Hard Disk Sentinel vs SMART Sniffer
Hard Disk Sentinel
hdsentinel.comSMART Sniffer
github.comSide by side
| Figure | Hard Disk Sentinel | SMART Sniffer |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | Yes |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | — | Yes |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 7 | 2 |
| Spec score · Disk Health Monitoring Software | 8.2 (#6) | 8.3 (#5) |
| Integrations | Professional can provide drive status to developers through WMI or XML, while Professional and Enterprise support file transfer by FTP or email. | The integration provides a service call with SMART data and assessments that can be passed to Google AI, ChatGPT, Claude, or Ollama. |
| Purpose | Hard Disk Sentinel monitors, diagnoses, tests, and reports on hard disk and SSD health, performance degradation, and failures. | SMART Sniffer monitors disk health and reports early warning signs to Home Assistant. |
Plans
Hard Disk Sentinel
- DOSFree
- LinuxFree
- TrialFree
- Standard$22, paid once
- Professional$33, paid once
- Professional Family$59, paid once
- Enterprise$219.50, paid once
In their own words
Hard Disk Sentinel
Hard Disk Sentinel has no write-up on Specifiction yet; its figures are above.
SMART Sniffer
SMART Sniffer monitors disk health and sends warnings to Home Assistant. A lightweight Go agent runs on each monitored machine, where every drive appears as its own Home Assistant device. Its Attention Needed sensor covers ATA, SATA, NVMe, and SAS drives, returning NO, MAYBE, YES, or UNSUPPORTED. When a drive’s health changes, persistent Home Assistant notifications can appear automatically, with options to escalate, de-escalate, or dismiss them automatically. Agents advertise on the local network through mDNS/Zeroconf, allowing Home Assistant to find them without manual IP entry. Filesystem monitoring is optional; for configured mountpoints, it reports total, used, and available bytes plus usage percentage. An integration service call can provide SMART data and assessments for use with Google AI, ChatGPT, Claude, or Ollama. The agent also exposes HTTP endpoints for health, drive summaries, individual SMART data, and filesystem usage. SMART Sniffer is free and MIT-licensed. It requires smartmontools 7.0 or newer for JSON output; some USB enclosures that block SMART passthrough are reported as unsupported with unknown health.