attestd vs Certly: Which is Better in 2026?
A comprehensive comparison of attestd and Certly covering features, pricing, use cases, and which tool is the right choice for your needs.
⚡ Quick Verdict
Choose attestd if:
- →You need a broader feature set (6 features vs 5)
- →You need risk_state: nvd-derived vulnerability classification (none → critical) or supply_chain.compromised: malicious-publish flag independent of cve history
Choose Certly if:
- →You want more affordable paid plans (from $10/mo)
- →You need grades the certificate chain your server actually serves, not your renewal config or staged 30/14/7/1-day expiry warnings to email, slack, discord or webhook
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attestd vs Certly: At a Glance
Pricing Comparison: attestd vs Certly
Understanding the pricing differences between attestd and Certly is crucial for making the right choice. Here's how their plans compare side by side.
💡 Pricing takeaway: Both attestd and Certly offer free tiers, making it easy to try before you buy. Compare the specific plans to find the best value for your use case.
Feature-by-Feature Comparison
Here's how every feature from attestd and Certly stacks up.
What Makes Each Tool Unique
🔵 Unique to attestd
Features available in attestd but not in Certly:
- ✓risk_state: NVD-derived vulnerability classification (none → critical)
- ✓supply_chain.compromised: malicious-publish flag independent of CVE history
- ✓typosquat: package-name integrity including AI-hallucinated package names
- ✓No code or repository access required
- ✓Python SDK and a documented curl quickstart
- ✓Free tier at 1,000 calls/month with the full response schema
🟣 Unique to Certly
Features available in Certly but not in attestd:
- ✓Grades the certificate chain your server actually serves, not your renewal config
- ✓Staged 30/14/7/1-day expiry warnings to email, Slack, Discord or webhook
- ✓Domain expiry plus registry-status and NXDOMAIN suspension diagnosis
- ✓DNS and DNSSEC activity monitoring with per-record muting
- ✓DMARC and SPF email-spoofing checks on every paid plan
Use Case Recommendations
Best for: attestd
attestd is a software-risk API designed to be called by CI/CD pipelines and by AI coding agents, which is a narrower and more interesting brief than a general vulnerability scanner. One request against a package name and version returns three signals that the company insists are independent by design: risk_state, an NVD-derived vulnerability classification with values from none through critical; supply_chain.compromised, a malicious-publish flag that is deliberately not derived from CVE history, so a package can return no known vulnerabilities and still be flagged as compromised; and typosquat, a package-name integrity check that catches both classic typosquats and names an LLM invented that never existed. That third signal is the one built specifically for the agent era — a coding agent that hallucinates a dependency name will happily install whatever squatter registered it, and a scanner that only scores known-good packages misses the failure mode entirely. The design principle stated throughout is determinism: NVD, CISA KEV and OSV all publish machine-readable data, but none of them yield a single condition a pipeline can branch on without interpretation, so attestd does the normalisation and returns something a script can act on. No repository or code access is required, there is a Python SDK, and the free tier is genuinely usable for evaluation and personal automation.
Ideal use cases:
- •Teams or individuals who need risk_state: nvd-derived vulnerability classification (none → critical)
- •Teams or individuals who need supply_chain.compromised: malicious-publish flag independent of cve history
- •Teams or individuals who need typosquat: package-name integrity including ai-hallucinated package names
- •Teams or individuals who need no code or repository access required
- •Anyone focused on security workflows
- •Anyone focused on api workflows
Best for: Certly
Certly watches the certificate and domain layer that almost every team assumes is on autopilot until the morning a renewal silently fails and customers hit a browser interstitial instead of a checkout page. The premise is that automated renewal is not the same as verified renewal: a cron can succeed while the server keeps serving the old chain, an ACME client can renew a cert nobody reloaded, a registrar auto-renew can bounce on an expired card. Certly does not read your renewal config — it fetches what your host actually serves and grades that, which is the only signal that matches what a visitor experiences. A monitored domain covers four surfaces: TLS certificate expiry on the served chain, domain registration expiry and registry status including NXDOMAIN and suspension diagnosis, DNS and DNSSEC record activity, and email-authentication posture through DMARC and SPF spoofing checks. Alerts are staged at 30, 14, 7 and one day rather than fired once, and they route to email, Slack, Discord or a webhook, with per-record muting so a noisy DNS zone does not train the team to ignore the channel. Onboarding is a paste of the domain — no agent to install, no nameserver change, no DNS delegation — and there is a signed-out instant check plus a live demo before any account exists. Agencies get client grouping and a year of history on the top tier, which is the shape of the buyer this is really built for: someone holding a hundred and fifty domains they did not personally register.
Ideal use cases:
- •Teams or individuals who need grades the certificate chain your server actually serves, not your renewal config
- •Teams or individuals who need staged 30/14/7/1-day expiry warnings to email, slack, discord or webhook
- •Teams or individuals who need domain expiry plus registry-status and nxdomain suspension diagnosis
- •Teams or individuals who need dns and dnssec activity monitoring with per-record muting
- •Anyone focused on ssl-monitoring workflows
- •Anyone focused on dns workflows
🔐 Other Security & Privacy Tools to Consider
attestd and Certly aren't the only options. Here are other popular tools in the same space:
Darktrace
AI cybersecurity with autonomous response
CrowdStrike Falcon
AI endpoint security and threat intelligence
Snyk
Developer security with AI vulnerability detection
GitGuardian
Automated secrets detection in code
Wiz
Cloud security with AI risk prioritization
ZeroDrift
Compliance firewall that validates, rewrites or blocks every AI output before it reaches anyone
Is one of these your tool?
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Frequently Asked Questions
Is attestd better than Certly?
It depends on your needs. attestd offers 6 key features including risk_state: NVD-derived vulnerability classification (none → critical) and supply_chain.compromised: malicious-publish flag independent of CVE history, while Certly provides 5 features including Grades the certificate chain your server actually serves, not your renewal config and Staged 30/14/7/1-day expiry warnings to email, Slack, Discord or webhook. attestd uses a freemium model with a free tier, while Certly is freemium with free access available. Choose based on which features and pricing model align with your requirements.
Is attestd cheaper than Certly?
Certly is cheaper, starting at $10/month compared to attestd's $19.99/month. Both tools offer free tiers, so you can try each before committing. Always check the official websites for the most current pricing.
Can I use attestd and Certly together?
Yes, many users combine attestd and Certly in their workflow. attestd excels at risk_state: nvd-derived vulnerability classification (none → critical), while Certly shines with grades the certificate chain your server actually serves, not your renewal config. Using both allows you to leverage the strengths of each tool, though this means managing two subscriptions — though free tiers can help manage costs.
What's the main difference between attestd and Certly?
While both are security & privacy tools, attestd emphasizes risk_state: nvd-derived vulnerability classification (none → critical), whereas Certly is known for grades the certificate chain your server actually serves, not your renewal config. The best choice depends on your specific workflow and feature priorities.
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