Guides to our Android apps
These guides cover topics we have built our own Android apps for, written so you can solve the problem even without an app.
Every guide starts with the question people actually search for and answers it with steps, a worked example or a table. Only then do we show how our app takes the job off your hands, and we say plainly what it cannot do.
We build the apps ourselves, just like the calculators on ToolboxDay; on Google Play they are listed under the developer name InfinityAkhi. They are free to install; some features are part of a paid Pro version.
Recurring payments: find them, add them up, cancel what you don’t useFind every recurring payment, work out what it costs per year and cancel the ones you no longer need – on Google Play, iPhone, cards and bank accounts.
Lean angle motorcycle guide: how it is measured and what the number meansHow motorcycle lean angle is measured, how much lean speed and corner radius demand, what chicken strips really say, and why apps often read 0° mid-corner.
Constellation finder: how to find constellations in the night skyHow to find constellations with or without a constellation finder: Big Dipper, Polaris, Summer Triangle, Orion, plus compass and dark-adaptation tips.
Oil change reminder: how to time it and never miss itHow often to change your oil, how to turn a mileage interval into a reminder date and which other car maintenance dates to track – with a worked example.
Garden layout planner: how to lay out a raised bed step by stepPlan a raised bed or vegetable garden layout: plants per square foot, companion planting pairs, planting dates from your last frost and a 4-year crop rotation.
Trade journal: what to include and how to review itWhat to include in a trade journal, which stats to review, how to size positions from your risk – with worked examples and a ready-to-use template.
Fishing journal: what to log after every catchWhat to write in a fishing journal, how to measure a fish, what solunar bite times are and why licenses, size limits and seasons depend on your state.
Hive inspection checklist: what to record and when to test for mitesA hive inspection checklist for beekeepers: what to write down, how often to check in swarm season, and the varroa thresholds to compare your counts with.
Mimic voice game: how to play, score and copy sounds betterHow a mimic voice game works: copy a sound with your voice, score it fairly and win. Rules, sound ideas by difficulty and tips for pitch, rhythm and tone.
GTA 6 countdown: how long until release?GTA 6 countdown to November 19, 2026: how many days are left, when pre-loading starts, which platforms are confirmed and which places Rockstar has named.
Swipe to delete photos: clear your gallery without losing anythingHow swipe to delete photos works, where deleted photos go on Android, what happens to your cloud backup, and how to spot duplicates, bursts and screenshots.
Skincare routine tracker: build an order you actually keepHow to use a skincare routine tracker: the right order morning and night, a skin cycling schedule, keeping retinol and acids apart and checking shelf life.
Draw music: how lines become melodies and beatsHow to draw music without reading notes: graphic notation, why the pentatonic scale never sounds wrong, and how tempo, bars and chords fit together.
Baby nap tracker guide: wake windows, naps and sleep by ageWhat a baby nap tracker can show you: how much sleep babies need, typical wake windows and naps by age, early tired signs and safe sleep basics.
What season am I? How to find your color season at homeWhat season am I? How to run a drape test at home, read your undertone, depth and clarity, and match yourself to the 4 or 12 color seasons, with a full chart.
Push-up alarm clock: how to wake up when you sleep through every alarmWhy heavy sleepers sleep through alarms, how to time your alarm with sleep cycles, fix a quiet phone alarm and stop falling back asleep after switching it off.
Reverse singing game: how to talk and sing backwardsHow the reverse singing game works, how to talk backwards, which words are easy or hard, how to reverse audio and party rules for game night.
IBS tracker: how to keep and read a food and symptom diaryHow to use an IBS tracker or food diary: what to log, for how long, how the Bristol stool chart works, how to read patterns carefully and when to see a doctor.
Dew point calculator for your home: humidity, cold walls and airingHow to use a dew point calculator at home: what dew point means, indoor humidity targets, mold risk on cold walls and when opening a window dries the air.
EMF reader on your phone: how to measure magnetic fields and read the numbersWhat a phone EMF reader really measures: magnetic fields in µT, the Earth’s field as a baseline, typical appliance values and why Wi-Fi and 5G are not detected.
Spy word game: how to play and how to catch the imposterHow to play the spy word game (imposter game): rules for 3 to 10 players, good words and categories, tips to bluff or catch the spy, plus a drawing variant.
The Y2K Camera Look: Where It Comes From and How to Shoot ItWhat gives Y2K camera photos their look? CCD sensors, harsh flash, the orange date stamp and white balance explained, with tips for old digicams and phones.
KP index explained: what Kp you need to see the northern lightsWhat the KP index measures, which Kp brings the northern lights to your latitude in the US and UK, and why clouds, darkness and solar wind matter as much.
Glow up challenge: how to plan and document your 30 daysPlan a glow up challenge: pick a length, choose daily habits, take a comparable photo every day and turn them into a timelapse – with a table and checklist.
Spirograph drawing: how to plan points, laps and loopsSpirograph drawing without slipping: how ring and wheel shape the pattern, how many points and laps you get, and how to plan layered mandalas on purpose.
PR tracker for lifting: how to log and beat your recordsWhat counts as a PR, how to estimate your 1RM, how to apply progressive overload and how to log lifts so records stay accurate – with formulas and examples.
Egg laying tracker: count eggs and understand your hensHow many eggs does a chicken lay, why did your hens stop laying, and what does an egg cost you? Laying rate, molt, daylight and incubation, with examples.
Vertical jump measure: how to test your jump height at homeHow to measure your vertical jump at home, turn flight time into inches or cm, compare tests fairly and work out how far you are from dunking – with formula.
369 manifestation: how the 369 method worksHow the 369 manifestation method works: 3, 6 and 9 lines a day for 21 days. Example sentences, a schedule, where it comes from and an honest take.
Cross stitch pattern maker guide: from photo to chart, size and flossHow a photo becomes a cross stitch pattern: work out stitch count and fabric size, choose the number of colours and plan floss and skeins, with examples.
E-invoice viewer: how to open and check an XRechnung or ZUGFeRD fileHow to open and read XRechnung and ZUGFeRD e-invoices, how the formats differ, when Germany’s e-invoicing mandate applies and what to check before you pay.
ECG interpretation step by step: one routine for every tracingA step-by-step ECG interpretation routine: rate, rhythm, axis, intervals and morphology, with normal values, worked examples and common beginner mistakes.
Envelope budget: give every dollar a job before you spend itHow to set up an envelope budget step by step: give every dollar a job, a worked example in dollars, daily spending math, biweekly pay and common mistakes.
Vocal range finder: how to find your range and voice typeFind your vocal range: locate your lowest and highest notes, count octaves and semitones, and compare with bass to soprano – with a chart of notes and Hz.
0 to 60 GPS timer on your phone: how to get times you can trustHow accurate is a 0 to 60 GPS timer on your phone? GPS update rate, 1 ft rollout, slope and common mistakes explained, with worked numbers and a test routine.
Face symmetry test: how to measure your face and read the resultHow a face symmetry test works: midline, landmark pairs, light and head pose, a worked example, and when a sudden change in your face needs a doctor.
Cat logic puzzle: rules and tips for placing every catHow the cat logic puzzle works: one cat per row, column and region, no touching. Five solving techniques, a worked example and tips for 10×10 grids.
Snore recorder: how to record and understand your nightsHow to use a snore recorder on your phone: setup, what causes snoring, a two-week snoring diary, sleep talking, and the warning signs to raise with a doctor.
Neck exercises for a stiff neck: a gentle 3-minute routineGentle neck exercises for a stiff neck and desk days: five moves step by step, a 3-minute routine, how often to do them and when to see a doctor.
Winter arc challenge: set your rules and keep them until December 31What the winter arc challenge is, when it starts, which rules work and how to track your days honestly, with an example daily plan and a checklist.
Visited countries map: how to count the places you have beenHow many countries are there, what counts as a visit and how to work out your share of the world: 193, 195 or more, with worked examples and tips.
Photo grid splitter: how to cut a picture into a perfect gridHow a photo grid splitter works: tile and panorama sizes, the right posting order for a 3x3 grid, why profile grids crop, and how to make seamless carousels.
Desktop pet for phone: a tiny pet that lives on your screenHow a desktop pet for phone walks over your apps: the overlay permission, battery use, privacy, and tips for turning a photo of your own pet into one.
No spend challenge: rules, how to start and a worked exampleHow the no spend challenge works: set your rules, start right, work out your savings, and compare it with no buy, 52 week and 100 envelope challenges.
Supplement tracker: how to take supplements consistentlyHow to take supplements safely, convert vitamin D between mcg and IU, and work out how long a bottle lasts and what it costs a month – with tables and sources.
Golf handicap calculator: index, course handicap and playing handicapHow a golf handicap index is calculated under the WHS: score differential, best 8 of 20, the table for fewer scores, course handicap and net double bogey.
Euro coin collection: how to start, what to collect and which coins are rareStart a euro coin collection: what a full set contains, which 2 euro commemorative coins are rare by mintage, how to judge condition and check values honestly.
Daily protein tracker: how to count protein the easy wayHow much protein per kg or lb of body weight is recommended, how to count protein in everyday food and close the gap – with tables, examples and sources.
Doomscrolling blocker: how to stop the endless scrollWhat doomscrolling is, which Android settings help against it and how a blocker with an exercise toll works – with worked numbers and a one-week checklist.
CDL permit test: what is on it and how to passWhat is on the CDL permit test, how many questions each part has, the 80 % pass mark, which tests Class A, B and C need, and what follows once you hold the CLP.
Cold plunge for beginners: how long, how cold, how safeCold plunge basics for beginners: a simple rule for how long to stay in, how to start, cold water shock warning signs and how to warm up safely afterwards.
Row counter for knitting: how to keep track of every rowHow to count rows and rounds, track decreases every X rows, follow pattern repeats and turn your row gauge into inches or cm – with worked examples.
Cut list optimizer: how to plan plywood cuts with less wasteHow a cut list optimizer works and how to plan it by hand: sheets needed, saw kerf, panel saw cuts, grain direction, edge banding and waste percentage.
Reptile tracker: what to record for your snake or lizardWhat to log in a reptile tracker: feeding, shedding and weight, the warning signs to watch for, and how ball python morph genetics work, with examples.
Hybrid training plan: how to prepare for a fitness raceA hybrid training plan for the 8 × 1 km + 8 station fitness race: weekly structure, splitting a target time, station practice and taper – with a worked example.
4-7-8 Breathing: How the Technique Works and What It Can Do4-7-8 breathing step by step: in for 4, hold for 7, out for 8. How it compares with box breathing, safety rules and what the research really says.
True north compass: how to point at the real north, not just magnetic northTrue north vs magnetic north explained: find your declination, convert bearings, check a phone compass for interference and confirm north with the sun.
Dumpling squishy: what to know before you squish, buy or collectWhat a dumpling squishy is, whether squishies can be toxic, mystery box odds worked out, and how to make a paper dumpling squishy at home in half an hour.
How to plan a wedding seating chartHow to make a wedding seating chart step by step: head table options, how many tables you need, plus-ones, kids, dietary needs and the mistakes to avoid.
Pet vaccine tracker: keep your dog’s and cat’s shots on scheduleHow to keep a pet vaccine tracker: core dog and cat vaccines, puppy shots, boosters, how often to deworm and what pets need for EU travel, with a checklist.
Questions for couples: turn “how was your day?” into a real talkQuestions for couples by occasion: getting to know each other, deep, fun and for long-term partners, plus simple conversation rules and the 36 questions idea.
Car engine sounds explained: firing order, rpm and exhaustCar engine sounds explained: work out the firing frequency, see how firing order and crankshaft shape the note, which noises mean trouble and what EVs do.
Running a horse share: riding days, costs and a clear agreementHow to run a horse share fairly: fixed riding days, working out the sharer’s contribution, insurance questions, a written agreement and smooth handovers.
Tracing projector on your phone: how to trace any picture by handUse your phone as a tracing projector: set it over the paper, trace without tracing paper and scale a picture up to a canvas or wall with a grid, with examples.
The VHS Camcorder Look: What Creates It and How to Film ItWhat makes footage look like it came from a VHS camcorder? Resolution, colour bleed, tracking lines, 4:3 and the date overlay explained, with practical tips.
Metal detecting: permission, the law and keeping a find logMetal detecting rules explained: landowner permission, US federal land and the UK Treasure Act, reporting finds, and how to search a field systematically.
Live moon wallpaper: moon phases, moonrise and battery explainedHow to read the moon phase, full moon dates for 2026/27, why moonrise is later each day, why the moon looks orange, and what a live wallpaper costs in battery.
GLP-1 injection tracker: doses, sites and side effects in one logHow to use a GLP-1 injection tracker: what to log for each shot, how to rotate injection sites, what half-life means and how to prepare for your doctor visit.
Expiration date tracker: keep the fridge and pantry in dateBest before vs use by, how to read date codes on packs and how to set up a fridge and pantry system so less food ends up in the bin – with a checklist.
Hunting journal: what to log and how it makes you a better hunterWhat to write in a hunting journal, a simple log template, how to record wind and sightings, and how to read a season of sits to pick the right stand.
Fan sounds for sleeping: why they work and how to use themWhy fan sounds for sleeping work for so many people, how fan noise compares with white, pink and brown noise, and how loud a sleep sound should be.
How to build a capsule wardrobe from the clothes you already ownHow many pieces a capsule wardrobe needs, how to count outfits, work out cost per wear and declutter with a plan, with worked examples and a checklist.
Chat analyzer guide: what the numbers in your chat really showHow to export a chat, count messages, read reply times and conversation starters, what the numbers can and cannot tell you, and how to stay fair.
Boiled egg timer: how long to boil an egg for every yolkHow long to boil an egg: a boiled egg timer chart by size, from the fridge or room temperature, at altitude, and soft and hard eggs ready together in one pot.
Aim trainer and reaction time: what to practise and how to measure itHow an aim trainer and a reaction time test work, what a normal reaction time is, why phones add milliseconds and how to practise speed and accuracy fairly.
Zodiac compatibility: how a birth chart comparison really worksHow zodiac compatibility is worked out from two birth charts: Sun, Moon and Rising, why birth time matters, what aspects mean and what astrology cannot do.