Relay.app
Spark
| Feature | Relay.app | Spark |
|---|---|---|
| Pricing | Free / from $16/mo | Free / from $7.99/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.3 / 5 | 4.4 / 5 |
| Best For | operations-teams, agencies, small-businesses, compliance-teams | professionals, small-teams, freelancers, mac-users |
| Founded | 2021 | 2015 |
| Workflow Builder | ✓ | ✗ |
| Ai Steps | ✓ | ✗ |
| Human Approvals | ✓ | ✗ |
| Multiplayer Editing | ✓ | ✗ |
| Integrations | ✓ | ✗ |
| Conditional Logic | ✓ | ✗ |
| Smart Inbox | ✗ | ✓ |
| Ai Writing | ✗ | ✓ |
| Team Email | ✗ | ✓ |
| Scheduling | ✗ | ✓ |
| Templates | ✗ | ✓ |
| Priority Sorting | ✗ | ✓ |
✓ Relay.app Pros
- Human-in-the-loop approvals
- AI steps built in
- Collaborative workflows
- Clean modern interface
✗ Relay.app Cons
- Fewer integrations than Zapier
- Newer platform
- Limited advanced logic
✓ Spark Pros
- Beautiful design
- AI writing assistant
- Smart inbox
- Team features
✗ Spark Cons
- Limited platform support
- Privacy concerns
- Some features behind paywall
The Verdict
Relay.app is built for operations teams and agencies, with a focus on workflow-builder and ai-steps. Spark targets professionals and small teams and leads with smart-inbox and ai-writing.
On pricing, Spark is the clear winner for budget-conscious users — starting at $7.99/mo compared to $16/mo for Relay.app. That $8.01/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.