# Rystic blog

Notes from the team building Rystic's API simulators.

- [Rystic launches on YC: test your agents against local copies of Slack, Stripe and Google Drive](https://www.rystic.ai/blog/rystic-launches-on-yc.md) — 2026-10-26, Evan Whitehouse and Zachary Kiihne. Rystic gives your agent working copies of the tools it acts on, so tests check what it did, not just what it said. Our launch post from Launch YC.
- [Deep dive: Stripe simulator vs mock vs sandbox](https://www.rystic.ai/blog/stripe-mock-sandbox-or-simulator.md) — 2026-10-25, Henry Starman. Stripe offers a sandbox for fidelity and stripe-mock for isolation, but CI needs both. We tested three tools on two real Stripe workflows and a stress test.

---

Source: https://www.rystic.ai/blog · RSS: https://www.rystic.ai/blog/rss.xml