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Flask vs Ruby on Rails

Security & risk comparison · Updated June 2026

How does Flask compare to Ruby on Rails 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)

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

Flask scores 64/100. Verdict: Acceptable.

Acceptable
Ruby on Rails

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

Quick facts
Flask
Category: Backend
Language: PYTHON
First release: 2010
Generation: Modern
Trend: Stable
Market share: 0.5%
Ruby on Rails
Category: Backend
Language: RUBY
First release: 2004
Generation: Modern
Trend: Stable
Market share: 0.8%
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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.