# Best AgentMail alternatives > Email inbox API for AI agents. Provision inboxes with one API call, then send, receive, and thread messages with Python and TypeScript SDKs. SOC 2 Type II. Top AgentMail alternatives on usedby: Braintrust (44 public customers), LangSmith (43 public customers) and Arize AI (37 public customers). 4 of the 13 AgentMail customers on usedby also use one of them. Every public proof counts, from case studies to job posts: confirmed (a case study, a named quote, a press release, or the company's own public account of using the tool (its own site, or a post by one of its executives, VP or above)), observed (the vendor’s customer page) and signal (a job post, the weakest proof). Each line keeps its level. Latest check 2026-10-25: 415 of 426 public lines checked. Last updated 2026-10-25. Tool page: https://www.usedby.ai/tools/agentmail.md ## Alternatives Tools of the same or a competing category ([Agent frameworks & AI gateways](https://www.usedby.ai/tools/category/llm-ops-frameworks.md)), from another vendor. Ranked by public customers (every proof level, job posts included), then by confirmed, then by observed ones. Shared customers use both tools; they never set the order. Pricing and free trial: what the vendor states on its own pages, verified; “Not checked yet” when usedby has no verified value; the vendor may publish it. | Rank | Tool | Public customers | Confirmed / observed / signals | Shared with AgentMail | Most common industry | Pricing | Free trial | Compare | |---|---|---|---|---|---|---|---|---| | 1 | [Braintrust](https://www.usedby.ai/tools/braintrust.md) | 44 | 13 / 30 / 1 | 2 | DevTools & Infrastructure (12) | free plan and paid tiers (https://www.braintrust.dev/pricing) | Yes (https://www.braintrust.dev/pricing) | https://www.usedby.ai/compare/agentmail-vs-braintrust.md | | 2 | [LangSmith](https://www.usedby.ai/tools/langsmith.md) | 43 | 0 / 42 / 1 | 2 | — | free plan and paid tiers (https://www.langchain.com/pricing) | Yes (https://www.langchain.com/pricing) | https://www.usedby.ai/compare/agentmail-vs-langsmith.md | | 3 | [Arize AI](https://www.usedby.ai/tools/arize-ai.md) | 37 | 9 / 28 / 0 | 0 | — | Not checked yet | Yes (https://arize.com/pricing/) | — | | 4 | [LangChain](https://www.usedby.ai/tools/langchain.md) | 35 | 0 / 31 / 4 | 2 | — | free plan and paid tiers (https://www.langchain.com/pricing) | Yes (https://www.langchain.com/pricing) | https://www.usedby.ai/compare/agentmail-vs-langchain.md | | 5 | [TrueFoundry](https://www.usedby.ai/tools/truefoundry.md) | 27 | 12 / 15 / 0 | 0 | Artificial Intelligence (6) | free plan and paid tiers (https://www.truefoundry.com/pricing) | Yes (https://www.truefoundry.com/pricing) | — | | 6 | [E2B](https://www.usedby.ai/tools/e2b.md) | 25 | 12 / 13 / 0 | 0 | Artificial Intelligence (16) | Not checked yet | Yes (https://e2b.dev/pricing) | — | | 7 | [Portkey](https://www.usedby.ai/tools/portkey.md) | 22 | 4 / 18 / 0 | 0 | Artificial Intelligence (5) | Not checked yet | Yes (https://portkey.ai/pricing) | — | | 8 | [Browserbase](https://www.usedby.ai/tools/browserbase.md) | 21 | 0 / 21 / 0 | 1 | Artificial Intelligence (7) | Not checked yet | Yes (https://www.browserbase.com/pricing) | https://www.usedby.ai/compare/agentmail-vs-browserbase.md | | 9 | [CrewAI](https://www.usedby.ai/tools/crewai.md) | 18 | 5 / 13 / 0 | 0 | — | Not checked yet | Yes (https://crewai.com/pricing) | — | | 10 | [Comet Opik](https://www.usedby.ai/tools/comet-opik.md) | 17 | 10 / 7 / 0 | 0 | Artificial Intelligence (4) | free plan and paid tiers (https://www.comet.com/site/pricing/) | Yes (https://www.comet.com/site/pricing/) | — | ## More tools of this category Same or competing category, from another vendor, after the ranking above: fewer public customers. - [Mem0](https://www.usedby.ai/tools/mem0.md): 16 customers - [OpenRouter](https://www.usedby.ai/tools/openrouter.md): 16 customers - [Mindset AI](https://www.usedby.ai/tools/mindset.md): 15 customers - [Kernel](https://www.usedby.ai/tools/kernel.md): 14 customers - [Galileo](https://www.usedby.ai/tools/galileo.md): 14 customers - [Flowise](https://www.usedby.ai/tools/flowise.md): 13 customers - [Fiddler AI](https://www.usedby.ai/tools/fiddler-ai.md): 12 customers - [Manufact](https://www.usedby.ai/tools/manufact.md): 10 customers - [Contextual AI](https://www.usedby.ai/tools/contextual-ai.md): 7 customers - [Vectara](https://www.usedby.ai/tools/vectara.md): 7 customers ## Best AgentMail alternative by industry In the industries where AgentMail has the most public customers, the alternative with the most public customers of its own (at least three, every proof level). - [DevTools & Infrastructure](https://www.usedby.ai/companies/industry/devtools-infrastructure.md): [Braintrust](https://www.usedby.ai/tools/braintrust.md), 12 public customers (AgentMail: 2) - [Sales Tech & CRM](https://www.usedby.ai/companies/industry/sales-tech-crm.md): [Braintrust](https://www.usedby.ai/tools/braintrust.md), 3 public customers (AgentMail: 2) - [Artificial Intelligence](https://www.usedby.ai/companies/industry/artificial-intelligence.md): [E2B](https://www.usedby.ai/tools/e2b.md), 16 public customers (AgentMail: 1) - [Fintech & Payments](https://www.usedby.ai/companies/industry/fintech-payments.md): [Braintrust](https://www.usedby.ai/tools/braintrust.md), 5 public customers (AgentMail: 1) Switches between tools are not published: naming a switch would name a departure, and usedby hides lines a vendor stops showing. ## Questions ### What are the best AgentMail alternatives? Ranked by their public customers on usedby: Braintrust (44 customers), LangSmith (43 customers), and Arize AI (37 customers). ### Which AgentMail alternatives offer a free trial? Braintrust, LangSmith, and Arize AI offer a free trial or a free plan, according to their own pricing pages. ### What is the best AgentMail alternative for DevTools & Infrastructure companies? Braintrust, with 12 customers in DevTools & Infrastructure on usedby. AgentMail has 2 there. ### What is the best AgentMail alternative for Sales Tech & CRM companies? Braintrust, with 3 customers in Sales Tech & CRM on usedby. AgentMail has 2 there. ### Do AgentMail customers use other tools too? 4 of the 13 AgentMail customers on usedby also use another tool on this list. Braintrust shares the most: 2. ### How does usedby rank AgentMail alternatives? Only tools of the same or a competing category, from another vendor, count. They are ranked by their public customers at every proof level, job posts included; a tie goes to the stronger proofs (more confirmed, then more observed). Each tool shows its mix: confirmed (a case study, a press release), observed (the vendor’s customer page), signal (a job post, the weakest proof). Shared customers are shown for information and never set the order. Tools of other categories that the same companies use are listed apart, as tools used with AgentMail. usedby does not publish departures, so no company is shown switching from AgentMail to another tool. --- Source: https://www.usedby.ai/alternatives/agentmail · How we check: https://www.usedby.ai/methodology