About Stackdiff

Stackdiff is a free weekly brief of what changed in the DevOps and infrastructure tools you run. You pick from 186 tools; every Monday you get their releases, breaking changes, security advisories, end-of-life dates and license changes, two sentences each, with a link to the vendor's own page.

Who makes it

One person: Ilya Subach. Stackdiff is a personal side project, unrelated to any employer, and it is built to be run by one person: no team, no funding, no roadmap slides. It started with a simple question: why does finding out what changed in twenty tools take twenty tabs? Reach the maintainer at hello@stackdiff.dev.

How it reads

• Only what vendors publish for machines: GitHub release feeds, vendor changelogs and blogs, the HashiCorp Releases API, OSV and vendor security advisories, endoflife.date support windows, and Hacker News for what people are actually arguing about. 505 feeds and APIs, read every hour with conditional requests and an identifying user agent. No page scraping.
• Each change is read once, for everyone, by a language model (Claude) into a fixed shape: type, severity, breaking or not, version, a two-sentence summary, a one-line action, a link. The model cannot invent a version or a CVE that is not in the source text. When the model is unavailable a keyword heuristic assigns the type and only the headline is shown.
• Excerpts are capped at 4,000 characters, full bodies are never stored or shown, and release notes are never republished. Every line links to the vendor.

How it is delivered

Email or a Slack channel, Monday morning in your time zone; daily if you switch it on. Breaking changes, CVEs, end-of-life and license changes that match your stack go out as instant alerts the moment they are seen. Weekly is the default because a daily everything-email gets unsubscribed.

What it costs

Nothing for individuals. The whole thing runs on one small server in Milan (AWS eu-south-1) for about $15 a month, so it is free while it is small and it stays free for individuals. No tiers, no trial, no card. If it saves you one bad upgrade, buy the next month of server time.

What it is not

It is not a dependency bot. Renovate and Dependabot open pull requests for the packages in a repository; Stackdiff tells you that a managed service changed its pricing, a runner image is retiring, or a keynote announced the thing you were about to build. It is for the stack, not the lockfile. It is also not a news site: two sentences and a link, then you go read the source.

Privacy, briefly

Your email, your vendor list, your delivery settings, an encrypted Slack webhook if you add one. No analytics scripts, no trackers, no third-party requests from the pages; page views are counted as daily totals on the server without cookies or IP addresses. The privacy page has the whole list.

Last updated September 13, 2026. See the changelog for what changed in Stackdiff itself, or browse the tools it watches.