Apache Unomi

Apache Unomi is an open-source Java server for collecting customer, lead, and visitor information and turning it into personalized experiences. It is best suited to engineering-led organizations that want a self-hosted customer-data foundation they can integrate and extend. The trade-off is clear: you gain control and flexibility, but must build the user-facing layer around it.

Overview

Unomi associates incoming activity with progressively enriched profiles, giving teams a persistent basis for personalization and audience work. It is the reference implementation of the OASIS Customer Data Platform specification, which makes it a credible foundation for projects that need a standards-oriented CDP core rather than a finished marketing suite.

Elasticsearch provides storage, while HTTP REST requests and JSON make the service approachable from other applications. Documented uses include website personalization, mobile data collection, in-store beacon connections, and sending scored leads to a CRM. The architecture is described as highly scalable and intended to simplify external data integration, although operating a Java server and its storage remains an engineering responsibility.

Key features

Profiles, events, and activation

Unomi tracks users, links events to their profiles, and supports real-time profiles, identity resolution, streaming ingestion, and audience activation. This combination is useful when decisions must follow current behavior rather than periodic batch updates. Dynamic segments classify profiles into changing groups, so audiences can respond as attributes and activity evolve.

Rules and extensibility

The built-in rule engine can trigger actions when profile events are collected. Unomi runs as an OSGi application inside Apache Karaf and can be extended with plugins for conditions, actions, beacon tracking, and push notifications. That modular design suits teams with distinctive data flows or channels; it also means feature delivery depends on development and integration work instead of configuring a single packaged interface.

Privacy API

The privacy REST API lets integrators give users control over tracking, show collected data, anonymize records, and delete profile information. This is a substantial capability for products that need programmable privacy operations. Unomi does not provide a default privacy interface, however, so developers must expose those controls in their own web or application experiences.

Deployment and ecosystem

Docker images and a Java quick-start guide support deployment, and the project describes installation as unzip and run. Named integration targets include CMSs, CRMs, issue trackers, and native mobile applications. Release files come with PGP and SHA512 verification options, while vulnerability reports go through Apache's security process. Mailing lists, a monthly online meeting, Slack, and JIRA provide community channels rather than a paid support desk.

Pricing

There is no paid tier, free trial, or subscription renewal. The free plan gives organizations the complete open-source project, but it does not remove infrastructure, Elasticsearch, integration, or interface-development costs. It is the practical choice for teams able to operate self-hosted software; organizations budgeting for a vendor-managed service should look elsewhere.

Platforms

Unomi is available as an API and web service on Linux, with self-hosted deployment. Docker images and Java installation guidance support teams that control their runtime. It is not presented as a hosted SaaS product with managed operations.

Who it's for

Choose Unomi when developers need ownership of profile data, event pipelines, identity resolution, rules, and segments, or when a project must connect a CMS, CRM, mobile app, or beacon system. It is particularly appropriate for organizations willing to implement their own privacy screens and operational tooling. It is a weaker fit for marketers who need turnkey campaign screens, managed hosting, or a ready-made consent and data-access portal.

Pros and cons

Pros

• Open-source and free: Apache License v2 avoids per-seat or usage charges and permits self-hosted control.
• Strong data foundation: Profiles, event association, identity resolution, streaming ingestion, rules, and dynamic segments cover the core path from activity to audience.
• Extensible architecture: OSGi plugins and REST/JSON integration support custom conditions, actions, beacons, notifications, and external systems.
• Programmable privacy: The API supports review, anonymization, deletion, and tracking controls.

Cons

• No default privacy UI: Developers must build the screens that let users exercise the API's controls.
• Self-hosting overhead: Teams run the Java service and Elasticsearch and handle integration and operations themselves.
• Community-led support: Help is provided through project channels rather than a guaranteed commercial support package.

Alternatives

Customer Data Platforms is the broader category to browse when you want to compare hosted and self-managed approaches.

• Manago AI (formerly SALESmanago): pick it instead when you want a paid, trialable product on web, Android, and iOS.
• RudderStack Customer Data Platform: choose it for a freemium platform with a free-forever plan, 250,000 events per month, and broad destination connectivity.
• BlueConic: consider it for a free-access subscription with profile, volume, and usage limits.
• Lytics: choose it for a free personalization engine with native WordPress and Drupal integrations.
• Twilio Segment: pick it for a freemium service whose free plan includes 1,000 visitors per month and 700-plus integrations.
• Tracardi: consider it when an open-source CDP is preferred, accepting limits on events per second, tenancy, automation, and validation.
• Hightouch: choose it for a freemium sync-focused product with two active syncs on its free plan.
• Leadspace: pick it when lead-focused workflows and a free starter plan with one seat and daily credits fit better.

Verdict

Apache Unomi is a strong choice for engineering teams that want a free, extensible, self-hosted profile and event engine with rules, segments, and privacy APIs. Choose it for control and integration flexibility; look elsewhere if you need managed operations or a finished privacy and marketing interface.