Kolmos is a cloud database engine built for PostgreSQL, MySQL, and MongoDB workloads. It combines self-compressing storage, columnar architecture, and multi-wire compatibility to reduce database storage and cloud infrastructure costs.

Which database wire protocols does Kolmos support?

Kolmos natively supports PostgreSQL (port 5432), MySQL (port 3306), and MongoDB (port 27017) wire protocols. Standard drivers, ORMs (Prisma, Drizzle, SQLAlchemy, Hibernate), and database clients connect seamlessly with zero application code changes.

How does Kolmos reduce cloud database storage costs?

Kolmos uses an autonomous Explanation Ladder that mines Minimum Description Length (MDL) formulas and prototype clusters to compress data 1.66×–2.12× smaller than Parquet-zstd. It stores files directly on Cloudflare R2 object storage ($0.015/GB/mo) with zero data egress fees, cutting overall cloud database storage bills by 10× to 40×.

Is Kolmos data recovery 100% lossless?

Yes. Kolmos guarantees 100% mathematical fidelity via Invariant #1: decode(encode(x)) == x across all SQL and BSON data types. Every row decodes bit-perfectly with zero precision drift.

How does Kolmos execute fast analytical queries on cloud object storage?

Kolmos embeds min/max statistics and Bloom filters into segment headers. Using Apache DataFusion vectorized execution and predicate pushdown, the engine prunes irrelevant segments and streams zero-copy Apache Arrow memory buffers without downloading unneeded data.

What prevents vendor lock-in with Kolmos storage formats?

Every Kolmos segment footer pins an open, self-contained WASM decoder covenant executed in an isolated Wasmtime sandbox. This guarantees your database files remain readable perpetually decades later without requiring proprietary server runtimes.

MongoDB-Compatible · PostgreSQL · MySQL Wire DBaaS

Predictable Database Pricing.
Zero Bandwidth Egress Fees.

One unified database engine for MongoDB, PostgreSQL, and MySQL. Store directly to Cloudflare R2 with CAS columnar compression and cut cloud database bills by up to 88%.

Free Forever

Community

For solo developers, students, and prototype projects.

$0/ month

No credit card required

Storage

5 GB Included

Protocols

Mongo · Postgres · MySQL

Egress

$0.00 / Free

Connections

Up to 20 concurrent

5 GB CAS Storage

Equivalent to ~15-20 GB uncompressed database data

Included Features:

Up to 3 Active Database Stores

MongoDB Wire (:27018) & Postgres Wire (:5433)

Zero Inactivity Pausing (Never sleeps 24/7)

Daily automated storage compaction

Public Cloud Query Studio & Explorer

Community Discord Support

Start Building Free

Instant provisioning in < 2 seconds

Pro Developer

Scale Cloud

High Availability

For high-traffic production workloads, fintech, and analytics.

$99/ month

Billed monthly

Storage

500 GB ($0.03/GB overage)

Protocols

Mongo · Postgres · MySQL

Egress

$0.00 / Free

Connections

Up to 500 concurrent

500 GB CAS Storage Included

$0.03 / GB-month beyond included quota

Included Features:

High Availability Multi-Node Cluster

Instant Zero-Copy Database Branching

Automated Durable Snapshot Backups

Dedicated High-Memory Engine Allocation

Full Mongo, Postgres & MySQL Wire Endpoints

Continuous Auto-Compaction on Object Tier

Priority 24/7 Support & 99.9% Uptime SLA

Launch Scale Cluster

Instant provisioning in < 2 seconds

Custom Clusters & Enterprise

Need Dedicated Multi-Terabyte Clusters or Custom Quotas?

Looking for tailored storage volumes, custom connection capacities, dedicated high-memory allocations, or migration support from MongoDB Atlas or AWS RDS? Talk directly with our database engineering team.

Talk to Engineering

Full Capabilities Breakdown

Compare Plan Capabilities

A comprehensive technical breakdown of all features across Kolmos Cloud tiers.

Feature & Specification	Free Forever $0 / mo	Pro Developer $19 / mo	Scale Cloud $99 / mo
Database Engine & Wire Protocols
MongoDB Wire Protocol (:27018) Full compatibility with Mongoose, mongosh, Mongo Compass & native drivers
PostgreSQL Wire Protocol (:5433) Drop-in compatibility with psql, Prisma, Drizzle, DBeaver, Django & TypeORM
MySQL Wire Protocol (:3306) Standard MySQL client and library support
Active Database Stores (Clusters) Isolated storage instances with independent WAL streams	Up to 3	Unlimited	Unlimited
Zero-Copy Instant Branching Fast database branch creation for dev/staging environments without storage duplication		Up to 5 branches	Unlimited
Storage Architecture & Bandwidth
Included CAS Storage Compressed Content-Addressable Storage (CAS) on Cloudflare R2	5 GB CAS (~20GB raw)	50 GB CAS (~200GB raw)	500 GB CAS (~2TB raw)
Storage Overage Rate Predictable cost per compressed GB beyond included tier	N/A (Capped)	$0.04 / GB-mo	$0.03 / GB-mo
Data Egress Transfer Fees Zero bandwidth markup for external query reads or exports	$0 Free	$0 Free	$0 Free
Columnar Compression Engine 1.6×–2.1× smaller footprint than raw database tables
Automated Compaction & Garbage Collection Compaction daemon merges small segments without write locking	Daily	Continuous	Continuous + Priority
Performance & Reliability
Zero Inactivity Pausing (Never Sleeps) Sub-millisecond cold start on object storage — databases are always live 24/7
Concurrent Connections Limit Simultaneous active TCP client sessions	Up to 20	Up to 100	Up to 500+
Multi-Node High Availability (HA) Replicated cluster consensus and automatic failover		Single-node Cloud	Multi-node HA Cluster
Dedicated High-Memory Engine Dedicated caching memory for write buffering and index hot-paths	Shared	Standard Caching	Dedicated High-Memory
Security & Backups
TLS In-Transit Encryption Encrypted wire protocol connections (:27018, :5433, :3306)
Automated Snapshot Backups Automated durable snapshots stored on separate object tiers	Manual	7-Day Automated	30-Day Automated
Bit-Exact Decode Verification WebAssembly (WASM) covenant sandbox verifies 100% bit-exact parity
Management, Tooling & Support
Public Cloud Control Plane & Query Studio Web-based SQL and MongoDB document editor with schema exploration
Live Metrics & Query Logs Real-time read/write throughput and latency telemetry	Basic	Full Telemetry	Full + Log Retention
Support Channels Direct access to database engineers and support	Community Discord	Priority Email (24h SLA)	Private Priority SLA
Guaranteed Uptime SLA Service level agreement credit guarantee	Best-effort	99.9%	99.95%

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Real Workload Cost Breakdown

How Kolmos Saves 75% to 88% on Cloud Bills

Comparing equivalent compute, RAM, storage, and egress bills between traditional cloud databases and Kolmos Cloud.

Workload & Scale	Traditional Stack (Atlas / RDS)	Kolmos Cloud	Your Savings
Small Startup (50 GB Data) 1 Active Database (Mongo or Postgres), 100 GB monthly egress	$76 / mo MongoDB Atlas M10 / AWS RDS $57 compute + $10 storage + $9 AWS egress	$19 / mo Pro Tier (50GB included + $0 Free Egress)	75% Cheaper Save $57/mo ($684/yr)
Growing SaaS App (250 GB Data) Production App + Read Replicas, 350 GB egress, high writes	$235 / mo MongoDB Atlas M20 / RDS db.r6g $140 compute + $60 EBS + $35 egress	$27 / mo $19 base + 200GB overage ($8) + $0 egress	88.5% Cheaper Save $208/mo ($2,496/yr)
Multi-Stack Scale (1 TB Data) Documents (Mongo) + Relational (Postgres) + Analytics	$1,000 / mo Atlas ($350) + RDS ($250) + Warehouse ($400) 3 separate database bills + complex ETL sync	$114 / mo Scale Tier ($99) + 500GB extra ($15) on R2	88.6% Cheaper Save $886/mo ($10,632/yr)

CAS Columnar Compression100GB of raw JSON/rows compresses into ~30–35GB of CAS segments (1.6x–2.1x smaller than Parquet).

Zero EBS Disk MarkupsStored directly to Cloudflare R2 at $0.015/GB instead of AWS EBS SSD drives at $0.115–$0.25/GB.

$0 Zero Egress FeesCloudflare R2 charges $0 for data egress, eliminating AWS's notorious $0.09/GB transfer tax.

Frequently Asked Questions

Everything you need to know about Kolmos Cloud billing & architecture

Predictable Database Pricing. Zero Bandwidth Egress Fees.