Some major Difference between Flow and Workflow.
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3 weeks ago
What is Workflow?
Workflow (built in the classic Workflow Editor) is the older automation tool in ServiceNow. It uses the Workflow Engine and is represented visually as a diagram with activities like approvals, tasks, timers, and scripts.
It has been used for years in areas such as:
- Legacy Service Catalog workflows
- Older change/request fulfillment processes
- Older custom automations built with “activities”
What is Flow Designer?
Flow Designer is the newer, strategic automation platform in ServiceNow. It uses the Flow Engine and is built for low-code/no-code automation with reusable components like Actions and Subflows, plus stronger integration support (often via IntegrationHub spokes).
Flow Designer is widely used for:
- New Service Catalog fulfillment (Catalog Flows)
- Cross-application automation (HR, ITSM, CSM, SecOps, etc.)
- Integrations (REST, SOAP, Jira, AD, Teams, Slack, etc., depending on licensing/spokes)
- Event-driven automation and orchestration
ServiceNow recommends Flow Designer for new development in most cases.
High-level comparison table
Category Workflow (Legacy) Flow Designer (Modern)
| Primary tool | Workflow Editor | Flow Designer |
| Engine | Workflow Engine | Flow Engine |
| ServiceNow direction | Maintenance/legacy for many use cases | Strategic/default for new automation |
| Ease of use | More technical; older UI | Modern low-code UX, data pills, guided building |
| Reusability | Subworkflows exist but less modular | Strong reusability with Actions and Subflows |
| Integrations | Possible, often script-heavy | Strong integration support via IntegrationHub actions/spokes |
| Debugging/troubleshooting | Workflow context + logs | Rich Execution Details, step-by-step inputs/outputs |
| Versioning | Supported (workflow versions) | Strong versioning and easier iteration/activation |
| Trigger types | Often started via BR/UI action/script | Many triggers: record, schedule, inbound/API, event (varies by setup) |
| Extensibility | Custom Activities (older model) | Custom Actions/Subflows (preferred model) |
| Scripting | Common for complex logic | Possible, but more “configuration-first” |
| Deployment | Update sets | Update sets / App scope-friendly packaging |
Detailed differences (in practical terms)
1) User experience & development approach
Workflow
- Built in the Workflow Editor (older canvas UI).
- Activities are often more “engine-specific” and can require more platform knowledge.
- Complex logic frequently leads to scripts inside workflow activities.
Flow Designer
- Built in Flow Designer (modern interface).
- Uses Data Pills (drag-and-drop outputs from previous steps).
- Encourages a cleaner separation:
- Flow = orchestration (the “recipe”)
- Action = reusable step
- Subflow = reusable mini-process
Result: Flow Designer is typically easier to build, read, reuse, and maintain.
2) Reusability and standardization
Workflow
- Supports subworkflows, but reusability is generally less modular and less standardized across teams.
- Custom logic often becomes “embedded” inside a workflow.
Flow Designer
- Designed for reusability:
- Actions can be reused across many flows
- Subflows can be called by multiple flows, catalog items, or other processes
- Supports better standardization across an organization (shared actions like “Create Task”, “Notify Group”, “Call REST API”, etc.)
3) Integrations and orchestration
Workflow
- Integrations are possible, but often require:
- Script activities
- Custom code
- Older orchestration patterns
Flow Designer
- Integrations are a major strength:
- Many integrations are available as spokes (e.g., REST, Microsoft Teams, Slack, Jira, AD, etc.)
- Steps often require little or no script
- Note: Some integration capabilities require IntegrationHub licensing (depends on the spoke/action).
4) Troubleshooting and operational support
Workflow
- Troubleshooting typically uses:
- Workflow Context record
- Workflow Log
- Logs can be less intuitive for non-developers.
Flow Designer
- Provides detailed, step-by-step Execution Details:
- Inputs and outputs per step
- Clear error messages
- Easier “what happened and why” visibility
Result: Flow Designer generally reduces time to troubleshoot and support automations.
5) Triggers and event-driven automation
Workflow
- Often started manually or by something like:
- Business Rule calling “Start workflow”
- UI Action
- Scripted start conditions
- Works well, but the pattern is older and more developer-driven.
Flow Designer
- Supports modern trigger patterns such as:
- Record created/updated triggers
- Scheduled triggers
- API/invocation (depending on design)
- Potential event-driven patterns (depending on implementation)
6) Customization model (Activities vs Actions)
Workflow
- Extensibility is often done via custom activities.
- Custom activities are an older development approach and can be harder to maintain.
Flow Designer
- Extensibility is done via:
- Custom Actions
- Subflows
- Optional scripted steps where necessary
This is the newer, recommended extensibility model.
7) Service Catalog usage (common real-world difference)
Workflow (Legacy Catalog)
- Many older catalog items use Catalog Workflows (Workflow Editor).
- Still commonly found in long-running instances.
Flow Designer (Modern Catalog)
- Newer implementations use Catalog Flows.
- Reusable fulfillment logic is easier with subflows/actions.
Recommendations / Best Practice Guidance
Use Flow Designer when:
- You are building new automations
- You need reusability (subflows/actions)
- You want better debugging/monitoring
- You are integrating with external systems (especially with IntegrationHub)
- You want automation that’s easier for admins (not just developers) to maintain
Use Workflow when:
- You are maintaining existing legacy workflows
- You have out-of-the-box processes still heavily based on Workflow in your environment
- Migration effort is not currently justified (e.g., stable process with low change rate)
General guidance: For most new development, prefer Flow Designer. Keep Workflow for legacy processes until you have a planned modernization/migration.
Migration note (Workflow → Flow Designer)
ServiceNow commonly modernizes by:
- Identifying high-value workflows to convert (high change rate, high support cost, integration-heavy).
- Rebuilding logic as:
- One or more Flows (or Catalog Flows)
- Shared Subflows for common steps
- Shared Actions for repeated tasks/integrations
- Running parallel testing before retiring the legacy workflow.
Migration is usually a rebuild, not a simple “one-click conversion,” because the engines and constructs differ.
Summary
- Workflow is the legacy automation engine: powerful, proven, but older and less modular.
- Flow Designer is the modern automation platform: easier, more reusable, better integrated, and ServiceNow’s recommended direction for new automation.
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