1
Certbot
certbot.eff.orgAlso covers security and security tools · same kind of website
Obtain a certificate for a website with Certbot, which helps configure HTTPS.
Alternatives
The Best ZeroSSL Alternatives in 2026
24 alternatives3 free · 6 open source
Looking for something like ZeroSSL? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 3 are free or have a free plan and 6 are open source.
ZeroSSL issues online SSL certificates and supports HTTPS setup through a certificate management interface.
Top picks at a glance
First suggestionCertbotObtain a certificate for a website with Certbot, which…Free or freemium optionSSL for FreeSSL for Free provides SSL and wildcard certificates for…Open source optionacme.shacme.sh automates SSL and TLS certificate management using…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Certbot | — | Not stated | Linux, macOS, Web |
| 2 | SSL for Free | Free | Not stated | Web |
| 3 | acme.sh | — | Yes | — |
| 4 | Key Manager | — | Yes | — |
| 5 | mess with dns | — | Not stated | Web |
| 6 | HTML editor | — | Not stated | Web |
| 7 | Metasploit | — | Not stated | Web |
| 8 | SSLMate CAA | — | Not stated | Web |
| 9 | Observatory | — | Not stated | Web |
| 10 | Anubis | — | Not stated | Web |
All ZeroSSL alternatives
2
Also covers security and security tools · same kind of website · free
SSL for Free provides SSL and wildcard certificates for enabling HTTPS on websites.
3
Also covers security and security tools · open source
acme.sh automates SSL and TLS certificate management using a Unix shell script ACME client.
4
Also covers security and security tools · open source
Manage GnuPG keys from a terminal with gpg-tui, a text-based key management interface.
5
mess with dns
messwithdns.netAlso covers security and security tools · same kind of website
mess with dns provides an interface for viewing and editing DNS records.
6
HTML editor
onlinehtmleditor.devAlso covers security and security tools · same kind of website
This HTML editor supports writing and converting HTML, including Word-to-HTML conversion in a browser interface.
7
Metasploit
metasploit.comAlso covers security and security tools · same kind of website
Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.
8
SSLMate CAA
sslmate.com/caaAlso covers security and security tools · same kind of website
SSLMate CAA helps generate CAA DNS records and explains which certificate authorities support the record type.
9
Observatory
developer.mozilla.org/en-US/observatoryAlso covers security and security tools · same kind of website
Test HTTP security headers such as CSP and HSTS, then review recommendations for improving a site.
10
Anubis
anubis.techaro.lolAlso covers security and security tools · same kind of website
Protect a website from automated bot requests with Anubis, which evaluates incoming HTTP requests.
11
Also covers security and security tools · open source
Security and best-practice issues in container images can be checked with Dockle.
12
Also covers security and security tools · open source
Agentic Radar scans agent workflows for security issues and helps developers review potential risks.
13
Also covers security and security tools · same kind of website · free plan
Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.
14
DNS over HTTPS
github.com/curl/curl/wiki/DNS-over-HTTPSAlso covers security and security tools
Configure DNS over HTTPS in curl, the command-line transfer tool and library.
15
Also covers security and security tools · open source
Configure DNS over HTTPS on iOS and macOS using the provided configuration profiles.
16
Also covers security and security tools · same kind of website
Generate secure SSL configurations for selected web, database, and mail software.
17
Also covers security and security tools · open source
Anubis weighs incoming HTTP requests to help block AI crawlers before they access a website.
18
Webkay
webkay.robinlinus.comAlso covers api, security, and security tools · same kind of website
See what information a website can access from your browser with Webkay, a browser data demonstration.
19
URLhaus
urlhaus.abuse.chAlso covers api, security, and security tools · same kind of website
URLhaus shares URLs identified as being used to distribute malware and supports tracking those reported links.
20
Also covers api, security, and security tools · same kind of website · free
CheckFileType identifies unknown files without extensions by analyzing their contents.
21
challenges.re
challenges.reAlso covers security and security tools · same kind of website
Solve reverse engineering challenges published on challenges.re, a challenge-focused site.
22
GoPlus Locker V3
gopluslabs.ioAlso covers security and security tools · same kind of website
GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.
23
NVD
nvd.nist.govAlso covers security and security tools · same kind of website
Search the National Vulnerability Database, a public resource for vulnerability information.
24
tpscalls.live
tpscalls.liveAlso covers security and security tools · same kind of website
View Toronto Police calls for service on a map that updates in real time, according to the supplied page description.
No alternatives match this filter.
Alternatives to similar tools
OTP Auth24 alternativesMozilla SSL24 alternativesNVD24 alternativeschallenges.re24 alternativesGoPlus Locker V324 alternativesiOS + macOS Configs24 alternatives
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What is the best alternative to ZeroSSL?
Based on features, tags and platforms, the closest alternatives to ZeroSSL are Certbot, SSL for Free, and acme.sh.
Is there a free alternative to ZeroSSL?
Yes. SSL for Free, OTP Auth, and CheckFileType are free or offer a free plan.
Are there open-source alternatives to ZeroSSL?
Yes: acme.sh, Key Manager, Dockle, and Agentic Radar.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative