https://www.kiniinsight.com/en/ Notes from building mobile apps - the parts that broke, what the fix actually was, and the tools behind it. Written from what I ran, not from memory. en Mon, 24 Aug 2026 00:00:00 GMT https://www.kiniinsight.com/en/posts/2026-08-24-we-logged-every-screen-and-still-could-not-say-where-users-left/ https://www.kiniinsight.com/en/posts/2026-08-24-we-logged-every-screen-and-still-could-not-say-where-users-left/ Mon, 24 Aug 2026 00:00:00 GMT Screen tracking was firing, yet the funnel question stayed unanswerable. The data landed where I could not query it, and one step I added would read 100% forever. funnel analytics Mixpanel Firebase Analytics instrumentation https://www.kiniinsight.com/en/posts/2026-08-21-one-line-changed-and-git-recorded-295/ https://www.kiniinsight.com/en/posts/2026-08-21-one-line-changed-and-git-recorded-295/ Fri, 21 Aug 2026 00:00:00 GMT When line endings flip from LF to CRLF, git treats every line as modified. Measured numbers for the diff, the blame damage, and why -w beats --ignore-rev. git CRLF line endings gitattributes code review https://www.kiniinsight.com/en/posts/2026-08-21-wiring-subscriptions-the-full-play-store-and-revenuecat-checklist/ https://www.kiniinsight.com/en/posts/2026-08-21-wiring-subscriptions-the-full-play-store-and-revenuecat-checklist/ Fri, 21 Aug 2026 00:00:00 GMT Every step of attaching subscriptions to an Android app, in order, with the specific places it silently breaks and how to tell which layer failed. subscriptions in-app purchases RevenueCat Google Play Android https://www.kiniinsight.com/en/posts/2026-08-20-most-of-the-work-in-shipping-in-app-subscriptions-was-not-code/ https://www.kiniinsight.com/en/posts/2026-08-20-most-of-the-work-in-shipping-in-app-subscriptions-was-not-code/ Thu, 20 Aug 2026 00:00:00 GMT Wiring in-app subscriptions blocked three releases in one day. Every blocker was a name or a scope that had to match across two systems, and none of them errored. in-app subscriptions RevenueCat Google Play Android permissions Firestore https://www.kiniinsight.com/en/posts/2026-08-19-what-makes-an-llm-call-cacheable-is-not-temperature/ https://www.kiniinsight.com/en/posts/2026-08-19-what-makes-an-llm-call-cacheable-is-not-temperature/ Wed, 19 Aug 2026 00:00:00 GMT Caching an LLM call looked trivial until I checked why it was safe. The reason I reached for first was wrong, and partial hits corrupted the totals. LLM caching API cost Firestore system design https://www.kiniinsight.com/en/posts/2026-08-18-the-design-tokens-existed-the-code-just-did-not-use-them/ https://www.kiniinsight.com/en/posts/2026-08-18-the-design-tokens-existed-the-code-just-did-not-use-them/ Tue, 18 Aug 2026 00:00:00 GMT An app with design tokens still had 953 hardcoded colors, and 349 of them were values the tokens already defined. Automating the swap went wrong twice. design tokens design systems refactoring codemod react-native https://www.kiniinsight.com/en/posts/2026-08-17-uniq-says-two-different-korean-lines-are-duplicates/ https://www.kiniinsight.com/en/posts/2026-08-17-uniq-says-two-different-korean-lines-are-duplicates/ Mon, 17 Aug 2026 00:00:00 GMT On macOS, uniq reports duplicates that do not exist in non-Latin text. It collapsed 397 distinct lines into one. The cause is collation, and uniq never signals it. uniq shell unicode locale macos https://www.kiniinsight.com/en/posts/2026-08-17-what-people-searching-for-the-miracle-morning-actually-ask/ https://www.kiniinsight.com/en/posts/2026-08-17-what-people-searching-for-the-miracle-morning-actually-ask/ Mon, 17 Aug 2026 00:00:00 GMT I measured 40 morning routine autocomplete suggestions. Eight ask about side effects and failure, and the real question underneath is whether sleeping less is fine. morning routine sleep habits search data self improvement https://www.kiniinsight.com/en/posts/2026-08-16-a-working-widget-preview-does-not-mean-a-working-widget/ https://www.kiniinsight.com/en/posts/2026-08-16-a-working-widget-preview-does-not-mean-a-working-widget/ Sun, 16 Aug 2026 00:00:00 GMT I shipped the same broken Android widget four times. The preview looked right and the build passed, but adding it to the home screen failed every time. Android widgets RemoteViews app development debugging https://www.kiniinsight.com/en/posts/2026-08-16-people-searching-for-repeated-failure-are-already-counting/ https://www.kiniinsight.com/en/posts/2026-08-16-people-searching-for-repeated-failure-are-already-counting/ Sun, 16 Aug 2026 00:00:00 GMT I measured 36 autocomplete suggestions for a Korean phrase about broken habits. Three ask how to fix it. Five assume it already happened again. habits search data product copy motivation app development https://www.kiniinsight.com/en/posts/2026-08-15-four-of-five-keywords-died-on-intent/ https://www.kiniinsight.com/en/posts/2026-08-15-four-of-five-keywords-died-on-intent/ Sat, 15 Aug 2026 00:00:00 GMT I picked five topics by search volume and dropped four an hour later. Reading the ranking pages showed the search intent behind those words was different. search intent SEO keyword research content strategy blogging https://www.kiniinsight.com/en/posts/2026-08-15-my-type-check-was-silent-not-passing/ https://www.kiniinsight.com/en/posts/2026-08-15-my-type-check-was-silent-not-passing/ Sat, 15 Aug 2026 00:00:00 GMT I judged TypeScript by grepping tsc output for a string it never prints. It stayed silent every time, and I read silence as success. Six real errors were hiding. typescript tsc CI shell verification https://www.kiniinsight.com/en/posts/2026-08-15-study-planner-means-three-different-things/ https://www.kiniinsight.com/en/posts/2026-08-15-study-planner-means-three-different-things/ Sat, 15 Aug 2026 00:00:00 GMT The phrase study planner returns a consultant, a paper notebook, and an app in one page of results. Decide which you want, or you buy whichever had the best ad. study planner study planning planner comparison self management productivity https://www.kiniinsight.com/en/posts/2026-08-15-the-index-deployed-and-the-error-stayed/ https://www.kiniinsight.com/en/posts/2026-08-15-the-index-deployed-and-the-error-stayed/ Sat, 15 Aug 2026 00:00:00 GMT I deployed a Firestore index, relaunched, and got the identical failed-precondition error. The deploy was fine. A building index reports exactly like a missing one. firestore index firebase failed-precondition deployment composite index https://www.kiniinsight.com/en/posts/2026-08-15-turning-off-the-auto-popup-deleted-the-feature/ https://www.kiniinsight.com/en/posts/2026-08-15-turning-off-the-auto-popup-deleted-the-feature/ Sat, 15 Aug 2026 00:00:00 GMT I disabled a bottom sheet that opened automatically because it annoyed me. That automatic open was its only entry point. I did the same thing twice in two days. entry point react native refactoring dead code product https://www.kiniinsight.com/en/posts/2026-08-15-voice-input-because-planning-was-tedious/ https://www.kiniinsight.com/en/posts/2026-08-15-voice-input-because-planning-was-tedious/ Sat, 15 Aug 2026 00:00:00 GMT Typing todos into my own app annoyed me, so I built voice input for one spoken sentence. No model, just regex, and a split rule that nearly cut verbs in half. voice input korean parsing on-device stt regex product https://www.kiniinsight.com/en/posts/2026-08-13-view-flattening-killed-the-gl-context/ https://www.kiniinsight.com/en/posts/2026-08-13-view-flattening-killed-the-gl-context/ Thu, 13 Aug 2026 00:00:00 GMT A 3D planet stopped animating on iPhone only. The GL context was alive, three.js rendered every frame, and endFrameEXP fired 60 times a second. Nothing reached the screen. The cause was React Native's view flattening. react-native new architecture fabric expo-gl view flattening three.js ios https://www.kiniinsight.com/en/posts/2026-08-11-claude-md-rules-vanish-on-another-machine/ https://www.kiniinsight.com/en/posts/2026-08-11-claude-md-rules-vanish-on-another-machine/ Tue, 11 Aug 2026 00:00:00 GMT Instruction files fail open. Auditing CLAUDE.md turned up two rules living only on this laptop, plus two referenced files that never existed. CLAUDE.md AI coding tools monorepo developer environment reproducibility automation code review https://www.kiniinsight.com/en/posts/2026-08-11-glb-file-size-textures/ https://www.kiniinsight.com/en/posts/2026-08-11-glb-file-size-textures/ Tue, 11 Aug 2026 00:00:00 GMT Two sky models arrived at 8MB for a phone app. Almost all of that GLB file size was 2048px textures my renderer discards before the first frame. GLB file size gltf three.js react-three-fiber react native 3d asset optimization https://www.kiniinsight.com/en/posts/2026-08-11-habit-streaks-removed/ https://www.kiniinsight.com/en/posts/2026-08-11-habit-streaks-removed/ Tue, 11 Aug 2026 00:00:00 GMT Habit streaks get heavier the longer they run: one missed day costs 3 early on and 100 later. Here is what I shipped instead, with numbers. habit streaks habit tracker product design motivation retention app design https://www.kiniinsight.com/en/posts/2026-08-11-react-native-modal-soft-lock/ https://www.kiniinsight.com/en/posts/2026-08-11-react-native-modal-soft-lock/ Tue, 11 Aug 2026 00:00:00 GMT The onboarding button did nothing and the app looked frozen. A React Native Modal is a separate window, so it swallows touches from everything below. react native modal onboarding react native react navigation mobile app bugs touch handling https://www.kiniinsight.com/en/posts/2026-08-11-scheduled-notifications-account-switch/ https://www.kiniinsight.com/en/posts/2026-08-11-scheduled-notifications-account-switch/ Tue, 11 Aug 2026 00:00:00 GMT After a sign-out, the previous user's tasks kept firing on my lock screen. Scheduled notifications live in a per-device OS queue that auth state never touches. scheduled notifications expo-notifications react native android alarmmanager account switching mobile app bugs https://www.kiniinsight.com/en/posts/2026-08-11-turborepo-cache-hit-restored-nothing/ https://www.kiniinsight.com/en/posts/2026-08-11-turborepo-cache-hit-restored-nothing/ Tue, 11 Aug 2026 00:00:00 GMT Turborepo reported FULL TURBO in 62ms and wrote zero build artifacts. The cause was one line in outputs, sitting behind a root task that had not run for 71 days. turborepo monorepo build cache turbo.json pnpm workspace cache invalidation CI