No. 18of 30 ·Error Monitoring Software

Warnly

Web · Self-hosted · API

Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Warnly is ranked #18 of 30 in error monitoring software on Freedom251. It runs on API, Self-hosted, Web. There is a free plan.

Warnly plans and pricing

All plans

Free and open source Free No premium features or usage limits · self-hosted warnly.io · 9 Oct 2026

Compared on error monitoring software

Free plan: Yes
Frontend monitoring: No
Release tracking: Yes
Deployment model: self-hosted

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The record

Product: Warnly is an open-source exception monitoring platform designed for development teams.
Self-hosting: Warnly is designed to run on your infrastructure, with Docker, Kubernetes, or bare-metal deployment listed on its site.
Data control: The maker says self-hosting keeps data on your infrastructure and gives you control over sensitive error information.
Error grouping: Warnly groups similar error events into issues using fingerprints and similarity matching across error characteristics, stack traces, messages, and context.
Event details: Events can include an error message and stack trace, environment and release information, user and device context, timestamps, and unique identifiers.
Sentry compatibility: Warnly accepts error events through an HTTP API and supports the Sentry envelope format for compatibility with Sentry clients.
Project access: Projects have their own API keys, and teams and users can be assigned to projects to manage access to issues.
Authentication: Users can authenticate with local accounts or external providers such as OIDC.
Integrations and infrastructure: The documented setup uses MySQL for primary data storage and ClickHouse for analytics and event storage.
Observability: The server configuration supports OpenTelemetry tracing and an optional Prometheus metrics endpoint.
Security and compliance: The maker describes Warnly as self-hosted and says data stays on your infrastructure; the opened pages did not state a compliance certification.
Requirements: The quickstart lists Docker and Docker Compose as recommended, Go 1.25 or later for building from source, MySQL 8.0 or compatible, and ClickHouse 24 or later.
Limits and roadmap: The repository roadmap marks mobile and frontend exception monitoring, swappable storage, and SLO and flexible alerting rules as not implemented.
Support and community: The site links to GitHub for contributions and community, and to online documentation for setup guidance.
Price from: Free

Where it ranks on Freedom251

Best Error Monitoring Software in 2026#18 of 30

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Sources

docs.warnly.io· checked 9 Oct 2026
warnly.io· checked 9 Oct 2026
docs.warnly.io/concepts· checked 9 Oct 2026
docs.warnly.io/quickstart· checked 9 Oct 2026
docs.warnly.io/essentials/settings· checked 9 Oct 2026
github.com/vk-rv/warnly· checked 9 Oct 2026