OpenSlides vs Mermaid Viewer

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

OpenSlides compared with Mermaid Viewer
Detail	OpenSlides	Mermaid Viewer
What it does	A deck studio that runs in your browser with animated slides, live presenting, narration, dubbing and video export	Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Freemium
Pricing	Free: all features except AI. AI on account credits: 1,000 credits for $5 or 5,000 for $20. Optional cloud services billed by their providers.	Free: unlimited editor and preview, 3 saved diagrams, 5 AI uses total, PNG export 1× with watermark. Starter: $6.99/month or $69.90/year; 30 saved diagrams, 500 AI conversations per month, PNG export up to 4× without watermark. Pro: $11.99/month or $119.90/year; unlimited diagrams, unlimited AI, PNG
Key features	263 animated motion components including backgrounds, kinetic type, charts, maps, 3D, and interactive widgets Live presenting with presenter view showing notes, next slide and timer Narration and dubbing in multiple languages Import and export PowerPoint files and PDF Four-step workflow from brief to finished deck with or without AI Full studio functionality on phone and tablet AI integration with multiple model providers and account credits Encrypted sharing with private links that hosts cannot read	Live preview of Mermaid code as you type AI diagram generator, editor and syntax fixer PNG export on every plan; JPG, SVG and PDF on Pro All 22+ Mermaid diagram types supported Share diagrams via public links and embeds Save diagrams to cloud with folders and version history Keyboard shortcuts and autocomplete Mobile-responsive editor with pan and pinch-zoom
What makes it different	All features except AI are completely free with no watermark and no account required Your decks stay on your device in browser storage until you choose to share them AI stays optional and works with your own keys so the company never sees your deck or bills Open source code licensed MIT or Apache-2.0 at your choice Automatic self-repair that checks and fixes AI-generated changes up to twice	No account or sign-up required to start editing diagrams Affordable pricing: Starter at $6.99/month, Pro at $11.99/month Diagrams render in your browser; nothing stored unless you choose to save Fast editor with instant rendering and clear error messages
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	6 +1 (up) since last check
Trust Flow (Majestic)	0	3
Citation Flow (Majestic)	13	23
Referring domains (Majestic)	3	12

5 details filled in for both companies.

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