache: Some apps (like TikTok and Telegram) have built-in options in their settings to clear the cache safely.
- Reinstall: For apps like Instagram that do not let you clear the cache, deleting the app from your iPhone and reinstalling it from the App Store will wipe the cache clean.
- Manage Downloads: Check Spotify and Netflix for old playlists or episodes you have downloaded and no longer need.
The Hidden Giant: Your Camera Roll
While third-party apps can take up a lot of space, the native Photos app is almost always the biggest storage consumer on an iPhone. If clearing app caches does not solve your storage problems, you need to clean your camera roll.
You can do this manually by scrolling and tapping, or you can use a tool like Swipe Photo Cleaner. It lets you review your photos full screen and simply swipe left to delete the bad ones, helping you reclaim gigabytes of space in just a few minutes.