TachTime 91

Built for Part 91 owners, by an owner

Know your true hourly cost. Never miss what's due.

TachTime 91 replaces the spreadsheets. Run the rent-vs-buy math before you buy, then track every inspection, oil change and AD by tach hours and calendar, whichever comes first.

Run the break-even freeSee the Tracker

First month free. No card needed.

N82451 · Cessna 172STracker
Tachhr

1420.5

Hobbshr

1512.3

Nothing overdue ·2 due soon

Oil change 50 hr

12.4 hr left

Recurring AD recurring

8.0 hr left

Annual inspection 12 cal mo

43 days

Transponder check 91.413

14 months

Whichever comes first
TracksAnnual inspectionOil changesELT (91.207)Transponder (91.413)Recurring ADsSquawksand more

Two tools, one tach

Run the numbers before you buy.
Stay on top of what's due after.

Break-even

Should I buy, or keep renting?

Add the loan, hangar, insurance, fuel and overhaul reserves, then split it with partners. See the hourly cost that actually matters.

Break-even42 hr/mo
— Own $/hr--- Rent $/hr
Try the calculator

Tracker

What's coming due on my airplane?

Log the tach after each flight. Every inspection, oil change and AD counts down by hours or calendar, whichever comes first.

Next due: Oil change12.4 hr
Recurring AD8.0 hr
Annual inspection43 days
Open the tracker

The problem

Why spreadsheets fail in the hangar.

01

Hours and dates drift apart

An oil change is due at 50 hours or 4 months. A spreadsheet tracks one and forgets the other.

02

Partners keep different copies

Three co-owners, three versions of the tach time, and nobody is sure which one is right.

03

Reserves get forgotten until the overhaul

The engine reserve never makes it into the hourly cost, so the overhaul bill arrives as a surprise.

Why I built this

T
“I got tired of running my Mooney out of five broken spreadsheets. TachTime 91 is the tool I wanted on my phone at the hangar.”
Troy, Mooney M20 owner

Pricing

First month free. Then $8 a month per aircraft.

The break-even calculator is always free.

Break-even calculator

Free

$0free forever

  • Unlimited break-even runs
  • Rent vs. own and partnership share math
  • AI market estimates with a free account
Run the break-even

TachTime 91 Tracker

Per aircraft

$8/ month

First month free

Everything for one aircraft — whether one owner or a partnership.

  • Tach + calendar countdowns ("whichever comes first")
  • Required inspections, oil, ELT, VOR and ADs
  • Squawks
  • Partner cost and equity splits
  • Download backup
  • Email and push remindersComing soon
  • AD alertsComing soon
  • Logbook PDF export and document storageComing soon
  • More than one aircraft
  • Partner sync and shared accessComing soon

30 days free. No card needed to start. If no card is added by day 30, the plan simply ends — nothing is charged.

FAQ

Straight answers.

No. It is a planning and record-keeping aid. You, as owner or operator, make that call with your logbooks and your A&P/IA.

Put the spreadsheets away. Keep the tach.

Run the break-even freeSee the Tracker

First month free. No card needed.