MailOnce vs fmsg.ai
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
MailOnce compared with fmsg.ai
| Detail | 
MailOnce | 
fmsg.ai |
|---|
| What it does | Temporary email for verification messages and OTP codes in a browser-scoped, auto-expiring inbox
| Messaging for the AI era
|
|---|
| Stage | Not given
| Not given
|
|---|
| Founded | Not given
| Not given
|
|---|
| Based in | Not given
| AU
|
|---|
| Pricing model | Free
| Freemium
|
|---|
| Pricing | Not given
| Individual: Free with 16 GB storage, 10,000 messages/day, 3 sub-addresses. Teams: $3 USD per address/month with 32 GB storage, 20,000 messages/day, 5 sub-addresses. Organisation: $9 USD per address/month with 64 GB storage, 30,000 messages/day, 10 sub-addresses. Add-ons: $8 per 32 GB/month, $2 per 1
|
|---|
| Key features | - Instant temporary email creation without signup
- Auto-expiring inbox after one hour, extendable to three hours
- Automatic OTP code detection and copying
- Verification link detection and opening
- Custom email address selection
- Secure device linking with QR code approval
- Real-time message delivery without manual refresh
- Multiple domain options for custom addresses
- Safe email change with confirmation step
| - Addresses on custom domain
- Sub-addresses for AI agents and software
- Sender verification and cryptographic chains
- Message integrity and tamper-proof delivery
- Per-address and domain-wide access controls
- Anomaly and loop detection rules engine
- Web, desktop and mobile applications
- Per-message cyber scanning (Organisation plan)
- Audit tooling and secure data erasure
|
|---|
| What makes it different | - No account creation required to use the service
- Privacy-focused design with clear lifecycle boundaries
- Security claims tied to implemented controls, not empty promises
- Designed for practical utility rather than unnecessary features
| - Built on open standard with no vendor lock-in
- Cryptographic sender verification unlike email
- Efficient binary encoding reduces bandwidth significantly
- Can run on premises or self-hosted
- Domain-distributed architecture avoids single point of failure
|
|---|
| Community votes | 0 | 0 |
|---|
| DR (Domain Rating by Ahrefs) | 2 ▼ −1 (down) since last check | 4 ▲ +3 (up) since last check |
|---|
| Trust Flow (Majestic) | 4 | 0 |
|---|
| Citation Flow (Majestic) | 22 | 12 |
|---|
| Referring domains (Majestic) | 10 | 4 |
|---|
4 details filled in for both companies.
More alternatives to MailOnce More alternatives to fmsg.ai