ERBuilder vs Mermaid Viewer vs Whiteboard by Athena AI vs Napkin

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

Your tool
ERBuilder
vs
Competitor 1
Mermaid Viewer
Competitor 2
WBWhiteboard by Athena AI
Competitor 3
Napkin
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 Mermaid Viewer
mermaidviewer.com
Mermaid Viewer runs entirely in your browser
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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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Traffic estimated monthly website traffic
Monthly visits
5.4Kvisits/mo
143.2Kvisits/mo
1.1Kvisits/mo
1.3Mvisits/mo
MoM change
▼ 6.3%
▼ 10.9%
▲ 1,238.1%
▼ 8.5%
6-month growth
-22.4%
-9.3%
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-46.4%
Global rank web
#3,419,998
#317,277
#12,935,820
#36,124
Avg. last 3 months
5.9K
163.4K
402
1.4M
Bounce rate lower is better
39%
45%
38%
41%
Pages / visit
1.9
1.8
1.1
3.9
Visit duration
15s
19s
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2m 36s
Traffic sources
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● Direct 81% · ● Referral 19%
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● Direct 86% · ● Referral 9%
ERBuilderMermaid ViewerWhiteboard by Athena AINapkin
0831.2K1.7M2.5M3.3MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KMermaid Viewer · 158.9KMermaid Viewer · 157.9KMermaid Viewer · 184.8KMermaid Viewer · 170.5KMermaid Viewer · 186.3KMermaid Viewer · 160.7KMermaid Viewer · 143.2KWhiteboard 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 · 1.3M101001K10K100K1M10MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KMermaid Viewer · 158.9KMermaid Viewer · 157.9KMermaid Viewer · 184.8KMermaid Viewer · 170.5KMermaid Viewer · 186.3KMermaid Viewer · 160.7KMermaid Viewer · 143.2KWhiteboard 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 · 1.3MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Free Trial
Freemium
Freemium
Freemium
Starting price
$139per month
$69.99per month · free tier available
$5.99per month · free tier available
$9per month · free tier available
Free tier
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Free trial
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API access
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–
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Plans
Professional (Subscription) $139/yrEnterprise (Subscription) $399/yrProfessional (Lifetime) $279Enterprise (Lifetime) $799
Free FreeStarter $69.99/yrPro $119.99/yr
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Capabilities input → output
Input
Text
CodeText
Text
DataText
Output
Data
CodeImages
Images
DataImagesSlides
Skill level
Intermediate
Intermediate
Beginner-friendly
Beginner-friendly
Categories
Productivity & OfficeAI Diagram Generator
Productivity & OfficeAI Diagram Generator
Design & CreativeProductivity & OfficeAI Diagram GeneratorAI Mind Mapping+1 more
Design & CreativeProductivity & OfficeAI ChartingAI Diagram Generator+3 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
5
6
9
7
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
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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.