DB LabsQuick Answer
For pure value per gigabyte on iPhone, Amazon Photos wins if you already pay for Prime, since full-resolution photos are unlimited. Among paid tiers, iCloud+ and Google One both sit around $2.99 for 200 GB, and iCloud integrates far more deeply with iOS. Dropbox and OneDrive cost more per gigabyte but suit people who want files rather than a photo library.
Cost Per Gigabyte at the Tier Most People Need
Roughly 200 GB is the tier that fits a typical iPhone photo library with room to grow. Prices shift, so treat these as the shape of the market rather than exact figures.
- iCloud+ — about $0.99 for 50 GB, $2.99 for 200 GB, $9.99 for 2 TB. Family Sharing included from 200 GB up.
- Google One — about $1.99 for 100 GB, $2.99 for 200 GB, $9.99 for 2 TB. Shared with Gmail and Drive.
- Amazon Photos — unlimited photos with Prime, plus a small video allowance.
- Microsoft OneDrive — best value bundled with Microsoft 365, which includes around 1 TB alongside the Office apps.
- Dropbox — roughly $11.99 for 2 TB. The most expensive per gigabyte, with the best file-sync engine.
The headline rates are close enough that integration and quota-sharing matter more than price. A Google account already full of Gmail gives you less usable photo space than the number suggests.
Integration Is the Real Differentiator
Only iCloud can do certain things on iOS, and no amount of price advantage changes that.
- Optimize iPhone Storage — the setting that keeps thumbnails locally and originals in the cloud, transparently, throughout the Photos app. Exclusive to iCloud.
- Device backup — app data, Health, and settings. Exclusive to iCloud.
- Messages, Notes, Keychain sync — exclusive to iCloud.
- Background upload reliability — iOS gives its own services background time that third-party apps do not get, which is why Google Photos uploads stall when the app is closed.
Third-party services store copies. iCloud is part of how the phone works. That distinction is worth more than a dollar a month to most people.
Where Each One Is Actually the Right Answer
- iCloud+ — you are all-Apple and want storage to be invisible. The default, and correct for most.
- Google Photos — you also use Android or Windows, or you want the best search and face grouping available.
- Amazon Photos — you have Prime and a photo-heavy, video-light library. Hard to beat on price.
- OneDrive — you already pay for Microsoft 365, making the terabyte effectively free.
- Dropbox — you work with files across machines and want reliable sync more than a photo experience.
These are not mutually exclusive. Running iCloud at 50 GB for backup alongside Amazon Photos for the library is a common and sensible combination.
The Trap: Cloud Storage Does Not Free Your iPhone
The most common misunderstanding in this whole category. Uploading photos to Google Photos, Dropbox, or Amazon does not remove them from your device. You now have two copies and the same amount of local space used.
Only Optimize iPhone Storage with iCloud Photos does this automatically. Every other service requires you to delete local originals yourself after verifying the upload finished.
Sync Is Not Backup
Worth stating plainly. A synced service propagates deletions. Delete a photo on your iPhone with iCloud Photos or Google Photos enabled and it disappears from the cloud too, usually within seconds.
That protects you against a lost or broken phone. It does not protect you against deleting something by mistake, ransomware, or an account lockout. A real backup is a separate copy that does not change when the original does — an external drive, or a second service that is not syncing.
Our redundancy guide covers this properly, and Swype Photo Cleaner helps make sure you are not paying to store thousands of photos you never wanted.
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