Aperture Sectors › AI Developer Tools › Evaluation & observability
Evaluation & observability funding
Evaluation & observability
A sub-sector of AI Developer Tools. Each company counts once, in its main sub-sector.
104 rounds, $2.9B raised by 85 companies, Jan 2, 2023 to Nov 14, 2026, 14% of AI Developer Tools capital. Top three companies: LangChain 16%, Arena 16%, Coralogix 11%.
| Company | HQ | Capital raised | Rounds | Exit |
|---|---|---|---|---|
| LangChain | United States | $450M | 3 | — |
| Arena | United States | $450M | 3 | — |
| Coralogix | United States | $315M | 2 | — |
| Observe | United States | $271M | 2 | Acquired |
| Dash0 | United States | $145M | 2 | — |
| groundcover | Israel | $135M | 2 | — |
| Tessl | United Kingdom | $100M | 1 | — |
| Braintrust | United States | $80M | 1 | — |
| Arize AI | United States | $70M | 1 | — |
| Raindrop | United States | $50M | 2 | — |
| Fiddler AI | United States | $49M | 2 | — |
| Tsuga | France | $45M | 2 | — |
| Galileo | United States | $45M | 1 | Acquired |
| Vals AI | United States | $40M | 1 | — |
| Silicon Data | United States | $35M | 2 | — |
| Opsera | United States | $32M | 2 | — |
| Coval | United States | $31M | 3 | — |
| Distributional | United States | $30M | 2 | — |
| Crash Override | United States | $28M | 1 | — |
| Eppo | United States | $28M | 1 | Acquired |
| Pramaana Labs | United States | $27M | 1 | — |
| Tolmo | United States | $22M | 1 | — |
| Faros AI | United States | $20M | 1 | — |
| Openlayer | United States | $19M | 2 | — |
| Phoebe | United Kingdom | $17M | 1 | — |
| Company | Amount | Stage | Announced |
|---|---|---|---|
| LangChain | $300M | Series C | Nov 12, 2026 |
| Arena | $200M | Series B | Oct 8, 2026 |
| Coralogix | $200M | Series F+ | Jun 3, 2026 |
| Observe | $156M | Series C | Jul 30, 2025 |
| Arena | $150M | Series A | Jan 6, 2026 |
| LangChain | $125M | Series B | Oct 20, 2025 |
| Coralogix | $115M | Series E | Jun 17, 2025 |
| Observe | $115M | Series B | Mar 27, 2024 |
| Dash0 | $110M | Series B | Mar 23, 2026 |
| groundcover | $100M | Series C | Jul 29, 2026 |