Telemetry.dev Review 2026
OpenTelemetry-native observability for AI and LLM apps: every model call, tool step, and retrieval in one trace with tokens, cost, latency, and errors.
What Makes Telemetry.dev Unique
AI-native observability built on OpenTelemetry, so you can see exactly what your agent did, what it cost, and where it failed.
What is Telemetry.dev?
Telemetry.dev answers the question every LLM developer hits eventually: "Why did my agent do that, and what did it cost?" Each model call, tool step, and retrieval shows up in one trace with tokens, cost, latency, and errors attached. It is built on OpenTelemetry, so it works with whatever framework you already use instead of forcing you into a proprietary agent runtime.
The free tier is enough to monitor a side project, and the founding Pro price of $25 a month is reasonable for a small team. The tradeoff is that you have to instrument your app; observability is not magic. The dashboards are useful, but the real value is in the traces when something breaks.
If you are shipping an AI app in production, this is the kind of tool you add before you need it.
Pricing checked September 4, 2026.
Key Features
- ✓Every model call, tool step, and retrieval in one trace
- ✓Tokens, cost, latency, and errors attached to each span
- ✓OpenTelemetry-native: any framework, any language
- ✓Volume, cost, p95 latency, and error rate dashboards
- ✓No lock-in; exportable data
Pros & Cons
✓ Pros
- +The 'stop guessing' answer for AI apps
- +OpenTelemetry-native means it fits existing infrastructure
- +Generous free tier for a side project
✗ Cons
- −Early-stage product; integrations will grow over time
- −Requires adding instrumentation to your app
- −Ingestion units can add up at high volume
Frequently Asked Questions
What is Telemetry.dev?
OpenTelemetry-native observability for AI and LLM apps: every model call, tool step, and retrieval in one trace with tokens, cost, latency, and errors.
How much does Telemetry.dev cost?
Free: 10,000 ingestion units/month, 7-day retention, 1 project, 2 seats. Pro: founding price $25/mo (then $50/mo), 250k units, 30-day retention, 5 projects, 5 seats. Pricing checked September 4, 2026.
Who is Telemetry.dev best for?
Developers building LLM apps or agents who need traces for debugging, cost tracking, and reliability.
Who Is It Best For?
Developers building LLM apps or agents who need traces for debugging, cost tracking, and reliability.
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