This page's audience our own tag's counts — open to see them

Period

–Visits

–Page views

–Clicks to vendors

–Time on page

–Reading now

Clicks to vendors, by tool

Top countries

Devices

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

Blazer

Free#54 of 88 in Business Intelligence Tools

Blazer: A self-hosted, open-source BI tool for teams that prefer SQL-driven analytics. Ranked #54 of 88 in Business Intelligence Tools by our editors (3.9/10); pricing: Open source; best for SQL-savvy teams wanting open-source analytics.

3.9/10Editor score

Visit Blazer

Blazer3.9 Visit Blazer

At a glance

Editor score
3.9 / 10
Pricing
Open source
Best for
SQL-savvy teams wanting open-source analytics
Paid from
Free
Deployment
Self-hosted
Facts checked
20 Sep 2026

Where it wins
- SQL exploration with charts, dashboards, variables, and query auditing
- Data-quality checks with email alerts and Slack notifications
- Supports multiple database sources, including BigQuery and Redshift
Where it doesn't
- Self-hosted deployment requires a Rails application or Docker
- No AI or natural-language analytics features
- Governance, scheduling, and embedding features are not included

Our verdict on Blazer

Blazer is an open-source business intelligence tool for teams that want to explore connected databases with SQL. It runs as a mountable Rails engine or from a Docker image, making it a natural fit for organizations with an existing Ruby on Rails application and a preference for self-hosted analytics. Its core workflow covers SQL query exploration, automatic chart generation, multi-query dashboards, parameterized and smart variables, and query auditing.

Database compatibility is a central strength. Blazer supports sources including Amazon Athena, Amazon Redshift, Apache Spark, ClickHouse, Elasticsearch, Google BigQuery, MySQL and MariaDB, Neo4j, Cassandra, Druid, InfluxDB, and other listed systems. Teams can also upload CSV files into database tables, work across multiple database sources, and build cohorts, anomaly detection, and forecasting views. For ongoing data oversight, data-quality checks can send email alerts or Slack notifications, giving the platform a broader operational scope than a query-and-chart interface alone.

The trade-off is a focused, developer-oriented product rather than a full enterprise BI suite. Self-hosting places deployment and administration within the team’s environment, and the published capabilities do not include AI or natural-language analytics, governance, scheduling, or embedding. Blazer suits SQL-comfortable teams that value control, Rails integration, and an MIT-licensed open-source model. Organizations seeking managed delivery, embedded analytics, or guided analytics for non-SQL users should choose a product built around those needs instead.

Your product? Our editors can test Blazer in depth and publish a review, labelled as paid · from $149/mo →

Blazer pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on blazer.dokkuapp.com

Blazer fact sheet

Free plan	Not verified
Paid from	Free
Deployment	Self-hosted
Refresh frequency	Not verified
Row-level security	Not verified
Scheduled reports	Not verified
Viewer seats	Not verified
Embedded analytics	Not verified
Natural-language queries	Not verified
Deployment	Self-hosted
Platforms	Web
Support	Docs, Community
Built for	Small business, Mid-market, Enterprise (editorial estimate)
Integrations	20 integrations: Amazon Athena, Amazon Redshift, Apache Drill, Apache Hive, Apache Ignite, Apache Spark …
Pricing	Open source
Website	blazer.dokkuapp.com
Facts checked	20 Sep 2026

Blazer integrations

Blazer lists 20 integrations on its own site.

Amazon Athena
Amazon Redshift
Apache Drill
Apache Hive
Apache Ignite
Apache Spark
Cassandra
ClickHouse
Druid
Elasticsearch
Google BigQuery
IBM DB2 and Informix
InfluxDB
MySQL and MariaDB
Neo4j
OpenSearch
Oracle
PostgreSQL
Presto and Trino
Salesforce

Alternatives to Blazer

See all Blazer alternatives →

Used Blazer? Be the first to review it

The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Blazer for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

Write a reviewTwo minutes · verified accounts only · read by an editor before it appears

Reviews come only from verified accounts. Sign in or create an account first — your e-mail is never shown.

Title

Your review

0 characters · at least 80, up to 3,000

Pros (optional · one per line)

Cons (optional · one per line)

Your name (shown with your review)

Role (optional)

Company (optional)

How long have you used it?

I've used Blazer myself and this is my honest opinion — nobody paid or asked me to write it.

Posted from your verified account. Reviews appear after an editor reads them, usually within two working days.

Featured on iTechGuides

Blazer is listed in our Business Intelligence Tools directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/blazer/"><img src="https://www.itechguides.com/best/badge/blazer.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update