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HTMX vs Flask

Security & risk comparison · Updated June 2026

How does HTMX 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

HTMX scores 79/100 overall versus Flask's 63/100. HTMX has 1 total CVEs compared to Flask's 30, giving it a smaller vulnerability surface. (Source: WebPulse framework scoring, NVD/NIST, July 2026)

79
HTMX
Modern · JAVASCRIPT
vs
63
Flask
Modern · PYTHON
Dimension-by-dimension breakdown
security HTMX
95
75
HTMX
Flask
performance Tie
65
65
HTMX
Flask
ecosystem HTMX
80
50
HTMX
Flask
ai readiness HTMX
78
70
HTMX
Flask
developer experience HTMX
75
70
HTMX
Flask
market trajectory HTMX
55
40
HTMX
Flask
cost of ownership HTMX
90
60
HTMX
Flask
Security details
Metric HTMX Flask
Total CVEs 1 30
Critical CVEs 0 3
Exploited (KEV) 0 0
CVEs last year 0 5
Avg CVSS 2.0 4.8
Security score 95/100 75/100
Recommended
HTMX

HTMX scores 79/100. Verdict: Recommended.

Acceptable
Flask

Flask scores 64/100. Verdict: Acceptable.

Quick facts
HTMX
Category: Frontend_lib
Language: JAVASCRIPT
First release: 2020
Generation: Modern
Trend: Rising
Market share: 0.1%
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.