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Intelligence View

⚡ tsecurity.de Intelligence

I Built a Free UptimeRobot Alternative That Runs Entirely in Your Browser

I Built a Free UptimeRobot Alternative That Runs Entirely in Your Browser (No Sign-Up) I wanted to check if a website was down without handing my email to yet another SaaS dashboard. So I built two free tools that run entirely in the…

Sichere Programmierung dev.to 24.04.2026, 23:52 Uhr 4 Min. Lesezeit Cloud & IT-Enterprise

↗ Quelle (dev.to)

Reagiere als Erste:r — dein Feedback zählt!

I Built a Free UptimeRobot Alternative That Runs Entirely in Your Browser (No Sign-Up)

I wanted to check if a website was down without handing my email to yet another SaaS dashboard. So I built two free tools that run entirely in the browser — zero sign-up, zero server polling, zero telemetry. Both are under a minute to try, and one of them has a status-badge generator that gives you free README backlinks for your repo.

No account. No cloud. Nothing stored on a server. Your URL never leaves your machine.

1. Is My Website Down Right Now? — Instant Checker

The problem: When a site stops loading, you need to know in 5 seconds: is it actually down, or is it just me? The popular options all have catches — IsItDownRightNow routes your query through their server (they see everything you check), UptimeRobot needs an account and a monitor setup, DownDetector only works for the 100 biggest sites.

The tool: Type any URL and the tool fires four probes from inside your browser in parallel: a Cloudflare DNS-over-HTTPS lookup (does the domain resolve?), an HTTP reachability test, a favicon image probe, and a Resource Timing API measurement. The combined verdict is UP, UP (degraded), or DOWN, with response time, server IP, and DNS TTL displayed.

Pre-filled chips for the sites that go down often — Facebook, Instagram, X, ChatGPT, GitHub, Gmail, YouTube, WhatsApp — so you can click-and-check during the next big outage instead of typing.

Bonus: there's a status badge generator. Paste the generated markdown into any README and you get a live green/red pill that updates automatically via img.shields.io — free branded backlink, no account needed.

Try it: Is My Website Down Right Now?

2. Website Monitor Dashboard — Unlimited Free Monitors (Browser-Based)

The problem: UptimeRobot Free caps at 50 monitors, Better Uptime Free caps at 10, Pingdom starts at $15/month. For quick deploy-time checks or watching a handful of SaaS vendors during an incident, you do not need 24/7 server polling — you just need a grid of live statuses.

The tool: Add unlimited websites to monitor. Every 60 seconds the dashboard runs three probes per site (Cloudflare DNS, no-cors HTTP, favicon) while the tab is open. Each monitor card shows live UP/DOWN status, uptime percentage over the last 30 cycles, average response time, and an SVG sparkline of the response-time trend. Pause/resume per monitor, check-all button, auto-throttle when the tab is hidden.

All settings and history live in your browser's localStorage — close the tab and polling stops, open the tab and it resumes. No server involved, no data leaves your machine.

When to use this vs UptimeRobot: this dashboard is for live tab-open monitoring (during deploys, while tracking a vendor incident, NOC-style watch mode). UptimeRobot and similar services are for 24/7 background alerts — the two complement each other.

Try it: Free Website Uptime Monitor

Why Browser-Side Monitoring Actually Matters

Every server-based uptime service tells you if the site is up from their datacenter. That is the answer to a different question than "is it up from my network right now?" When you are on hotel WiFi, behind a corporate proxy, or on a residential ISP having a bad routing day, a browser-side probe is the only honest answer.

It also means the tool can never sell your data, because the tool never sees your data. Your URL, your DNS lookup, your HTTP request — all of it leaves your browser directly for the target site. There is no Teamz Lab server in the middle.

Tech Stack (for anyone curious)

DNS: Cloudflare DNS-over-HTTPS (cloudflare-dns.com/dns-query)

HTTP probe: fetch(url, { mode: 'no-cors' }) with a 6-second timeout

Favicon probe: new Image() with onload/onerror — bypasses CORS entirely

Response time: performance.now() around each probe

Storage: localStorage for monitors + history (30 cycles per monitor)

Sparkline: inline SVG, zero dependencies

Status badge: img.shields.io /website endpoint (free, rate-limited per IP)

No framework, no build step, no bundler. Two static HTML files with one inline script each.

What's Next

If the positive response is there, I am planning:

Webhook alerting — POST to a Discord/Slack webhook when status changes

Multi-region probes — let you check from other regions via public CORS proxies

Export/import — drop-in JSON for backing up or sharing your monitor list

PWA offline mode — pin the dashboard as a standalone app

If you use it, try it during the next big outage (statistically, sometime in the next 48 hours there will be one) and let me know what breaks. All feedback welcome — the contact is on the Teamz Lab site footer.

Originally published at https://tool.teamzlab.com?utm_source=devto&utm_medium=article&utm_campaign=2026-04-i-built-a-free-uptimerobot-alternative-that-runs-entirely-in-your-browser

CTI Threat Relationship Graph2 Knoten / 1 Relationen

CVE / Incident Software MITRE ATT&CK CWE Weakness IoC

IR-PLAYBOOK-RCEHIGH

Schritte anzeigen

SOC Incident Playbook: Remote Code Execution (RCE) Defense

WAF MitigationSofort

Virtuelles Patchen am Reverse Proxy / WAF für gefährdete URL-Pfade und Payloads aktivieren.

SecRule REQUEST_URI "@rx ..." "id:1001,phase:1,deny,status:403"

Web Shell ScanSofort

Web-Root auf neu angelegte Scripts, anomal modifizierte Dateien und Persistence scannen.

find /var/www -type f -name "*.php" -mmin -120

Outbound FilteringSofort

Ausgehenden Datenverkehr (Reverse Shells zu unbekannten IPs/Ports) blockieren.

ss -tunp | grep -E ":(4444|1337|8080|9001)"

Vendor Patching

Hersteller-Update in Staging validieren und schnellstmöglich in Produktion ausrollen.

apt update && apt --only-upgrade install <pkg>

1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate

Regeln anzeigen

Syntax validiert (0 Fehler)

title: Detect Exploitation - I Built a Free UptimeRobot Alternative That Runs Entirely in Your Browser
id: b714bb8d-9838-4ba3-9d1c-1cd828d977bc
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access

Syntax validiert (0 Fehler)

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "I Built a Free UptimeRobot Alt" ascii wide
    condition:
        any of them
}

Syntax validiert (0 Fehler)

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("I Built a Free UptimeRobot Alternative T")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

Syntax validiert (0 Fehler)

message: "*I Built a Free UptimeRobot Alternative T*"

Syntax validiert (0 Fehler)

CommonSecurityLog
| where Message has "I Built a Free UptimeRobot Alternative T"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

🎯

MITRE ATT&CK Matrix Navigator 14 Taktiken

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

💡 Tipp: Klicken Sie auf eine TTP, um Gegenmaßnahmen und SIEM-Erkennungsregeln anzuzeigen.Enterprise Matrix v14.1

🚀 Auf tsecurity.de entdecken

◀ VORHERIGER BEITRAG 11 Min

Self-Supervised Temporal Pattern Mining for smart agriculture microgrid orchestration under multi-jurisdictional compliance

Sichere Programmierung

NÄCHSTER BEITRAG 1 Min

5 top SIEM use cases in the enterprise

IT Security NachrichtenWeiterlesen ▶

Blättern: Pfeiltasten [ ← ] [ → ] · Tasten j / k · mobil: Wischen

Fokus-Vektor:

Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich I Built a Free UptimeRobot Alternative T.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.

🛡️ Angriffsfläche & Exposure

Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.

⚡ Empfohlene Sofortmaßnahmen

1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.

🔗 Semantisch verwandte Zero-Days MariaDB 11.7 VEC

Schnell-Prompts für Analysten

⚠️ DEFANGED SANDBOX VIEW (tsecurity.de): Alle Netzwerkindikatoren und URLs wurden neutralisiert (2 Indikatoren entschärft). Nur zur defensiven Analyse!

Format: python

#!/usr/bin/env python3
# Exploit Title: PoC for Target
import socket, sys
target = '192[.]168[.]1[.]10'
url = 'hxxp://target[.]local/vuln'
s = socket.socket()
s.connect((target, 80))
s.send(b'GET / HTTP/1.1\r\nHost: target.local\r\n\r\n')

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