Online Sound Test vs Zyntra
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Online Sound Test compared with Zyntra
| Detail | 
Online Sound Test | Z
Zyntra |
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| What it does | Private browser audio tests and troubleshooting for speakers, headphones and microphones
| Email testing API for sign-up and password-reset flows
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| PL
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| Pricing model | Free
| Freemium
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| Pricing | Not given
| Free: 150 emails/month, 500 API requests/month. Starter: $9/month billed yearly or $11/month billed monthly, 10,000 emails/month. Pro: $29/month billed yearly or $39/month billed monthly, 50,000 emails/month.
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| Key features | - Speaker sound test with bass and distortion check
- Stereo balance and channel separation test
- Left and right channel detection
- Surround sound test for 5.1 and 7.1 channels
- Microphone input level testing
- Tone generator with sine, square and more
- Frequency sweep from low to high
- Bass test for 20–200 Hz frequencies
- Phase test for polarity and center focus
- Spectrum analyzer with private microphone FFT
| - REST API to read emails
- Automatic link extraction from emails
- Node.js SDK for testing
- MCP server for AI agents
- Web dashboard for manual QA
- Works with any HTTP test framework
- Email attachment support
- 30-second wait for email arrival
- Separate inboxes per test run with unique tags
- Variable mail retention by plan
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| What makes it different | - 100% private—audio signals generated locally, nothing uploaded
- Guided diagnosis ranks likely causes with system-specific fixes
- Explainable results showing what browser can and cannot verify
- No medical or calibration claims, focused on practical troubleshooting
- Procedure-based testing with 12 step-by-step guides
| - No inbox creation needed to start testing
- Real email delivery path through your own provider
- Unique inbox per test run prevents parallel test interference
- Links already extracted from emails for easy testing
- Three ways to read emails: API, web viewer, or AI agent
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 2 ▲ +1 (up) since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 17 | 3 |
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| Citation Flow (Majestic) | 18 | 28 |
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| Referring domains (Majestic) | 21 | 63 |
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4 details filled in for both companies.
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