Eraser
Spark
| Feature | Eraser | Spark |
|---|---|---|
| Pricing | Free / from $10/mo | Free / from $7.99/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.4 / 5 |
| Best For | engineering-teams, solution-architects, technical-documentation, system-design | professionals, small-teams, freelancers, mac-users |
| Founded | 2022 | 2015 |
| Diagrams As Code | ✓ | ✗ |
| Ai Diagrams | ✓ | ✗ |
| Whiteboarding | ✓ | ✗ |
| Documentation | ✓ | ✗ |
| Version History | ✓ | ✗ |
| Templates | ✓ | ✓ |
| Collaboration | ✓ | ✗ |
| Smart Inbox | ✗ | ✓ |
| Ai Writing | ✗ | ✓ |
| Team Email | ✗ | ✓ |
| Scheduling | ✗ | ✓ |
| Priority Sorting | ✗ | ✓ |
✓ 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
✓ Spark Pros
- Beautiful design
- AI writing assistant
- Smart inbox
- Team features
✗ Spark Cons
- Limited platform support
- Privacy concerns
- Some features behind paywall
The Verdict
Eraser is built for engineering teams and solution architects, with a focus on diagrams-as-code and ai-diagrams. Spark targets professionals and small teams and leads with smart-inbox and ai-writing.
Pricing is close: Spark starts at $7.99/mo versus $10/mo for Eraser — not a deciding factor on its own.
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 Spark 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.