ERBuilder vs Whiteboard by Athena AI vs Napkin vs Mermaid Viewer

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
ERBuilder
vs
Competitor 1
WBWhiteboard by Athena AI
Competitor 2
Napkin
Competitor 3
Mermaid Viewer
Compare
4 tools · best value per row highlighted
Your tool ERBuilder
soft-builder.com
ERBuilder is a data modeling application from Softbuilder, and its generative AI feature turns plain-language descriptions into entity-relationship diagrams.
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Competitor WBWhiteboard by Athena AI
athenaboard.ai
Instant Visual Creation Describe your concept, and watch as AI instantly generates flowcharts, wireframes, mind maps, or UI prototypes—ready in seconds. Perfect for entrepreneurs, digital teams, and
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Competitor Napkin
napkin.ai
Napkin works directly from your text: paste or import it, click generate, and it proposes visuals that match the ideas in the writing.
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Competitor Mermaid Viewer
mermaidviewer.com
Mermaid Viewer runs entirely in your browser
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Traffic estimated monthly website traffic
Monthly visits
5.4Kvisits/mo
1.1Kvisits/mo
1.3Mvisits/mo
143.2Kvisits/mo
MoM change
▼ 6.3%
▲ 1,238.1%
▼ 8.5%
▼ 10.9%
6-month growth
-22.4%
—
-46.4%
-9.3%
Global rank web
#3,419,998
#12,935,820
#36,124
#317,277
Avg. last 3 months
5.9K
402
1.4M
163.4K
Bounce rate lower is better
39%
38%
41%
45%
Pages / visit
1.9
1.1
3.9
1.8
Visit duration
15s
—
2m 36s
19s
Traffic sources
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● Direct 86% · ● Referral 9%
● Direct 81% · ● Referral 19%
ERBuilderWhiteboard by Athena AINapkinMermaid Viewer
0831.2K1.7M2.5M3.3MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KWhiteboard by Athena AI · 98Whiteboard by Athena AI · 174Whiteboard by Athena AI · 78Whiteboard by Athena AI · 84Whiteboard by Athena AI · 1.1KNapkin · 3.3MNapkin · 2.7MNapkin · 2.4MNapkin · 2.3MNapkin · 2.4MNapkin · 2.1MNapkin · 1.8MNapkin · 1.6MNapkin · 1.4MNapkin · 1.3MMermaid Viewer · 158.9KMermaid Viewer · 157.9KMermaid Viewer · 184.8KMermaid Viewer · 170.5KMermaid Viewer · 186.3KMermaid Viewer · 160.7KMermaid Viewer · 143.2K101001K10K100K1M10MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KWhiteboard by Athena AI · 98Whiteboard by Athena AI · 174Whiteboard by Athena AI · 78Whiteboard by Athena AI · 84Whiteboard by Athena AI · 1.1KNapkin · 3.3MNapkin · 2.7MNapkin · 2.4MNapkin · 2.3MNapkin · 2.4MNapkin · 2.1MNapkin · 1.8MNapkin · 1.6MNapkin · 1.4MNapkin · 1.3MMermaid Viewer · 158.9KMermaid Viewer · 157.9KMermaid Viewer · 184.8KMermaid Viewer · 170.5KMermaid Viewer · 186.3KMermaid Viewer · 160.7KMermaid Viewer · 143.2KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Free Trial
Freemium
Freemium
Freemium
Starting price
$139per month
$5.99per month · free tier available
$9per month · free tier available
$69.99per month · free tier available
Free tier
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Free trial
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–
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API access
–
–
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Plans
Professional (Subscription) $139/yrEnterprise (Subscription) $399/yrProfessional (Lifetime) $279Enterprise (Lifetime) $799
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Free FreeStarter $69.99/yrPro $119.99/yr
Capabilities input → output
Input
Text
Text
DataText
CodeText
Output
Data
Images
DataImagesSlides
CodeImages
Skill level
Intermediate
Beginner-friendly
Beginner-friendly
Intermediate
Categories
Productivity & OfficeAI Diagram Generator
Design & CreativeProductivity & OfficeAI Diagram GeneratorAI Mind Mapping+1 more
Design & CreativeProductivity & OfficeAI ChartingAI Diagram Generator+3 more
Productivity & OfficeAI Diagram Generator
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
5
9
7
6
Diagrams
Flowcharts
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Diagram assistance
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Mind maps
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Code diagramming
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Data modeling
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Infographics
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Charts
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Data charts
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Database design
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Mermaid images
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Wireframes
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Collaborative design
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Google meet assistance
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Presentations
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Prototyping
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Schema generation
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UML diagrams
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UX design
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.