Sentinel checks the pages you care about on a schedule, ignores cosmetic churn, and sends one plain-English sentence for every change that matters — by email digest, Slack, or API.
Competitor raised Pro pricing by 34%.
Changes are batched into a daily or weekly digest — a short list of sentences you can read in under a minute. Anything urgent can also go straight to Slack, Discord, or Teams the moment it's confirmed.
Every summary links to the exact before-and-after diff, so you can verify it yourself in one click.
No selectors to map and no rules to write. Add a page, pick a schedule, and Sentinel handles the rest — here's a typical day for one monitored URL.
Regulators edit guidance pages without announcements. Sentinel keeps a timestamped record of every change it finds — useful evidence when an auditor asks exactly when you knew.
Watches: regulator rulebooks, guidance pages, government notices, published PDFs.
An accidental noindex, a rewritten title tag, or a template change can sit unnoticed for weeks. Watch a whole client portfolio and hear about it the day it happens.
Watches: client pages, robots.txt, sitemaps, competitor pricing and changelogs.
Supplier terms shift quietly between renewals — a liability cap halves, an SLA weakens, a data-residency clause moves jurisdiction. Know the day it changes, not at signature time.
Watches: supplier T&Cs, SLA pages, data-processing agreements.
The whole feature list fits on one sheet. Every item below is included on every plan, the free one included.
AI summaries, noise filtering, digests, webhooks, and API access come with every plan. There are no feature gates to decode.
For the handful of pages you already re-check by hand. No card, no expiry.
Start freeA full competitive set, a regulator watchlist, or a client portfolio.
Start trialChange monitoring is an established category and the incumbents are genuinely good tools — Visualping alone serves over two million users. Here's where each is strong, and where Sentinel differs.
| Tool | Where it's strong | Where Sentinel differs |
|---|---|---|
| Visualping | Pixel-level visual diffing, a browser extension, and the most mature product in the category, with 2M+ users. | You still review screenshots and diffs yourself on most plans. Sentinel writes the plain-English sentence for you, on every plan — at a lower price per tier. |
| Distill.io | Fine-grained element targeting and local, in-browser monitoring, with a generous free tier for tinkerers. | Distill is built for power users who enjoy configuring selectors. Sentinel needs a URL and nothing else, then tells you what changed in words. |
| ChangeTower | Long-term page archiving and compliance-oriented alerting. | Alerts point to raw changes; interpreting them is your job. Sentinel keeps the timestamped archive and adds the one-sentence interpretation. |
Add a URL, get a baseline in seconds, and receive your first summary the next time something real changes.
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