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Fly.io provides a $5/month credit for all users indefinitely, covering light workloads completely free, making it the only major PaaS with a sustainable free option."},{"question":"Which platform is better for global applications?","answer":"Fly.io is superior for global apps with its 35+ regions and automatic edge deployment, enabling sub-100ms latency worldwide. Heroku's 12 US-only regions require manual regional selection and lack edge computing, making it unsuitable for latency-sensitive global applications."},{"question":"Can I migrate from Heroku to Fly.io without rewriting code?","answer":"Yes, with caveats. If your Heroku app uses Procfiles and buildpacks, you'll need to Dockerize it for Fly.io (1-3 hours of work). Database migrations are straightforward using standard PostgreSQL tools. 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