Tinfoil alternatives
TL;DR: 12 companies doing similar work to Tinfoil in B2B, ranked by how closely they match what Tinfoil actually does — not just by category.
How this list was built: every company here is Y Combinator-backed and shares at least one category with Tinfoil. They are scored on how closely their own description overlaps with Tinfoil's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Tinfoil?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Unbound | Use AI tools without fear of data leakage | Summer 2024 | 7 | Active |
| Dyneti Technologies | Reduce payment fraud | Winter 2019 | 3 | Active |
| Hiro | Agents that handle security work | Summer 2023 | 2 | Active |
| PromptArmor | LLM Security and Compliance | Winter 2024 | — | Active |
| Sphere Secure Workspace | — | Summer 2015 | 2 | Acquired |
| Templarbit | Protecting applications from malicious activity | Summer 2017 | 11 | Acquired |
| Patchwork Security | Security patch notifications for servers. Build it, deploy it, and… | Winter 2016 | 2 | Inactive |
| Orgo | Computers for Agents | Fall 2026 | — | Active |
| Cryptoseal | Server key management, VPN as a Service, Privacy VPN. Sold to… | Summer 2011 | 3 | Acquired |
| Blyss | End-to-end encrypted AI. | Winter 2023 | 2 | Inactive |
Is Tinfoil still active?
Tinfoil is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Tinfoil. They are then ranked on how closely their own description overlaps with Tinfoil's, so the closest matches come first rather than whoever happens to share a tag.