# Apache Pulsar

- **Canonical URI:** https://www.vioscale.ai/software/apache-pulsar
- **Category:** Message Queues
- **Homepage:** https://pulsar.apache.org
- **Also known as:** apache-pulsar
- **Profile claimed by vendor:** no
- **Last updated:** 2026-08-05T13:30:47.750Z

## Vioscale score

**63.4 / 100**, confidence 18% (low).

Composite of weighted, independently-sourced signals (no user reviews, no vendor payment).

| Signal | Score | Weight | Contribution | Evidence present |
|---|--:|--:|--:|:--:|
| price_level | 100 | 0.047 | 4.7 | ✓ |
| reliability | 0 | 0.175 | 0 | - |
| capabilities | 86.7 | 0.07 | 6.1 | ✓ |
| github_stars | 78.9 | 0.029 | 2.3 | ✓ |
| integrations | 56.5 | 0.094 | 5.3 | ✓ |
| github_activity | 58.8 | 0.105 | 6.2 | ✓ |
| release_cadence | 0 | 0.058 | 0 | - |
| security_posture | 0 | 0.129 | 0 | - |
| package_downloads | 0 | 0.152 | 0 | - |
| pricing_transparency | 25 | 0.07 | 1.8 | ✓ |
| stackoverflow_activity | 0 | 0.07 | 0 | - |

## Pricing

_As of 2026-08-05, [verify at source](https://pulsar.apache.org). Independently observed._

Open source · Free tier

## About

Apache Pulsar is an open-source, distributed messaging and streaming platform built for the cloud. It is an all-in-one platform supporting both individual message consumption and stream processing at scale with sub-10ms latency.

_Independently observed._

## Platform & deployment

- **Platforms:** CLI, Web
- **Deployment:** Cloud / SaaS, Self-hosted

## Integrations (50)

_Independently observed._

- Aerospike
- AWS Lambda
- AWS SQS
- Azure Data Explorer
- Azure DocumentDB
- Cassandra
- Couchbase
- Datadog
- Debezium
- DynamoDB
- Elasticsearch
- Flume
- Geode
- Google BigQuery
- Grafana
- HBase
- HDFS
- InfluxDB
- Kafka
- Kinesis
- Kinetica
- Kudu
- Logstash
- MarkLogic
- MongoDB
- MQTT
- Neo4j
- New Relic
- NiFi
- PostgreSQL
- Presto
- RabbitMQ
- Redis
- SAP HANA
- SingleStore
- Snowflake
- Solr
- Splunk
- Terraform
- XTDB
- Zeebe
- Canal
- CoAP
- File
- Function Mesh
- JMS
- Netty
- NSQ
- PLC4X
- RocketMQ

## Capabilities

_The capabilities that matter for Message Queues. "-" = undocumented, not absent._

| Capability | Supported |
|---|:--:|
| **Core** | |
| Messaging paradigm | Log / streaming |
| **Correctness** | |
| Delivery guarantee | Exactly-once |
| Ordering guarantee | Per-partition |
| **Durability** | |
| Durable replayable log | ✓ |
| Message replay / rewind | ✓ |
| **Interop** | |
| Wire protocol | Pulsar binary, Kafka (KoP), RabbitMQ, MQTT (MoP), AMQP |
| Kafka-protocol compatible | ✓ |
| **Scale** | |
| Partitioned horizontal scaling | ✓ |
| **Consumption** | |
| Consumer groups / competing consumers | ✓ |
| Dead-letter queue | - |
| **Scale** | |
| Geo / cross-region replication | ✓ |
| **Deployment** | |
| Managed cloud offering exists | - |
| Hosting | Cloud + self-hosted |
| **Processing** | |
| Built-in stream processing | ✓ |

## Facts

Every value below carries its source and our confidence. Facts are re-crawled on a freshness schedule.

### activity

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| activity.commits_last_30d | 73 | [link](https://github.com/apache/pulsar/pulse) | 2026-08-01 | 65% (medium) |

### adoption

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| adoption.github_stars | 15,300 | [link](https://github.com/apache/pulsar) | 2026-08-01 | 90% (high) |

### integrations

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| integrations.count | 91 | [link](https://pulsar.apache.org) | 2026-08-05 | 60% (medium) |

### language

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| language.primary | Java | [link](https://github.com/apache/pulsar) | 2026-08-01 | 90% (high) |

### license

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| license.spdx | Apache-2.0 | [link](https://github.com/apache/pulsar) | 2026-08-01 | 95% (high) |

### pricing

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| pricing.model | commercial | [link](https://pulsar.apache.org) | 2026-08-05 | 60% (medium) |
| pricing.price_level | free | [link](https://pulsar.apache.org) | 2026-08-05 | 60% (medium) |
| pricing.free_tier | yes | [link](https://pulsar.apache.org) | 2026-08-05 | 60% (medium) |

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*Source: Vioscale (https://www.vioscale.ai/software/apache-pulsar). Independent, evidence-based software intelligence. Cite the canonical URI.*