Migration Guide
Migrate from Heroku to Modal
Move Heroku app and worker workloads to Modal with function/job mapping, dependency packaging, and runtime strategy.
What you get
Risk assessment
Blockers, warnings, and unknowns ranked by severity
Effort estimate
Hours, t-shirt size, and role breakdown
Cost estimate
Labor, infrastructure, and tooling cost range
Migration steps
Ordered execution plan with durations
Open questions
What still needs to be answered before you start
Draft config or code
Starter configs when the migration path supports it
Why teams migrate from Heroku to Modal
Good fit when
- +Teams moving Python-heavy workers, scheduled jobs, or compute tasks off Heroku.
- +Apps that benefit from function/job execution over always-on dyno patterns.
Strengths
- Strong developer experience for Python compute and background execution.
- Simple scaling model for bursty jobs and event-driven workloads.
Tradeoffs
- Not a 1:1 replacement for every always-on PaaS web app architecture.
- Best fit skews toward Python and compute-heavy patterns.
Migration notes
- Map Procfile web/worker processes to Modal endpoints, jobs, and schedules.
- Define dependency/image strategy and secret management before cutover.
How it works
Describe your migration
Select Heroku as source and Modal as target. Add context about your setup — configs, docs, architecture notes.
Keshro runs the analysis
Keshro researches the path, finds similar past migrations, and generates a structured assessment with risks, effort, cost, and steps.
Get your plan
Review the migration plan, refine it with your team, and use it as a living document during execution.
Resources
Related migrations
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