YouLMK vs changedetection.io

YouLMK or changedetection.io?

changedetection.io, in its own words: "Website Change Detection... For clever people": the "best and simplest tool for website change detection, web page monitoring, and website change alerts", open source under Apache 2.0 (33,825 stars on GitHub on 12 September 2026), with an official hosted service at $8.99 a month for up to 5,000 URLs, re-checked from about 5 minutes, notifying through more than 85 services via Apprise. YouLMK is an inbox you let things interrupt you through: anything with an HTTP client sends into it, and you decide per sender how far a message may reach, whether quiet hours hold it and how repeats group. It can also watch a page, an endpoint, a status page, a feed, a number or a time, and send when the answer changes.

Every fact about changedetection.io below was read on its own pages on 12 September 2026. If one has changed since, write to hello@youlmk.com and it is corrected the same day.

Side by side

changedetection.io

YouLMK

What it is

A page-change monitor: you add URLs, filters and triggers; it diffs them on a schedule and sends through a notification service.

A hosted inbox that also watches: a sentence becomes a watch on a page, an endpoint, a status page, a feed, a number or a time.

Price

Self-host for free; the hosted service is $8.99 a month for up to 5,000 URLs.

Watch $12 a month or $120 a year for 100 watches at 5-minute checks and 100,000 checks a month, Send included; Send alone $4. Trial: 3 watches and 10 notifications, no card.

Open source

Yes, Apache 2.0.

No.

How a watch is made

A URL, then filters, selectors and triggers in the interface.

A sentence, read back as target, condition, interval and delivery before it runs; or a guided path of three questions; on the phone, a tap on the part of the page to watch.

What it can watch

Web pages, with a browser for pages that need one; text, visual selectors, prices with a built-in price scraper, and more.

Pages (text appears or disappears, a region changes, any change), endpoints (status, body, a JSON field), vendor status pages, feeds and GitHub releases, a number crossing a line, a schedule.

Where the notification lands

Wherever Apprise can send: Slack, email, Discord, Telegram, push services, and more; YouLMK too once its Apprise plugin is merged.

Its own inbox on iPhone, Android and the web, with email, Slack and a signed webhook as destinations.

Rules on the receiving side

The notification service's own.

Per watch: a Reach level, whether quiet hours hold it, which destinations; a fired watch carries before and after.

Scale

Up to 5,000 URLs on the hosted plan.

100 watches on the plan.

Choose changedetection.io if

You watch hundreds or thousands of pages, or need filters, selectors and diffs tuned by hand.
You want to self-host, or you already have Apprise wired to where you want to be told.
The notification is a means; the diffs and the history are the product you want.

Choose YouLMK if

You want to type what you want to know and be told when it changes, on your phone, without a dashboard.
The watch is one of many things that send to you and you want one inbox with rules for all of them.
You also watch endpoints, status pages, feeds, numbers and times, not only pages.

What is the same

Both check pages on a schedule and tell you when something changed, both render pages that need a browser, and both send to Slack and email. changedetection.io is a monitor with a notifier behind it; YouLMK is an inbox with a watcher inside it.

Try it

The trial is 10 notifications and 3 watches, no card, no clock. Get your key, or read the docs first.

Sources

changedetection.io, the front page with the hosted plan, read 12 September 2026
github.com/dgtlmoon/changedetection.io, read 12 September 2026