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 https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive.en A May 2026 map of the product analytics, A/B testing, and CDP ecosystem in one place. Covers Mixpanel (long-time leader), Amplitude (expanding into experimentation), PostHog (open-source all-in-one), Heap (autocapture), Pendo (adoption), Contentsquare (which acquired Hotjar), Fullstory (session replay), Optimizely, VWO, Statsig, GrowthBook; the privacy-first camp of Plausible, Fathom, Umami, Matomo, Simple Analytics; the CDPs Segment (Twilio), RudderStack, and Snowplow; plus the 2026 AI features in Mixpanel Spark, Amplitude Audience GenAI, and PostHog AI. Includes Korean (Toss, Kakao) and Japanese (Mercari, AbemaTV) case studies and a decision guide from solo developers through enterprise. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) product-analyticsab-testingmixpanelamplitudeposthogheappendohotjarcontentsquarefullstoryoptimizelyvwostatsiggrowthbookplausiblefathomumamimatomosegmentrudderstacksnowplow2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive.ja 2026年5月時点のプロダクト分析・A/B テスト・CDP エコシステムを一気にまとめます。Mixpanel(長年のリーダー)、Amplitude(実験領域へ拡大)、PostHog(オープンソースのオールインワン)、Heap(自動キャプチャ)、Pendo(採用)、Contentsquare(Hotjar 買収)、Fullstory(セッションリプレイ)、Optimizely、VWO、Statsig、GrowthBook、プライバシー優先の Plausible・Fathom・Umami・Matomo・Simple Analytics、CDP の Segment(Twilio)・RudderStack・Snowplow、そして Mixpanel Spark・Amplitude Audience GenAI・PostHog AI など 2026 年の AI 機能までを網羅。韓国(トス・カカオ)と日本(メルカリ・AbemaTV)の事例、ソロ開発者からエンタープライズまでの意思決定ガイドも付属。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) product-analyticsab-testingmixpanelamplitudeposthogheappendohotjarcontentsquarefullstoryoptimizelyvwostatsiggrowthbookplausiblefathomumamimatomosegmentrudderstacksnowplow2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-product-analytics-ab-testing-2026-mixpanel-amplitude-posthog-heap-pendo-optimizely-plausible-deep-dive 2026년 5월 기준 제품 분석·A/B 테스트·CDP 생태계를 한 번에 정리합니다. Mixpanel(오랜 리더)·Amplitude(실험으로 확장)·PostHog(오픈소스 올인원)·Heap(자동 추적)·Pendo(채택)·Contentsquare(Hotjar 인수)·Fullstory(세션 리플레이)·Optimizely·VWO·Statsig·GrowthBook, 프라이버시 우선의 Plausible·Fathom·Umami·Matomo·Simple Analytics, CDP의 Segment(Twilio)·RudderStack·Snowplow, 그리고 Mixpanel Spark·Amplitude Audience GenAI·PostHog AI 같은 2026년 AI 기능까지. 한국(토스·카카오)과 일본(메르카리·AbemaTV) 사례, 그리고 1인 개발자부터 엔터프라이즈까지 의사결정 가이드를 제공합니다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) product-analyticsab-testingmixpanelamplitudeposthogheappendohotjarcontentsquarefullstoryoptimizelyvwostatsiggrowthbookplausiblefathomumamimatomosegmentrudderstacksnowplow2026deep-dive