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Ruby on Rails vs FastAPI

Security & risk comparison · Updated June 2026

How does Ruby on Rails compare to FastAPI on security, AI-readiness, and total cost of ownership? We scored both across 7 dimensions using NVD/NIST CVE data, GitHub metrics, and our census of the Tranco top 100,000.

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, NIST NVD and CISA KEV, updated June 2026)

Who actually runs Ruby on Rails and FastAPI

Share of sites with an identified platform, from WebPulse's scan of the Tranco top 100,000 and our Common Crawl census.

WhereRuby on RailsFastAPI
Top 1,000 3.3% (7) 0.0% (0)
Top 10,000 3.3% (85) 0.1% (2)
Top 100,000 3.0% (832) 0.0% (13)
Wider web0.9%0.0%

Highest-ranked sites on Ruby on Rails

  1. www.gov.uk#308
  2. duolingo.com#457
  3. goodreads.com#463
  4. openstreetmap.org#579
  5. service.gov.uk#666

Highest-ranked sites on FastAPI

  1. dmm.com#4,545
  2. courtlistener.com#6,757
  3. cert.org#17,544
  4. pullkin.eu#18,881
  5. kik.com#19,550

Detected from each homepage's HTML, headers and cookies in September 2026. Methodology

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

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

Recommended
FastAPI

FastAPI scores 83/100. Verdict: Recommended.

Quick facts
Ruby on Rails
Category: Backend
Language: RUBY
First release: 2004
Generation: Modern
Trend: Stable
Market share: 0.8%
FastAPI
Category: Backend
Language: PYTHON
First release: 2018
Generation: Modern
Trend: Rising
Market share: 0.6%
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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.