How we rank: Cloud Storage
The Score (0–100) is a weighted sum of the factors below. Each factor is the weighted average of its metrics; each metric is calculated from one published fact. Missing facts score zero, and a service is ranked only when enough of its Score is backed by facts.
A service is ranked only when at least 70% of its Score is backed by verified facts.
Privacy & Security 35%
Whether a regular user can turn on end-to-end (zero-knowledge, client-side) encryption for ordinary files — built in or as a separate encrypted folder (weight 3), whether an independent security audit or penetration test of the service is published (weight 2), whether sign-in can be protected with a FIDO2/U2F hardware key (weight 1), and whether you can choose the data-center region or country for your files (weight 1). Encryption offered only on business plans does not count for personal users.
| Metric | Rule |
|---|---|
| End-to-end encryption of files | Yes = 100, No = 0 |
| Independent security audit | Yes = 100, No = 0 |
| Hardware key sign-in (FIDO2/YubiKey) | Yes = 100, No = 0 |
| Choice of data storage region | Yes = 100, No = 0 |
Price 30%
How many gigabytes the permanent free plan gives without referral bonuses (logarithmic, 20 GB or more scores full; weight 1) and the monthly price of one terabyte on the cheapest personal plan of 1 TB or more, in US dollars as the company shows it (usually billed yearly; regular price, not a first-term discount; lifetime plans are not counted): $0 scores 100, $15 or more scores 0 (weight 2). We never convert currencies: if the company shows no US-dollar price, the fact stays empty.
| Metric | Rule |
|---|---|
| Free storage, GB | Logarithmic, full score at 20 |
| Price per TB per month (cheapest plan of 1 TB+) | Linear from 0 (100) to 15 (0) — lower is better |
Features 15%
How many of six platforms have official apps: Windows, macOS, Linux, iOS, Android, web (logarithmic, full score at 6; weight 2). How many days of file version history are kept on the same plan we use for the price (365 days or "no limit" scores full), and whether shared links can be protected with a password and given an expiry date.
| Metric | Rule |
|---|---|
| Platforms with apps (of 6) | Logarithmic, full score at 6 |
| File version history, days | Unlimited = 100; linear from 0 to 365 |
| Password-protected links | Yes = 100, No = 0 |
| Expiring links | Yes = 100, No = 0 |
Reputation 10%
Average App Store (US) rating of the app, weighted by the number of ratings (from the official iTunes Lookup API). A service without its own App Store app has no data for this factor.
| Metric | Rule |
|---|---|
| App Store rating | 3★ = 0, 5★ = 100, damped below 1,000,000 ratings |
Transparency 10%
The company's age (15+ years scores full) and whether it publishes a transparency report on how many government requests for user data it received and complied with.
| Metric | Rule |
|---|---|
| Founded | Full score at 15+ years |
| Transparency report | Yes = 100, No = 0 |