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Head-to-head · Data Virtualization Software

Query Streams vs Promethium

  • Updated Sep 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Query Streams #3 in Data Virtualization Software 7.9/10 Free plan · paid from $15/mo · 30-day trial Free plan✓ 2 of 3 features Visit Query Streams
Promethium #8 in Data Virtualization Software 6.5/10 Pricing on request ✓ 3 of 3 features Visit Promethium

Query Streams leads on 1 check, Promethium on 1, and 2 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreQuery Streams · 7.9/10
  • Free planonly Query Streams
  • Most featuresPromethium · 3 of 3

Query Streams scores higher on our rubric for data virtualization software: 7.9 against 6.5 out of 10; our editors rank them #3 and #8.

Query Streams offers free plan; Promethium doesn't publish it. Promethium offers semantic layer; Query Streams doesn't.

Query Streams is the better fit for affordable connector-rich federation. Promethium is the better fit for AI-oriented zero-copy data access.

  • Query Streams fits best

    Affordable connector-rich federation

  • Promethium fits best

    AI-oriented zero-copy data access

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.

Side by side

Feature Query Streams 7.9/10 Visit ↗ Promethium 6.5/10 Visit ↗
At a glance
Editor score 7.9 6.5
Ranking #3 in Data Virtualization Software #8 in Data Virtualization Software
Best for Affordable connector-rich federation AI-oriented zero-copy data access
Pricing model Free plan + paid Paid
Starting price $15/mo Not published
Free plan ✓ (best) Not published
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web, Windows, macOS, Linux Web
Integrations 59+ integrations 20 integrations
Built for Solo, Small business, Mid-market, Enterprise Enterprise
Features Query Streams 2/3 · Promethium 3/3
Semantic layer — ✓ (best)
REST API access ✓ ✓
Query acceleration ✓ ✓
Specs
Deployment model Hybrid Hybrid
Source connectors 59 Not published
Access protocols SQL, REST API, MCP MCP, REST APIs
Our review
Pros
  • Federated SQL queries without copying data
  • 59 verified connectors across databases and APIs
  • MCP, REST API, spreadsheets and scheduled automation
  • Queries cloud, on-premises, and SaaS data without replication or ETL
  • Combines semantic governance, lineage, explainability, and access controls
  • Delivers natural-language answers through Mantra, MCP, and APIs
Cons
  • No formal semantic modeling layer
  • Business-tier reporting and automation starts at $50 per month
  • Personal Core includes a 25 MB/month data allowance
  • Custom-quote pricing makes direct budget comparison harder
  • Hybrid deployment includes a customer-hosted data plane
  • Enterprise-oriented scope may exceed simpler data access needs
Our verdict

Query Streams is a data integration and query platform for analysts and teams that need live SQL access across databases, APIs and spreadsheets. It supports federated queries across multiple databases, represents API endpoints as queryable…

Read the review →

Promethium is a hybrid data virtualization and AI insights platform for enterprise data teams. It gives data architects, analysts, business users, engineers, and AI platform teams governed access to distributed cloud, on-premises, and SaaS…

Read the review →
  1. Query StreamsData Virtualization Software 7.9Free plan · paid from $15/mo · 30-day trial
  2. PromethiumData Virtualization Software 6.5Pricing on request

Strengths and trade-offs

  • Query Streams — where it wins

    • Federated SQL queries without copying data
    • 59 verified connectors across databases and APIs
    • MCP, REST API, spreadsheets and scheduled automation

    Where it doesn't

    • No formal semantic modeling layer
    • Business-tier reporting and automation starts at $50 per month
    • Personal Core includes a 25 MB/month data allowance

  • Promethium — where it wins

    • Queries cloud, on-premises, and SaaS data without replication or ETL
    • Combines semantic governance, lineage, explainability, and access controls
    • Delivers natural-language answers through Mantra, MCP, and APIs

    Where it doesn't

    • Custom-quote pricing makes direct budget comparison harder
    • Hybrid deployment includes a customer-hosted data plane
    • Enterprise-oriented scope may exceed simpler data access needs
  • Query Streams7.9/10 · Free plan · paid from $15/mo · 30-day trial

    A focused, affordable federation layer with broad connectors and practical delivery options.

    Visit Query StreamsFull verdict →
  • Promethium6.5/10 · Pricing on request

    A strong fit for governed, zero-copy data access with AI-ready querying.

    Visit PromethiumFull verdict →

More comparisons

All data virtualization software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update