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FastAPI vs Ruby on Rails

Security & risk comparison · Updated June 2026

How does FastAPI 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

FastAPI scores 82/100 overall versus Ruby on Rails's 64/100. FastAPI has 8 total CVEs compared to Ruby on Rails's 180, giving it a smaller vulnerability surface. (Source: WebPulse framework scoring, NVD/NIST, July 2026)

82
FastAPI
Modern · PYTHON
vs
64
Ruby on Rails
Modern · RUBY
Dimension-by-dimension breakdown
security FastAPI
90
62
FastAPI
Ruby on Rails
performance Tie
65
65
FastAPI
Ruby on Rails
ecosystem FastAPI
85
70
FastAPI
Ruby on Rails
ai readiness FastAPI
95
72
FastAPI
Ruby on Rails
developer experience FastAPI
88
70
FastAPI
Ruby on Rails
market trajectory FastAPI
70
50
FastAPI
Ruby on Rails
cost of ownership FastAPI
75
60
FastAPI
Ruby on Rails
Security details
Metric FastAPI Ruby on Rails
Total CVEs 8 180
Critical CVEs 0 18
Exploited (KEV) 0 2
CVEs last year 2 15
Avg CVSS 3.5 5.8
Security score 90/100 62/100
Recommended
FastAPI

FastAPI scores 83/100. Verdict: Recommended.

Acceptable
Ruby on Rails

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

Quick facts
FastAPI
Category: Backend
Language: PYTHON
First release: 2018
Generation: Modern
Trend: Rising
Market share: 0.6%
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.