Side by side
HERON vs Zelma
Compare what each tool does, what it costs, and how it fits your workflow.
Designed for
AI tool that grades handwritten exams in seconds.
Explore student test data with plain English queries.
Primary task
Exam grading
Educational data analysis
Pricing
Freemium · Free + from $3
Free
Pricing details
Free + from $3
Free
Billing cycle
Pay-as-you-go
Not documented
API access
Not documented
Not documented
Platforms
Android
Web
Integrations
Not documented
Not documented
Source rating
No rating recorded
No rating recorded
Catalog views
253
1.2k
Estimated monthly traffic
—
—
Catalog imported
31 Aug 2026
30 Aug 2026
Listed strengths
- Grades handwritten exams quickly
- Accurate handwriting interpretation
- Exams captured via smartphone
- Grading templates and rubrics
- Digital record creation
- Specializes in U.S school data
- Enabled plain language queries
- Converts English questions to insights
- Covers range of educational inquiries
- Allows score comparisons
Listed limitations
- Requires smartphone camera
- Possible misinterpretation of handwriting
- Copying tools limited
- Dependency on saved templates
- Limited handwriting styles recognized
- Limited to U.S data
- No API for integration
- Lacks multi-language support
- Cannot customize visualizations
- No downloadable data