Every tooth.
Every PSI.
Every lap.

Enter front and rear sprocket teeth, tyre diameter and peak RPM to get the gear ratio, rollout per wheel revolution, distance per engine rev and theoretical speed. Cards show what one rear tooth either way does to the numbers, and in-stock sprockets from Spares Inventory appear as tap chips. Works offline.

• Gear ratio from front and rear sprocket teeth, shown as x.xx : 1
• Rollout per wheel revolution and distance per engine revolution in metres
• Theoretical speed in km/h at your chosen peak RPM
• "One tooth either way" cards comparing rear +1 and −1 tooth against the current setup

Enter front and rear sprocket teeth and the sprocket centre distance, choose a chain pitch (#219 kart standard, #35 or #428) and get the exact link count, the chain to buy rounded up to the next even number, and its length in metres. Works offline.

• Standard chain-length formula from teeth, centre distance and pitch
• Pitch presets: #219 (7.774 mm), #35 (9.525 mm) and #428 (12.70 mm)
• Exact link count shown to one decimal place
• "Chain to buy / make" rounded up to the next even link count

Log the cold pressures you set and the hot pressures straight off track for all four corners, with date, track, tyre set, ambient temperature and a note. The app works out the cold-to-hot rise per corner and shows it on every saved session. Stored on the phone and works offline.

• Cold (set) and hot (off track) pressures in psi for FL, FR, RL and RR
• Automatic cold-to-hot rise per corner on every saved session
• Date, track / session, tyre set, ambient temperature and notes per log
• Tap chips for your active (not retired) sets from Tyre Sets

Pick an engine preset or type any ratio, then either enter petrol litres to get the oil to add in ml, or enter a target premix total to split it into petrol litres and oil ml. Presets cover IAME X30, Rotax Max, KZ, Vortex ROK and generic 2-stroke. Works offline.

• "Petrol → oil" mode: oil to add in ml for the petrol you have
• "Fill a can" mode: splits a target premix total into petrol litres and oil ml
• Engine presets: IAME X30 20:1, Rotax Max 50:1, KZ shifter 20:1, Vortex ROK 25:1, generic 2-stroke 25:1
• 4-stroke / electric preset that confirms no premix is needed

Enter driver weight in kit, kart weight and the class minimum (or tap a preset) to see how much lead to bolt on or how far over you are. Log each weigh-in and the history shows the change since the last one, which matters for growing juniors. Works offline.

• Lead to add, or over the minimum by, from driver + kart vs class minimum
• Status pill: bolt it on, on weight (within 2 kg) or comfortably over
• Class minimum presets: Bambino, Cadet, Junior X30, Junior Rotax, Senior X30, Senior Rotax, KZ2
• Dated weigh-in log for driver weight in kit

Load a real track outline from the AVB track library, or start from a blank sheet, and draw racing lines with five colour-coded pens: braking, apex, throttle, defending and wet line. Sketches save with the outline included, so they reopen offline. Fetching a track outline needs sign-in and a connection.

• Real track outlines from the AVB track library, drawn north-up
• Blank sheet for tracks not in the library
• Five pens: Braking, Apex, Throttle, Defending, Wet line
• Dashed line toggle and stroke width slider

A pre-scrutineering self-check you run in the awning before the kart goes to the bay. Twenty-one checks across Safety-critical and Bodywork & compliance, fourteen of them critical. The GO / NO-GO pill only turns GO when every critical item is ticked, and each run is saved per race meeting as a dated record.

• 21 checks in two sections: Safety-critical (12) and Bodywork & compliance (9)
• 14 critical items drive a live GO / NO-GO pill and progress bar
• Transponder mount is checked but never fails a run (timing, not safety)
• Save each run against a race meeting, with date, ticked count and GO status in the Saved runs history

A tracker for the dates that scrutineering and sign-on check: helmet, race suit, gloves, boots, race licence, medical and transponder subscription. Each item shows green, amber inside 60 days or red once expired, sorted soonest first so the next problem is always at the top. Expiry dates also appear in the app's calendar.

• Eight kinds: Helmet, Race suit, Gloves, Boots, Race licence, Medical, Transponder sub, Other
• Red / amber / green status: amber inside 60 days, red once expired
• List sorted soonest-expiring first
• Edit the date on renewal without losing the item

A packing checklist for race day, split into Kart & spares, Driver kit and Paddock & admin. Nine items that end a weekend when forgotten, such as the licence, transponder, helmet and fuel, drive a GO / NO-GO pill. Name the run after the meeting, save it, and keep a history of every event you packed for.

• 34 items in three sections: Kart & spares (14), Driver kit (10), Paddock & admin (10)
• 9 critical items drive a live GO / NO-GO pill and progress bar
• Transponder line shows your own transponder number when the phone already has it stored
• Save each run per event, with date, ticked count and GO status in Saved runs

A curated kart setup guide in your pocket: 23 hand-written cards across Setup effects, How-to jobs, Torque & specs, Troubleshooting and Wet weather. Each card gives the aim, numbered steps and, where useful, common faults and a caveat. Search across every card or filter by category, with no signal needed.

• 23 curated cards in five categories: Setup effects (9), How-to jobs (5), Torque & specs (2), Troubleshooting (6), Wet weather (1)
• Each card shows the aim, numbered How to steps, and Common faults & fixes where relevant
• Time budgets on jobs, from about 5 minutes (chain alignment) to about 45 (seat fitting)
• Search across card titles, aims, steps and faults, plus category filter chips

Hand-written karting technique cards for drivers and the people coaching them. Nine cards across Starts, Overtaking, Defending, Wet driving and Practice drills, each with the aim, how to drive it and, on most cards, the common faults with the fix. Drills carry minute budgets sized for a real practice day. Search or filter, offline.

• 9 curated cards in five categories: Starts (2), Overtaking (2), Defending (1), Wet driving (1), Practice drills (3)
• Each card shows the aim and How to drive it steps; most add Common faults & fixes
• Practice drills carry time budgets: brake-point walking (~15 min), consistency ladder (~20 min), follow-the-leader (~15 min)
• Drills point to other Pit Kit tools: Track Notes for brake markers, Stopwatch for lap consistency

Race Weekends is the season planner: one card per race meeting with track, date, entry deadline and a list of things to order before you go. Deadline and order pills turn amber then red, and the phone reminds you before each date. Timetable, finishing position and notes sit on the same card.

• One card per race meeting: title, track, race date and optional entry deadline
• "To order before this event" list with a needed-by date per item and tick-off checkboxes
• Entry deadline pill turns amber inside 14 days and red once passed; order count turns amber inside 7 days of the most urgent needed-by date and red once it passes
• On-device reminders at 09:00: 7 days and 1 day before the entry deadline, 3 days before and on the day for each unticked, dated order item (up to 16 per event)

Engine Hours logs run time for each kart engine and counts down to its next top-end and bottom-end rebuild. Quick-add chips make logging after a session a two-second job, status pills go amber when a rebuild is close, and logging a rebuild resets the counter and records its cost.

• Per-engine name, type, notes and editable top-end and bottom-end rebuild intervals (defaults 10 h and 50 h)
• Quick-add run time chips (+5, +10, +15, +30 min) plus custom minutes, with negative values to correct mistakes
• Status pills for each end: healthy, due soon (20% or less of the interval left) and overdue
• Rebuild log with type, date, cost, who rebuilt it and notes; top end resets the top counter, bottom end resets both

Service Log is a dated maintenance diary for your karts. Log each job against a kart with the item, date, cost and a note, and the Last done strip shows when every item was last serviced, with items you have never logged flagged in amber, so you can see at a glance what has been left too long.

• 11 service items: chain, sprockets, clutch, brake pads, brake fluid, carburettor, wheel bearings, kingpins, seat and mounts, engine, other
• Each job records item, kart, date, optional cost and optional note
• Last done strip: most recent date for each item (all except Other) across all karts, with "never" flagged in amber
• Dated History list with a running count of jobs logged

Spares Inventory lists every spare part you own with its spec, quantity, storage location and the kart it fits. Search and kind filters find a part in seconds, the one fewer and one more buttons keep counts honest, and the Gear Ratio calculator reads your in-stock sprocket sizes straight from it.

• Nine part kinds: sprocket, chain, axle, tyre set, rim, seat, engine part, tool, other
• Each line holds name, spec, quantity, storage location, kart it fits and notes
• Search across name, spec, location and kart, plus filter chips by kind
• One fewer / one more buttons on every line, never below zero; zero stock shows in red

Tyre Sets gives each set of kart tyres its own card: heat cycles, condition from new to retired, barcode, track registration with a meeting allowance, and the race day it is saved for. Scan a tyre's barcode to find its set, and active sets appear as quick picks in the Tyre Pressures log.

• Per-set name, brand/compound, type (slick, wet, intermediate), heat cycles, condition and notes
• +1 cycle button; cycle pill turns amber at 10 cycles
• Condition ladder New (stickers), Scrubbed, Good, Worn, Retired, with retired sets sorted to the bottom
• Track registration with meetings allowed and used, +1 meeting button, amber when one meeting is left and red when the allowance is used

Stopwatch & Laps turns the phone into a pit-wall lap timer: tap anywhere to start and to record each lap, add sector splits, and watch best, average, consistency and theoretical best update live. Save the session with track, driver and conditions, and your best lap shows up in Track Notes for that track.

• Whole-panel tap zone: tap anywhere to start, tap anywhere for each lap, with haptic feedback
• Live best, average and consistency (standard deviation in seconds) plus running gap to best lap
• Target lap entry (e.g. 47.25 or 1:02.4) with green/red gap on every lap
• Sector splits (S1, S2…) and a theoretical best lap from the quickest sector times

Track Notes keeps one page per circuit with the gearing that worked, your personal best, braking markers and kerbs, what worked and what to try next time. If you have timed laps at the same track in Stopwatch & Laps, your best saved lap shows on the note.

• One note per track with Gearing that worked, Personal best, Braking markers & kerbs, What worked and Try next time
• Your best saved lap from Stopwatch & Laps at the same track shows as a Stopwatch best pill on the note
• Pick from track library uses the AVB track catalogue (sign-in and a connection needed), or you can type any track name
• Tracks are listed alphabetically, with gearing and PB shown on each card

Incident Log records every crash, failure or bit of damage with its date, event, cause and repair cost. A Season damage total sits at the top, and each cost appears in Season Budget under Damage automatically.

• Log date, what broke, event or session, cause, repair cost (£) and notes
• Season damage total card adds up every repair cost logged
• Repair costs appear automatically in Season Budget under Damage
• Tap any incident to edit it; delete with confirmation

Points Tracker builds live championship standings from finishing positions. Pick a points preset or type in your club's own list, set the number of dropped rounds, then add each round's results. The table works out every driver's total for you.

• Presets: Club (2 pt gaps), Linear 20 → 1 and F1 style, or type your own points list
• Dropped rounds setting removes each driver's worst round scores
• Standings (P1, P2 …) recalculate whenever you add or delete a round
• Drivers from earlier rounds are pre-filled on each new round

Season Budget logs every karting spend by category and shows a season total with a breakdown, largest category first. Engine rebuild costs from Engine Hours and repair costs from Incident Log appear automatically as linked lines.

• Eight categories: Entry fees, Tyres, Fuel & oil, Engine rebuilds, Parts, Damage, Travel, Other
• Season total plus a per-category breakdown, sorted by size
• Engine rebuild costs from Engine Hours added automatically
• Repair costs from Incident Log added automatically under Damage

Driver Goals turns targets like a lap time, a podium or a licence upgrade into a series of milestones. Each goal has a driver, a target date, a reason and a checklist with notes on what proved each step. Ticking the last milestone marks the goal achieved.

• Goal title, driver, Why this matters and an optional target date
• Status: Active, Achieved or Paused, with filter chips for each
• Milestone checklist with a completion date and an evidence note per step
• Status switches to Achieved automatically when every milestone is ticked

Toolbox Builder is a packing checklist for your kart's toolbox. Pick one of seven kart types and you get a 16-item universal kit plus the tools that engine needs, and you can add your own items. Critical items control a GO / NO-GO pill, and every saved run is dated.

• Seven kart types: IAME X30, Rotax Max, Cadet GX200, KZ shifter, Vortex ROK, Rental / 4-stroke, Electric
• 16-item universal kit plus extras specific to each kart type
• Add your own items in Your extras, saved per kart type
• Critical items control a GO / NO-GO pill, with a ticked counter and progress bar