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Fly.io vs Phoenix Framework

Based on 13 and 12 real audits

View Fly.io details | View Phoenix Framework details
MetricFly.ioPhoenix FrameworkWinner
Performance7370Fly.io
Accessibility9193Phoenix Framework
Best Practices9797Tie
SEO8888Tie
Security7781Phoenix Framework
TTFB1000ms1032msFly.io
Composite8284Phoenix Framework
Performance
Fly.io
73
Phoenix Framework
70
Accessibility
Fly.io
91
Phoenix Framework
93
Security
Fly.io
77
Phoenix Framework
81
SEO
Fly.io
88
Phoenix Framework
88
Composite
Fly.io
82
Phoenix Framework
84

Phoenix Framework outperforms Fly.io in 3 of 7 categories, with a stronger composite score (84 vs 82). Fly.io leads in performance, TTFB.

When to choose Fly.io

Choose Fly.io when your primary concern is server response time and performance. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Phoenix Framework

Choose Phoenix Framework when your primary concern is security and accessibility. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 13 audited Fly.io sites and 12 audited Phoenix Framework sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

FAQ

Which is faster, Fly.io or Phoenix Framework?
Based on real BeaverCheck audits, Fly.io sites score higher on Lighthouse performance (73 vs 70 on average).
Which has better security, Fly.io or Phoenix Framework?
Phoenix Framework sites score higher on security analysis (81 vs 77 on average).
Which has better accessibility, Fly.io or Phoenix Framework?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Phoenix Framework (93 vs 91). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, Fly.io or Phoenix Framework?
Fly.io sites score higher on Lighthouse SEO signals (88 vs 88 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), Fly.io or Phoenix Framework?
Fly.io sites show lower Time to First Byte (1000 ms vs 1032 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose Fly.io or Phoenix Framework for my website?
Both platforms have trade-offs. Fly.io scores higher on overall composite score while Fly.io may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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