Arize AX vs HoneyHive
Both are observability & tracing tools. Here is how they actually differ on price, billing model and deployment.
Arize AX
The commercial cloud product from the makers of Phoenix. The upgrade from free Phoenix is not a tier change - it is a repricing onto per-span billing, and online monitoring is the feature that forces it.
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 AX | HoneyHive | |
|---|---|---|
| Category | Observability & Tracing | Observability & Tracing |
| Our rating | 4/5 | 4/5 |
| Starting price | $50/mo | Custom (contact sales) |
| Billing meter | span | event |
| Free plan | Yes | Yes |
| Free self-hosting | No or paid tier only | No or paid tier only |
| Best for | Teams that outgrew self-hosted Phoenix and want the managed version without operating it, mixed ML and GenAI shops that need computer vision and model observability in the same platform, and regulated teams needing HIPAA. | 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 AX
Arize AX is the managed, production-grade half of a genuinely good two-product strategy, and the honest way to evaluate it is to understand what forces the move from free Phoenix. It is not scale, and it is not support. It is online monitoring. The open-source Phoenix build does not include online monitoring or online evaluations as part of its observability stack, so the moment you need to evaluate live production traffic rather than debug locally, you are buying AX. That is a defensible commercial line, and Arize is more upfront about it than most, but it means Phoenix is best understood as an excellent development and debugging tool rather than a complete production platform. AX itself is strong - genuinely mature ML and computer vision observability inherited from Arize's older business, online evals, and pricing that scales on spans rather than seats, which is unusually favourable for large teams. The catch is that per-span billing punishes agent workloads, and the jump from $50 a month to a reported median Enterprise spend near $60,000 a year is a cliff with nothing published in between.
Full Arize AX 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 AX and HoneyHive?
Arize AX: Teams that outgrew self-hosted Phoenix and want the managed version without operating it, mixed ML and GenAI shops that need computer vision and model observability in the same platform, and regulated teams needing HIPAA. 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 AX or HoneyHive?
It depends entirely on your workload shape, because they meter differently - Arize AX bills on span and HoneyHive bills on event. Published starting prices are $50/mo 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 AX or HoneyHive?
Arize AX: No or paid tier only. 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.