Polylane vs Tessary
Polylane and Tessary are both uptime & monitoring tools aimed at developers and small businesses. Both have a free plan.
AI on-call engineer that investigates and fixes production issues
Open-source monitoring that finds why production AI agents fail
| Pricing | Freemium · $80 | Open source |
| Starting price | $80/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Small businesses, Enterprise | Developers, Small businesses, Enterprise |
| Platforms | web, macos, linux | web, linux |
| Country | US · 2025 | — |
| Rating | — | — |
Choose Polylane if
Small platform and backend teams running on Cloudflare, Vercel or AWS who want an AI first responder without hiring an SRE.
- Free plan for two members and two cloud accounts
- Read-only Cloudflare access with no full-access option offered
- MCP and API reads are unlimited on every plan
Look elsewhere if: Teams that need a mature, full observability suite with predictable usage pricing (Datadog, Sentry).
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).
Polylane vs Tessary pricing
Polylane
- Free$02 members, 2 cloud accounts, 10 impact assessments/mo
- Starter$80/moUnlimited seats, 5 cloud accounts; $64/mo billed annually
- Team$200/moUnlimited cloud accounts, shared memories; 20% off yearly
- Business$500/mo100x credits, 5,000 impact assessments; 20% off yearly
- Scale$800/mo160x credits, pay-as-you-go overage; 20% off yearly
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
Polylane · Key features
- Context graph linking code, infrastructure and telemetry
- Anomaly and issue detection from metrics, logs and traces
- Root-cause investigations as a transcript you can watch, interrupt and share
- Impact analysis of pull requests against production
- Autofix that opens pull requests in GitHub
- Cloudflare connection with a single read-only token
Cons
- Credits are relative multiples, so monthly cost is hard to predict
- Steep jump from free to the $80 Starter plan
- Product is still described as early access
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
Polylane vs Tessary: FAQ
Do Polylane and Tessary have a free plan?
Yes, both Polylane and Tessary have a free plan; paid plans add more usage and features.