Compare
Free answering machine detection, compared.
Six ways to detect machines without paying, and the catch in each. Free is not the same thing as good, and good is not the same thing as private.
| Option | What is free | The catch | |
|---|---|---|---|
| Asterisk AMD() | Free, forever, on your box. | Rules on loudness, no voice model, no screener detection, tuning by hand per carrier. | More |
| FreeSWITCH mod_amd (webitel) | Free, open source. | A port of the same rules; its maintainers call it limited testing. | More |
| Plivo machine detection | No add-on fee on Plivo calls. | Only on calls placed through Plivo, billed per minute; the audio is in Plivo's cloud. | More |
| Vonage standard machine detection | No extra charge on Vonage calls. | Vonage calls only; the advanced tier that reports the beep is paid. | More |
| AMDY sandbox | 50,000 detections a month, one server. | Raw call audio streamed to their server, unencrypted; one server only. | More |
| VM Hunter free tier | 5,000 calls a month. | Audio leaves your server, is kept 30 days and used for training. | More |
| AMDSure Free | 50,000 verdicts a month, two servers, no card, a hard cap. | Falls back to your own AMD() when the month is used up; audio stays on your box. | More |
If you are on Asterisk and want to know how much better than AMD() a real detector is on your own calls, the honest way to find out is shadow mode: AMDSure runs beside AMD() for a week and the dashboard shows both. It costs nothing on the free plan.
See it on your own traffic.
A 20 minute call. We show the console with live numbers, then set up shadow mode on your dialer so you can judge for yourself.
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