Quick Comparison
| Feature | TempMailUSA | Guerrilla Mail |
|---|---|---|
| Domains | 300+ | ~10 |
| Signup required | No | No |
| Temp phone numbers | Yes (SMS/OTP) | No |
| API access | Yes | Limited |
| Mobile app | Yes (Android) | No |
| Custom domains | Yes (Pro) | No |
| Interface | Modern | Dated |
| Free plan | Yes | Yes |
Detailed Breakdown
Domains & Deliverability
TempMailUSA offers 300+ domains vs Guerrilla Mail's ~10. More domains means better deliverability — if one domain gets blocked, you have hundreds of alternatives. Guerrilla Mail's small pool gets flagged more often.
Features
TempMailUSA includes temp phone numbers for SMS verification, an API for developers, and a mobile app. Guerrilla Mail is email-only with a dated interface that hasn't changed significantly in years.
Privacy
Both services offer anonymous temporary email. TempMailUSA emphasizes zero-log policy and USA-based infrastructure.
Verdict
Choose TempMailUSA if you want more domains, temp phone numbers, API access, and a modern interface.
Choose Guerrilla Mail if you prefer a simple, no-frills tool and don't need extra features.
For most users in 2026, TempMailUSA offers significantly more value.