Arize Phoenix vs HoneyHive
Both are observability & tracing tools. Here is how they actually differ on price, billing model and deployment.
Arize Phoenix
The default open-source choice for LLM tracing and eval - runs locally in under a minute, built on OpenTelemetry. The catch is the license - the server is Elastic License 2.0, source-available, not OSI open source.
HoneyHive
An OpenTelemetry-based observability and evaluation platform aimed squarely at production AI agents at enterprise scale. Strong free developer tier, then a wall - everything above it is contact-sales with no published rate card.
| Arize Phoenix | HoneyHive | |
|---|---|---|
| Category | Observability & Tracing | Observability & Tracing |
| Our rating | 4/5 | 4/5 |
| Starting price | $0 | Custom (contact sales) |
| Billing meter | No usage metering | event |
| Free plan | Yes | Yes |
| Free self-hosting | Yes, free | No or paid tier only |
| Best for | Teams that want fast, framework-agnostic OSS tracing and strong RAG eval, and who are not reselling Phoenix as a hosted service | Teams running agent-heavy production workloads who want tracing, online evaluation, annotation and experiments in one agent-focused system, and who are comfortable with an enterprise sales process rather than self-serve pricing. |
Our verdict on Arize Phoenix
The default open-source pick for good reasons - it starts in under a minute, the RAG eval is the best around, and it is built on OpenTelemetry so you are not locked to one framework. Just read the license before you build a business on it. The server is Elastic License 2.0, source-available rather than OSI open source, which only bites if you plan to offer Phoenix as a service - but it is not what "fully open source" implies.
Full Arize Phoenix review →Our verdict on HoneyHive
HoneyHive is a genuinely good agent observability platform with a commercial model that will filter out half its potential users before they try it. The product is strong where it counts for agents - OpenTelemetry-based tracing with session replay and multi-agent filtering, and evaluators that run automatically against live production traces rather than only offline datasets. That last capability is the one most tools leave undone, and combined with drift detection, regression alerting and CI/CD integration it forms a coherent quality loop. The free developer tier is honest, giving full features at 10,000 events a month. Above that, there is no published pricing of any kind. Everything is custom and contact-sales. For an enterprise buyer that is normal. For a team trying to compare five platforms on cost before committing engineering time, it is a wall, and it means you cannot know whether HoneyHive is competitive without entering a sales cycle.
Full HoneyHive review →Frequently Asked Questions
What is the main difference between Arize Phoenix and HoneyHive?
Arize Phoenix: Teams that want fast, framework-agnostic OSS tracing and strong RAG eval, and who are not reselling Phoenix as a hosted service HoneyHive: Teams running agent-heavy production workloads who want tracing, online evaluation, annotation and experiments in one agent-focused system, and who are comfortable with an enterprise sales process rather than self-serve pricing. Both sit in Observability & Tracing, so the decision usually comes down to billing model and deployment rather than raw capability.
Which is cheaper, Arize Phoenix or HoneyHive?
It depends entirely on your workload shape, because they meter differently - Arize Phoenix bills on no usage metering and HoneyHive bills on event. Published starting prices are $0 and Custom (contact sales) respectively, but those numbers are not comparable until you apply them to the same traffic. Use our cost calculator to model both against your own request volume and span count.
Can I self-host Arize Phoenix or HoneyHive?
Arize Phoenix: Yes, free. HoneyHive: No or paid tier only. Free self-hosting means no licence fee, not no cost - you still own the infrastructure, upgrades and on-call.