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Updo is a Go-based CLI tool for monitoring website uptime, response times, and SSL certificate expiry with real-time alerts. It supports multi-target monitoring, webhook notifications (Slack, Discord), and optional AWS Lambda deployment across 13 regions for distributed monitoring.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | Owloops/updo |
| Owner | Owloops |
| Primary language | Go |
| License | MIT — OSI-approved |
| Stars | 993 |
| Forks | 47 |
| Open issues | 5 |
| Latest release | v0.4.8 (2026-05-26) |
| Last updated | 2026-05-26 |
| Source | https://github.com/Owloops/updo |
What updo is
Written in Go, Updo provides concurrent HTTP monitoring with configurable intervals, custom headers, POST/PUT support, response assertions, and structured JSON logging. It integrates with Prometheus/Grafana for metrics export and supports TOML-based configuration for complex setups, with optional multi-region execution via AWS Lambda.
Get the updo source
Clone the repository and explore it locally.
git clone https://github.com/Owloops/updo.gitcd updo# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Deploy as containerized workload or EC2 instance; Lambda multi-region requires AWS credentials and IAM configuration for cross-region function provisioning.
- Configure webhook URLs securely (use environment variables or secrets management for sensitive endpoints like Slack tokens).
- Set appropriate body_size_limit in config to avoid memory issues on large response payloads; default 1 MiB cap may truncate response assertions.
- For multi-target monitoring, use TOML config files instead of CLI flags; per-target customization (headers, timeouts) requires config-based setup.
- Plan for log aggregation and alerting backend; local JSON logging requires external systems (ELK, Loki, S3) for durable retention and querying.
When to avoid it — and what to weigh
- Need enterprise SLA guarantees — Updo is open-source with community support only. No commercial SLA, uptime guarantee, or vendor accountability for production-critical monitoring.
- Require complex synthetic transaction workflows — Updo monitors HTTP endpoints only; it cannot simulate browser interactions, multi-step user flows, or advanced application-layer synthetic tests.
- Prefer fully managed cloud monitoring platform — Updo requires self-hosting and operational overhead. For turnkey monitoring without infrastructure management, consider commercial alternatives (DataDog, New Relic, Uptime Robot).
- Need centralized data retention and historical analytics — Updo logs locally or sends alerts; it does not provide a built-in backend for long-term metric storage. Prometheus/Grafana integration is manual and operator-managed.
License & commercial use
MIT License: permits commercial use, modification, and redistribution with retention of copyright and license notice. No restrictions on proprietary use or closed-source distribution.
MIT License explicitly permits commercial deployment and closed-source modifications without royalties or restrictions. However, as an open-source community project with no vendor backing, use in business-critical contexts carries operational risk (community-only support, no SLA, volunteer-driven maintenance).
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Strong |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
No security audit or vulnerability disclosure data provided. Go runtime is generally memory-safe but SSL verification is configurable (skip-ssl flag exists—use with caution). Webhook integration transmits alert metadata over HTTPS; validate endpoint ownership. No secrets management built-in; rotate API keys/tokens used in headers or webhook URLs externally. Custom header support may leak sensitive data in logs; review TUI and JSON output for credential exposure.
Alternatives to consider
Uptime Robot
Commercial SaaS; fully managed, no infrastructure; advanced reporting and complex check types; higher cost and vendor lock-in.
Grafana OnCall + Prometheus Alertmanager
Open-source stack; more powerful alerting and aggregation; steeper operational complexity and learning curve.
Datadog or New Relic
Enterprise APM platforms; synthetic monitoring, distributed tracing, logs; significantly higher cost; tightly integrated SaaS ecosystems.
Build on updo with DEV.co software developers
Deploy Updo as a lightweight, self-hosted uptime monitor with Slack/webhook alerts. Assess fit for your team's operational needs and infrastructure constraints.
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updo FAQ
Can I monitor endpoints behind authentication?
How do I retain historical monitoring data?
Is multi-region Lambda monitoring reliable?
Can Updo replace commercial synthetic monitoring?
Work with a software development agency
If updo is on your shortlist, DEV.co can build around it. We are a custom software development company covering architecture, implementation, and production operations for open-source observability workloads.
Evaluate Updo for Your Infrastructure Monitoring
Deploy Updo as a lightweight, self-hosted uptime monitor with Slack/webhook alerts. Assess fit for your team's operational needs and infrastructure constraints.