Dev tools · alternatives · 2026

24 alternatives to OnlineOrNot Browser Checks

Browser-based uptime checks for your critical pages.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. OnlineOrNot Browser Checks launched in 2021; newer entries below may have overtaken it.

1
Checkbot for Chrome Beta▲229
Check the SEO, speed & security of 100s of pages in a click!
2018 · checkbot.io · its alternatives →
2
OnlineOrNot▲9
We alert you before your customers do.
2019 · onlineornot.com · its alternatives →
3
Website Checker▲110
Sends you alerts when your website goes down.
2018 · its alternatives →
4
Checkify▲77
Super minimal, simple and inexpensive 24/7 uptime monitoring
2021 · its alternatives →
5
I made tool that let's you see everything about any website▲411
Yes, it's open source: https://github.com/lissy93/web-check :) Why I'm building this? There are a lot of tools out there for discovering meta and security data relating to a website, IP or server. But currently, there isn't anything that does everything, all in one place and without a paywall/ user sign up. It's still a WIP, and I'm working on a new version, with some more comprehensive checks, so any feedback would be much appreciated :)
2024 · v1.web-check.xyz · its alternatives →
6
Checkbot for Chrome – web crawler that tests for web best practices▲83
Checkbot finds SEO, speed & security problems before your website visitors do. Tests for broken links, duplicate content, invalid HTML/CSS/JavaScript, insecure pages & more. Test 100s of pages at once including local sites to keep on top of problems & stop critical issues going live.
2018 · checkbot.io · its alternatives →
7
Uptime Monitor▲76
Get instant alerts when your website goes down.
2023 · uptime-monitor.io · its alternatives →
8
Serpstat Website SEO Checker▲191
Check your website's SEO, analyze competitors and keywords
2019 · serpstat.com · its alternatives →
9UW
Uptime.website – A free uptime check tool▲11
2024 · uptime.website · its alternatives →
10
ApiChecker▲104
Reliable uptime and performance monitoring for your services
2019 · its alternatives →
11
Reddit Check▲126
A tool to check if a URL is on Reddit and going viral
2016 · chromewebstore.google.com · its alternatives →
12
IsPage.Online▲6
Check the availability of the site every 2 minutes
2018 · its alternatives →
13
Uptime▲133
Automated Shopify store QA testing & platform status alerts
2022 · apps.shopify.com · its alternatives →
14
StatusPing▲78
Monitor everything about your website
2021 · its alternatives →
15SA
Stop asking your clients "What browser are you on?"▲93
2013 · browser-details.com · its alternatives →
16
Web-alert.io — Uptime Monitoring▲7
Instant uptime alerts. Stay online, stay confident.
Dec 2025 · web-alert.io · its alternatives →
17
On-Page SEO Checker▲81
A tool for SEO analysis of website pages and finding errors
2022 · pr-cy.io · its alternatives →
18
Checkeeper▲82
Print checks online in 10 seconds
2015 · checkeeper.com · its alternatives →
19CA
Checkup, an open-source uptime monitoring tool built for developers▲22
2016 · text.sourcegraph.com · its alternatives →
20
UptimeEye▲8
Your homepage is up. Your checkout might not be.
2025 · uptimeeye.com · its alternatives →
21
Free Website Uptime Checker▲9
Is your website available worldwide? Let’s find out!
2024 · odown.com · its alternatives →
22
I created a tool for quick website availability checks in 15 locations▲16
Check if your website is up or down from 15 global locations in seconds. Free, instant, no sign-up required. Get alerted the moment it goes down.
2024 · pulsetic.com · its alternatives →
23
DownOrNot▲6
Is a Website Down? Find Out Instantly!
2025 · downornot.net · its alternatives →
24
Sitewatch▲6
Website monitoring that catches what uptime tools miss.
Mar 2026 · getsitewatch.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →