Sendsafe VS Diffyn

Sendsafe's answer

Sendsafe is one of the few file transfer services that genuinely stores your files in the UK, on independent infrastructure — not on Amazon, Google, or Microsoft's cloud. Many competitors claim "European" or "UK-based" but actually run on AWS regions owned by US companies, which means data is subject to the US CLOUD Act regardless of where the servers physically sit.

Key differentiators:

• 10 GB free transfers — five times WeTransfer's free tier
• No account required for senders or recipients
• True UK data sovereignty — files stored on UK infrastructure, not on a US hyperscaler's EU region
• No AI training on user files, ever
• AES-256 encryption in transit and at rest
• Auto-delete when files expire — no permanent storage
• Password protection and download limits available on every transfer

Diffyn's answer:

Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.

Sendsafe's answer

If you care about where your files actually live, SendSafe is one of the only options that gives you a straight answer. WeTransfer, Smash, and most other "European" file transfer services run on AWS or other US-hyperscaler infrastructure — your data sits on Amazon's servers in Ireland or Frankfurt, owned and operated by a US company.

Sendsafe runs on Fasthost's UK data centres, which means your files are genuinely on British infrastructure, independent of the major US cloud providers.

Other practical advantages:

• Larger free file size limit (10 GB vs WeTransfer's 2 GB)
• No account creation for senders or recipients — just upload and share
• No advertising shown to your recipients
• Clear retention controls so you know when files are deleted
• No data used for AI training

Diffyn's answer:

Diffyn is the platform that specializes on both change management and multi-model analysis.

Sendsafe's answer

• Storage: IONOS \ Fasthosts UK data centres
• Encryption: AES-256 for files at rest, TLS for files in transit
• Backend: Node.js
• Web server: nginx
• Database: SQLite with WAL mode for metadata
• Infrastructure: UK-hosted VPS

Diffyn's answer:

React, Next.js, POSTGRESQL

Sendsafe's answer

Sendsafe is built for UK businesses and individuals who need to send large files without compromising on data privacy or sovereignty:

• Professional services firms (law, accountancy, surveying, architecture) handling sensitive client documents
• Designers, photographers, and creative agencies sending large project files to clients
• Healthcare and education professionals with GDPR and data residency obligations
• Privacy-conscious individuals who don't want their files used for AI training or stored on US-hyperscaler infrastructure
• Anyone who's previously used WeTransfer but wants stronger guarantees about where data lives and how it's used

Diffyn's answer:

Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.

Sendsafe's answer

Sendsafe is a UK backup and storage business that has been providing secure cloud infrastructure to MSPs and businesses since the early 2010s.

The team noticed two things: first, that file transfer services had become casual about where data is stored and what's done with it — WeTransfer's 2025 changes to its terms of service highlighted the risk. Second, that the major "alternatives" mostly run on the same US hyperscaler infrastructure they claim to be different from.

Sendsafe was created to offer a straightforward, honest alternative: genuinely UK-stored, encrypted, auto-deleted, no account required, no AI training. The same secure storage infrastructure BOBcloud trusts with its enterprise backup customers, available free for everyday file transfers.

Diffyn's answer:

I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.

Sendsafe's answer

Sendsafe is a free service and we don't track or identify individual users — that's part of the privacy promise.