Password managers differ most in where the vault lives, whether the code is open to inspection and what the free plan allows. This ranking weighs vault design and storage first, then platform reach, free-plan limits and price.
VPN services differ most in who runs the servers, whether the apps are open to inspection and whether a free plan exists. This ranking weighs company base and transparency first, then open-source apps, free-plan access, platform coverage and price.
Authenticator apps differ in backups, open-source code and platform reach. This ranking weighs how codes are stored and backed up first, then open-source status, platform coverage and whether an account is needed.
Secure email providers differ most in how they encrypt mail, where their servers sit and whether a free plan exists. This ranking weighs encryption design and hosting first, then free-plan access, platform reach and price.
File encryption tools differ in what they protect, from whole disks to single files and archives, and in how much setup they need. This ranking weighs encryption design and openness first, then the kind of data each tool protects, platform reach and price.
Antivirus software ranges from built-in protection to paid suites and open-source engines. This ranking weighs what each product covers first, then free-version access, platform reach and the extra tools bundled with it.