Side by side
Arthur vs Pulsar
Both stand on machine learning model monitoring software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APISelf-hostedWeb
Arthur combines agent discovery, observability, and policy controls with hosted, on-premises, and hybrid deployment choices. The Free plan has defined use-case, project, and retention limits; Enterprise pricing requires a custom quote.
Visit Arthur Free plan APISelf-hosted
Choose Pulsar if you need a free, open-source option for monitoring production model drift and performance, with alerts and Grafana visualisation. It is best suited to teams able to deploy and integrate a self-hosted service; its listed current database integration is InfluxDB.
Visit PulsarThe facts
| Arthur | Pulsar | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Self-hosted, Web | API, Self-hosted |
| Lowest paid plan | Premium: $60 a month | Not published |
| Plans published | 3 | None |
| Maker | Not published | Not published |
| Website | arthur.ai | pulsar.ml |
| On machine learning model monitoring software | #6 of 20 | #12 of 20 |
Arthur: what it does well
- Monitors agent activity across several discovery sources.
- Traces tool calls, context, costs, and latency.
- Provides real-time policy verdicts for listed risks.
- Hosted, on-premises, and hybrid deployments are available.
- Free plan includes up to 4 use cases.
What to know first
- Free plan retains data for 7 days.
- Free plan is limited to 2 projects.
- Premium is $60 a month.
- Enterprise pricing is custom.
Pulsar: what it does well
- Free, open-source community edition.
- Supports historical and real-time model input and output data.
- Tracks drift and performance against training data.
- Can alert when performance metrics reach thresholds.
- Includes a Grafana dashboard for user-defined features and time ranges.
What to know first
- Self-hosted deployment requires integration into a user's machine.
- The current time series database integration is InfluxDB.
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