Not Diamond vs TrueFoundry
Both are llm gateways tools. Here is how they actually differ on price, billing model and deployment.
Not Diamond
A model router that recommends rather than proxies - it tells your gateway which model to call and gets out of the way. That architecture means no request-path dependency, which nothing else in this category offers.
TrueFoundry
An enterprise AI gateway fronting 250+ models with on-prem deployment and a free developer tier. Worth knowing that it also publishes the competitor pricing guides that rank highly for its rivals' names.
| Not Diamond | TrueFoundry | |
|---|---|---|
| Category | LLM Gateways | LLM Gateways |
| Our rating | 4/5 | 4/5 |
| Starting price | Conflicting reports | $499/mo |
| Billing meter | No usage metering | request |
| Free plan | Yes | Yes |
| Free self-hosting | No or paid tier only | No or paid tier only |
| Best for | Teams already running a gateway who want smarter per-request model selection without putting another vendor in the request path, particularly for coding agents where model spend is high and uncontrolled. | Enterprises that need an AI gateway deployable on-premise or in their own cloud with governance features, and that want a managed product rather than operating open-source infrastructure. |
Our verdict on Not Diamond
Not Diamond is architecturally the most interesting thing in this category because it declines to be a gateway. Integrations are stack-agnostic through its API, and recommendations are executed in your own model gateway and harness - so it tells you which model to call and gets out of the way. Every other router in this category is a proxy, which means adopting it creates a request-path dependency and a new availability risk. Not Diamond has neither. It composes with LiteLLM, Vercel, Cloudflare or your own proxy rather than replacing any of them, which makes it unusually low-commitment to try. The product is a pre-trained Chat router, a Code router aimed at coding-agent cost currently in early access, and custom routers trained on your own data. That last one matters most, because the weakness of generic routing is that your workload is not the benchmark it was tuned on. The unsatisfying part is pricing, where sources directly contradict each other, and the fact that the most differentiated capability is still early access.
Full Not Diamond review →Our verdict on TrueFoundry
TrueFoundry is a credible enterprise AI gateway with one capability that genuinely distinguishes it - it deploys on-premise and in your own cloud, not just as SaaS. For regulated organisations that cannot route prompts through a third party but also do not want to own an open-source proxy outright, that middle position is valuable and few competitors occupy it. Native MCP support and semantic caching are both ahead of most of the field, and the free Developer tier at 50,000 requests a month is a real trial. The company looks solid, having raised over $21 million from Intel Capital, Eniac Ventures and Peak XV, appeared in Gartner's 2026 Hype Cycle for Platform Engineering, and acquired Seldon AI. One thing worth knowing as a reader rather than a buyer. TrueFoundry publishes detailed pricing guides for LiteLLM, Portkey, LangChain and others, and those articles rank well for competitor searches. They are reasonable content, but they are competitor marketing, and if you have been researching gateway pricing you have probably read several without noticing whose site you were on.
Full TrueFoundry review →Frequently Asked Questions
What is the main difference between Not Diamond and TrueFoundry?
Not Diamond: Teams already running a gateway who want smarter per-request model selection without putting another vendor in the request path, particularly for coding agents where model spend is high and uncontrolled. TrueFoundry: Enterprises that need an AI gateway deployable on-premise or in their own cloud with governance features, and that want a managed product rather than operating open-source infrastructure. Both sit in LLM Gateways, so the decision usually comes down to billing model and deployment rather than raw capability.
Which is cheaper, Not Diamond or TrueFoundry?
It depends entirely on your workload shape, because they meter differently - Not Diamond bills on no usage metering and TrueFoundry bills on request. Published starting prices are Conflicting reports and $499/mo respectively, but those numbers are not comparable until you apply them to the same traffic. Use our cost calculator to model both against your own request volume and span count.
Can I self-host Not Diamond or TrueFoundry?
Not Diamond: No or paid tier only. TrueFoundry: No or paid tier only. Free self-hosting means no licence fee, not no cost - you still own the infrastructure, upgrades and on-call.