Neither Salesforce Heroku nor Vercel offers a free trial.
Salesforce Heroku is designed for Large Enterprises, Medium Business and Small Business.
Vercel is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Salesforce Heroku Starts at $4,000/Month whereas for Vercel Starts at $20/User/Month.
Some top alternatives to Salesforce Heroku includes Jelastic, KloudConnectors, The Cloud Connectors, Clustered Cloud, Salesforce Sales Cloud, CloudApps, Serverless Cloud, Porter, Salesforce Partner Relationship Management and Salesforce Connect.
Some top alternatives to Vercel includes Frontnd, Netlify, GitHub, Firebase, Frontendor, Serverless Cloud, Cloudflare Pages, PageDeploy and Salesforce Heroku.