https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive.en A map of the feature flag and experimentation platform landscape in 2026. OpenFeature became the CNCF standard; LaunchDarkly remains the enterprise leader; Statsig bundles flags + experimentation + analytics; open source GrowthBook, Unleash, Flagsmith, and Bucketeer offer self-host paths; PostHog goes all-in-one (analytics + flags + replay); Hypertune brings TypeScript type safety; Vercel Edge Flags and Cloudflare Workers move evaluation to the edge; ConfigCat, Split (now Harness), DevCycle, Eppo, AB Tasty fill out the middle. We cover the patterns (kill switch, gradual rollout, A/B, multi-arm bandit, holdout), look at how Toss, Kakao, and Mercari run flags internally, and end with concrete picks per team profile. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) feature-flagsexperimentationab-testinglaunchdarklystatsiggrowthbookunleashconfigcatflagsmithposthogsplit-iodevcyclehypertuneopenfeaturecncf2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive.ja 2026年のフィーチャーフラグ／実験プラットフォーム地図。CNCF 標準として定着した OpenFeature、エンタープライズの定番 LaunchDarkly、flags + 実験 + 分析を束ねた Statsig、OSS の GrowthBook・Unleash・Flagsmith、オールインワン PostHog、TypeScript 型安全の Hypertune、Vercel Edge Flags・Cloudflare Workers、ConfigCat・Split・DevCycle・Eppo・Bucketeer まで。kill switch・gradual rollout・A/B・multi-arm bandit・holdout のパターン、トス・カカオ・メルカリの事例、そしてどのチームが何を選ぶべきかまで整理する。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) feature-flagsexperimentationab-testinglaunchdarklystatsiggrowthbookunleashconfigcatflagsmithposthogsplit-iodevcyclehypertuneopenfeaturecncf2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-feature-flags-experimentation-2026-launchdarkly-statsig-growthbook-unleash-posthog-openfeature-deep-dive 2026년 현재 피처 플래그/실험 플랫폼의 지도. CNCF 표준으로 자리 잡은 OpenFeature, 엔터프라이즈 리더 LaunchDarkly, flags + 실험 + 분석을 묶은 Statsig, 오픈소스 진영의 GrowthBook·Unleash·Flagsmith, all-in-one PostHog, TypeScript 타입 안전 Hypertune, Vercel Edge Flags·Cloudflare Workers, ConfigCat·Split·DevCycle·Eppo·Bucketeer까지. kill switch·gradual rollout·A/B·multi-arm bandit·holdout 패턴, 토스·카카오·메르카리 사례, 그리고 우리 팀이 무엇을 골라야 할지까지 정리한다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) feature-flagsexperimentationab-testinglaunchdarklystatsiggrowthbookunleashconfigcatflagsmithposthogsplit-iodevcyclehypertuneopenfeaturecncf2026deep-dive