Tessary vs UptimeRobot
Tessary and UptimeRobot are both uptime & monitoring tools aimed at developers and small businesses. Both have a free plan.
Open-source monitoring that finds why production AI agents fail
Uptime, SSL and cron monitoring with status pages and a free tier
| Pricing | Open source | Freemium · $10 |
| Starting price | Not published | $10/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Small businesses, Enterprise | Developers, Small businesses, Agencies, Freelancers |
| Platforms | web, linux | web, ios, android |
| Country | — | — |
| Rating | — | — |
Choose Tessary if
Engineering teams running AI agents in production with OpenTelemetry traces who want every trace checked and failures explained.
- Apache 2.0 open source with free self-hosting
- Checks every trace instead of a sampled subset
- RCA links failures to specific commits when a repo is connected
Look elsewhere if: Teams that want a mature, fully supported observability suite or an eval-first workflow (Datadog, Braintrust).
Choose UptimeRobot if
Small teams and agencies that want reliable external uptime checks, cron heartbeats and status pages for a few dollars a month.
- Very quick setup; a monitor runs within a minute
- Paid tiers are cheap for the monitor counts included
- Wide range of monitor types including heartbeat and DNS
Look elsewhere if: Teams needing logs, tracing, on-call scheduling or synthetic browser journeys (Better Stack, Datadog, Checkly).
Tessary vs UptimeRobot pricing
Tessary
- Open Source$0Self-host with Docker Compose; all core features
- Cloud Free$010k traces/mo, 1 GB, 30-day retention, $10 one-time RCA credit
- PaidCustomCustom classifiers, managed dedicated instance, Slack support
UptimeRobot
- Free$050 monitors, 5-min checks, 1 status page; non-commercial
- Solo$10/mo$9/mo billed annually; 10 monitors, 60-sec checks
- Team$41/mo$35/mo billed annually; 100 monitors, 30-sec, 3 seats
- Scale$77/mo$65/mo billed annually; 200 monitors, 15-sec checks
- EnterpriseCustomFaster intervals, SLA, SOC 2 docs, dedicated CSM
Tessary · Key features
- Classifiers run on every production trace with no sampling
- Built-in checks for drift, tool errors, secret leaks and malformed output
- LLM triage groups real deviations into trackable cases
- Root-cause analysis over failing traces and your GitHub repository
- OTLP ingestion over HTTP and gRPC with OpenTelemetry gen_ai conventions
- PII redaction before traces are stored
Cons
- Very new project with a short track record
- Paid plan prices are not published
- Frustration classifier requires your own OpenRouter or TypeSafe key
UptimeRobot · Key features
- HTTP(S), keyword, ping and port monitors
- Heartbeat monitoring for cron jobs and background workers
- SSL certificate and domain expiry alerts
- DNS, UDP and API monitoring with multi-location checks
- Hosted status pages with white-label option on Team and above
- Incident management with login and notify-only seats
Cons
- Free plan no longer allowed for commercial sites
- No logs, APM or real user monitoring
- SMS and voice alerts consume separately bought credits
Tessary vs UptimeRobot: FAQ
Do Tessary and UptimeRobot have a free plan?
Yes, both Tessary and UptimeRobot have a free plan; paid plans add more usage and features.