All Tools

Kilobat CLI

Free GPL-3.0-only macOS CLI for network diagnostics, Wi-Fi and traffic monitoring, with JSON output and a local MCP server. The desktop app is separate and proprietary.

Accesserty Pulse

Monitors interaction signals and detectable accessibility risks on live websites. Free plans for everyone and 14-day Pro trial.

alerty.ai

Free APM and monitoring for your FE, BE, DB, and more + free agent runs.

apimetrics.io

Automated API Performance Monitoring, Testing and Analytics. Free Plan, manually make API calls and Run from their West Coast servers

APIToolkit.io

All the tools you need to fully understand what's going on in your APIs and Backends. With automatic API contract validation and monitoring. The free plan covers servers with up to 10,000 requests per day.

appbeat.io

Website monitoring, 3 monitors free. They offer very reliable and affordable monitor service.

appspector.com

Mission control for remote iOS/Android/Flutter debugging. Free for small traffic usage (64MB of logs).

Arize AI

Machine learning observability for model monitoring and root-causing issues such as data quality and performance drift. Free up to two models.

assertible.com

Automated API testing and monitoring. Free plans for teams and individuals.

Axiom

Store up to 0.5 TB of logs with 30-day retention. Includes integrations with platforms like Vercel and advanced data querying with email/Discord notifiers.

Better Stack

Uptime monitoring, incident management, on-call scheduling/alerting, and status pages in a single product. The free plan includes ten monitors with 3-minute check frequency and status pages.

bleemeo.com

Free for 3 servers, 5 uptime monitors, unlimited users, unlimited dashboards, unlimited alerting rules.

Browse AI

Extracting and monitoring data on the web. 1k credits per month for free, equals 1k concurrent requests.

BugBug

Lightweight test automation tool for web applications. It is easy to learn and doesn't require coding. You can run unlimited tests on your own computer for free. You also get cloud monitoring and CI/CD integration for an additional monthly fee.

bugfender.com

Free up to 100k log lines/day with 24 hours retention

Bugsink

Error-tracking with Sentry-SDK compatability. Free for up to 5,000 errors/month, or unlimited use when self-hosted.

CatchJS.com

JavaScript error tracking with screenshots and click trails. Free for open-source projects.

CertKit

Manage SSL Certificate issuance, renewal, and monitoring. Search the Certificate Transparency Logs. Free for 3 certificates and 1 user after the beta.

CertObserver CT Search

Find public SSL/TLS certificates recorded in Certificate Transparency logs. CT search is free but CT monitoring is not.

Checkly

Code-first synthetic monitoring for modern DevOps. Monitor your APIs and apps at a fraction of the price of legacy providers. Powered by a Monitoring as Code workflow and Playwright. Generous free tier for devs.

cloudsploit.com

Amazon Web Services (AWS) security and compliance auditing and monitoring

Core Web Vitals History

Find Core Web Vitals history for a url or a website.

cronitor.io

Performance insights and uptime monitoring for cron jobs, websites, APIs and more. A free tier with five monitors.

deadmanssnitch.com

Monitoring for cron jobs. 1 free snitch (monitor), more if you refer others to sign up

downtimemonkey.com

60 uptime monitors, 5-minute interval. Email, Slack alerts.

drumbeats.io

Cron, heartbeat, and uptime monitoring with incident management and status pages. Free for up to 50 monitors with 1-min interval and unlimited team seats.

economize.cloud

Economize helps demystify cloud infrastructure costs by organizing cloud resources to optimize and report the same. Free for up to $5,000 spent on Google Cloud Platform every month.

elastic.co

Instant performance insights for JS developers. Free with 24-hour data retention

elmah.io

Error logging and uptime monitoring for web developers. Free Small Business subscription for open-source projects.

Embrace

Mobile app monitoring. Free for small teams with up to 1 million user sessions per year.

ETLR

Define, version, and deploy automation scripts using YAML. A developer-first alternative to drag-and-drop tools. Can be used for scheduled tasks, AI agents, and infrastructure monitoring. Free tier includes 100 credits/month.

exceptionless

Real-time error, feature, log reporting, and more. Free for 3k events per month/1 user. Open source and easy to self-host for unlimited use.

fivenines.io

Linux server monitoring with real‑time dashboards and alerting - free forever for up to 5 monitored servers at 60-seconds interval. No credit card required.

FlareWarden

Uptime, content, dependency, and SSL monitoring with multi-region verification and status pages. Free plan includes 15 monitors, 5-minute checks, and 90 days of history.

ghostinspector.com

Free website and web application monitoring. Single user, 100 test runs/month

GlitchTip

Simple, open-source error tracking. Compatible with open-source Sentry SDKs. 1000 events per month for free, or can self-host with no limits

Grafana Cloud

Grafana Cloud is a composable observability platform that integrates metrics and logs with Grafana. Free: 3 users, ten dashboards, 100 alerts, metrics storage in Prometheus and Graphite (10,000 series, 14 days retention), logs storage in Loki

honeybadger.io

Exception, uptime, and cron monitoring. Free for small teams and open-source projects (12,000 errors/month).

incidenthub.cloud

Cloud and SaaS status page aggregator - 20 monitors and 2 notification channels (Slack and Discord) are free forever.

inspector.dev

A complete Real-Time monitoring dashboard in less than one minute with a free forever tier.

instatus.com

Get a beautiful status page in 10 seconds. Free forever with unlimited subs and unlimited teams.

instrumentalapp.com

Beautiful and easy-to-use application and server monitoring with up to 500 metrics and 3 hours of data visibility for free

isitdownstatus.com

Free public JSON API returning real-time status for 500+ popular services (GitHub, Stripe, AWS, etc.). No auth required, CORS enabled.

Jam

Developer friendly bug reports in one click. Free plan with unlimited jams.

java-monitor.com

Free monitoring of JVM's and uptime

JSON IP

Returns the Public IP address of the client it is requested from. No registration is required for the free tier. Using CORS, data can be requested using client-side JS directly from the browser. Useful for services monitoring change in client and server IPs. Unlimited Requests.

keychest.net/speedtest

Independent speed test and TLS handshake latency test against Digital Ocean

Keywords AI

The best LLM monitoring platform. One format to call 200+ LLMs with 2 lines of code. 10,000 free requests every month and $0 for platform features!

konghq.com

API Marketplace and powerful private and public API tools. With the free tier, some features such as monitoring, alerting, and support, are limited.

letsmonitor.org

SSL monitoring, free for up to 5 monitors

linkok.com

Online broken link checker, free for small websites up to 100 pages, completely free for open-source projects.

loadfocus.com

Load and speed tests for websites, mobile apps and APIs, monitoring,... Free 5 tests/month, 120 clients/test, 1 monitor, 1 location

log.dog

LogDog is a remote debugging/logging SDK (iOS and Android) with a web ui. Captures all logs, requests and events in real-time and allows to intercept them. Free for up to 100MB of logs every month

logflare.app

Free for up to 12,960,000 entries per app per month, 3 days retention

logtail.com

ClickHouse-based SQL-compatible log management. Free up to 1 GB per month, three days retention.

logzab.com

Audit trail management system. Free 1,000 user activity logs per month, 1-month retention, for up to 5 projects.

Maileroo

SMTP relay and email API for developers. 5,000 emails per month, unlimited domains, free email verification, blacklist monitoring, mail tester and more.

ManageEngine Log360 Cloud

Log Management service powered by Manage Engine. Free Plan offers 50 GB storage with 15 days Storage Retention and 7 days search.

MarionetteOps.com

Server monitoring, public status pages, and service uptime monitoring.

mashape.com

API Marketplace and powerful tools for private and public APIs. With the free tier, some features are limited such as monitoring, alerting and support

memfault.com

Cloud device observability and debugging platform. 100 devices free for,, and devices.

Middleware.io

Middleware observability platform provides complete visibility into your apps & stack, so you can monitor & diagnose issues at scale. They have a free forever plan for Dev community use that allows Log monitoring for up to 1M log events, Infrastructure monitoring & APM for up to 2 hosts.

MonitorMonk

Minimalist uptime monitoring with beautiful status pages. The Forever Free plan offers HTTPS, Keyword, SSL and Response-time monitorming for 10 websites or api-endpoints, and provides 2 dashboards/status pages.

netdata.cloud

Netdata is an open-source tool to collect real-time metrics. It's a growing product and can also be found on GitHub!

NextReset

Free source-linked Codex reset history and official AI service incident updates, with a personal browser-local reset timer.

nixstats.com

Free for one server. E-Mail Notifications, public status page, 60-second interval, and more.

OnlineOrNot.com

OnlineOrNot provides uptime monitoring for websites and APIs, monitoring for cron jobs and scheduled tasks. Also provides status pages. The first five checks with a 3-minute interval are free. The free tier sends alerts via Slack, Discord, and Email.

OntarioNet.ca CN Test

Check if a website is blocked in China by the Great Firewall. It identifies DNS pollution by comparing DNS results and ASN information detected by servers in China versus servers in the United States.

openobserve.ai

200 GB Ingestion/month free, 15 Days Retention

opsdash.com

Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services

opsgenie.com

Powerful alerting and on-call management for operating always-on services. Free up to 5 users.

opswat.com

Security Monitoring of computers, devices, applications, configurations, Free 25 users and 30 days history users.

opswatgears.com

Security Monitoring of computers, devices, applications, configurations,... Free 25 users and 30 days history

Otterwatch

Daily SSL/TLS certificate monitoring: expiry alerts (30/7/1 day), chain and OCSP revocation checks, and certificate transparency issuance history. Free forever for 5 domains, no credit card.

paessler.com

Powerful infrastructure and network monitoring solution, including alerting, strong visualization capabilities, and basic reporting. Free up to 100 sensors.

pagecrawl.io

Monitor website changes, free for up to 6 monitors with daily checks.

pageradar.io

Monitor Core Web Vitals, SEO changes, and uptime for your websites. Free plan includes 5 URLs, daily Core Web Vitals monitoring, 10 HTML/SEO change monitors, 167-country affiliate link monitoring, and email alerts.

pagerly.io

Manage on-calls on Slack (integrates with Pagerduty, OpsGenie). Free up to 1 team

pagertree.com

Simple interface for alerting and on-call management. Free up to 5 users.

phare.io

Uptime Monitoring free for up to 100,000 events for unlimited projets and unlimited status pages.

pingbreak.com

Modern uptime monitoring service. Check unlimited URLs and get downtime notifications via Discord, Slack, or email.

Pingmeter.com

5 uptime monitors with 10-minute interval. Monitor SSH, HTTP, HTTPS, and any custom TCP ports.

pingpong.one

Advanced status page platform with monitoring. The free tier includes one public customizable status page with an SSL subdomain. Pro plan is offered to open-source projects and non-profits free of charge.

Prismix

Free REST API (GET /api/v1/statuses) returning real-time operational status for 75+ AI services including OpenAI, Anthropic, Gemini, Mistral, and more. No authentication required. [Free tier available with Pro at $10/month]

Pulsetic

10 monitors, 6 Months of historical Uptime/Logs, unlimited status pages, and custom domains included! For infinite time and unlimited email alerts for free. You don't need a credit card.

RedirHub

API-first URL redirect infrastructure with custom nameservers, edge network, HTTPS, and proactive link monitoring. Free plan includes 2 hostnames, 100K requests per month, auto-SSL, path forwarding, and REST API access.

redsmin.com

Online real-time monitoring and administration service for Redis, 1 Redis instance free

RoboMiri.com

RoboMiri is a stable uptime monitor that offers a wide range of monitors: cronjob, keyword, website, port, ping. Twenty-five uptime checks with 3-minute interval checks for free. Alerts via Phone Call, SMS, Email, and Webhooks.

robusta.dev

Powerful Kubernetes monitoring based on Prometheus. Bring your own Prometheus or install the all-in-one bundle. The free tier includes up to 20 Kubernetes nodes. Alerts via Slack, Microsoft Teams, Discord, and more. Integrations with PagerDuty, OpsGenie, VictorOps, DataDog, and many other tools.

rollbar.com

Exception and error monitoring, free plan with 5,000 errors/month, unlimited users, 30 days retention

Runframe

On-call alerting, incident management, and public/private status pages. The free plan includes up to 5 users, 1 team, 1 on-call schedule, basic status pages, incident lifecycle, and Slack-native incident response.

Semaphr

Free all-in-one kill switch for your mobile apps.

Servervana

Advanced uptime monitoring with support for large projects and teams. Provides HTTP monitoring, Browser based monitoring, DNS monitoring, domain monitoring, status pages and more. The free tier includes 10 HTTP monitors, 1 DNS monitor and one status page.

Simple Observability

Powerful server monitoring in a unified platform for metrics and logs, with no setup complexity. Free for one server.

sitemonki.com

Website, domain, Cron & SSL monitoring, 5 monitors in each category for free

sitesure.net

Website and cron monitoring - 2 monitors free

Smart Grow Logs

Centralized log management platform with end-to-end encryption, real-time alerts, and multi-platform SDKs. Free tier includes up to 3.000 logs per day.

speedchecker.xyz

Performance Monitoring API, checks Ping, DNS, etc

Squadcast.com

Squadcast is an end-to-end incident management software designed to help you promote SRE best practices. Free forever plan available for up to 10 users.

stackdriver.com

Free monitoring up to 10 servers/hosted services

statuscake.com

Website monitoring, unlimited tests free with limitations

statusgator.com

Status page monitoring, 3 monitors free

supaguard.app

Synthetic monitoring from 20+ global regions. The free tier includes 1,000 browser checks/mo with AI-driven self-healing and automated test generation.

superlog.sh

Open-source OpenTelemetry observability (traces, logs, and metrics) with AI-agent incident investigation. The free tier includes 1M spans, 5M logs, and 10M metric points per month with 30-day retention, no credit card required. Fully open-source and self-hostable.

SweetUptime

Server monitoring, uptime monitoring, DNS & domain monitoring. Monitor 10 server, 10 uptime, and 10 domain for free.

syagent.com

Noncommercial free server monitoring service, alerts and metrics.

thousandeyes.com

Network and user experience monitoring. 3 locations and 20 data feeds of major web services free

Tomorrow.io Weather API

Offers free plan of weather API. Provides accurate and up-to-date weather forecasting with global coverage, historical data and weather monitoring solutions.

tyk.io

API management with authentication, quotas, monitoring and analytics. Free cloud offering

UptimeObserver.com

Get 20 uptime monitors with 5-minute intervals and a customizable status page-even for commercial use. Enjoy unlimited, real-time notifications via email and Telegram. No credit card needed to get started.

uptimerobot.com

Website monitoring, 50 monitors free

uptimetoolbox.com

Free monitoring for five websites, 60-second intervals, public statuspage.

Wachete

monitor five pages, checks every 24 hours.

watchsumo.com

Free website monitoring, 50 http(s), Ping or keywords, every 5+ minutes

Whitespace

One-click bug reports straight in your browser. Free plan with unlimited recordings for personal use.

Xitoring.com

Uptime monitoring: 20 free, Linux and Windows Server monitoring: 5 free, Status page: 1 free - Mobile app, multiple notification channel, and much more!

zenduty.com

End-to-end incident management, alerting, on-call management, and response orchestration platform for network operations, site reliability engineering, and DevOps teams. Free for up to 5 users.

zonewatcher.com

Automatic backups and DNS change monitoring. 1 domain free

Easypanel

Self-hosted application deployment panel for Docker images, Docker Compose apps and databases on your own Linux server. The permanent free plan supports up to 3 projects, unlimited services and deployments, and basic monitoring. Server hosting costs are separate; the software is proprietary.