| What it does | API sequence diagram tool with payloads on every arrow
| Free web tools for SEO, code and everyday tasks
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| Stage | Not given
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| Pricing model | Freemium
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| Pricing | Free: editor, local diagrams, share links, SVG and PNG export, CLI, 3 saved diagrams, HAR imports up to 8 requests, 200 hosted API and MCP calls a month, 1 webhook inbox with 25 requests a month, 1 recording link with 3 recordings. Pro: $9/month or $90/year (billed in advance), up to 1,000 saved dia
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| Key features | - Plain-text sequence diagram editor with real-time rendering
- Request and response payloads displayed on every arrow
- HAR file import with automatic redaction of secrets
- Webhook inbox to capture and diagram provider deliveries
- Recording links to collect customer HAR files as diagrams
- Drift Check to update diagrams when APIs change
- SVG and PNG export for sharing and embedding
- AI agent support via MCP server, HTTP API and CLI
- README embeds that update when diagrams are edited
- Presentation mode for step-through walkthroughs
| - On-Page SEO Checker to audit page titles, meta tags, headings, images, links, canonical and structured data
- Website Speed Test with Google PageSpeed Insights and Core Web Vitals
- Image Compressor to shrink JPG, PNG and WebP images in bulk and resize
- JSON Beautifier to format, validate and minify JSON
- Broken Link Checker to find broken links, dead images and redirects
- DNS Lookup to fetch domain DNS records
- Website SEO Audit to crawl up to 100 pages and find missing titles and duplicate descriptions
- Password Generator to create strong random passwords
- QR Code Generator to turn links into scannable QR codes
- PDF tools including merge, split, compress, rotate, sign and watermark
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| What makes it different | - No account needed to write and share diagrams
- AI can write diagrams from plain-text syntax
- Built from real traffic: HAR files, webhooks and customer recordings
| - 348 free tools with no sign-up required
- Most tools run in your browser so files stay on your device
- No accounts, no trials, no restrictions on tool usage
- Tools have no daily limits and light rate limits keep service fast
- Plain explanations for every result, not just numbers
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 3 ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 3 | 2 |
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| Citation Flow (Majestic) | 22 | 19 |
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| Referring domains (Majestic) | 8 | 10 |
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