Inngest

Inngest is an open source durable execution platform for background jobs, workflows and AI agents. Developers wrap functions in steps using one SDK, and Inngest handles retries, queuing and state, so long running or failure prone code keeps going without separate infrastructure. It is aimed at backend and AI engineers who orchestrate asynchronous code. Functions can be triggered by events and can pause, fan out, defer and retry. Observability is built in, with traces for every job, agent and event from trigger to completion. Flow control keeps users from starving each other when they compete for the same resource, replacing hand written rate limits. Sandboxes let teams run a new prompt, model or code path on the same triggers and data as production and compare results before release. A/B testing and scoring capture which variant of an agent performed better. Developers can start locally by installing the SDK from npm and move to the hosted cloud for production. Pricing is published in tiers. Free is $0 a month with no credit card, and includes 5 seats, 50 thousand executions and 24 hour trace history. Pro starts at $99 a month with 15 seats and 1 million executions. Business starts at $499 a month with 30 seats and 10 million executions. Enterprise is custom priced through the sales team. Sandbox compute is billed by usage, listed at $0.000011 per vCPU second and $0.000003 per GB of memory second.