Metered usage vs predictable bills
Railway's meters reward idle-lean and spiky services but produce variable invoices. Render prices fixed instance tiers ($7–$85/month) prorated per second; Heroku prices dynos by size; Vercel and Netlify use subscription-plus-credits models that stay flat until credits run out. If predictability is the reason you're leaving, fixed tiers are the direct answer.
Evidence: [1] Railway pricing [2] Render Pricing [3] Heroku pricing [4] Vercel Pricing [5] Netlify pricing