ERBuilder vs Napkin vs CodeViz 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
Napkin
Competitor 2
CodeViz
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.
Remove
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.
Make main Remove
Competitor CodeViz
codeviz.ai
The free tier caps you at five diagrams monthly and one repository
Make main Remove
Competitor Mermaid Viewer
mermaidviewer.com
Mermaid Viewer runs entirely in your browser
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
5.4Kvisits/mo
1.3Mvisits/mo
3.4Kvisits/mo
143.2Kvisits/mo
MoM change
▼ 6.3%
▼ 8.5%
▼ 44.8%
▼ 10.9%
6-month growth
-22.4%
-46.4%
+35.5%
-9.3%
Global rank web
#3,419,998
#36,124
#4,939,424
#317,277
Avg. last 3 months
5.9K
1.4M
4.1K
163.4K
Bounce rate lower is better
39%
41%
35%
45%
Pages / visit
1.9
3.9
1.8
1.8
Visit duration
15s
2m 36s
16s
19s
Traffic sources
—
● Direct 86% · ● Referral 9%
—
● Direct 81% · ● Referral 19%
ERBuilderNapkinCodeVizMermaid Viewer
0831.2K1.7M2.5M3.3MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KNapkin · 3.3MNapkin · 2.7MNapkin · 2.4MNapkin · 2.3MNapkin · 2.4MNapkin · 2.1MNapkin · 1.8MNapkin · 1.6MNapkin · 1.4MNapkin · 1.3MCodeViz · 4.2KCodeViz · 6.4KCodeViz · 2.7KCodeViz · 2.5KCodeViz · 6.3KCodeViz · 3.3KCodeViz · 2.5KCodeViz · 6.2KCodeViz · 3.4KMermaid Viewer · 158.9KMermaid Viewer · 157.9KMermaid Viewer · 184.8KMermaid Viewer · 170.5KMermaid Viewer · 186.3KMermaid Viewer · 160.7KMermaid Viewer · 143.2K1K10K100K1M10MERBuilder · 10.9KERBuilder · 12.8KERBuilder · 16KERBuilder · 7KERBuilder · 8.8KERBuilder · 8.8KERBuilder · 6.4KERBuilder · 5.8KERBuilder · 5.4KNapkin · 3.3MNapkin · 2.7MNapkin · 2.4MNapkin · 2.3MNapkin · 2.4MNapkin · 2.1MNapkin · 1.8MNapkin · 1.6MNapkin · 1.4MNapkin · 1.3MCodeViz · 4.2KCodeViz · 6.4KCodeViz · 2.7KCodeViz · 2.5KCodeViz · 6.3KCodeViz · 3.3KCodeViz · 2.5KCodeViz · 6.2KCodeViz · 3.4KMermaid 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
$9per month · free tier available
$19per month · free tier available
$69.99per month · free tier available
Free tier
–
Free trial
–
–
API access
–
–
–
Plans
Professional (Subscription) $139/yrEnterprise (Subscription) $399/yrProfessional (Lifetime) $279Enterprise (Lifetime) $799
—
Free FreePro $19/moTeams $50/moCustom $0
Free FreeStarter $69.99/yrPro $119.99/yr
Capabilities input → output
Input
Text
DataText
CodeText
CodeText
Output
Data
DataImagesSlides
Images
CodeImages
Skill level
Intermediate
Beginner-friendly
Intermediate
Intermediate
Categories
Productivity & OfficeAI Diagram Generator
Design & CreativeProductivity & OfficeAI ChartingAI Diagram Generator+3 more
Development & CodeProductivity & OfficeAI Developer ToolsAI Diagram Generator
Productivity & OfficeAI Diagram Generator
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
5
7
8
6
Diagrams
Diagram assistance
–
Code diagramming
–
–
Flowcharts
–
–
Architectural diagramming
–
–
–
Code visualization
–
–
–
Data modeling
–
–
–
Infographics
–
–
–
Mind maps
–
–
–
Charts
–
–
–
Code documentation
–
–
–
Data charts
–
–
–
Database design
–
–
–
Mermaid images
–
–
–
Code reviews
–
–
–
Onboarding tutorials
–
–
–
Presentations
–
–
–
Schema generation
–
–
–
UML diagrams
–
–
–
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
–
–
–
–

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.