Practical how-to guides on guitar practice, habits, planning, and the iOS apps behind them — from an independent developer shipping since 2011.https://karasik.co/en-ushttps://karasik.co/apps/twenty-seven/guides/pythagorean-expectationhttps://karasik.co/apps/twenty-seven/guides/pythagorean-expectationPythagorean expectation estimates how many games a team should have won from its runs scored and allowed. How the formula works and what the gap really means.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/run-differentialhttps://karasik.co/apps/twenty-seven/guides/run-differentialRun differential is runs scored minus runs allowed — and it predicts future wins better than a team’s actual record. Here’s why, and how to read it.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/how-playoff-odds-are-calculatedhttps://karasik.co/apps/twenty-seven/guides/how-playoff-odds-are-calculatedPlayoff odds come from simulating the rest of the season thousands of times. How Monte Carlo simulation works, what goes into it, and how to read the number.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/strength-of-schedulehttps://karasik.co/apps/twenty-seven/guides/strength-of-scheduleStrength of schedule measures how tough a team’s opponents have been — and how tough they’re about to be. How it’s calculated and why it matters in September.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/run-expectancyhttps://karasik.co/apps/twenty-seven/guides/run-expectancyRun expectancy is the average runs scored from any base-out state. Learn the 24-state matrix, how RE24 credits players, and why it explains the sacrifice bunt.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/late-and-closehttps://karasik.co/apps/twenty-seven/guides/late-and-closeLate and close is a defined MLB split: the 7th inning or later with the tying run at least on deck. What qualifies, and why the stat is smaller than it looks.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/championship-win-probability-addedhttps://karasik.co/apps/twenty-seven/guides/championship-win-probability-addedcWPA measures how much a single play changed a team’s chance of winning the World Series — the stat that makes October plays worth thousands of times more.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/what-is-war-in-baseballhttps://karasik.co/apps/twenty-seven/guides/what-is-war-in-baseballWAR estimates how many more wins a player is worth than a freely available replacement. What goes into it, how to read the scale, and why versions disagree.Mon, 31 Aug 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/guitar-genius/guides/what-is-the-caged-systemhttps://karasik.co/apps/guitar-genius/guides/what-is-the-caged-systemUnderstand the CAGED system on guitar: what the five moveable chord shapes are, how they connect across the neck, and how Guitar Genius shows five positions.Sun, 12 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/how-to-tune-a-guitarhttps://karasik.co/apps/guitar-genius/guides/how-to-tune-a-guitarLearn how to tune a guitar to standard EADGBE, tune by ear with the 5th-fret method, and set up Drop D and other alternate tunings with Guitar Genius.Sun, 12 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/guitar-chords-for-beginnershttps://karasik.co/apps/guitar-genius/guides/guitar-chords-for-beginnersLearn the easy first guitar chords for beginners, how to make them ring cleanly, and how to switch between them — with the full chord library in Guitar Genius.Sun, 12 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/minor-pentatonic-scalehttps://karasik.co/apps/guitar-genius/guides/minor-pentatonic-scaleThe minor pentatonic scale on guitar explained: the five notes, all five positions, the blues note, and how Guitar Genius lights up every shape on the neck.Sun, 12 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/circle-of-fifthshttps://karasik.co/apps/guitar-genius/guides/circle-of-fifthsThe circle of fifths explained for guitar: read key signatures, find the chords in any key, and transpose songs — with an interactive circle in Guitar Genius.Sun, 12 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/songvault/guides/practice-a-difficult-passagehttps://karasik.co/apps/songvault/guides/practice-a-difficult-passageStuck on the same few bars? Use the method experts rely on: isolate the passage, slow it, loop it, and rebuild it up to speed. SongVault is built for it.Sun, 12 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/songvault/guides/learn-a-song-on-guitarhttps://karasik.co/apps/songvault/guides/learn-a-song-on-guitarLearn any song on guitar with a repeatable method: map the structure, break it into sections, master each slowly, then join them. SongVault makes it stick.Sun, 12 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/songvault/guides/improve-your-timing-and-rhythmhttps://karasik.co/apps/songvault/guides/improve-your-timing-and-rhythmRushing or dragging? Improve your timing and rhythm by playing along with the real recording, slowed down and looped. SongVault turns any song into your guide.Sun, 12 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/todoko/guides/how-to-stop-procrastinatinghttps://karasik.co/apps/todoko/guides/how-to-stop-procrastinatingProcrastination usually means a task that feels too big and too vague. Learn how to stop procrastinating by shrinking the first step — and how TODOKO helps.Sun, 12 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/how-to-plan-your-weekhttps://karasik.co/apps/todoko/guides/how-to-plan-your-weekA calm way to plan your week: review, pick a few outcomes, and spread tasks across days instead of piling them on Monday. TODOKO plans a day at a time.Sun, 12 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/time-blocking-for-beginnershttps://karasik.co/apps/todoko/guides/time-blocking-for-beginnersTime blocking for beginners, explained simply: what it is, why it works, and how to start. TODOKO keeps it day-level and calm — no rigid hourly grid.Sun, 12 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/how-to-build-a-daily-routinehttps://karasik.co/apps/todoko/guides/how-to-build-a-daily-routineHow to build a daily routine that sticks: start small, anchor new habits, and keep a minimum version for bad days. TODOKO repeats what needs to repeat.Sun, 12 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/habitflow/guides/how-to-break-a-bad-habithttps://karasik.co/apps/habitflow/guides/how-to-break-a-bad-habitYou can’t erase a bad habit — you replace it. Learn to swap the routine, remove the trigger, and let HabitFlow’s streaks make the new habit stick.Sun, 12 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/how-habits-work-the-habit-loophttps://karasik.co/apps/habitflow/guides/how-habits-work-the-habit-loopEvery habit runs on a cue, routine, and reward. Learn the loop behind your behavior — and how HabitFlow’s streaks supply the reward that makes it stick.Sun, 12 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/how-to-build-a-morning-routinehttps://karasik.co/apps/habitflow/guides/how-to-build-a-morning-routineA good morning routine is built one small habit at a time, not copied from a guru. Learn how to design yours — and how HabitFlow helps it stick.Sun, 12 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/motivation-vs-disciplinehttps://karasik.co/apps/habitflow/guides/motivation-vs-disciplineMotivation fades; systems don’t. Learn why discipline beats willpower for building habits — and how HabitFlow’s streaks turn showing up into a system.Sun, 12 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/dutiful/guides/how-often-to-change-hvac-air-filterhttps://karasik.co/apps/dutiful/guides/how-often-to-change-hvac-air-filterHow often should you change your HVAC air filter? A rule of thumb by filter thickness, pets, and allergies, plus how Dutiful reminds you when it’s due.Sun, 12 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/how-often-to-replace-running-shoeshttps://karasik.co/apps/dutiful/guides/how-often-to-replace-running-shoesHow often should you replace running shoes? The 300–500 mile rule of thumb, the wear signs to watch, and how Dutiful reminds you when a new pair is due.Sun, 12 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/how-often-to-change-your-oilhttps://karasik.co/apps/dutiful/guides/how-often-to-change-your-oilHow often should you change your oil? Why the 3,000-mile rule is outdated, the synthetic and conventional intervals, and how Dutiful tracks the date for you.Sun, 12 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/how-often-to-wash-your-sheetshttps://karasik.co/apps/dutiful/guides/how-often-to-wash-your-sheetsHow often should you wash your bed sheets? The once-a-week rule of thumb, when to wash more often, and how Dutiful reminds you so it never slips past due.Sun, 12 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/guitar-genius/guides/memorize-the-fretboardhttps://karasik.co/apps/guitar-genius/guides/memorize-the-fretboardMemorize the guitar fretboard in a couple of weeks with a simple 10-minute daily method: natural notes, dot landmarks, octave shapes, and a call-and-find drill.Sat, 11 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/guitar-practice-routinehttps://karasik.co/apps/guitar-genius/guides/guitar-practice-routineA simple daily guitar practice routine for beginners: why 15 minutes a day beats long weekend sessions, a three-block structure to follow, and how to stay consistent.Sat, 11 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/guitar-genius/guides/solo-over-a-backing-trackhttps://karasik.co/apps/guitar-genius/guides/solo-over-a-backing-trackLearn to improvise guitar solos over a backing track: find the key, use the minor pentatonic, lock your timing to the drums, target chord tones, and leave space.Sat, 11 Jul 2026 00:00:00 GMTGuitar Geniushttps://karasik.co/apps/songvault/guides/slow-down-a-song-to-learn-ithttps://karasik.co/apps/songvault/guides/slow-down-a-song-to-learn-itSlow a tricky song down to a tempo you can play cleanly, keep the pitch natural, then bring the speed back up gradually. SongVault slows any track for practice.Sat, 11 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/songvault/guides/loop-a-section-of-a-songhttps://karasik.co/apps/songvault/guides/loop-a-section-of-a-songStuck on one riff? Set an A-B loop around the exact bars you keep missing and repeat them until they stick. SongVault loops any song section for focused practice.Sat, 11 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/songvault/guides/learn-a-song-by-earhttps://karasik.co/apps/songvault/guides/learn-a-song-by-earLearn any song by ear: get it in your head, find the key, then loop and slow down the tricky bars until they click. SongVault is built for learning by ear.Sat, 11 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/songvault/guides/loop-a-youtube-video-to-practicehttps://karasik.co/apps/songvault/guides/loop-a-youtube-video-to-practiceYouTube on iPhone only loops the whole video. Here’s how to loop and slow down just one section of a music video. SongVault imports YouTube for A-B practice.Sat, 11 Jul 2026 00:00:00 GMTSongVaulthttps://karasik.co/apps/todoko/guides/to-do-list-that-workshttps://karasik.co/apps/todoko/guides/to-do-list-that-worksTo-do lists fail when they become an endless backlog. Learn how to make a to-do list that actually works — short, specific, tied to a day — and TODOKO helps.Sat, 11 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/how-to-plan-your-dayhttps://karasik.co/apps/todoko/guides/how-to-plan-your-dayA simple way to plan your day: pick two or three important tasks, plan the night before, and stay realistic. Learn the routine — and how TODOKO keeps it calm.Sat, 11 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/how-to-prioritize-taskshttps://karasik.co/apps/todoko/guides/how-to-prioritize-tasksWhen every task feels urgent, try this: separate urgent from important, pick your top three, and schedule the rest. A calm way to prioritize — with TODOKO.Sat, 11 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/todoko/guides/daily-planner-vs-to-do-listhttps://karasik.co/apps/todoko/guides/daily-planner-vs-to-do-listDaily planner vs to-do list — what’s the difference, and which should you use? A plain-English comparison, plus a hybrid that gives you both, with TODOKO.Sat, 11 Jul 2026 00:00:00 GMTTODOKOhttps://karasik.co/apps/habitflow/guides/how-long-to-form-a-habithttps://karasik.co/apps/habitflow/guides/how-long-to-form-a-habitForget the 21-day myth — research says a habit takes about 66 days to stick. Learn what the science really shows and how HabitFlow keeps you consistent.Sat, 11 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/build-a-habit-that-stickshttps://karasik.co/apps/habitflow/guides/build-a-habit-that-sticksMost new habits fail because they start too big. Learn the proven way to build a habit that sticks — and how HabitFlow makes showing up effortless.Sat, 11 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/what-is-habit-stackinghttps://karasik.co/apps/habitflow/guides/what-is-habit-stackingHabit stacking attaches a new habit to one you already do so it sticks faster. Learn the formula, real examples, and how HabitFlow makes it easy.Sat, 11 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/habitflow/guides/how-to-not-break-a-streakhttps://karasik.co/apps/habitflow/guides/how-to-not-break-a-streakMissing one day will not ruin your progress — missing two might. Learn how to keep a habit streak alive, and how HabitFlow makes every day visible.Sat, 11 Jul 2026 00:00:00 GMTHabitFlowhttps://karasik.co/apps/twenty-seven/guides/how-win-probability-workshttps://karasik.co/apps/twenty-seven/guides/how-win-probability-worksWin probability estimates each team’s chance of winning at any moment. Learn how it’s calculated, how to read the curve, and how TwentySeven tracks it live.Sat, 11 Jul 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/leverage-index-explainedhttps://karasik.co/apps/twenty-seven/guides/leverage-index-explainedLeverage index measures how much the next play could swing a game. Learn the 0-to-10 scale, what makes a moment high-leverage, and how TwentySeven surfaces it.Sat, 11 Jul 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/twenty-seven/guides/win-probability-added-wpahttps://karasik.co/apps/twenty-seven/guides/win-probability-added-wpaWPA credits each player for the win probability they add or lose on every play. Learn the formula, why context matters, and how TwentySeven ranks player impact.Sat, 11 Jul 2026 00:00:00 GMTTwentySevenhttps://karasik.co/apps/dutiful/guides/how-often-to-replace-water-filterhttps://karasik.co/apps/dutiful/guides/how-often-to-replace-water-filterHow often should you replace your water filter? A guide to fridge, pitcher, and whole-house intervals, plus how Dutiful reminds you when it’s due.Sat, 11 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/home-maintenance-checklisthttps://karasik.co/apps/dutiful/guides/home-maintenance-checklistA home maintenance checklist organized by frequency — monthly, seasonal, and annual tasks — plus how Dutiful reminds you when each one is actually due.Sat, 11 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/how-often-to-replace-toothbrushhttps://karasik.co/apps/dutiful/guides/how-often-to-replace-toothbrushHow often should you replace your toothbrush? The dentist rule of thumb, the signs it’s past due, and how Dutiful reminds you before the bristles give out.Sat, 11 Jul 2026 00:00:00 GMTDutifulhttps://karasik.co/apps/dutiful/guides/how-to-remember-recurring-taskshttps://karasik.co/apps/dutiful/guides/how-to-remember-recurring-tasksHow to remember recurring tasks that are too rare for a habit and too irregular for a calendar — the “last time I did it” method, and how Dutiful automates it.Sat, 11 Jul 2026 00:00:00 GMTDutiful