13 of these carry no recorded demerit and are indistinguishable under every signal we hold; their order rotates daily. 11 are demoted with the reason named, and 0 are listed last because they are not generally available or are not a free offer. How we rank.
Free
Free server monitoring service with alerts and metrics. Up to 25 servers and 25 uptime monitoring instances.
Monitoring
Read and confirmed 2026-11-04
Free
Application monitoring (APM, errors, logging) — Our free plan is perfect for startups, hobby, or side-projects 30K requests 1GB logging 5-day retention
Monitoring
Read and confirmed 2026-11-10
Always Free
Always Free: all non-chargeable Google Cloud metrics, first 1M monitoring API calls/month. Dashboards, alerting, and uptime checks for GCP resources
Monitoring
Read 2026-10-25 · catalogue date 2026-08-18
Free
10 uptime monitors, 3 GB logs (3-day retention), 100K exceptions/mo, 5K session replays, 30 GB metrics, 1 status page, 1 responder
Monitoring
Read and confirmed 2026-10-30
Free
Powerful server monitoring in a unified platform for metrics and logs, with no setup complexity. Free for one server.
Monitoring
Read and confirmed 2026-11-08
Lite
Server and website monitoring (formerly Nixstats) — free Lite plan: 1 server monitor, 5 site monitors, 10-minute check interval, 24-hour data retention, email alerts
Monitoring
Read and confirmed 2026-10-26
Free OSS
Grafana OSS — the self-hosted dashboarding and alerting front end, free under AGPL-3.0-only with Apache-2.0 exceptions. Unifies 150+ data sources into one dashboard and supports observability-as-code.
Monitoring
Read 2026-10-28 · catalogue date 2026-08-27
Free
Full observability platform — 100 GB data ingest/month, 1 full platform user, unlimited basic users, 500 synthetic checks, 8+ days retention
Monitoring
Read and confirmed 2026-10-24
Free OSS
OpenTelemetry-native observability with logs, metrics and traces in one tool. The community edition is free to self-host.
Monitoring
Read 2026-10-22 · catalogue date 2026-08-27
Free
Free tier includes access to all Grafana Cloud services with limited usage, 14-day retention, and community support. 10k metric series, 50 GB logs, and 50 GB traces are included.
Monitoring
Read 2026-11-03 · catalogue date 2026-08-14
Personal
Observability platform — 500 GB ingest/month, 25 GB storage, 30-day retention, 2 datasets, 1 user, 10 GB-hrs/mo query compute, 256 fields/dataset, 3 monitors, Email/Discord notifiers only
Monitoring
Read and confirmed 2026-10-22
Free
Application performance monitoring — free for first 100,000 traces/month.
Monitoring
Read and confirmed 2026-11-07
Free
Full-stack observability platform — free forever plan: 100 GB/month data (APM, logs, infrastructure, traces, RUM, synthetics, database, serverless), 1,000 RUM sessions/month, 20,000 synthetic checks/month, 14-day data retention, unlimited users
Monitoring
Read and confirmed 2026-10-26
Free
Free for 3 servers, 5 uptime monitors, unlimited users, unlimited dashboards, unlimited alerting rules.
Monitoring
Read 2026-11-01 · catalogue date 2026-07-11
−1 stale_verification Our last read of the vendor's pricing page, on 2026-11-01, found the same terms as an earlier read we had declined to record. This is our confidence in the record, not a change by the vendor.
Free OSS
Free OSS (Apache 2.0). CNCF graduated time-series monitoring and alerting.
Monitoring
Read 2026-10-10 · catalogue date 2026-08-22
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-10, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor.
Free
Uptime and status page monitoring — free plan: 20 monitors (HTTP, port, ping, keyword), 5-minute check interval, 1 basic status page with real-time updates and subscriber notifications, 1 seat, 1 server monitoring agent, email and webhook alerts
Monitoring
Read 2026-10-26 · catalogue date 2026-07-07
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-26, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
Free
A complete Real-Time monitoring dashboard in less than one minute with a free forever tier.
Monitoring
Read 2026-10-11 · catalogue date 2026-07-11
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-11, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor.
Free
Netdata is an open-source tool to collect real-time metrics. It's a growing product and can also be found on GitHub!
Monitoring
Read 2026-10-24 · catalogue date 2026-07-08
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-24, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor.
Basic (Free)
Observability platform — Logs: 500 MB/day ingestion, 7-day retention. Monitoring: 3 hosts, 3 containers/host, 30-min data retention, 1 alert rule.
Monitoring
Read 2026-10-28 · catalogue date 2026-07-05
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-28, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
Developer
Developer tier: 1 user, 5K errors/month, 5M spans/month, 50 session replays, 5GB application logs, 1GB attachments
Monitoring
Read 2026-11-02 · catalogue date 2026-08-11
−1 stale_verification We cannot confirm this offer: 1 consecutive re-check attempt has failed (most recently 2026-11-02 — Could not parse AI response), never confirmed since it was indexed. This is our inability to verify, not a change by the vendor.
Free
Infrastructure monitoring free for up to 5 hosts with 1-day metric retention
Monitoring
Read 2026-11-05 · catalogue date 2026-08-12
−1 stale_verification We cannot confirm this offer: 9 consecutive re-check attempts have failed (most recently 2026-11-05 — The truncated pricing page text contains navigation menus and product listings but no actual pricing details, free tier terms, or host/retention limits for Infrastructure Monitoring, so the stored deal info cannot be verified.), never confirmed since it was indexed. This is our inability to verify, not a change by the vendor.
Free OSS
Free OSS (Apache 2.0). CNCF graduated distributed tracing system.
Monitoring
Read 2026-10-10 · catalogue date 2026-08-26
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-10, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor.
Free
Superseded: As of 2026-08-28, xitoring.com reads: The page offers a 14-day free trial, and then paid plans starting at $4.99/mo for Uptime + SSL. We are not publishing our stored Xitoring.com terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones.
Monitoring
Read 2026-10-29 · catalogue date 2026-07-13
−3 free_tier_withdrawn Recorded free tier removal on 2026-08-28: The page highlights a 14-day free trial, and then lists paid plans starting at $4.99/mo. Unconfirmed. We could not check this change against an archived copy of Xitoring.com's page, so it does not count toward the rating. Source: https://xitoring.com/
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-29, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
Trial
Linux server monitoring with real-time dashboards and alerting — no permanent free tier. 14-day free trial with no credit card required; paid plans from €19/month.
Monitoring
Read and confirmed 2026-10-25
−3 free_tier_withdrawn Recorded free tier removal on 2026-05-15: fivenines.io removed its Free plan (5 monitors, 1 team member, 1 month of data retention) between the archived copies of its site from 2026-05-13 and 2026-05-15. Paid plans now start at €19 a month, with a 14-day free trial. Source: https://fivenines.io/
−2 time_limited_offer Tier "Trial" is a trial that expires, not an ongoing free tier.