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Rystic
Rystic builds local, stateful simulators of third-party APIs for training and testing agents. The simulators are validated against live services and can be reset, manipulated, and broken.
- Founded
- Not disclosed
- Headquarters
- Not disclosed
- Company size
- 1–10
- Products tracked
- 1
Products by Rystic
Pricing for Rystic
Free, Freemium, Subscription, Usage Based, Per Seat, Tiered, Enterprise Custom
This is the broad commercial model reported for Rystic. Product-level terms are listed below when available.
- Pricing model
- Free, Freemium, Subscription, Usage Based, Per Seat, Tiered, Enterprise Custom
- Entry option
- Free plan and Free trial
- Starting price
- Free — $0
Trust profile
Security and compliance
No compliance claims have been published for this company.
Local simulator execution; Enterprise builds can run offline
Simulator usage reports do not include served request or response contents, hostnames, usernames, or simulated-service users and data
Tokens are not stored directly; Rystic stores token labels, prefixes, and SHA-256 hashes
Call archives are stored privately and encrypted
Google and GitHub sign-in are supported through Clerk
Latest updates from Rystic
Research
Rystic reports new Fidelity validation results for Slack and GitHub simulators
Rystic’s Fidelity page reports updated validation results for its Slack and GitHub simulators against the corresponding real APIs. The Slack simulator recorded a 96.7% match rate across 538 probes, with 204 of 210 workflows passing end to end. The GitHub simulator recorded a 91.5% match rate across 468 probes, with 290 of 320 workflows passing. The verification rounds were dated October 16, 2026.
IntegrationSlackIntegrationGitHub, Inc.
New feature
Rystic launches CLI for simulator installation and management
Rystic introduced a command-line interface for installing, authenticating, running, updating, and monitoring its simulators. The CLI supports macOS and Linux, with a Windows archive available on request, and includes Docker and Compose workflows, offline documentation, simulator health checks, stack management, event streaming, export to pinned Compose files or Antithesis scaffolds, and simulator-specific features such as replay and live feeds for the Kalshi simulator.
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