1
WebAuthn
webauthn.guideAlso covers security and security tools · same kind of website
This WebAuthn guide explains an authentication API intended to replace passwords with stronger authentication.
Alternatives
The Best SSLMate CAA Alternatives in 2026
24 alternatives1 free · 2 open source
Looking for something like SSLMate CAA? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan and 2 are open source.
About SSLMate CAAsslmate.com/caa
VisitSSLMate CAA helps generate CAA DNS records and explains which certificate authorities support the record type.
Top picks at a glance
First suggestionWebAuthnThis WebAuthn guide explains an authentication API intended…Free or freemium optionOTP AuthManage two-factor authentication codes with OTP Auth, an…Open source optionacme.shacme.sh automates SSL and TLS certificate management using…Another optionMozilla SSLGenerate secure SSL configurations for selected web…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | WebAuthn | — | Not stated | Web |
| 2 | Mozilla SSL | — | Not stated | Web |
| 3 | ZeroSSL | — | Not stated | Web |
| 4 | Certbot | — | Not stated | Linux, macOS, Web |
| 5 | 2FAuth | — | Not stated | Web |
| 6 | Authenticator | — | Not stated | Web |
| 7 | WhatsMyDNS | — | Not stated | Web |
| 8 | mess with dns | — | Not stated | Web |
| 9 | DNS Watch | Paid | Not stated | Web |
| 10 | DNSDumpster | — | Not stated | Web |
All SSLMate CAA alternatives
2
Also covers security and security tools · same kind of website
Generate secure SSL configurations for selected web, database, and mail software.
3
ZeroSSL
zerossl.comAlso covers security and security tools · same kind of website
ZeroSSL issues online SSL certificates and supports HTTPS setup through a certificate management interface.
4
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.
5
2FAuth
docs.2fauth.appAlso covers security and security tools · same kind of website
Store, generate, and organize one-time password codes with 2FAuth, a self-hosted manager for individuals and teams.
6
Authenticator
authenticator.ccAlso covers security and security tools · same kind of website
Generate two-factor authentication codes in Chrome, Firefox, or Edge with the Authenticator extension.
7
WhatsMyDNS
whatsmydns.netAlso covers security and security tools · same kind of website
WhatsMyDNS checks DNS record propagation across global resolvers for record types including A, AAAA, MX, and TXT.
8
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.
9
Also covers security and security tools · same kind of website
DNS Watch looks up DNS records and measures lookup performance across resolvers.
10
DNSDumpster
dnsdumpster.comAlso covers security and security tools · same kind of website
DNSDumpster searches domain records and related hosts for domain research and reconnaissance.
11
Also covers security and security tools · open source
acme.sh automates SSL and TLS certificate management using a Unix shell script ACME client.
12
UUID Generator
toolkitvault.com/uuid-generatorAlso covers security and security tools
This online generator creates UUIDs in versions 1, 3, 4, 5, 6, and 7 for use in applications and data records.
13
Also covers security and security tools · open source
Experiment with DNS records and behavior using the interactive Mess With DNS project.
14
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.
15
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.
16
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.
17
NVD
nvd.nist.govAlso covers security and security tools · same kind of website
Search the National Vulnerability Database, a public resource for vulnerability information.
18
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.
19
mCaptcha
mcaptcha.orgAlso covers security and security tools · same kind of website
Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.
20
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.
21
Synk
security.snyk.ioAlso covers security and security tools · same kind of website
The Snyk Security Database provides vulnerability details and remediation guidance for packages and cloud configurations.
22
URL Decoder/Encoder
meyerweb.com/eric/tools/dencoderAlso covers security and security tools · same kind of website
The URL Decoder and Encoder converts text between encoded and decoded forms, including JavaScript URLs.
23
Lucia
lucia-auth.comAlso covers security and security tools · same kind of website
Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.
24
DNSPerf
dnsperf.com/dns-providers-listAlso covers security and security tools · same kind of website
DNSPerf compares the performance and uptime of enterprise and commercial DNS providers.
No alternatives match this filter.
Alternatives to similar tools
OTP Auth24 alternativesMozilla SSL24 alternativesNVD24 alternativeschallenges.re24 alternativesWhatsMyDNS24 alternativesGoPlus Locker V324 alternatives
TopicSecurity Tools · 202 sites Best-of list8 Best Free Authenticator Apps for Codes and Recovery ListingSSLMate CAA details
What is the best alternative to SSLMate CAA?
Based on features, tags and platforms, the closest alternatives to SSLMate CAA are WebAuthn, Mozilla SSL, and ZeroSSL.
Is there a free alternative to SSLMate CAA?
Yes. OTP Auth is free or offer a free plan.
Are there open-source alternatives to SSLMate CAA?
Yes: acme.sh and Mess With DNS.
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