Sonnet alternatives
TL;DR: 12 companies doing similar work to Sonnet in B2B, ranked by how closely they match what Sonnet 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 Sonnet. They are scored on how closely their own description overlaps with Sonnet's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Sonnet?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Champ | AI SDR | Summer 2022 | 1 | Active |
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Relate | All-in-One Sales and Marketing CRM for B2B teams | Summer 2022 | 7 | Active |
| Infer | Operating system for insurance agencies | Summer 2021 | 9 | Active |
| BlitzIQ | Note taking workspace for B2B sales teams | Winter 2019 | — | Inactive |
| Sherpa Labs | Frontier Data | Winter 2025 | 5 | Active |
| Slik | Slik automates your sales. | Summer 2017 | 2 | Inactive |
| Convex | Software for the commercial services industry. | Winter 2019 | 110 | Acquired |
| Close | CRM and sales automation suite | Winter 2011 | 130 | Active |
| Cascade | Distilling Proprietary Intelligence | Winter 2026 | 2 | Active |
| Demodesk | AI-powered sales coaching | Winter 2019 | 25 | Active |
Is Sonnet still active?
Sonnet is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Sonnet. They are then ranked on how closely their own description overlaps with Sonnet's, so the closest matches come first rather than whoever happens to share a tag.