swob - RelaySMS
Overview
• RelaySMS – also marketed as swob (SMS Without Borders) – is a lightweight, cross‑platform utility that enables users to compose and dispatch SMS messages securely even when an active internet connection is unavailable.
• By leveraging locally cached OAuth2 credentials stored in encrypted online vaults, the application bridges the gap between modern cloud services (Gmail, Twitter, Telegram) and traditional cellular messaging.
Core Functionality
• OAuth2 Token Management – Securely saves and refreshes tokens for Gmail, Twitter, and Telegram, allowing the app to act on behalf of the user without re‑authenticating each session.
• Multiple Account Support – Users can add, label, and switch between several accounts per service, making it easy to handle personal and professional identities from a single interface.
• Message Dispatch – Sends SMS directly from the stored credentials; the recipient sees a standard text message, while the sender’s service handles delivery through the carrier network.
• Optional Authenticated Number – Offers the choice to attach an authentication phone number to outgoing messages or to omit it for fully anonymous delivery, depending on privacy needs.
Security & Privacy
• Encrypted Vaults – All OAuth2 tokens are encrypted at rest using industry‑standard AES‑256 encryption; decryption keys are derived from the user’s master password, which never leaves the device.
• Zero‑Knowledge Architecture – The service provider cannot read or alter stored credentials; only the client device can decrypt them.
• Offline Capability – Once tokens are cached, the app can operate entirely offline, preventing any exposure of credentials over the network.
Open‑Source Availability
• The complete source code is released under an OSI‑approved license and hosted on GitHub: https://github.com/smswithoutborders.
• Community contributions are encouraged; issues, pull requests, and documentation improvements are openly managed.
Ideal Use Cases
• Field workers in remote locations with intermittent connectivity.
• Journalists or activists requiring discreet, reliable communication.
• Enterprises needing a fallback messaging channel when corporate networks fail.
RelaySMS thus provides a dependable, secure bridge between cloud‑based communication platforms and the universal reach of SMS, ensuring messages get through regardless of internet availability.
FAQ
Q: How does the app manage OAuth2 tokens for the supported services?
A: When you first link an account (Gmail, Twitter, or Telegram), swob obtains an OAuth2 access token and a refresh token. Both are encrypted with AES‑256 and stored in an online vault that only your device can decrypt. The app automatically refreshes tokens when they expire, so you never need to re‑authenticate unless you deliberately revoke access from the service’s security settings.
Q: Can I use more than one account per service, and how do I keep them organized?
A: Yes. swob lets you add multiple accounts for each supported service. Each account can be given a custom label (for example, “Work Gmail” or “Personal Twitter”) which appears in the account‑switcher. Switching between accounts is instantaneous and does not require re‑entering passwords, because the encrypted tokens are already cached on your device.
Q: What happens if I lose internet connectivity after I have added my accounts?
A: Once the OAuth2 tokens are cached and encrypted on your device, swob can operate completely offline. You can still draft messages, select a cached account, and queue the SMS for delivery. When the device regains a network connection, the app automatically contacts the appropriate cloud service and sends the queued messages.
Version History
v0.40.0——27 Aug 2026
Communicate with online services using SMS messaging Download the latest version of swob - RelaySMS to enjoy new features and updates immediately!
*0.40.0
Minor bug fixes and improvements. Install or update to the newest version to check it out!
*0.39.0
Minor bug fixes and improvements. Install or update to the newest version to check it out!
*0.38.0
Minor bug fixes and improvements. Install or update to the newest version to check it out!
