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Dev tools · June 11, 2018

WB

We Built and Open Sourced a Feature Flagging Platform

Hi. We just open sourced Bullet Train, a Feature Flag and Remote Config platform. It's a collection of tools: server API, admin front end and clients for a bunch of different platforms. Together they allow you to control feature flags and remote config across projects, environments and users. We realised that we were building ad-hoc feature flag stuff into individual projects over and over, so we had a look around to see if there was a way of doing this in a more formal manner. There are a few commercial solutions around but they were quite expensive and seemed to be aimed more at the…

We Built and Open Sourced a Feature Flagging Platform launched on June 11, 2018 with 11 votes, #859 of 2,653 launches that month and more than 75% of that year's launches.

Alternatives

In plain words

Bullet Train is an open-source feature flagging and remote configuration platform consisting of a server API, admin interface, and client libraries for multiple platforms. It enables developers to manage feature flags and remote config settings across projects, environments, and users from a centralized location. Designed for startups and development agencies, the platform can be self-hosted or used via free hosted services, offering a cost-effective alternative to expensive enterprise solutions.

written from the facts on this page · September 2026

From the sources

In the maker’s words, at launch

Hi. We just open sourced Bullet Train, a Feature Flag and Remote Config platform. It's a collection of tools: server API, admin front end and clients for a bunch of different platforms. Together they allow you to control feature flags and remote config across projects, environments and users. We realised that we were…

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Source: Show HN post ↗ · launch text quoted in part

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