Best Free Monitoring Tools in 2026
Grafana and Prometheus remain the free, self-hosted backbone for metrics and dashboards, while Sentry catches errors before users report them and Uptime Kuma watches whether your sites are even up. Hosted options like Datadog and New Relic add a genuinely usable free tier if you'd rather not run your own servers. Every pick below still offers a real, current free tier in 2026, not a 14-day trial.
Real metrics, logs, traces, and uptime checks without an enterprise invoice, from self-hosted open source to hosted free tiers that don't expire.
Most teams find out their monitoring stack costs real money the same week production breaks and the bill for a decent APM tool lands north of $1,000 a month. That's a hard sell for a side project, a five-person startup, or an engineer who just wants to know when a server falls over. The good news: the observability world has a deep bench of tools that are free by design, not just free for 14 days. Of the 10,000+ tools Toolradar tracks, 52 in the Monitoring category offer a genuine free tier, spanning metrics, logs, traces, error tracking, and uptime checks.
We picked the 10 below by checking each tool's free tier against its current 2026 pricing page, confirming the tool is still actively maintained, and ranking by how well it covers a real gap in the observability stack: metrics and dashboards, error tracking, log aggregation, full-stack APM, and uptime monitoring. We dropped anything whose "free" plan turned out to be a disguised trial, and we favored self-hosted open-source options where the free tier is unlimited by definition.
Top Picks
Picked by editorial review, informed by G2 and Capterra review volume and rating and by media mentions, the signals behind our category rankings. How we rate
| Tool | Starting price | Rating | Best for |
|---|---|---|---|
| Grafana | From $19/mo | 4.5 275 reviews | Teams that want a single dashboard for data pulled from Prometheus, Loki, and a dozen other sources. |
| Prometheus | Free | 4.5 61 reviews | Engineers who want to pull, store, and alert on time-series metrics from Kubernetes and cloud-native services without a vendor. |
| Sentry | Free plan | 4.6 297 reviews | Developers who want to catch and triage production errors before a user files a support ticket. |
| Uptime Kuma | Free | 4.6 348 reviews | Anyone comfortable running a Docker container who wants unlimited uptime checks without a monitor cap. |
| SigNoz | From $199/mo | n/a | Teams that want a self-hosted, Datadog-style all-in-one without the per-host bill. |
| Datadog | From $48/mo | 4.4 726 reviews | Teams evaluating a full-stack commercial platform before committing spend to a paid plan. |
| New Relic | From $10/mo | 4.4 783 reviews | Solo developers and small teams who want APM, infrastructure, and synthetics without juggling host limits. |
| Loki | Free | 4.0 49 reviews | Teams already using Grafana and Prometheus who want logs in the same free, self-hosted stack. |
| UptimeRobot | From $29/mo | 4.6 1,535 reviews | Individuals monitoring personal sites or side projects who want a hosted checker with zero setup. |
| Healthchecks.io | From $5/mo | n/a | Teams that need to know when a cron job, backup script, or scheduled task silently stops running. |
Teams that want a single dashboard for data pulled from Prometheus, Loki, and a dozen other sources.
- Pro: Self-hosted Grafana OSS is completely free with no feature gate or seat limit
- Pro: Grafana Cloud's free tier adds 10,000 metrics series, 50GB of logs, and 50GB of traces for three users with 14-day retention
- Pro: Supports 150+ data sources out of the box, including Prometheus, Loki, Elasticsearch, and CloudWatch
- Con: Self-hosting means you own upgrades, storage, and uptime for the Grafana stack itself
- Con: Grafana Cloud's 14-day retention is short for anyone doing month-over-month trend analysis
Grafana OSS is completely free for self-hosted visualization.
Watch out
14-day retention on Free; 30 days on Pro (logs/traces)
Engineers who want to pull, store, and alert on time-series metrics from Kubernetes and cloud-native services without a vendor.
- Pro: 100% free and open source under the Apache 2.0 license, with no paid tier at all
- Pro: PromQL is the query language most other observability vendors now support
- Pro: Native service discovery for Kubernetes, Consul, and EC2 keeps configuration light
- Con: No built-in long-term storage; retention beyond a few weeks needs Thanos, Mimir, or Cortex
- Con: Alerting and dashboards live in separate tools, so day-one setup takes longer than a SaaS signup
Prometheus is 100% free and open source (Apache 2.0).
Watch out
Storage costs grow linearly with metric cardinality and retention period
Developers who want to catch and triage production errors before a user files a support ticket.
- Pro: Free Developer plan includes 5,000 errors a month with 30-day retention, no credit card required
- Pro: SDKs for essentially every language and framework, from Python to React Native
- Pro: Release tracking and source maps pinpoint the exact commit that introduced a bug
- Con: Limited to one user on the free plan; teams need a paid seat to collaborate on issues
- Con: 5,000 errors a month disappears fast on a high-traffic app with one noisy exception
Sentry is the error tracking standard for development teams, and its pricing is reasonable at low volumes but scales aggressively with event count.
Watch out
Performance transactions are billed separately from errors: monitoring API response times and page loads consumes a separate quota. Heavy transaction monitoring can double your bill vs error tracking alone
Anyone comfortable running a Docker container who wants unlimited uptime checks without a monitor cap.
- Pro: MIT-licensed and entirely free, with no paid tier, monitor limit, or feature gate
- Pro: HTTP, TCP, ping, DNS, and Docker container checks all included
- Pro: Sends alerts via Telegram, Discord, Slack, Pushover, and email out of the box
- Con: You run and patch the server yourself; the project offers no managed cloud option
- Con: No multi-region checks, so an outage on your own host can blind the monitor too
Uptime Kuma's pricing is exceptionally generous, being entirely free.
Teams that want a self-hosted, Datadog-style all-in-one without the per-host bill.
- Pro: Community Edition is free and open source with no usage cap when self-hosted
- Pro: Built on OpenTelemetry, so instrumentation isn't locked to a proprietary agent
- Pro: Combines APM, log management, and distributed tracing in one tool instead of three
- Con: Self-hosting means running a ClickHouse cluster, real infrastructure overhead at scale
- Con: Younger project than Grafana or Prometheus, so the integration ecosystem is smaller
SigNoz offers a very generous pricing model with its free Community tier, providing full features and unlimited data for self-hosted users.
Teams evaluating a full-stack commercial platform before committing spend to a paid plan.
- Pro: Free tier covers up to 5 hosts with core infrastructure dashboards and 1,000+ integrations
- Pro: No time limit on the free plan; it's a permanent tier, not a trial
- Pro: One of the broadest integration libraries in the industry for cloud services and frameworks
- Con: Free tier caps metric retention at 1 day and excludes APM, log management, and synthetic monitoring
- Con: 5-host limit is tight for anything beyond a small side project or proof of concept
Datadog is the most comprehensive observability platform, infrastructure monitoring, APM, logs, RUM, security, and 750+ integrations in one place.
Watch out
High-water mark billing: Datadog measures host count hourly and bills based on the highest usage (minus top 1%). Auto-scaling environments that spike to 200 hosts for 2 hours but normally run 50 will be billed at ~200 hosts for the entire month
Solo developers and small teams who want APM, infrastructure, and synthetics without juggling host limits.
- Pro: 100GB of data ingest included free every month, forever, with no credit card required
- Pro: Free tier unlocks all 50+ platform capabilities, including APM, dashboards, and alerting, not a stripped-down subset
- Pro: One full-platform user included free, plus unlimited basic users on the account
- Con: 100GB disappears quickly once verbose logging or high-cardinality metrics are turned on
- Con: Overage pricing, roughly $0.30 to $0.50 per gigabyte, can surprise teams without ingest alerts
New Relic's freemium model is generous, offering 100 GB/month and a full platform user for free.
Teams already using Grafana and Prometheus who want logs in the same free, self-hosted stack.
- Pro: Free and open source under AGPLv3, with no license cost to self-host
- Pro: Indexes labels, not full log text, keeping storage and query costs far lower than Elasticsearch
- Pro: Uses LogQL, a PromQL-like query language Prometheus users already know
- Con: Self-hosting still means running object storage and the Loki components yourself
- Con: Grafana Cloud's hosted free tier caps out at 50GB of logs before billing kicks in
Loki's pricing is exceptionally fair and generous, as it is entirely free and open-source.
UptimeRobot
- 4.4 on SourceForge (764 reviews)
- 4.6 on Trustpilot (381 reviews)
- 4.7 on G2 (316 reviews)
- 4.8 on Capterra (74 reviews)
Individuals monitoring personal sites or side projects who want a hosted checker with zero setup.
- Pro: Free plan includes 50 monitors at 5-minute check intervals, no credit card required
- Pro: One basic public status page and 3 months of history included free
- Pro: Email alerts and a simple dashboard mean setup takes minutes, not an afternoon
- Con: Free plan is restricted to personal, non-commercial use; monitoring a business or client site needs a paid plan starting around $7 a month
- Con: 5-minute check interval is slower than the 1-minute checks on paid plans, so short outages can slip through
UptimeRobot's pricing is generally fair, with a generous Free tier offering 50 monitors.
Teams that need to know when a cron job, backup script, or scheduled task silently stops running.
- Pro: Free plan includes 20 checks with unlimited team members
- Pro: Simple integration: a single HTTP ping at the end of a script is all that's required
- Pro: Supports email, Slack, PagerDuty, and dozens of other integrations on the free plan
- Con: 20 checks is a hard ceiling for anyone running more than a handful of scheduled jobs
- Con: It only tells you a job didn't run, not why. It's a complement to real monitoring, not a replacement
Healthchecks.io offers a very generous free tier and a well-structured pricing model.
Watch out
Overage for log entries beyond tier limits
What Is a Monitoring Tool?
A monitoring tool collects signals about a running system, whether that's a server, a container, a website, or an application, and turns them into something a human or an alert can act on. That covers a few distinct jobs: metrics tools like Prometheus track numeric time-series data such as CPU, request latency, and queue depth; log aggregators like Loki collect and search text output from every service; error trackers like Sentry catch exceptions and stack traces the moment code breaks; APM platforms like Datadog and New Relic trace individual requests end to end; and uptime checkers like Uptime Kuma simply ask "is it up?" on a schedule.
Most real stacks combine two or three of these rather than relying on one tool for everything, which is why the free-tier options below are organized by which piece of the stack they cover.
Why Free Monitoring Matters
Observability spend is one of the easiest line items to let balloon. A team that starts on a free tier and grows into per-host or per-gigabyte pricing without watching usage can end up paying more for monitoring than for the infrastructure being monitored. Free and open-source tools sidestep that risk entirely for teams willing to self-host, and even the hosted free tiers here, from Datadog, New Relic, and UptimeRobot, are generous enough to run a real side project or early-stage startup without a credit card.
The bigger risk isn't cost, though, it's running nothing at all. Teams that skip monitoring because every option looks expensive find out about outages from users on social media instead of from an alert. Every tool on this list closes that gap for zero dollars.
Key Features to Look For
Real, uncapped retention (Essential)
Some free tiers cap metric or log retention at 24 hours or 14 days, fine for a live dashboard but useless for spotting a trend over a month.
Alerting channels beyond email (Essential)
Slack, PagerDuty, Discord, and webhook support matter more than a pretty dashboard when something breaks in the middle of the night.
A permanent free tier, not a disguised trial (Essential)
Self-hosted tools like Prometheus and Uptime Kuma have no usage cap by definition. Hosted free tiers should be a permanent plan you can stay on indefinitely.
Coverage of the piece of the stack you actually need (Important)
Metrics, logs, traces, errors, and uptime checks are different jobs. Pick the tool that covers your actual gap instead of the one with the flashiest marketing.
Integration breadth (Important)
Native support for your language, framework, and cloud provider saves days of writing custom exporters.
A visible upgrade path (Nice to have)
Free tiers eventually get outgrown. Know what the next tier costs before you're locked into a tool you can't afford to leave.
Mistakes to Avoid
- ×
Picking one all-in-one paid platform before trying the free open-source combo (Grafana plus Prometheus plus Loki) that covers most of the same ground.
- ×
- ×
Treating uptime monitoring as optional because the server has never gone down, then finding out during the first outage.
- ×
Assuming a hosted free tier's non-commercial restriction, UptimeRobot's for example, doesn't apply to a monetized side project.
- ×
Confusing an error tracker like Sentry with full observability. Errors alone won't tell you why a request was slow.
Expert Tips
- →
Start with Prometheus plus Grafana for metrics. It's the combination every other vendor's dashboards are trying to imitate, and it's free forever.
- →
Wire Healthchecks.io or a similar dead man's switch into every cron job on day one. A silent failure is worse than a loud one.
- →
Don't self-host log aggregation until log volume actually justifies it. Grafana Cloud's 50GB free logs tier covers most small apps.
- →
- →
Pair an error tracker like Sentry with an uptime checker like Uptime Kuma. One catches broken code, the other catches a dead server, and neither substitutes for the other.
The Bottom Line
Grafana and Prometheus cover metrics for free indefinitely, Sentry catches the errors that actually matter, and Uptime Kuma watches whether anything is even reachable. All of it fits inside the 52 tools in Toolradar's Monitoring category that offer a genuine free tier, so there's no reason to pay for observability before you actually need to scale past it.
Frequently Asked Questions
What is the best free monitoring tool overall?
For most teams, the combination of Grafana and Prometheus is the strongest free option because it's genuinely free with no usage cap when self-hosted, not a capped trial. If you'd rather not run servers, Datadog's free tier (5 hosts) or New Relic's free tier (100GB of data a month, forever) get you a hosted full-stack platform at no cost.
Is Sentry actually free?
Yes. Sentry's Developer plan is free forever and includes 5,000 errors a month with 30-day retention, no credit card required. It's limited to one user, so teams that need multiple people triaging issues will eventually need the paid Team plan, which starts at $26 a month.
What's the difference between uptime monitoring and full observability?
Uptime monitoring tools like Uptime Kuma and UptimeRobot answer one question: is the service reachable right now? Full observability platforms like Datadog, New Relic, or SigNoz go further, tracing individual requests and aggregating logs so you know why something is slow or broken, not just that it is.
Can I really run production monitoring on free tools?
Yes. Plenty of teams run Prometheus, Grafana, and Loki in production for free because self-hosted open source has no usage cap by design. The tradeoff is operational: you own uptime, upgrades, and storage for the monitoring stack itself, which is a real cost even if no invoice shows up.
How do I monitor a cron job or scheduled task for free?
Use a dead man's switch service like Healthchecks.io, which is free for up to 20 checks. Your script pings a URL when it finishes; if the ping doesn't arrive on schedule, Healthchecks.io alerts you by email, Slack, or PagerDuty. It's the simplest way to catch a silently failed backup or scheduled job.
Cite this page: Toolradar, "Best Free Monitoring Tools in 2026", updated August 2026, https://toolradar.com/guides/best-free-monitoring-tools
Sources
Prices and plan details on this page come from each vendor's own pricing page, re-checked by the Toolradar pricing tracker:
- Grafana pricing, checked
- Prometheus pricing, checked
- Sentry pricing, checked
- Uptime Kuma pricing, checked
- SigNoz pricing, checked
- Datadog pricing, checked
- New Relic pricing, checked
- Loki pricing, checked
- UptimeRobot pricing, checked
- Healthchecks.io pricing, checked
Related Guides
Some offers on this page may be paid placements or contain affiliate links.