Seald E2E Encryption SDK vs Stoffel: Side-by-Side Comparison (2026)

Seald E2E Encryption SDK: SDK for integrating client-side E2E encryption into web and mobile apps. built by Seald. Core capabilities include Client-side end-to-end encryption via sdk.encrypt() API, Zero-trust architecture — Seald servers cannot decrypt user data, Sig-Chain public key verification using Trust-On-First-Use (TOFU) to prevent MITM attacks..

Stoffel: Privacy-first app dev platform using MPC to compute on encrypted data. built by Stoffel. Core capabilities include Secure multi-party computation for encrypted data processing, Stoffel-Lang domain-specific language for privacy-preserving logic, StoffelVM runtime for executing computations on encrypted inputs..

Both serve the Data Security Posture Management market but differ in approach, feature depth, and target audience.

Seald E2E Encryption SDK differentiates with Client-side end-to-end encryption via sdk.encrypt() API, Zero-trust architecture — Seald servers cannot decrypt user data, Sig-Chain public key verification using Trust-On-First-Use (TOFU) to prevent MITM attacks. Stoffel differentiates with Secure multi-party computation for encrypted data processing, Stoffel-Lang domain-specific language for privacy-preserving logic, StoffelVM runtime for executing computations on encrypted inputs.

Seald E2E Encryption SDK is developed by Seald. Stoffel is developed by Stoffel. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Seald E2E Encryption SDK and Stoffel serve similar Data Security Posture Management use cases: both are Data Security Posture Management tools, both cover SDK. Review the feature comparison above to determine which fits your requirements.