Best Anomaly Detection Software in 2026
Updated
In short: PyOD is ranked #1 of 19 as of 4 October 2026, ahead of ManageEngine NetFlow Analyzer and OpenSearch. The best-ranked option with a free plan is ManageEngine NetFlow Analyzer. The lowest first paid tier on this page is ManageEngine NetFlow Analyzer at $172/mo.
When unusual patterns matter, start by checking what data each anomaly detection option supports and how it identifies deviations. The entries are ranked and compared on detection method, real-time detection, anomaly explanations, and data retention. Deployment options, free-plan availability, and paid-from pricing add practical considerations. PyOD leads the ranking, followed by ManageEngine NetFlow Analyzer and PySAD. Soda, Metaplane, ObservabilityOS, Corelight Open NDR, and Securonix UEBA also appear among the early entries. Use the listed criteria to compare data coverage and detection capabilities with your monitoring needs, then weigh deployment and cost details.
19 anomaly detection software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 PyOD Top pick · 7.3 Free plan · Free #2 ManageEngine NetFlow Analyzer Runner-up · 7.1 Free plan · $172/mo #3 OpenSearch Also great · 7.1 Free plan · Free
- Free plan apiLinuxmacOSself-hostedWindows
- Free plan
- Yes
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- tabular, time series, graph, text, image, audio
- Deployment options
- self-hosted
RecognisedDocumentedFree planPlatformsFree About PyODVisit site - Free plan AndroidiOSLinuxWebWindows
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms$172/mofirst paid tier About ManageEngine NetFlow AnalyzerVisit site - Free plan apiLinuxmacOSself-hostedWebWindowsRecognisedDocumentedFree planPlatforms
- Free plan LinuxmacOSWindows
- Free plan
- Yes
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- univariate data; multivariate data; streaming data
- Deployment options
- self-hosted
RecognisedDocumentedFree planPlatforms - Free plan Linuxself-hostedWebWindows
- Detection method
- machine-learning
- Supported data
- images, videos
- Deployment options
- self-hosted
RecognisedDocumentedFree planPlatforms - Free plan apiLinuxself-hostedWeb
- Free plan
- Yes
- Paid from
- 750 /mo
RecognisedDocumentedFree planPlatforms$750/mofirst paid tier About SodaVisit site - Free planFree trial apiWeb
- Free plan
- Yes
- Detection method
- machine-learning
- Real-time detection
- Yes
- Supported data
- row counts, freshness, schemas, column counts, cardinality, uniqueness, nullness, numeric statistics, custom SQL
- Deployment options
- cloud
RecognisedDocumentedFree planPlatforms - Free plan apiself-hostedWeb
- Free plan
- Yes
- Paid from
- 29 /mo
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- logs, metrics, traces
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms$292,499/mofirst paid tier About ObservabilityOSVisit site - Free plan apiWeb
- Detection method
- statistical
- Supported data
- Timestamped time-series values, optional metadata, business metrics, operational metrics, application metrics
- Deployment options
- cloud
RecognisedDocumentedFree planPlatforms - apiLinuxself-hostedWeb
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- network traffic, packet data, flow logs, cloud network traffic, protocol logs, files
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms - Web
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms - Free trial apiWebRecognisedDocumentedFree planPlatforms
- Free trial apiLinuxself-hostedWeb
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- network packets, applications, transactions, devices, users, identities, services, and network metadata
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms - apiWeb
- Free plan
- No
RecognisedDocumentedFree planPlatforms - Web
- Detection method
- machine-learning
- Supported data
- structured, semi-structured, unstructured, tables, documents
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms - Web
- Detection method
- hybrid
- Real-time detection
- Yes
- Supported data
- Elasticsearch, Apache Spark, CSV
- Deployment options
- self-hosted
RecognisedDocumentedFree planPlatforms -
- Free plan
- Yes
- Detection method
- machine-learning
- Real-time detection
- Yes
- Supported data
- multidimensional numerical and streaming time-series data
- Deployment options
- self-hosted
RecognisedDocumentedFree planPlatforms - Web
- Deployment options
- cloud
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- No
- Deployment options
- hybrid
RecognisedDocumentedFree planPlatforms
Is your app 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 Everything Xiaomi?
PyOD is ranked #1 of 19 with a score of 7.3. ManageEngine NetFlow Analyzer is second and OpenSearch third.
How many of these have a free plan?
9 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: documentation depth, a free tier and the platforms it runs on. Paid placements never change a rank.