A checklist for every phase of flight

Checklists, in the order you actually fly them.

Chain your checklists into a flow for the flight you're flying, with emergency procedures one tap away. Works fully offline, at night, or with the sun straight on the screen.

Still in development; no spam, just one email when it's ready.

Only used to tell you when PHASE launches. Privacy policy

Engine Start 0/5

✓ Checklist complete

Flight flows

A playlist of checklists, in flying order.

Pattern work repeats Before Takeoff and Landing as many times as you need. A cross-country runs start to shutdown. Step through this one: Previous and Next work exactly as they do in the cockpit.

—

Built once, run every flight

Flows live in the Library so nothing can be edited mid-flight. On the Flight tab they're just a card you tap to start running.

Each segment is labelled and fills green only when that checklist is genuinely complete
Step backwards without losing anything you've already checked
Repeat the same checklist as many times as the flight needs
Previous, Reset and Next sit on one bottom row, reachable one-handed

The flight, not just the aircraft

Set up a flight and PHASE keeps route, fuel, planned time and today's frequencies in view, with New Flight and Reference as two cockpit-style push-buttons right beside it.

One flight, one leg: departure and arrival, with each field's runways, circuits and frequencies pulled in automatically
Starting a new flight resets every checklist in one action
Or reset the checklists alone when the plan hasn't changed

PH-DEMO Aquila A210 · Example Flying Club

Aug 29 · 14:30 · EHLE → EHAM · 95 L

Try them: one flashes, one stays lit

Today's Frequencies 4 selected

Cross-Country Flow 15 checklists

Quick reference

The numbers you keep on a kneeboard.

Build a card for anything you want at a glance, and keep adding as you find gaps. V-speeds stay with one aircraft; frequencies and minima apply to every aircraft you own. Pick a card to see it.

Tap a card to open it.

Know the field

Runways, circuits and frequencies: memorized once.

Build an airfield once and it's matched automatically by ICAO code from then on; set EHLE as today's departure and its runways, circuit info and frequencies are just there, for this flight and every one after it.

DEPARTURE

EHLELelystad Airport

05/23850x18m

TOWER123.680

One end fills in the other

Enter 18 for one end of a runway and the other becomes 36 automatically, no arithmetic, no chance of typing a pair that can't actually exist.

Circuit direction per end: some fields fly left traffic one way and right the other
A runway end can also take traffic from both directions
Or fill an airfield in from online aeronautical data in one tap: the only thing in PHASE that needs a connection, and only while you import. Circuits still get checked against the AIP
Frequencies you add here show up on the Frequencies card automatically, and get offered for Today's Frequencies the moment this field is your departure or arrival
Notes for local quirks — a closed grass strip after dark, a PPR requirement, a taxi gotcha — sit right on that airfield's brief, free text or a bulleted list
Set up to two alternates on a flight plan and they show alongside departure and arrival, one tap away from that field's own brief

Write it. Don't type it.

ATIS gets copied down at the speed it's read out; a pencil keeps up with that better than a keyboard. One long page per aircraft, scrolling like a real kneeboard page.

Its own tab: one tap from anywhere in the app, never buried behind a tile
Optional ATIS and CRAFT clearance guides behind the ink; hide them any time without losing a word you wrote
Nothing is versioned or archived; it holds what you wrote until you clear it, on purpose
Finger or Apple Pencil: whichever you've got in hand

On the ground

Build it once, in the Library.

Creating, editing and reordering all live in one place, so nothing on the Flight tab can be changed by accident while you're busy flying the aeroplane.

Per-aircraft libraries

A stock 172's Before Takeoff isn't a turbocharged Bonanza's. Checklists, flows and cards each belong to one tail number.

Branching responses

Some items aren't one value. Hot engine → OFF, cold engine → PUSH, on one line instead of two near-identical checklists.

Live item preview

The editor renders each item with the exact component the run screen uses, so what you build is what you'll read at 2,000 feet.

Notes, cautions, warnings

Not every line is a challenge. Banner rows carry the caution that belongs beside a step without pretending to be one.

Reorder anything

Drag items inside a checklist, move checklists within their phase, and shuffle cards until the order matches how you actually work.

Undo on reset

Cleared a checklist by mistake mid-flight? Reset offers an undo for a few seconds and puts every tick back exactly as it was.

Aircraft and airfields, one tap away

Manage Aircraft and Airfields sit in the Library toolbar itself, the same place you already build checklists, flows and cards, not buried in a settings menu.

Built for VoiceOver and big text

Every row reads in cockpit order: "Critical. Oil pressure, check within 30 seconds. Checked." Text follows your Dynamic Type size, and nothing keeps moving with Reduce Motion on.

When it goes wrong

Always black. Always red. Always one tap.

The emergency screen ignores whichever theme you've chosen. It looks identical whether you were in day, night or glare mode a second ago, because an engine failure is not the moment to be re-learning an interface.

And it's never a menu away: a red emergency button sits on the Flight screen at all times, so there's nothing to hunt for.

Engine Failure: In Flight9 items

Engine Fire: In Flight6 items

Failure After TakeoffBelow 1000 AGL · 4

Alternator FailureAbnormal · 4

Light you can actually read

Four cockpits, one app.

Pick one: the whole page changes with it, exactly as the app does. Night keeps everything in the red family so it won't cost you your dark adaptation.

Why this exists

It started as a kneeboard I kept getting wrong.

"Every flight began the same way: copying frequencies onto my kneeboard by hand, hoping I'd read the right line off the right chart."

I designed my own kneeboard template: boxes for frequencies, fuel, weather. It worked, but it meant ten minutes of transcription before every flight, and transcription is exactly the kind of task that goes quietly wrong: a digit swapped, a tower frequency from the wrong field.

Then there's everything that isn't on the kneeboard: VMC minima, light gun signals. I know them, but hunting across an app, a PDF and a laminated card while flying single-pilot is genuinely hard.

I still write the frequencies down; paper doesn't run out of battery. But now I'm copying from something built carefully on the ground.

JogendraPPL · builds PHASE between flights

Private Pilot Licence PPL(A)

NameJogendra

FliesSingle-engine piston

StatusBuilding hours

Jogendra Designed & built
between flights

The pilot who got tired of rewriting frequencies.

Pricing

Free for your aircraft. Pro for a fleet.

Everything PHASE does works on one aircraft for free, forever. Pro only lifts the aircraft limit; it never unlocks a checklist, a card or a procedure.

Free

€0

No trial, no expiry

One aircraft, fully featured
Checklists, flows, reference cards
Airfields and the scratch pad
iCloud sync and export

PHASE Pro

€2.99

per month · cancel any time

Unlimited aircraft
Each tail with its own library
Switch aircraft in one tap
Everything in Free

Can't afford Pro? Message me from the app and I'll send you a free code, no questions asked. And if PHASE has been useful, there's an optional tip jar in Settings that goes straight toward fuel and flight time. The App Store shows prices in your local currency.

Before you ask

The practical questions.

Which devices does it run on?

iPhone and iPad, on iOS 17 and later. It's a native app, not a web page in a wrapper, so it launches instantly and behaves the way the rest of your phone does. An Android version isn't available yet.

Does it work without a signal?

Completely. Everything lives on the device: your aircraft, checklists, flows and reference cards all work in airplane mode, out of coverage, or in a hangar with no reception. There's no server to reach.

iCloud sync is optional on top of that. Turn it off and nothing stops working.

Who can see my data?

Nobody. There's no account to create and no backend of mine for your library to pass through. If you enable sync it uses your own private iCloud database, which Apple encrypts and which I have no access to.

What does it cost?

Free for one aircraft, with every feature included and a complete example aircraft already built. PHASE Pro is €2.99 a month for unlimited aircraft. If that's out of reach, message me and I'll send you a free code.

I fly several aircraft. Does that work?

That's the design. Each aircraft gets its own checklists, flows and V-speeds, and you switch between them from the picker at the top of the Flight tab. One aircraft is free; more than one needs PHASE Pro.

Things that don't vary by airframe (frequencies, VMC minima) can be marked as shared, so you enter them once and they appear on every aircraft.

Does it work with VoiceOver and larger text?

Yes. Checklist rows read as a single item in cockpit order, including whether they're critical, optional or already ticked. Text scales with your Dynamic Type setting, and looping animations stop when Reduce Motion is on.

Can I import my checklists from another app?

Not directly. PHASE reads its own export files, so you can share a checklist or an entire aircraft with another PHASE user, but there's no importer for ForeFlight or similar formats yet.

For a first setup, building from your POH by hand is usually a single evening, and it means you've read every line, which is no bad thing for a checklist you intend to fly.

What happens if I change phone or delete the app?

With iCloud sync on, your library restores itself on the new device. Either way you can export an aircraft bundle at any time and keep it as a file; your setup isn't trapped in the app.

Can my flying club share one library?

Yes, and it's one of the better uses for it. Build the aircraft once, export the bundle, and send it to everyone on the schedule. It arrives on their device as a new aircraft, so nothing of theirs is overwritten.

Can I use it instead of the aircraft's checklist?

No. PHASE is a convenient way to carry and run checklists you've built from your aircraft's approved POH/AFM; it isn't an approved source itself, and the examples it ships with are generic. Fly the approved checklist.

Still in the hangar

Be first to fly with it.

PHASE is still in development: 25 checklists, 3 flows and 9 reference cards already built and working, with runways, frequencies, airfield notes, alternates and a scratch pad added since. Leave your email and you'll hear the moment it's ready to fly.

Landing on the App Store first, Android to follow.

PHASE is not your POH

The checklists that ship with the app are generic single-engine examples, there to show you the shape of the thing. Build your library from your aircraft's approved POH/AFM, and fly the approved checklist. Software is a convenience; the manual is the authority.