APEX LUCIS — PRESS KIT
Updated 4 October 2026 · apexlucis.com/press.html · press@apexlucis.com


WHAT THE APP IS

Apex Lucis is a planning and business app for working photographers, available
on iPhone, iPad and Mac. It scores every shooting window across a
photographer's saved locations by combining light quality, the forecast, the
state of the tide and seasonal wildlife activity, ranks the hours worth
driving for, and turns the one they choose into a booking that already carries
the tide and light times for that date and place. Tide predictions are
computed on the device from bundled harmonic data, so they work with no
signal.

Free to download. Apex Lucis Pro is £8.99 a month or £79 a year, with a 30-day
free trial. Requires iOS 26, iPadOS 26 or macOS 26. English only.

Developer: Mark Haskins, trading as Haskins.io — one developer, no funding.
App Store: https://apps.apple.com/app/id6792283828


WHAT IS IN THIS DOWNLOAD

  apexlucis-icon-1024.png        The app icon, 1024px, transparent background
  apexlucis-mark-haskins.jpg     Portrait of the developer
  credits.txt                    Data source attributions — see below
  screen_shot_captions.txt       A caption for each screenshot, ready to use

  Screenshots/iPhone/            Seven screens, captured at native resolution
  Screenshots/iPad/              The same seven
  Screenshots/Mac/               The same seven, 2880x1800, no alpha channel
            .../device-framed/   Each set again in Apple's device frames, transparent

  Video/apexlucis-optimal-windows-30s.mp4
                                 A scan ranking the hours across saved locations, and
                                 the chosen hour becoming a booking carrying the tide
                                 and light times. Captioned, no narration, 29 seconds.


USING ANY OF IT

Everything here may be reproduced in coverage of the app, resized, cropped or
cut, with no credit required beyond the app's name and no need to ask first.
The quotes on the press page may be used the same way, attributed to Mark
Haskins, developer of Apex Lucis.

The one thing that does carry an obligation is the tide data, which is other
people's work: if you quote the station count, please carry the attribution in
credits.txt.


THREE DETAILS WORTH GETTING RIGHT

The tide data comes from two sources, not one. NOAA's published harmonics
cover the United States, about 3,450 stations, public domain; the TICON-4
global dataset covers everywhere else, about 4,840 stations. "8,000 NOAA
stations" is wrong on both counts.

Optimal Windows is not AI. It is deterministic scoring — four measured inputs,
weighted and ranked, and the same inputs always produce the same answer. The
app does use Apple Intelligence, for the wildlife field guides generated on
the device with Apple's FoundationModels framework, but that is a different
feature.

Nothing is uploaded or hosted. Documents are written as files and handed to
the photographer to send on. There is no Apex Lucis server and no account to
create.


ANYTHING ELSE

press@apexlucis.com — for a Pro review code, assets that are not here, a
walkthrough, or any question at all. Interviews and technical detail on the
tide prediction or the ephemeris engine are available on request.

Worth knowing before you open the app: Settings > Sample Data fills it with a
realistic set of bookings, clients, invoices and locations. A fresh install is
an empty diary, and the thing worth looking at is invisible until there is a
job in it.
