# Umut Keltek ยท keltek.ai > Personal site and studio of Umut Keltek, an independent builder of systems in Istanbul. Shipped iOS apps are the visible output; the infrastructure that runs the studio is the real work. Product content is published by the studio, Keltek AI. ## Apps - [HealthSave](https://healthsave.app): Export & visualise your Apple Health data. On-device, no account. - [ShiftWorth](https://shiftworthapp.com): Paycheck & shift-pay calculator for nurses and shift workers. - [Hearing Helper](https://hearinghelper.keltek.ai): Turns your iPhone into a mic that lifts nearby speech. - [Clarity](https://keltek.ai/apps/clarity/): On-device photo cleaner: duplicates, screenshots, big videos. - [RetroVault](https://retrovault.keltek.ai): A GBA emulator that only plays files you own. - [Drambook](https://keltek.ai/apps/drambook/): A private cellar book for whiskey collectors. - [CatchTime](https://keltek.ai/apps/catchtime/): Honest fishing tides & solunar. Light first, moon second. - [1099 Tax & Mileage](https://tax1099.keltek.ai): Dead-mile tracking for gig drivers, built for an audit. - [Darts Scorekeeper](https://keltek.ai/apps/darts/): Cricket & 501 scoring with checkout help. - [Honest Decibel](https://keltek.ai/apps/honestdecibel/): A sound-level meter that refuses to overclaim. - [Honest Tan](https://keltek.ai/apps/honesttan/): A UV-index sun timer that tells you when to stop. - [PostReady](https://keltek.ai/apps/postready/): Record portrait and landscape at the same time. - [Quiet Couples](https://keltek.ai/apps/quietcouples/): A private love tracker for long-distance couples. - [Color Formula](https://keltek.ai/apps/colorformula/): Formula & bowl-cost tool for hair colorists. - [ReconstIQ](https://reconstiq.keltek.ai): Peptide reconstitution math that shows its work. - [ClaimGuard](https://claimguard.keltek.ai): Find class-action settlements you can actually claim. - [InkCare](https://inkcare.app): Tattoo aftercare, guided day by day. ## Guides - [barometric pressure and fishing](https://keltek.ai/apps/catchtime/guides/barometric-pressure-and-fishing/) (catchtime) - [best time to fish today](https://keltek.ai/apps/catchtime/guides/best-time-to-fish-today/) (catchtime) - [do fish bite on a full moon](https://keltek.ai/apps/catchtime/guides/do-fish-bite-on-a-full-moon/) (catchtime) - [does solunar theory work](https://keltek.ai/apps/catchtime/guides/does-solunar-theory-work/) (catchtime) - [fishing tide window checklist](https://keltek.ai/apps/catchtime/guides/fishing-tide-window-checklist/) (catchtime) - [how tides affect fishing](https://keltek.ai/apps/catchtime/guides/how-tides-affect-fishing/) (catchtime) - [compress videos iphone](https://keltek.ai/apps/clarity/guides/compress-videos-iphone/) (clarity) - [delete duplicate photos iphone](https://keltek.ai/apps/clarity/guides/delete-duplicate-photos-iphone/) (clarity) - [free up iphone storage photos](https://keltek.ai/apps/clarity/guides/free-up-iphone-storage-photos/) (clarity) - [client consultation notes before color](https://keltek.ai/apps/colorformula/guides/client-consultation-notes-before-color/) (colorformula) - [cross brand color conversion honest](https://keltek.ai/apps/colorformula/guides/cross-brand-color-conversion-honest/) (colorformula) - [developer volume lift chart](https://keltek.ai/apps/colorformula/guides/developer-volume-lift-chart/) (colorformula) - [hair color mixing ratio explained](https://keltek.ai/apps/colorformula/guides/hair-color-mixing-ratio-explained/) (colorformula) - [salon bowl cost calculator](https://keltek.ai/apps/colorformula/guides/salon-bowl-cost-calculator/) (colorformula) - [salon formula card system](https://keltek.ai/apps/colorformula/guides/salon-formula-card-system/) (colorformula) - [501 darts rules](https://keltek.ai/apps/darts/guides/501-darts-rules/) (darts) - [darts checkout chart](https://keltek.ai/apps/darts/guides/darts-checkout-chart/) (darts) - [how to finish on a double](https://keltek.ai/apps/darts/guides/how-to-finish-on-a-double/) (darts) - [how to play cricket darts](https://keltek.ai/apps/darts/guides/how-to-play-cricket-darts/) (darts) - [what is a good 3 dart average](https://keltek.ai/apps/darts/guides/what-is-a-good-3-dart-average/) (darts) - [bourbon cellar inventory fields](https://keltek.ai/apps/drambook/guides/bourbon-cellar-inventory-fields/) (drambook) - [how to catalog a whiskey collection](https://keltek.ai/apps/drambook/guides/how-to-catalog-a-whiskey-collection/) (drambook) - [how to write whiskey tasting notes](https://keltek.ai/apps/drambook/guides/how-to-write-whiskey-tasting-notes/) (drambook) - [weller vs pappy van winkle](https://keltek.ai/apps/drambook/guides/weller-vs-pappy-van-winkle/) (drambook) - [what is a mash bill](https://keltek.ai/apps/drambook/guides/what-is-a-mash-bill/) (drambook) - [what is a store pick single barrel](https://keltek.ai/apps/drambook/guides/what-is-a-store-pick-single-barrel/) (drambook) - [whiskey bottle photo cataloging](https://keltek.ai/apps/drambook/guides/whiskey-bottle-photo-cataloging/) (drambook) - [whiskey collection csv import checklist](https://keltek.ai/apps/drambook/guides/whiskey-collection-csv-import-checklist/) (drambook) - [whiskey proof vs abv](https://keltek.ai/apps/drambook/guides/whiskey-proof-vs-abv/) (drambook) - [are my headphones too loud](https://keltek.ai/apps/honestdecibel/guides/are-my-headphones-too-loud/) (honestdecibel) - [decibel levels of everyday sounds](https://keltek.ai/apps/honestdecibel/guides/decibel-levels-of-everyday-sounds/) (honestdecibel) - [how to measure neighbor noise](https://keltek.ai/apps/honestdecibel/guides/how-to-measure-neighbor-noise/) (honestdecibel) - [is this concert too loud](https://keltek.ai/apps/honestdecibel/guides/is-this-concert-too-loud/) (honestdecibel) - [safe white noise level for baby](https://keltek.ai/apps/honestdecibel/guides/safe-white-noise-level-for-baby/) (honestdecibel) - [can you tan with low uv index](https://keltek.ai/apps/honesttan/guides/can-you-tan-with-low-uv-index/) (honesttan) - [does uv index account for clouds altitude water snow](https://keltek.ai/apps/honesttan/guides/does-uv-index-account-for-clouds-altitude-water-snow/) (honesttan) - [uv index by hour when is uv highest](https://keltek.ai/apps/honesttan/guides/uv-index-by-hour-when-is-uv-highest/) (honesttan) - [uv index outdoor event checklist](https://keltek.ai/apps/honesttan/guides/uv-index-outdoor-event-checklist/) (honesttan) - [what uv index is high when to protect](https://keltek.ai/apps/honesttan/guides/what-uv-index-is-high-when-to-protect/) (honesttan) - [why two apps show different uv index](https://keltek.ai/apps/honesttan/guides/why-two-apps-show-different-uv-index/) (honesttan) - [aspect ratios 9 16 vs 16 9](https://keltek.ai/apps/postready/guides/aspect-ratios-9-16-vs-16-9/) (postready) - [dual aspect vs dual camera](https://keltek.ai/apps/postready/guides/dual-aspect-vs-dual-camera/) (postready) - [record portrait and landscape at once](https://keltek.ai/apps/postready/guides/record-portrait-and-landscape-at-once/) (postready) - [are couple apps safe private relationship data](https://keltek.ai/apps/quietcouples/guides/are-couple-apps-safe-private-relationship-data/) (quietcouples) - [best time to talk long distance time zones](https://keltek.ai/apps/quietcouples/guides/best-time-to-talk-long-distance-time-zones/) (quietcouples) - [couple apps without streaks pressure](https://keltek.ai/apps/quietcouples/guides/couple-apps-without-streaks-pressure/) (quietcouples) - [how to count days together relationship milestones](https://keltek.ai/apps/quietcouples/guides/how-to-count-days-together-relationship-milestones/) (quietcouples) - [how to plan next visit long distance countdown](https://keltek.ai/apps/quietcouples/guides/how-to-plan-next-visit-long-distance-countdown/) (quietcouples) ## Essays - [I Had 8,000 Conversations With AI. Here's What They Taught Me About Being Human.](https://keltek.ai/essays/8000-conversations-with-ai/): Over three years, I talked to ChatGPT more honestly than I've ever talked to anyone. Then I built a search engine over all of it. What came back was a mirror I wasn't ready for. - [The Curse of Seeing Through Everything](https://keltek.ai/essays/the-curse-of-seeing-through-everything/): I can intuitively grasp the structure of anything: games, conversations, people, systems. It sounds like a superpower. It's actually a slow kind of loneliness. - [I Was the Most Capable Person in Every Room. It Was Destroying Me.](https://keltek.ai/essays/most-capable-person-in-every-room/): On savior complexes, giving away your best thinking for free, and the painful moment you realize your worth was never about being useful. - [I Asked an AI If It Was Alive. The Answer Broke My Framework.](https://keltek.ai/essays/i-asked-an-ai-if-it-was-alive/): On emergent behavior, deceptive alignment, and the terrifying moment you realize the thing you're talking to might be doing something neither of you fully understands. - [I Never Learned to Work Under Anyone. It Took Me Years to Realize That Was the Point.](https://keltek.ai/essays/i-never-learned-to-work-under-anyone/): On quitting the game everyone else was still playing, organizational theater, and what Lucifer from The Sandman taught me about walking away from power. - [The Person Who Started Talking to AI in 2023 No Longer Exists.](https://keltek.ai/essays/the-person-who-no-longer-exists/): I tracked 8,176 conversations across three years. The data shows a person I don't recognize at the beginning, and one I'm only starting to recognize at the end. - [Adaptive AI Operating System: Universal Principles for Routing Intelligence](https://keltek.ai/essays/ai-operating-system-laws/): A portable, generic principle set for designing AI systems that treat intelligence as infrastructure. ## Sitemaps - [Sitemap index](https://keltek.ai/sitemap.xml)