| Price from | $29/mo | $0.01/mo |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 6 | 6 |
| Spec score · Social Media Listening Software | 8.2 (#18) | 8.5 (#9) |
| Audience | The site describes Stalkr as built for founders and positions its plans for solo founders, startup teams, agencies, and enterprise use. | Synthesio describes its platform and services for brands, agencies, and business teams seeking consumer insights. |
| Integrations | Stalkr offers a versioned REST API, an authenticated MCP server, and signed webhooks, and names ChatGPT, Claude, and Codex as agent clients. | Its privacy policy names Google, YouTube, X/Twitter, Meta and Reddit APIs; integrations can require API keys and Synthesio says it does not store third-party passwords. |
| Security | The privacy policy lists TLS in transit, database encryption at rest, API key secret rotation, least-privilege team access, and authentication rate limits as safeguards. | Synthesio's API supports creating and revoking OAuth 2.0 tokens associated with user permissions and managing users and their permissions. |
| Sentiment analysis | Yes | Yes |
| Support | The privacy policy gives [email protected] as a contact for policy and data questions. | The company offers expert consultation, supported sourcing and setup, customized reports, and advisory services as service options. |