Sub-2ms Pre-Filtered
Vector Search at Planet Scale.
MassEngine is a next-generation kNN vector database built from the ground up for multi-tenant AI & RAG systems. Eliminate selective-filter latency cliffs while cutting cluster memory footprints by 7×.
No Filter Cliffs. No Memory Bloat.
Evaluated on an identical 2-node replicated cluster (RF=2, 8 Shards, 2,000,000 × 1024-d English Wikipedia BAAI/bge-m3 embeddings, 10 concurrent clients). Select a filter selectivity below to compare throughput, latency, and memory:
Everything Modern RAG Needs in One Engine
Replace fragile multi-system pipelines with a single, deterministic search layer.
True Multi-Tenant Isolation
Host thousands of customer workspaces on shared infrastructure with zero noisy-neighbor degradation, scoped RBAC API keys, per-tenant QoS rate limits, and instant GDPR tenant purge.
High-Throughput Reads & Writes
Ingest over 72,000 vectors/sec with instant availability while sustaining up to 6,993 filtered QPS and sub-millisecond query latency under concurrent production load.
Rich Metadata Pre-Filtering
Filter on arbitrary JSON attributes using expressive operators ($eq, $ne, $gte, $lte, $in, $contains), date ranges, and category bitmaps with zero recall penalty.
In-Place Metadata Patching
Update document permissions, pricing, tags, or categories in place via PATCH without re-computing or re-uploading expensive high-dimensional embeddings.
Flexible Dimension Support
Native support for any embedding model dimension—from compact 128-d and 384-d models up to 1536-d and 3072-d frontier embeddings.
1-Click AWS & GCP Clusters
Start free with a 1-Core Developer License (up to 1M vectors), or purchase a signed Ed25519 per-core license (meli_...) and launch a multi-node HA cluster directly inside your own AWS or GCP VPC in 1 click.
Clean REST & SDK Interface
Simple, predictable JSON APIs and typed SDKs for Go, Python, and TypeScript.
POST https://api.massengine.com/v1/search
Authorization: Bearer mk_live_9f8a7b6c...
Content-Type: application/json
{
"vector": [0.021, -0.044, 0.089, "... 1024 dims"],
"k": 10,
"nprobe": 16,
"rerank_pool": 64,
"min_score": 0.75,
"metadata_filter": {
"department": { "$in": ["security", "legal"] },
"clearance_level": { "$gte": 2 },
"tags": { "$contains": "approved" }
}
}
Same 20M Records. 3 Live Hardware Setups.
See how MassEngine serves the exact same 20,000,000 English Wikipedia passages (1024-d embeddings, 83.46 GiB logical corpus across 8 shards) across three distinct live hardware profiles with 100% Top-K recall parity.
2-Node High-End In-Memory
All 8 shards (RF=2) pinned in high-bandwidth RAM for ultra-low tail latency under heavy concurrent load.
2-Node High-End NVMe
Identical 20M-record dataset served on a strict memory cap with zero-copy mmap NVMe segment tiering.
4-Node Low-End NVMe
20,000,000 vectors distributed across 4 lightweight nodes (1 vCPU / 6.8 GiB RAM each) backed by NVMe storage.
1-Core Free Forever. Scale on Your Own AWS, GCP, or Bare-Metal Instances.
Deploy MassEngine on your choice of instance type and cluster size in AWS, Google Cloud, Azure, or Bare-Metal Linux with an Ed25519-signed per-core license key (meli_...)—with 2 TB of NVMe storage included per licensed vCPU and zero cloud data markup. Testing or prototyping? Your first core is free forever.
1-Core Developer — $0 / mo
Instant activation in the Cloud Console or 1-Click launch on an AWS/GCP Free Tier VM. Ideal for development, evaluation, and workloads up to 1,000,000 vectors.
Production Cluster — $99 / vCPU / mo
Purchase a signed Ed25519 per-core license key (meli_...) in seconds via Square Checkout and bring up a multi-node RF=2 HA cluster in your own AWS, GCP, or bare-metal environment in 1 click.
i4i, c7i), GCE (c3d, n2d), or Bare Metal
meli_...)
Enterprise Fleet — $69 / vCPU / mo
Automatic 30% volume discount for 128+ vCPU deployments, multi-region replication, and air-gapped VPCs using Ed25519-signed offline license keys (meli_...).
meli_...)
Contact Enterprise Engineering
Planning an In-VPC deployment or 100M+ vector cluster? Reach out below—or create a self-service Cloud Console account to start immediately.