letsencrypt.org vs projectzero.google - Which Is Better? 2026 In-Depth Comparison

💡 letsencrypt.org vs projectzero.google: which should you choose?

• Note: letsencrypt.org is in "Security" while projectzero.google is in "pentest" — they serve different purposes, so choose by use case rather than treating them as direct competitors.
• On overall rating letsencrypt.org scores higher (9.9 vs 9.0), so if reputation and all-round experience matter most, letsencrypt.org is the safer bet.
• On mainland China accessibility projectzero.google is better, so if your users are mostly in China, projectzero.google is the easier choice.

The guidance above is auto-compiled by TG4G from public data and is not purchase advice. Always rely on the official site and your own testing. A green cell marks the better value on that dimension (higher rating / CN / refund, or lower price). Some links are affiliate links (rel="sponsored nofollow").

Which should you pick?

If you want all-round balance and reputation, choose letsencrypt.org; if your core need happens to be projectzero.google's strength (Better mainland China accessibility), then projectzero.google is the better fit. Either way, trial the cheapest plan for a week before committing long-term.

This page is a side-by-side reference, not purchase advice; prices and policies are per the official sites, and some links are affiliate.

🔎 Want more options? Alternatives to both