Eraser
Relay.app
| Feature | Eraser | Relay.app |
|---|---|---|
| Pricing | Free / from $10/mo | Free / from $16/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.3 / 5 |
| Best For | engineering-teams, solution-architects, technical-documentation, system-design | operations-teams, agencies, small-businesses, compliance-teams |
| Founded | 2022 | 2021 |
| Diagrams As Code | ✓ | ✗ |
| Ai Diagrams | ✓ | ✗ |
| Whiteboarding | ✓ | ✗ |
| Documentation | ✓ | ✗ |
| Version History | ✓ | ✗ |
| Templates | ✓ | ✗ |
| Collaboration | ✓ | ✗ |
| Workflow Builder | ✗ | ✓ |
| Ai Steps | ✗ | ✓ |
| Human Approvals | ✗ | ✓ |
| Multiplayer Editing | ✗ | ✓ |
| Integrations | ✗ | ✓ |
| Conditional Logic | ✗ | ✓ |
✓ Eraser Pros
- AI-generated diagrams from text descriptions
- Code-first diagrams with version control
- Combines docs and diagrams in one canvas
- Purpose-built for technical architecture docs
✗ Eraser Cons
- Limited general-purpose whiteboarding features
- Smaller template library than Miro/Lucidchart
- Not suited for non-technical teams
✓ 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
The Verdict
Eraser is built for engineering teams and solution architects, with a focus on diagrams-as-code and ai-diagrams. Relay.app targets operations teams and agencies and leads with workflow-builder and ai-steps.
On pricing, Eraser is the clear winner for budget-conscious users — starting at $10/mo compared to $16/mo for Relay.app. That $6/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.
Feature-wise, Eraser offers broader built-in capabilities (7 features vs 6), while Relay.app takes a more focused approach — which can mean a simpler, faster onboarding experience.
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.