Quick Overview
Both tools solve the same core problem: sharing sensitive text (passwords, keys, credentials) through a link that works once and then self-destructs. Both are open source. But the implementation details differ significantly — especially around encryption and privacy.
The Big Difference: Where Encryption Happens
This is the most important distinction between the two tools and affects everything else about privacy and security.
With OneTimeSecret, the server receives your plaintext secret over HTTPS, then encrypts it server-side. This means the server operator can theoretically read your secret before encryption — or be compelled to by a court order, or have it exposed in a server breach.
With 1time.io, encryption happens in your browser using the Web Crypto API before anything leaves your device. The server only ever receives ciphertext that it cannot decrypt. This is true zero-knowledge architecture.
What does this mean practically? If someone compromised the 1time.io server, they would get encrypted data with no way to decrypt it. The encryption keys exist only in the URLs shared between sender and recipient, never on the server.
Feature-by-Feature Comparison
| Feature | 1time.io | OneTimeSecret |
|---|---|---|
| End-to-end encryption | ✓ Browser-side AES-GCM | ✗ Server-side encryption |
| Zero-knowledge | ✓ Server never sees plaintext | ✗ Server receives plaintext |
| Account required | ✓ No account needed | ~ Optional, adds features |
| Open source | ✓ | ✓ |
| Custom passphrase | ✓ | ✓ |
| Auto-expiry options | ✓ 5 min to 7 days | ✓ Up to 14 days (free), 30 days (paid) |
| Password generator | ✓ Built-in | ✗ |
| Passphrase generator | ✓ Diceware | ✗ |
| Free tier | ✓ Fully free, no account | ~ Free with account, paid for longer expiry |
| Automation | ✓ CLI + client-side SDK (zero-knowledge) | ✓ Server-side API (server sees secrets) |
| Self-hosting | ✓ | ✓ |
Where OneTimeSecret Has the Edge
Let us be fair about where OneTimeSecret offers something we do not (yet):
- Server-side API. OneTimeSecret offers a REST API for programmatic secret sharing. This is convenient for automation — but it requires the server to see your secrets in plaintext. 1time.io takes a different approach: a first-party CLI and client-side encryption that keeps secrets out of the server entirely.
- Established reputation. OneTimeSecret has been around longer and has a larger user base. That matters for trust.
- Custom branding on paid plans. Enterprise users can white-label the interface.
Where 1time.io Has the Edge
- True end-to-end encryption. The biggest differentiator. Your secrets are encrypted in the browser, not on the server. The server is cryptographically unable to read your data.
- No account wall. Full functionality with no signup. OneTimeSecret limits anonymous users to 25 characters.
- Built-in password and passphrase generators. Generate strong credentials and share them in one step.
- Completely free. No paid tiers, no feature limits, no character restrictions.
- Modern, clean interface. Built with a focus on simplicity and speed.
The Bottom Line
If you need enterprise features like custom branding, OneTimeSecret is a solid choice. But if your priority is maximum privacy and genuine zero-knowledge encryption, 1time.io has a fundamental architectural advantage: the server never sees your secrets, period. For automation, the 1time CLI lets you pipe secrets from your terminal with the same end-to-end encryption.
Both tools are open source, so you do not have to take our word for it. Read the code, verify the encryption implementation, and decide for yourself.
Switching is easy. There is no account to migrate, no data to transfer. Just bookmark 1time.io and start using it for your next secret share.
Frequently asked questions about 1time.io vs OneTimeSecret
What is the difference between 1time.io and OneTimeSecret?
The fundamental difference is where encryption happens. OneTimeSecret encrypts secrets on its server — meaning the server receives your plaintext before encrypting it, so the operator can read your secrets. 1time.io encrypts secrets in your browser using AES-GCM before anything leaves your device. The server only ever receives ciphertext it cannot decrypt. Both are open source and offer self-destructing links with no account required.
Does OneTimeSecret use end-to-end encryption?
No. OneTimeSecret uses server-side encryption, not end-to-end encryption. Your secret is sent in plaintext over HTTPS to the OneTimeSecret server, where it is encrypted and stored. The server has access to your plaintext during this process. 1time.io uses true end-to-end encryption — the secret is encrypted locally in your browser and the server never sees the plaintext.
Can the OneTimeSecret server read my secrets?
Yes, technically. Because OneTimeSecret encrypts secrets server-side, the server receives your plaintext before encrypting it. This means the operator, anyone with server access, or anyone with a legal order could access your unencrypted secrets. With 1time.io the server is cryptographically unable to read your data — encryption happens in the browser and the decryption key lives only in the URL fragment, which is never sent to the server.
Is 1time.io free compared to OneTimeSecret?
1time.io is completely free with no paid tiers, no feature limits, and no character restrictions. OneTimeSecret is also free for basic use, though longer expiry windows (up to 30 days) require a paid plan — the free tier caps at 14 days. 1time.io supports expiry from 5 minutes to 7 days on a single free tier with no account required.
Is 1time.io open source like OneTimeSecret?
Yes. Both 1time.io and OneTimeSecret are open source. 1time.io is MIT licensed and the full source code — including the encryption protocol — is available on GitHub. You can verify the encryption implementation, self-host the entire stack, or contribute to the project.
Which is better for developer automation: 1time.io or OneTimeSecret?
OneTimeSecret offers a server-side REST API, but because secrets are sent in plaintext to the server, the automation is not zero-knowledge. 1time.io offers a first-party CLI (`npm install -g @1time/cli`) that preserves end-to-end encryption: `printf "$SECRET" | 1time send`. The CLI also supports file sending and can be pointed at a self-hosted instance. For pipelines that require genuine zero-knowledge secret sharing, 1time.io is the better choice.
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