PagerDuty vs Tessary
PagerDuty and Tessary are both uptime & monitoring tools. PagerDuty is aimed at developers and enterprise, while Tessary is aimed at developers and small businesses. Both have a free plan.
On-call scheduling, alerting and incident response for ops teams
Open-source monitoring that finds why production AI agents fail
| Pricing | Freemium · $25 | Open source |
| Starting price | $25/mo | Not published |
| Free plan | Yes | Yes |
| Free trial | 14 days | — |
| Built for | Developers, Enterprise, Small businesses | Developers, Small businesses, Enterprise |
| Platforms | web, ios, android | web, linux |
| Country | US · 2009 | — |
| Rating | — | — |
Choose PagerDuty if
Engineering and IT operations teams that run critical production services and need proven on-call paging and incident coordination.
- Highly reliable paging, the industry reference for on-call
- Largest integration catalogue among incident tools
- Free plan is enough for very small teams
Look elsewhere if: Small teams wanting cheap, bundled uptime monitoring and paging (Better Stack, Grafana Cloud IRM).
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).
PagerDuty vs Tessary pricing
PagerDuty
- Free$0Up to 5 users, 1 schedule, 100 SMS/phone alerts a month
- Professional$25/user/mo$21/user/mo billed annually; post-incident reviews
- Starter (Platform)$2,800/yr10 seats, 5,000 events, 1,000 AI actions; billed upfront
- Essential (Platform)$12,000/yr20 seats, 40,000 events, 4,000 AI actions
- Plus (Platform)$48,000/yr50 seats, 150,000 events, 16,000 AI actions
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
PagerDuty · Key features
- On-call schedules, overrides and multi-level escalation policies
- Alert routing, grouping and deduplication from 700+ integrations
- Push, SMS, phone and email notifications with mobile acknowledgement
- Incident channels and actions inside Slack and Microsoft Teams
- Post-incident reviews and operational analytics
- AIOps add-on for event correlation and noise reduction
Cons
- Costs rise fast with AIOps, status pages and automation add-ons
- Packaging and plan names change often, making comparisons hard
- Platform tiers require annual upfront payment
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
PagerDuty vs Tessary: FAQ
Do PagerDuty and Tessary have a free plan?
Yes, both PagerDuty and Tessary have a free plan; paid plans add more usage and features.