Best Free Data Warehouses in 2026
12 free and open-source data warehouses ranked by community adoption, search interest, and review quality.
8 open-source · 4 freemium · Last verified March 25, 2026
Free Data Warehouses at a Glance
| # | Tool | Score | License | Paid Plans |
|---|---|---|---|---|
| 1 | PostgreSQL Advanced open-source relational database with extensibility, JSONB support, and strong SQL compliance. | 86 | Open Source | Self-host only |
| 2 | ClickHouse ClickHouse is a fast open-source column-oriented database management system that allows generating analytical data reports in real-time using SQL queries | 82 | Open Source | Self-host only |
| 3 | MongoDB Get your ideas to market faster with a flexible, AI-ready database. MongoDB makes working with data easy. | 80 | Freemium | Free |
| 4 | Elasticsearch Elasticsearch is the leading distributed, RESTful, open source search and analytics engine designed for speed, horizontal scalability, reliability, and easy management. Get started for free.... | 79 | Freemium | Free |
| 5 | DuckDB DuckDB is an in-process SQL OLAP database management system. Simple, feature-rich, fast & open source. | 74 | Open Source | Self-host only |
| 6 | InfluxDB The InfluxDB is a time series database from InfluxData headquartered in San Francisco. | 71 | Open Source | Self-host only |
| 7 | QuestDB QuestDB is a high performance, open-source, time-series database | 70 | Open Source | Self-host only |
| 8 | Neo4j Connect data as it's stored with Neo4j. Perform powerful, complex queries at scale and speed with our graph data platform. | 65 | Freemium | Free |
| 9 | Apache Druid Apache Druid is an open source distributed data store. | 62 | Open Source | Self-host only |
| 10 | TimescaleDB From the creators of TimescaleDB — the PostgreSQL platform trusted by enterprises processing trillions of metrics daily. Start a free trial or get a demo. | 62 | Freemium | Free |
| 11 | Delta Lake Open-source storage framework bringing ACID transactions, schema enforcement, and time travel to data lakes — originated at Databricks, widely adopted. | 57 | Open Source | Self-host only |
| 12 | Apache Pinot Real-time distributed OLAP datastore | 55 | Open Source | Self-host only |
Free & Open-Source Data Warehouses: What You Need to Know
Several cloud data warehouses offer meaningful free tiers that go beyond trial periods — enough to run analytics workloads for small teams or proof-of-concept projects without spending anything. Open-source alternatives like ClickHouse and DuckDB provide full warehouse capabilities with zero licensing cost, trading managed convenience for infrastructure control. The free tier landscape in data warehousing is particularly competitive, with major cloud providers using generous free offerings to attract teams that will eventually scale into paid plans.
What to Look For in Free Data Warehouses
Free warehouse tiers vary dramatically in what they include. Some limit compute credits (queries stop when credits run out), others limit storage, and some restrict concurrency or features like materialized views. For open-source warehouses, the "free" cost shifts to infrastructure and operations — running a production ClickHouse cluster requires meaningful engineering investment. Evaluate whether the free tier supports your actual query patterns and data volume, not just a demo workload.
All Free Data Warehouses
Advanced open-source relational database with extensibility, JSONB support, and strong SQL compliance.
ClickHouse is a fast open-source column-oriented database management system that allows generating analytical data reports in real-time using SQL queries
Get your ideas to market faster with a flexible, AI-ready database. MongoDB makes working with data easy.
Elasticsearch is the leading distributed, RESTful, open source search and analytics engine designed for speed, horizontal scalability, reliability, and easy management. Get started for free....
DuckDB is an in-process SQL OLAP database management system. Simple, feature-rich, fast & open source.
The InfluxDB is a time series database from InfluxData headquartered in San Francisco.
Connect data as it's stored with Neo4j. Perform powerful, complex queries at scale and speed with our graph data platform.
Apache Druid is an open source distributed data store.
From the creators of TimescaleDB — the PostgreSQL platform trusted by enterprises processing trillions of metrics daily. Start a free trial or get a demo.
Open-source storage framework bringing ACID transactions, schema enforcement, and time travel to data lakes — originated at Databricks, widely adopted.
Frequently Asked Questions
What is the best free data warehouses in 2026?
Based on our composite ranking, PostgreSQL ranks #1 among 12 free data warehouses with a score of 86. ClickHouse and MongoDB are also top-ranked free options. Rankings are recalculated regularly.
What is the difference between free and open-source data warehouses?
Open-source tools (PostgreSQL, ClickHouse, DuckDB) publish their source code and can be self-hosted with no licensing restrictions. Free/freemium tools offer no-cost tiers but may limit features, usage, or require a paid upgrade for production workloads. Freemium options like MongoDB and Elasticsearch provide free tiers with paid upgrades.
How are free data warehouses ranked?
We use the same composite scoring as our main rankings: community interest (50%), review quality (30%), and pricing accessibility (20%). All tools on this page score the full pricing accessibility bonus since they offer free access. No vendor pays for placement.