patchletter vs. stack.watch
stack.watch is a free service that watches vulnerabilities for the products in your stack and sends them as an email summary — hourly to monthly, plus RSS and Slack.
patchletter takes a different angle: a free update radar for sysadmins that combines vendor release tracking, actively exploited vulnerabilities (CISA KEV) and end-of-life dates — delivered as one quiet email digest instead of a real-time firehose.
Side by side
| Feature | patchletter | stack.watch |
|---|---|---|
| Release tracking for vendor products (Proxmox, FortiOS, Veeam …) | ✓ curated vendor sources: APIs, feeds, release-notes pages | ✗ |
| Actively exploited vulnerabilities (CISA KEV) | ✓ curated & low-noise — only demonstrably exploited CVEs | partly general CVE feed, no dedicated KEV curation |
| End-of-life / support dates | ✓ endoflife.date data on every product page | ✗ |
| Hardware / firmware (firewalls, NAS, switches) | ✓ | ✗ |
| Email instantly / daily / weekly | ✓ | ✓ |
| Slack / Teams / webhooks | ✗ on the roadmap — patchletter is email-first | partly Slack, RSS |
| API | partly RSS feed per product; API on the roadmap | ✗ |
| Free to use | ✓ completely free, no limits | ✓ |
When stack.watch is the better choice
- Very simple to start: pick products, get a weekly CVE email — no account frills.
- Covers the full CVE spectrum (NVD), not just actively exploited vulnerabilities.
Nothing wrong with running both: stack.watch for its strengths, patchletter for the vendor gear it can’t see.
Try patchletter — free
Pick the tools you run, confirm your email, get one email when something ships.
Browse the catalogFacts about stack.watch verified: 2026-08. Spotted something outdated? Let us know via the legal-notice contact. All product names are trademarks of their respective owners.