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Ruby on Rails vs Flask

Security & risk comparison · Updated June 2026

How does Ruby on Rails compare to Flask on security, AI-readiness, and total cost of ownership? We scored both across 7 dimensions using NVD/NIST CVE data, GitHub metrics, and our scan of 10M+ sites.

Key finding

Ruby on Rails scores 64/100 overall versus Flask's 63/100. Ruby on Rails has 180 total CVEs compared to Flask's 30, though its larger ecosystem contributes to a higher CVE count. (Source: WebPulse framework scoring, NVD/NIST, July 2026)

64
Ruby on Rails
Modern · RUBY
vs
63
Flask
Modern · PYTHON
Dimension-by-dimension breakdown
security Flask
62
75
Ruby on Rails
Flask
performance Tie
65
65
Ruby on Rails
Flask
ecosystem Ruby on Rails
70
50
Ruby on Rails
Flask
ai readiness Ruby on Rails
72
70
Ruby on Rails
Flask
developer experience Tie
70
70
Ruby on Rails
Flask
market trajectory Ruby on Rails
50
40
Ruby on Rails
Flask
cost of ownership Tie
60
60
Ruby on Rails
Flask
Security details
Metric Ruby on Rails Flask
Total CVEs 180 30
Critical CVEs 18 3
Exploited (KEV) 2 0
CVEs last year 15 5
Avg CVSS 5.8 4.8
Security score 62/100 75/100
Acceptable
Ruby on Rails

Ruby on Rails scores 65/100. Verdict: Acceptable.

Acceptable
Flask

Flask scores 64/100. Verdict: Acceptable.

Quick facts
Ruby on Rails
Category: Backend
Language: RUBY
First release: 2004
Generation: Modern
Trend: Stable
Market share: 0.8%
Flask
Category: Backend
Language: PYTHON
First release: 2010
Generation: Modern
Trend: Stable
Market share: 0.5%
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Data sourced from NVD/NIST CVE database, GitHub API, and WebPulse framework scanner. Scores calculated using a 7-dimension model covering security, performance, ecosystem health, AI-readiness, developer experience, market trajectory, and cost of ownership. Updated June 2026.