Sentry vs Tessary
Sentry and Tessary are both uptime & monitoring tools. Sentry is aimed at developers, while Tessary is aimed at developers and small businesses. Both have a free plan.
Error and performance monitoring
Open-source monitoring that finds why production AI agents fail
| Pricing | Freemium · $29 | Open source |
| Starting price | $29/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | 14 days | — |
| Built for | Developers | Developers, Small businesses, Enterprise |
| Platforms | web | web, linux |
| Country | US · 2012 | — |
| Rating | — | — |
Choose Sentry if
Engineering teams of any size that want to know when and why code breaks.
- Best developer experience for debugging errors
- SDKs for everything
- Free tier for individuals
Look elsewhere if: Infrastructure metrics and logs at scale (Datadog, Grafana).
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).
Sentry vs Tessary pricing
Sentry
- Developer$01 user, 5k errors, 5 GB logs
- Team$29/mo$26/mo billed annually; unlimited users, 50k errors
- Business$89/mo$80/mo billed annually; 50k errors, 90-day lookback
- EnterpriseCustomCustom quotas and support
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
Sentry · Key features
- Error tracking with stack traces, breadcrumbs and release tracking
- Performance tracing and profiling
- Session Replay tied to errors
- Cron and uptime monitoring
- Seer AI for root cause and fix suggestions
- Suspect commits, issue ownership and alerting rules
Cons
- Costs scale with event volume; sampling needed
- Self-hosting is heavy
- Alert noise without tuning
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
Sentry vs Tessary: FAQ
Do Sentry and Tessary have a free plan?
Yes, both Sentry and Tessary have a free plan; paid plans add more usage and features.
Which is better for small businesses, Sentry or Tessary?
Tessary lists small businesses as a core audience, while Sentry is aimed more at developers.