Meet Lagless — Beat jet lag before takeoff

Travel

Lagless

Beat jet lag before takeoff.

What Lagless does

Lagless plans your jet-lag adjustment, day by day, so you land sharp.

You tell it three things: where you're flying from, where you're landing, and when. Lagless then builds a custom 1–4 day light, sleep, and meal schedule — based on the Eastman/Burgess phase-shifting protocols used by Olympic teams and sleep labs — and exports the whole thing into your Apple Calendar in one tap.

Why not Timeshifter? Timeshifter ($24.99/yr) is the dominant app — but it requires an account, runs only when you're online, and locks every plan after the trial behind a subscription. Lagless costs $0, requires no email, has no servers, and works on the plane with airplane mode on.

What's in v1:

— Trip planner: pick your departure city, destination city, departure time, return time, and whether you're a morning or evening person. The schedule rebuilds instantly. — Day-by-day schedule: pre-flight, in-flight, post-arrival — each day shows your bright-light window, dark window, suggested sleep window, caffeine cutoff, and optional melatonin timing. — Calendar export: one tap pushes every action into a dedicated Apple Calendar called 'Lagless — Trip Name'. Delete the calendar when you're home and it's all gone. — Why this works: each step has a one-sentence explainer ("morning bright light advances your body clock by ~1 hour") so you understand the plan, not just follow it. — Trip journal: log how rested you felt on arrival; over time Lagless adapts the chronotype assumption to you.

No account. No internet. No subscription. Works on the plane, in the train, anywhere.

Pack it before your next long-haul.

A look inside

Tap any screenshot to open the full-resolution version.

What's inside

• Trip planner — Pick departure city (timezone), destination city (timezone), departure datetime, return datetime, and chronotype (morning/evening person). Plan rebuilds in <100ms on a phase-shift rules engine bundled on-device.
• Day-by-day schedule — Each day from 'today' through 'arrival + N' shows your color-coded bands: bright-light (yellow), darkness (navy), sleep (indigo), caffeine cutoff (amber), optional melatonin dose (teal). Tap a band for the why-this-works micro-lesson and source citation (Eastman 2003 / Burgess 2013 — bundled text).
• One-tap Calendar export — Push the entire plan into a dedicated, named Apple Calendar ('Lagless — NYC → Tokyo, Jun 4') via EventKit. Each action is a calendar event with the explainer in the notes field. Delete the calendar to remove every event — Lagless does not retain anything in your Calendar app once you delete it.
• Smart reminders — Local UNUserNotificationCenter reminders fire for the next action ('Bright light now — sit by a window or step outside for 30 min'). Snooze, mute, or disable per trip. No background fetch, no servers.
• Trip journal + chronotype learning — After arrival, rate how rested you felt (0–10) and add a note. Lagless suggests chronotype adjustments for future trips when patterns emerge (e.g., 'East-bound trips: try shifting your prep 12 hours earlier next time'). On-device only; never shared.
• Why-this-works lessons — 12 short illustrated cards (2–3 sentences each) explaining circadian rhythm, phase response curves, light's effect on melatonin, why morning light advances East-travelers, why evening light helps West-travelers. All text bundled in app.

Why we built it

Jet lag costs sharp travelers 1–4 productive days per long-haul flight, and the science-backed pre-trip light/sleep adjustment is genuinely effective — but the dominant app (Timeshifter, $24.99/yr) demands an account, a network connection, and a subscription that disappears the plan the moment you cancel. Stop Jet Lag…

What makes it different

Lagless is the only jet-lag planner that requires no account, no internet, and no subscription, and exports the entire pre/in-flight/post-arrival schedule directly into Apple Calendar in one tap — including bright-light, dark, sleep, and optional melatonin windows derived from the Eastman/Burgess phase-shifting protoc…

Who it's for

Built for anyone who values fast, private, on-device software with a calm, focused UX.

In one line: Beat jet lag before takeoff.

Try it

See the Lagless app page for the full feature list, the info table, and support links.

Use Lagless, found a bug, or have a feature request? Comments are open below — anonymous is fine.