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Comparison · Comms
Apache RocketMQ vs Synapse
A side-by-side editorial comparison of Apache RocketMQ and Synapse — release velocity, themes, recent moves, and the top alternatives to consider.
Apache RocketMQ vs Synapse: at a glance
What is Apache RocketMQ?
The RocksDB migration reaches native code as the legacy DLedger broker mode is marked for removal
The 5.x line continues to replace storage internals with RocksDB and to retire the mechanisms it supersedes. 5.5.1, the first release since April, swaps the pure-Java ConsumeQueue compaction filter for a native RocksDB CqCompactionFilter behind a cross-platform JNI shim, drops the shaded rocketmq-rocksdb dependency, and deprecates the legacy Broker DLedger mode. Lite Mode, introduced in 5.5.0, received stability work rather than the client-side adoption path it still needs. Alongside this sit fastjson 1.x removal and a long list of Proxy, Pop and Remoting fixes.
What is Synapse?
Synapse 1.164 advertises Matrix v1.16 and v1.17 amid a run of dependency security patches
Synapse keeps its two-to-three-week cycle of candidates and stables. 1.164.0 went stable on 27 October with support for Matrix v1.16 and v1.17 and a dedicated endpoint for scheduling delayed events (MSC4140). The surrounding releases are security dependency bumps: certifi, a rustls-webpki update that distrusts the compromised eMudhra intermediate CAs, Pillow 13.0.0 for critical image-handling flaws, and msgpack against memory exhaustion on the public room list.
Apache RocketMQ vs Synapse: editorial side-by-side
Apache RocketMQ
2.5COMMS
The RocksDB migration reaches native code as the legacy DLedger broker mode is marked for removal
◆ Current state
The 5.x line continues to replace storage internals with RocksDB and to retire the mechanisms it supersedes. 5.5.1, the first release since April, swaps the pure-Java ConsumeQueue compaction filter for a native RocksDB CqCompactionFilter behind a cross-platform JNI shim, drops the shaded rocketmq-rocksdb dependency, and deprecates the legacy Broker DLedger mode. Lite Mode, introduced in 5.5.0, received stability work rather than the client-side adoption path it still needs. Alongside this sit fastjson 1.x removal and a long list of Proxy, Pop and Remoting fixes.
◆ Where it's heading
The storage convergence is now deep enough to cross the JNI boundary — RocksDB is no longer an alternate index but the substrate, and the project is willing to take on native build complexity across platforms to get its performance. In parallel, deprecating legacy Broker DLedger narrows the replication story toward the jRaft controller, cutting a maintenance branch rather than carrying both. Lite Mode remains the open bet: it is being maintained but not yet extended outward to clients.
◆ Prediction
With legacy DLedger deprecated rather than removed, a following release that deletes it outright is the natural next step. Whether Lite Mode gains the client and proxy support it needs is still unresolved — 5.5.1 fixed it without broadening it.
Synapse
5.0COMMS
Synapse 1.164 advertises Matrix v1.16 and v1.17 amid a run of dependency security patches
◆ Current state
Synapse keeps its two-to-three-week cycle of candidates and stables. 1.164.0 went stable on 27 October with support for Matrix v1.16 and v1.17 and a dedicated endpoint for scheduling delayed events (MSC4140). The surrounding releases are security dependency bumps: certifi, a rustls-webpki update that distrusts the compromised eMudhra intermediate CAs, Pillow 13.0.0 for critical image-handling flaws, and msgpack against memory exhaustion on the public room list.
◆ Where it's heading
The homeserver tracks the spec closely, stabilising MSCs as they land in Matrix releases, while backporting each security bump to the previous stable line. Sticky Events and User Status work suggest continued alignment with newer client features.
◆ Prediction
1.165 release candidates should follow within about two weeks, likely with further MSC stabilisations.
Alternatives to Apache RocketMQ and Synapse
Other Comms products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Apache RocketMQ or Synapse.
VerneMQ
VerneMQ follows its year-in-the-making 2.2.0 with a quick round of subscription fixes.
Session
Session survived its funding scare; now Pro is on hold and Protocol v2 is the bet.
Misskey
Misskey moves to Sentry v11 and keeps shipping security fixes in its monthly releases.
Apprise
Apprise 2 is out: notify() returns a result object, and 2.1 takes the catalog to 170 services.
RSS.com
RSS.com's changelog is back after ten months, with listener voicemail for podcasts.
See all Apache RocketMQ alternatives → · See all Synapse alternatives →
Recent activity from Apache RocketMQ and Synapse
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 5d agoSynapseSynapse 1.164.1: msgpack memory-exhaustion fix, status clearing
- 6d agoSynapseSynapse 1.164.0: Matrix v1.16/v1.17 support goes stable
- 9d agoSynapseSynapse 1.164.0rc3: Pillow 13 security bump
- 9d agoSynapseSynapse 1.163.2: Pillow critical security backport
- 10d agoSynapseSynapse 1.164.0rc2: certificate trust updates
- 11d agoSynapseSynapse 1.163.1: eMudhra CA distrust and certifi update
- 2mo agoApache RocketMQ5.5.1: native RocksDB compaction filter, legacy DLedger mode deprecated
- 6mo agoApache RocketMQ5.5.0 adds Lite Mode, a lightweight subscription path for AI workloads ⚡
- 10mo agoApache RocketMQ5.4.0: priority messages and RocksDB-backed timer, transaction and index
- 10mo agoApache RocketMQ5.3.4: TimerWheel snapshots and Netty, OpenTelemetry upgrades
- 1y agoApache RocketMQ5.3.3 drops ACL 1.0 in favour of ACL 2.0
- 1y agoApache RocketMQ5.3.2: RocksDB-based Pop consumption enters alpha
Frequently asked questions
What is the difference between Apache RocketMQ and Synapse?
They serve adjacent needs but don't currently overlap on shipped themes. Synapse is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Apache RocketMQ better than Synapse?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Synapse is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to Apache RocketMQ?
Top Apache RocketMQ alternatives in Comms are ranked by recent ship velocity. Browse the "Apache RocketMQ alternatives" section above for the current picks, or visit /alternatives/rocketmq for the full list with editorial commentary on each.
What are the best alternatives to Synapse?
Top Synapse alternatives in Comms are ranked by recent ship velocity. Browse the "Synapse alternatives" section above for the current picks, or visit /alternatives/synapse for the full list with editorial commentary on each.