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Apostolos Apostolidis

Creating apps, music & stories

  • Intro
  • Software
  • Music
  • Stories

Introduction

Engineer by profession. Creative in more than one medium.

I’m Apostolos — Tolis for short — an iOS developer based in Gothenburg. I have been writing code professionally since 2013 and building iOS apps since 2016, and today I work on the iOS apps at Etraveli Group. Software is my craft, and it is what most of this site is about.

But I have always created in more than one medium. Alongside code, I have released music since 2011 and, more recently, written stories.

Where AI fits in

AI has been a genuine gift to someone with interests as spread out as mine. It does not replace the craft — it removes the bottlenecks between disciplines, so I can take ideas further in areas where I don’t have a whole team behind me. To be clear about what is mine:

  • Personal apps My own products Native apps I design, build and maintain on my own time, for iPhone, iPad, Apple Watch, Vision Pro and Mac. On the App Store →
  • Music Completely AI-free Published since 2011, first as Out Of The Circle, now as Jovian Outpost. No AI is used anywhere in writing, playing or producing the music. Since 2011 →
  • Stories Bedtime stories, illustrated with AI So far I have published the bedtime stories I tell my children. The words are my own; I use AI to bring them to life visually. In Swedish & Greek →
  • Experience
  • KnowTrail
  • 3Dply
  • Poke XP Calc
  • Articles
  • Talks

Experience

From dialogue systems to iOS apps.

  1. iOS Developer Etraveli Group · current Developing and maintaining the company’s various iOS apps.
  2. Mobile Developer TietoEVRY · Semcon (consulting) Building mobile apps for clients as a consultant.
  3. Software Designer Talkamatic Where my career started, specialising in dialogue systems.

Beyond mobile, I have experience in backend design (mainly Python) and web frontend (JS + Angular). On my own time, I sell and maintain KnowTrail for iOS, iPadOS, watchOS and visionOS, 3Dply for macOS and Poke XP Calc for iOS.

My academic background in linguistics and computational linguistics gives me an interdisciplinary approach to building applications and interfaces. What drives me is creating user-friendly, practical applications that let people focus on the task — not on how to beat the interface.

Programming
Since 2013
iOS
Since 2016
Focus
Swift, SwiftUI, accessibility
Also
Python, JS + Angular
Background
Linguistics & computational linguistics

KnowTrail

  • iPhone
  • iPad
  • Apple Watch
  • Vision Pro

KnowTrail lets you identify the places around you and also houses a fun geography game — on iPhone, Apple Watch, iPad and Vision Pro.

Download KnowTrail on the App Store Privacy policy

3Dply

  • Mac

3Dply converts your iPhone spatial videos into 3D videos ready for YouTube — no technical knowledge required.

Drop in a .MOV recorded on iPhone 15 Pro or later, choose your quality, and the app handles the rest. Your friends and family can then watch your memories in full 3D, right from YouTube.

Download 3Dply on the Mac App Store Privacy policy

Poke XP Calc

  • iPhone

A small but practical iOS app that lets you track and project your progress in Pokémon GO.

Download Poke XP Calc on the App Store Privacy policy

Writing

Articles on Swift & SwiftUI

  • Preparing Your iOS App for (Agentic) SiriMedium →
  • Handle Firebase & Google authentication on macOSMedium →
  • Unit Testing in Swift with Dependency InjectionMedium →
  • Building an Apple Watch app in SwiftUIMedium →
  • Extending Enums in SwiftMedium →

Speaking

Talks

Event flyer: Digital tillgänglighet, t12t meetup in Gothenburg

Digital tillgänglighet — t12t meetup i Göteborg

25 March 2026 · Gothenburg, Sweden

Download slides ↓
CocoaHeads Göteborg meetup

VIPER: A radical iOS architecture — CocoaHeads Göteborg

25 September 2024 · Gothenburg, Sweden

Download slides ↓

KnowTrail

Privacy Policy

KnowTrail does not collect, store, or transmit any personal information.

Location features are processed on-device or via Apple's native frameworks. No data is sent to our servers, and no information is shared with third parties.

We do not use analytics SDKs, advertising networks, or any form of user tracking.

If you have any questions, contact us at apost.tolos@icloud.com.

3Dply

Privacy Policy

3Dply does not collect, store, or transmit any personal information.

All video processing is performed entirely on your local machine. Your video files are never uploaded to external servers and no data is shared with third parties.

We do not use analytics SDKs, advertising networks, or any form of user tracking.

If you have any questions, contact us at apost.tolos@icloud.com.

Poke XP Calc

Privacy Policy

Poke XP Calc does not collect, store, or transmit any personal information.

All data you enter is stored locally on your device and is never shared with any third party.

We do not use analytics SDKs, advertising networks, or any form of user tracking.

If you have any questions, contact us at apost.tolos@icloud.com.

Jovian Outpost

Jovian Outpost
Signal received Origin: Gothenburg, SE Freq: Synth / Guitar
Jovian Outpost artwork: two open hands lit in red
Fig. 01 — Outpost

// 001From the depths of the solar system an abandoned outpost transmits nostalgic sounds made by synthesized instruments and enhanced by high-energy guitars.

// 002There are rumors that the people behind these transmissions are based in Gothenburg, Sweden, and that their first efforts were manifested as atmospheric crust under the name Out Of The Circle.

// 003Since then they discovered the electronic scene and set out to combine intense rhythms with atmospheric melodies in their own way.

Tune in

Minotaurus & Oliver

One journey north, told in two languages

  • Omslag: Minotaurus & Oliver – En Resa Norrut, Apostolos Apostolidis
    Svenska

    Minotaurus & Oliver:
    En Resa Norrut

    Apple Books ↗ (opens in a new tab)
  • Εξώφυλλο: Μινώταυρος & Όλιβερ – Ταξίδι στα Βόρεια, Απόστολος Αποστολίδης
    Ελληνικά

    Μινώταυρος & Όλιβερ:
    Ταξίδι στα Βόρεια

    Apple Books ↗ (opens in a new tab)
© 2026 Apostolos Apostolidis
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