Best Anomaly Detection Software in 2026
Updated
In short: ObservabilityOS is ranked #1 of 19 as of 4 October 2026, ahead of PyOD and Metaplane. The best-ranked option with a free plan is PyOD. The lowest first paid tier on this page is ManageEngine NetFlow Analyzer at $172/mo.
Unusual activity can be detected in different kinds of data and by different methods, so begin with what you need to monitor. ObservabilityOS, PyOD and Metaplane appear among the first entries. Compare supported data and detection method, then consider whether real-time detection and anomaly explanations are listed for the kind of review you need. Data retention and deployment options add operational context, while free-plan availability and paid-from pricing offer cost details. The ranking orders nineteen tools using these criteria; use the stated capabilities to compare how each entry approaches detection and where it may fit your monitoring setup.
19 anomaly detection software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Detection method | |
|---|---|---|---|---|---|---|---|---|
| 1 | ObservabilityOS | 7.4 | RecognisedAPIDocumented | $292,499/mo | Yes | 29 /mo | hybrid | View |
| 2 | PyOD | 7.4 | RecognisedAPIDocumented | Free | Yes | — | hybrid | View |
| 3 | Metaplane | 7.3 | RecognisedAPIDocumented | Free | Yes | — | machine-learning | View |
| 4 | Soda | 7.3 | RecognisedAPIDocumented | $750/mo | Yes | 750 /mo | — | View |
| 5 | Corelight Open NDR | 6.9 | RecognisedAPIDocumented | — | — | — | hybrid | View |
| 6 | Vectra AI Identity Threat Detection and Response | 6.8 | RecognisedAPIDocumented | — | — | — | — | View |
| 7 | Darktrace / EMAIL | 6.7 | RecognisedAPIDocumented | — | No | — | — | View |
| 8 | ExtraHop RevealX | 6.7 | RecognisedAPIDocumented | — | — | — | hybrid | View |
| 9 |  PySAD | 5.9 | RecognisedAPIDocumented | Free | Yes | — | hybrid | View |
| 10 | ManageEngine NetFlow Analyzer | 5.7 | RecognisedAPIDocumented | $172/mo | Yes | — | — | View |
| 11 | rrcf | 5.5 | RecognisedAPIDocumented | — | Yes | — | machine-learning | View |
| 12 | Securonix UEBA | 5.5 | RecognisedAPIDocumented | — | — | — | — | View |
| 13 | Anomalo | 5.1 | RecognisedAPIDocumented | — | — | — | machine-learning | View |
| 14 | Axomaly | 5.1 | RecognisedAPIDocumented | — | — | — | statistical | View |
| 15 |  OpenUBA | 5.1 | RecognisedAPIDocumented | — | — | — | hybrid | View |
| 16 | Anodot | 5.0 | RecognisedAPIDocumented | — | — | — | — | View |
| 17 |  Anomalib | 5.0 | RecognisedAPIDocumented | Free | — | — | machine-learning | View |
| 18 | Progress Flowmon | 4.9 | RecognisedAPIDocumented | — | No | — | — | View |
| 19 | OpenSearch | 4.8 | RecognisedAPIDocumented | Free | — | — | — | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which anomaly detection software is ranked first on Inferse?
ObservabilityOS is ranked #1 of 19 with a score of 7.4. PyOD is second and Metaplane third.
How many of these have a free plan?
8 of the 19 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, ManageEngine NetFlow Analyzer has the lowest first paid tier we found: $172/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.