Best observability tools in 2026
Understand what a system is doing from its telemetry: metrics, logs, traces, profiles and errors. This list has the top tools of each observability category, ranked by a published score. Of these, 26 are open source, 46 have a free plan and 41 can be self-hosted. Checked by hand on 30 September 2026.
How this list is ranked
Each active tool gets a score out of 100. Archived, end-of-sale and maintenance-only tools are left out.
- Capabilities: up to 75 points for the share of the category checklist that the tool's own documentation confirms. A tool meeting 8 of 10 items gets 60.
- Free to start: 15 points for a free plan or a free edition.
- Open or self-hostable: 10 points if it is open source or can be self-hosted.
Each category has a fixed checklist of capabilities (shown in the table below and on every tool page). An item counts only when the tool's own documentation confirms it; anything we could not confirm counts as not met. Checklists differ by category, so this list shows the top three of each category, each ranked against its own checklist. How long a tool has existed is deliberately not scored, so a new tool is not ranked below an older one for being new. Tools with the same score share a rank (shown as =), are listed A to Z within it, and the list never cuts between them. Nobody pays for a position.
Observability platforms
The top of 22 platforms tools, ranked on the platforms checklist. See the full ranking.
- 1
Elastic Observability
Logs, metrics, APM traces and synthetics built on Elasticsearch and Kibana, run yourself or on Elastic Cloud.
100 10 of 10 capabilities (75), free 15, open 10 - =2
groundcover
Kubernetes observability that uses an eBPF sensor and runs in your own cloud account, covering logs, traces, metrics and APM without code changes.
93 9 of 10 capabilities (68), free 15, open 10 - =2
OpenObserve
Single-binary store for logs, metrics and traces on object storage, with SQL search, dashboards and alerts. Self-host the open source build or use the pay-as-you-go cloud.
93 9 of 10 capabilities (68), free 15, open 10
Metrics and time-series databases
The top of 11 metrics tools, ranked on the metrics checklist. See the full ranking.
- 1
VictoriaMetrics
Prometheus-compatible time-series database and monitoring stack in single-node and cluster versions, with enterprise and managed cloud editions.
100 10 of 10 capabilities (75), free 15, open 10 - 2
Thanos
Adds a global query view, high availability and long-term object-storage retention to existing Prometheus servers; a CNCF project.
93 9 of 10 capabilities (68), free 15, open 10 - =3
Grafana Mimir
Horizontally scalable, multi-tenant long-term storage for Prometheus metrics from Grafana Labs, backed by object storage.
85 8 of 10 capabilities (60), free 15, open 10 - =3
InfluxDB
Time-series database for metrics and events; InfluxDB 3 Core is open source, with Enterprise and managed cloud editions.
85 8 of 10 capabilities (60), free 15, open 10
Log management
The top of 25 logs tools, ranked on the logs checklist. See the full ranking.
- 1
OpenSearch
Apache-licensed fork of Elasticsearch and Kibana run under the Linux Foundation. Indexes and searches logs, with OpenSearch Dashboards, alerting and trace analytics plugins.
100 10 of 10 capabilities (75), free 15, open 10 - =2
Elastic Stack (ELK)
Elasticsearch, Logstash, Kibana and Beats: full-text indexing and search of logs with Kibana dashboards and alerting. Self-host the free distribution or buy Elastic Cloud.
93 9 of 10 capabilities (68), free 15, open 10 - =2
Grafana Loki
Log aggregation system that indexes only labels, not full log text, and stores chunks in object storage. Queried with LogQL from Grafana; hosted as part of Grafana Cloud.
93 9 of 10 capabilities (68), free 15, open 10 - =2
Graylog
Centralised log collection with parsing pipelines, stream routing, search and alert conditions. Graylog Open is free to self-host; paid editions add security analytics and archiving.
93 9 of 10 capabilities (68), free 15, open 10 - =2
OpenObserve
Single-binary store for logs, metrics and traces on object storage, with SQL search, dashboards and alerts. Self-host the open source build or use the pay-as-you-go cloud.
93 9 of 10 capabilities (68), free 15, open 10 - =2
Parseable
Log and telemetry store written in Rust that keeps data as Parquet on object storage and queries it with SQL. Open source server, plus a hosted cloud and enterprise edition.
93 9 of 10 capabilities (68), free 15, open 10 - =2
Splunk
Log indexing and search platform (Splunk Enterprise, self-hosted, or Splunk Cloud) with the SPL query language, dashboards and alerting. Widely used for security and IT operations.
93 9 of 10 capabilities (68), free 15, open 10
Tracing and APM
The top of 22 tracing and apm tools, ranked on the tracing and apm checklist. See the full ranking.
- 1
Sentry
Captures exceptions and crashes from web, mobile and backend SDKs, groups them into issues with stack traces and releases, and alerts owners. Adds tracing, replays and logs.
93 9 of 10 capabilities (68), free 15, open 10 - =2
Apache SkyWalking
APM for distributed systems from the Apache Software Foundation: agents and service mesh probes collect traces, metrics and logs and draw service topology maps.
85 8 of 10 capabilities (60), free 15, open 10 - =2
Pinpoint
APM for large Java and PHP systems that traces transactions across services and draws a server map of their calls.
85 8 of 10 capabilities (60), free 15, open 10
Error and crash tracking
The top of 22 errors tools, ranked on the errors checklist. See the full ranking.
- 1
Sentry
Captures exceptions and crashes from web, mobile and backend SDKs, groups them into issues with stack traces and releases, and alerts owners. Adds tracing, replays and logs.
100 10 of 10 capabilities (75), free 15, open 10 - 2
Backtrace
Crash and error reporting from Sauce Labs for native apps, game engines, consoles and servers, including minidump and core dump processing.
93 9 of 10 capabilities (68), free 15, open 10 - =3
Airbrake
Long-running error and performance monitoring service that groups exceptions, links them to deploys and alerts by email or chat. Error and performance quotas are billed separately.
83 9 of 10 capabilities (68), free 15, open 0 - =3
Bugsee
In-app bug and crash reporting for mobile apps that attaches a video of the user's last actions, network traffic and logs to every report.
83 9 of 10 capabilities (68), free 15, open 0 - =3
BugSnag
SmartBear's error and crash monitoring for mobile, web and backend apps, known for stability scores per release. Adds performance spans.
83 9 of 10 capabilities (68), free 15, open 0 - =3
Honeybadger
Error tracking for Ruby, Elixir, PHP, Python and JavaScript apps, bundled with uptime checks, cron check-ins and log insights in one account.
83 9 of 10 capabilities (68), free 15, open 0 - =3
Rollbar
Error monitoring that groups exceptions into items, ties them to deploys and versions, and alerts through Slack, PagerDuty and others. Includes session replay.
83 9 of 10 capabilities (68), free 15, open 0
Continuous profiling
The top of 13 profiling tools, ranked on the profiling checklist. See the full ranking.
- 1
Grafana Pyroscope
Continuous profiling database that collects CPU, memory and other profiles from running applications so you can find hot code paths over time.
100 9 of 9 capabilities (75), free 15, open 10 - 2
zymtrace
Self-hosted, cluster-wide profiler for AI training and inference fleets: continuous whole-system CPU profiling plus GPU and accelerator profiling for CUDA, ROCm and other chips.
92 8 of 9 capabilities (67), free 15, open 10 - =3
Coroot
Open source observability that uses eBPF to build service maps and collect metrics, logs, traces and profiles without code changes, with root-cause hints.
83 7 of 9 capabilities (58), free 15, open 10 - =3
Elastic Observability
Logs, metrics, APM traces and synthetics built on Elasticsearch and Kibana, run yourself or on Elastic Cloud.
83 7 of 9 capabilities (58), free 15, open 10 - =3
Parca
Open source continuous profiler: an eBPF agent samples CPU stacks from every process on a host with no code changes, and the server stores profiles for querying as flame graphs over time.
83 7 of 9 capabilities (58), free 15, open 10
Real user monitoring and session replay
The top of 28 rum and replay tools, ranked on the rum and replay checklist. See the full ranking.
- 1
PostHog
Open source product suite with session replay, product analytics, feature flags, error tracking and LLM analytics sharing one event store. Hosted with a monthly free allowance, or self-hosted.
100 9 of 9 capabilities (75), free 15, open 10 - =2
OpenReplay
Open source session replay with developer tools attached: console logs, network requests and performance data alongside each recording, plus co-browsing. Self-host free or use a managed instance.
92 8 of 9 capabilities (67), free 15, open 10 - =2
Sentry
Captures exceptions and crashes from web, mobile and backend SDKs, groups them into issues with stack traces and releases, and alerts owners. Adds tracing, replays and logs.
92 8 of 9 capabilities (67), free 15, open 10
OpenTelemetry and telemetry pipelines
The top of 22 pipelines tools, ranked on the pipelines checklist. See the full ranking.
- =1
Bindplane
Telemetry pipeline built on OpenTelemetry: manages fleets of collectors from one console and filters, samples and routes logs, metrics and traces to any backend. Cloud or self-hosted.
100 9 of 9 capabilities (75), free 15, open 10 - =1
Cribl
Telemetry pipeline (Cribl Stream, Edge, Search and Lake) that filters, reshapes and routes logs between collectors and destinations such as Splunk or S3 to cut volume.
100 9 of 9 capabilities (75), free 15, open 10 - =1
Grafana Alloy
Grafana's OpenTelemetry Collector distribution with built-in Prometheus scraping and a pipeline configuration language; collects metrics, logs, traces and profiles. Replaces Grafana Agent.
100 9 of 9 capabilities (75), free 15, open 10 - =1
NXLog
Log collection agent and platform strong on Windows event logs: collects, converts and forwards logs to SIEM and observability tools. A free Community Edition is also available.
100 9 of 9 capabilities (75), free 15, open 10
Dashboards and visualization
The top of 9 dashboards tools, ranked on the dashboards checklist. See the full ranking.
- 1
Grafana
Open source dashboards and alerting over Prometheus, Loki, Elasticsearch, SQL databases and many other data sources.
100 8 of 8 capabilities (75), free 15, open 10 - 2
Nightingale
Open source alerting and dashboard platform that sits on Prometheus, VictoriaMetrics, Elasticsearch and other sources, with alert rules and notification routing.
81 6 of 8 capabilities (56), free 15, open 10 - 3
Amazon Managed Grafana
Fully managed Grafana workspaces on AWS with IAM Identity Center login and built-in CloudWatch, Prometheus and X-Ray data sources, billed per active user.
75 8 of 8 capabilities (75), free 0, open 0
LLM and AI observability
The top of 22 llm observability tools, ranked on the llm observability checklist. See the full ranking.
- =1
Braintrust
Evaluation and observability platform for AI products: logs production traces, runs evals and scorers, and offers a prompt playground and datasets.
100 10 of 10 capabilities (75), free 15, open 10 - =1
Future AGI
Open source platform to trace, evaluate, simulate and guard LLM and agent apps, including an AI gateway.
100 10 of 10 capabilities (75), free 15, open 10 - =1
Galileo
AI evaluation and observability platform with tracing, evaluation metrics and real-time guardrails for agents; hosted, VPC or on-prem.
100 10 of 10 capabilities (75), free 15, open 10 - =1
HoneyHive
Observability and evaluation platform for AI agents: OpenTelemetry-based tracing, automated and human evals, prompt versioning and production monitoring.
100 10 of 10 capabilities (75), free 15, open 10 - =1
LangSmith
LangChain's platform for tracing, evaluating and monitoring LLM apps and agents, usable with or without LangChain; also hosts agent deployments.
100 10 of 10 capabilities (75), free 15, open 10 - =1
LangWatch
Open source LLMOps platform: traces LLM and agent runs, runs evaluations and agent simulations, and helps optimize prompts; cloud or self-managed.
100 10 of 10 capabilities (75), free 15, open 10 - =1
Opik
Open source LLM and agent observability from Comet: tracing, test suites, evaluations and a prompt optimizer; self-host the same code as the cloud.
100 10 of 10 capabilities (75), free 15, open 10 - =1
PostHog
Open source product suite with session replay, product analytics, feature flags, error tracking and LLM analytics sharing one event store. Hosted with a monthly free allowance, or self-hosted.
100 10 of 10 capabilities (75), free 15, open 10
Side by side
| Tool | Pricing | Free plan | Open source | Self-hosted |
|---|---|---|---|---|
| Elastic Observability | Free plan | Yes | Yes | Yes |
| groundcover | Free plan | Yes | No | Yes |
| OpenObserve | Free plan | Yes | Yes | Yes |
| VictoriaMetrics | Free plan | Yes | Yes | Yes |
| Thanos | Free | Yes | Yes | Yes |
| Grafana Mimir | Free plan | Yes | Yes | Yes |
| InfluxDB | Free plan | Yes | Yes | Yes |
| OpenSearch | Free | Yes | Yes | Yes |
| Elastic Stack (ELK) | Free plan | Yes | Yes | Yes |
| Grafana Loki | Free plan | Grafana Cloud: 50 GB logs/month, 14-day retention | Yes | Yes |
| Graylog | Free plan | Yes | No | Yes |
| OpenObserve | Free plan | Yes | Yes | Yes |
| Parseable | Free plan | Yes | Yes | Yes |
| Splunk | Free plan | Splunk Free: 500 MB/day, one instance, no alerting | No | Yes |
| Sentry | Free plan | Developer: 5K errors/month, 1 user | No | Yes |
| Apache SkyWalking | Free | Yes | Yes | Yes |
| Pinpoint | Free | Yes | Yes | Yes |
| Sentry | Free plan | Developer: 5K errors/month, 1 user | No | Yes |
| Backtrace | Free plan | 25K errors/month, 1 month retention, 10 GB | No | Yes |
| Airbrake | Free plan | Yes | No | No |
| Bugsee | Free plan | Lite: 5 devices/month, 3-day retention | No | No |
| BugSnag | Free plan | 7.5K events/month, 1 user, 7-day retention | No | No |
| Honeybadger | Free plan | Developer: 5,000 errors/month | No | No |
| Rollbar | Free plan | 5K occurrences + 1K sessions/month | No | No |
| Grafana Pyroscope | Free plan | Yes | Yes | Yes |
| zymtrace | Free plan | CPU profiling on up to 5 machines | No | Yes |
| Coroot | Free plan | Yes | Yes | Yes |
| Elastic Observability | Free plan | Yes | Yes | Yes |
| Parca | Free | Yes | Yes | Yes |
| PostHog | Free plan | 5K session recordings and 1M events per month | Yes | Yes |
| OpenReplay | Free plan | Yes | Yes | Yes |
| Sentry | Free plan | Developer: 5K errors/month, 1 user | No | Yes |
| Bindplane | Free plan | 10 collectors, 100 GB/day, 1 project | No | Yes |
| Cribl | Free plan | Up to 1 TB/day | No | Yes |
| Grafana Alloy | Free | Yes | Yes | Yes |
| NXLog | Free plan | Yes | No | Yes |
| Grafana | Free plan | Yes | Yes | Yes |
| Nightingale | Free plan | Yes | Yes | Yes |
| Amazon Managed Grafana | Paid | No | No | No |
| Braintrust | Free plan | 1 GB processed data, 10k scores, 14-day retention | No | Yes |
| Future AGI | Free plan | Yes | Yes | Yes |
| Galileo | Free plan | Yes | No | Yes |
| HoneyHive | Free plan | 10,000 events/mo, 5 users, 30-day retention | No | Yes |
| LangSmith | Free plan | 5k base traces/mo, 1 seat | No | Yes |
| LangWatch | Free plan | 50k events/mo, 14-day data access, 2 users | Yes | Yes |
| Opik | Free plan | 25k spans/mo, 10 members, 60-day retention | Yes | Yes |
| PostHog | Free plan | 5K session recordings and 1M events per month | Yes | Yes |
Plans and prices change; check each tool's own site before you decide.