Developer Tools vs Tessary
Developer Tools and Tessary are both developer tools tools. Developer Tools is aimed at freelancers and small businesses, while Tessary is aimed at developers and small businesses. Both have a free plan.
Developer Tools
173 free web, DNS, SSL, SEO & developer tools — fast, live, no sign-up
Tessary
Open-source monitoring that finds why production AI agents fail
| Pricing | Free | Open source |
| Starting price | Not published | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Freelancers, Small businesses, Developers | Developers, Small businesses, Enterprise |
| Platforms | web, ios, android, macos, windows, linux | web, linux |
| Country | TR · 2015 | — |
| Rating | — | — |
Choose Developer Tools if
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).
Developer Tools vs Tessary pricing
Developer Tools
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
Developer Tools · Key features
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
Developer Tools vs Tessary: FAQ
Do Developer Tools and Tessary have a free plan?
Yes, both Developer Tools and Tessary have a free plan; paid plans add more usage and features.