Guides
Uptime monitoring vs change monitoring: who sets the threshold
Uptime monitoring asks a question a machine can answer alone. Change monitoring asks one only you can. The split is ownership, thresholds and what's in the alert.
Last Modified
Product updates, monitoring guides, and how modsignal decides what counts as a change.
Guides
Moving your monitors off Visualping: what to re-check before you switch anything on
A migration checklist for anyone shopping for a Visualping alternative. Which pages to move first, what to rewrite instead of copy, and the four settings that quietly decide whether your new monitors stay quiet.
Guides
The page has no RSS feed. Make one out of what changes on it.
No feed on the page? Find the hidden one first. If there really isn't one, stop trying to extract items. Turn each real change into a feed entry, with evidence attached.
Guides
Back in stock alerts for any website, including the stores that won't waitlist you
The store's "notify me" email is a marketing flow with a throttle, and some pages have no button at all. How to build a restock alert that reads the product page itself, on any store.
Guides
How to monitor regulatory changes on government websites (and why exact diff beats the AI tier)
Regulatory registers change by a word, not a redesign. Why byte-for-byte exact diff is the right check tier for government pages, where it breaks, and the five-step setup, plus the honest cases for the AI tier and for buying a GRC platform instead.
Guides
Visualping vs Distill.io vs changedetection.io: three tools, three definitions of "changed"
Three tools, three definitions of changed: pixels, selectors, text diffs. How each one decides, what it costs, and where each fails. Pricing checked August 2026.
Guides
What you actually get on a free website change monitoring plan (2026, all the numbers)
Every free website change monitoring plan in 2026, with the arithmetic the pricing pages skip: checks per monitor, hidden alert caps, locked channels, and when free is genuinely enough.
Guides
Get told the day the role is posted: monitoring careers pages without checking them
Boards, aggregators and Google Alerts are all downstream of a page you can watch directly. How to get one alert when a company posts a job you'd actually apply to, with the title, before/after, and a screenshot of the board as checked.
Guides
When a competitor rewrites their homepage: monitoring positioning, not pricing
Pricing changes announce themselves in numbers. Positioning changes hide in adjectives, CTAs and a logo wall. Here's how to track competitor website changes that signal a repositioning: the prompt, the check tier, and the corroboration rule.
Guides
Deprecation notices don't email you: monitoring the changelogs your product depends on
Deprecation notices get published, not delivered. How to track API deprecation notices in vendor changelogs, deprecation tables and version policies, and catch the dates that move.
Guides
Website change alerts in Slack that nobody has to reopen the page for
Connecting Slack takes two minutes. What decides whether anyone still reads the channel in a month is what's inside the message: one sentence, a before/after, a confidence score, and a link to the full history.
Engineering
Monitoring pages that don't exist until JavaScript runs them
Some pages are an empty div until JavaScript builds them. How to tell whether you need a real browser, why rendering adds noise instead of removing it, and which check tier holds on each kind of page.
Guides
Seven reasons your page monitor cries wolf (and what to do about each one)
A/B tests, cookie banners, bot walls, dead selectors: the seven things actually firing your false positives, what's happening under each one, and the fix, including the three fixes that aren't a product.
Guides
Google Alerts doesn't watch pages. Here's what to use for the ones it misses
Google Alerts emails you new search results, not edits to a page you already know about. How to sort your alerts, which ones to move, and how to set the moved ones up so they stay quiet.
Engineering
The Python script that monitors a page for changes — and what it costs you six months in
The 40-line Python script to monitor website changes works on day one. Here's the whole thing, plus what it costs by month six: false positives, a 403, cron drift measured in hours, and about 24 hours of your time.
Guides
How to write a monitoring prompt that knows the difference between "the page changed" and "the thing I care about changed"
Most monitors alert when a page changes. Here's how to write a prompt that alerts when the thing you care about changes. Five rules, the research behind them, and worked examples you can copy.
Guides
The best website change monitoring tools in 2026
An honest comparison of nine page-monitoring tools — Visualping, Distill, changedetection.io, and more — organized by the question that actually matters: what happens when the page changes?
Engineering
Exact diff, semantic, or browser agent: choosing a check tier
modsignal's three check tiers trade cost for judgment. How each one works, what each one catches, and a simple rule for picking the right tier per page.
Guides
How to monitor your vendors' subprocessor lists (before the objection window closes)
Vendors change subprocessor lists quietly, and their notification mechanisms are opt-in at best. A practical guide to watching subprocessor pages, DPAs, and trust centers — with GDPR Article 28 mechanics explained.
Guides
How to monitor a competitor's pricing page without drowning in noise
Pricing pages change quietly and often. A practical setup for catching the changes that matter — plan drops, limit changes, trial cuts — and ignoring the rest.
Product updates
Introducing modsignal
Describe what you care about in plain language. modsignal checks the page and alerts you only when it truly changes, with evidence attached.