NordVPN sells reassurance: six audits, a jurisdiction outside every intelligence-sharing agreement, and a feature list long enough that nothing is obviously missing. Proton VPN sells a different thing, which is that you can find out whether you like it before any money changes hands.
What you can use without paying anything
Proton VPN's free plan has no data limit and no expiry date, and it does not ask for a card. That is unusual enough to be the main reason to look at it: most free VPN tiers are trials wearing a different word, and this one is not. You get one device and ten countries, which is a real constraint rather than a hidden one.
NordVPN has no free tier. The advertised rate covers twenty-seven months and then renews at more than three times what you agreed to, so the cheap number you see is a number you pay once.
Apps you can read against apps you cannot
Proton VPN's clients are open source, so the claim that the software does what it says can be checked by somebody other than the company making it. Proton also offers port forwarding, which matters if you seed or self-host anything, and has been inspected by outside auditors five years running.
NordVPN's apps are closed, and it has no port forwarding at all. What it has instead is reach: obfuscation for networks that block VPNs, a route into Tor without a separate browser, multi-hop and a SOCKS5 proxy. Proton has obfuscation and multi-hop but neither of the other two.
The one place NordVPN clearly leads is responsiveness. Proton VPN is the slowest here to start loading a page, and on video calls that shows.
Which should you choose?
Choose Proton VPN if you want to try a VPN properly before paying for one, if you want clients somebody outside the company can audit, or if port forwarding is on your list. Choose NordVPN if you need to reach Tor or get through a network that actively blocks VPN traffic, and you are willing to pay a renewal price that is triple the joining price.
If the slow first load is what worries you about Proton and the renewal is what worries you about NordVPN, Mullvad avoids both and costs five euros a month at any term.

NordVPN
Checked by auditors six times, and priced to renew at triple.

Proton VPN
A free tier with no data cap, no expiry and no card required.
Specs
Ratings
Speed
Privacy
Ease of use
Value
Features
Pricing
NordVPN
Proton VPN
Related comparisons
More head-to-head matchups
Explore other comparisons involving NordVPN or Proton VPN.
Comparison


NordVPN vs ExpressVPN
Both cost about the same and both renew at roughly triple. What separates them is how much of each no-logs claim an outside firm has checked.
Comparison


ExpressVPN vs Proton VPN
ExpressVPN is the quicker connection by a clear margin. Proton VPN is the one whose apps you can read and whose free tier never expires.
Comparison


NordVPN vs CyberGhost
CyberGhost is cheaper and has more streaming servers. NordVPN can hide that you are using a VPN at all, and says who owns it.
Comparison


Proton VPN vs CyberGhost
Proton VPN has been inspected five years running and its apps are open. CyberGhost has streaming servers and a parent company it does not name.
Comparison


NordVPN vs PureVPN
PureVPN is cheaper on a long prepayment and gave a customer's connection records to the FBI in 2017. NordVPN has been audited six times since.
Comparison


Proton VPN vs Private Internet Access
Both publish their source. One is Swiss with a free tier you can stay on; the other is American, cheaper over three years, and owned by Kape.