YelloGem
Software Studio · Switzerland

We design and engineer world-class apps & management systems for the places people go to play.

The Swiss Software Factory.

Simply Built. Changes the country named in the headline.

See the work Start a project
0Flagship products 0+Platforms shipped 100%In-house build
What we do

We build the software that runs ski resorts, marinas, yachts, restaurants and venues. Guest-facing apps, and the systems behind the counter.

01

Guest apps

Native iOS & iPad experiences your customers actually want to open. Fast, tactile, alive.

02

Management systems

The admin engine behind every app: bookings, staff, inventory, live operations, analytics.

03

End to end

Strategy, design, engineering and App Store delivery. One studio, one accountable team.

04

Built to last

Offline-ready, real-time, and tuned for the field: mountains, marinas and open sea.

Selected work · 2025 / 2026

Flagship
builds

Five products. Each one a guest app and a full management system, shipped end to end by YelloGem.

(01 / 05)
Mountain · Ski Resort

Helmos

Ski resort app & resort management system

Your mountain, your rules. Helmos puts the whole resort in your pocket: a live, dynamic map of open lifts, slopes and services, VIP parking and concierge, plus a gamified layer that tracks vertical metres and pits friends against the mountain.

  • Live lift & slope map
  • Resort services
  • VIP parking
  • Vertical tracking
  • Leaderboards
  • Multi-language
View on App Store
Helmos
9:41
PLAYRank
1 · Niko P.18.4k
2 · Elena K.16.1k
3 · You15.8k
4 · Marco14.2k
9:41
HELMOSLive
1,240mVertical today
Gondola · KefalariOpen
Chair 4 · StygaOpen
Chair 7 · NeraidaHold
(02 / 05)
Watersports · No.1 System

Lagoon

Watersports booking & centre management

Watersports, and so much more. Book a session in under a minute, skip the activity desk, and walk to the boardwalk with your pass already loaded. Every booking becomes a QR boarding pass, and the Lagoon Owner admin system runs the whole centre stress-free.

  • 60-second booking
  • QR boarding pass
  • Live sea conditions
  • Skill tree & rewards
  • Owner admin app
  • Auto photo gallery
View on App Store
Lagoon
9:41
CONDITIONSNow
Wind14 kn
Swell0.4 m
VisibilityGood
TideRising
9:41
LAGOONPass
Boarding pass Kitesurf · 14:00 Locker 22Wetsuit MInst. Dion
(03 / 05)
Luxury · Yachting

Charter

Yacht concierge & charter management

A discreet digital companion for luxury yachting. Charter connects guests with captain and crew for bespoke itineraries, on-demand dining and seamless amenities, while a live Provisioning & APA tracker keeps the whole charter transparent, even offline at sea.

  • Horizon route planner
  • Chef & menus
  • Discreet service bell
  • Live APA tracking
  • Amenity booking
  • Offline at sea
View on App Store
Charter
9:41
APALive
68%Provisioning used
Dining€4.2k
Fuel€2.1k
Excursions€1.3k
9:41
CHARTERHorizon
Hydra→ Spetses · 14 nm today
Chef · Sea bream crudoToday
Seabob · SundeckReady
(04 / 05)
Hospitality · POS

YelloTable

Point-of-sale for restaurants, clubs & bars

A world-class POS built for the rush. Visual floor plans, lightning-fast ordering, split and merge bills, real-time kitchen routing and live takings, engineered to keep restaurants, clubs and bars moving on the busiest night of the year.

  • Floorplan & tables
  • Split & merge bills
  • Kitchen display
  • Inventory
  • Staff & shifts
  • Live analytics
In production
POS
21:08
KITCHENFire
T12 · Ribeye ×2Fire
T07 · Sea bassPrep
Bar · Negroni ×3Up
T04 · TiramisuHold
21:08
YELLOTABLEOpen
€1,840Takings · tonight
Table 12 · 4 covers€184
(05 / 05)
Events · Ticketing

Axxess

Ticket sales & event management

Sell, scan and run the whole event. Axxess handles tiered pricing and instant QR / NFC entry, scans the gate in real time, and gives organisers a live read on capacity, takings and attendees, from the box office to the door.

  • QR / NFC entry
  • Tiered pricing
  • Gate scanning
  • Attendee CRM
  • Box office
  • Live capacity
In production
Axxess
22:34
TIERSSales
Early birdSold out
General · €25412 left
VIP · €6038 left
Table · €4006 left
22:34
AXXESSGate A
Scan to enter Admitted · GA
Capacity1,284 / 1,500
22:34 · Gate AValid
22:33 · Gate AValid
22:33 · Gate CUsed
Run 06 to 11

More of
the line

Platforms, tools and systems in build or already running, for our own clients and for YelloGem itself.

06

CoZone

Live
Coworking · Casablanca

Coworking, private offices and studios in Casablanca, run end to end: a member app that carries the whole membership, an admin app for the front desk, and a web member portal.

07

RKB Workspace

Live
Automotive · Internal platform

One place for the work, docs and decisions behind a car marketplace that takes private sellers to dealer auction: spaces, boards, backlog and sprints, timeline, docs and reports, with a companion phone app.

08

Diaski

In build
Music · Distribution

Music distribution for Morocco and the wider MENA region. Artists release to every major streaming platform, split the revenue automatically, and get paid in local currency.

09

Matmura

In build
AI · On-premise

An AI appliance that runs entirely on a company's own hardware. Nothing leaves the building. Built for organisations that cannot send their data to a cloud.

10

Tunnel

In build
Secure messaging

Encrypted messaging for people working in hostile environments. A post-quantum key exchange, and a relay built so that breaking into it yields nothing but padded ciphertext.

11

Workspace

In build
Client platform

The workspace every YelloGem client gets: open a ticket, request a change, and see what shipped, without an inbox thread or a shared spreadsheet.

Capabilities

What we
engineer

One studio, the full stack, from the first sketch to the App Store and the system running behind it.

01

Native Apps

iOS & iPad experiences that feel hand-crafted: tactile, fast, and a pleasure to open.

02

Management Systems

The operational engine: bookings, staff, inventory and real-time control rooms.

03

Point of Sale

Hospitality-grade POS that survives the Friday-night rush without a stutter.

04

Ticketing & Access

QR / NFC entry, gate scanning and live capacity for events of any size.

05

Product Design

Interface, motion and brand: the craft that makes software feel inevitable.

06

Realtime & Maps

Live conditions, dynamic maps and offline-first sync for the field and the sea.

The line

How a build
happens

No discovery theatre, no handover to a delivery team that was not in the room. The people who design it are the people who ship it.

  1. 01

    Scope

    We spend time in the operation (the lift queue, the activity desk, the pass, the kitchen) and write down what actually has to work before anyone opens a design tool.

  2. 02

    Design

    Interface, motion and brand together. You see real screens early, on a real device, not a slide deck describing them.

  3. 03

    Build

    The guest app and the system behind it are built as one piece, because that is how they are used. Offline-first where the signal fails.

  4. 04

    Ship & run

    Through App Store review and into your season. Then it keeps running, and you have somewhere to ask for the next change.

By the numbers

Small studio, serious output.

0
Flagship products shipped end to end
0+
Apps live across iPhone, iPad & Mac
0%
Designed & engineered in-house
0★
Average rating from the people who run on it
The studio

YelloGem is a software studio that builds guest apps and the management systems behind them: end to end, in-house, from Switzerland to the world.

We work where hospitality, leisure and the outdoors meet technology: ski resorts, watersports centres, super-yachts, restaurants and venues. The kind of places where the software has to work in the cold, on the water, and on the busiest night of the year.

Every project ships as a pair: a polished app your guests love, and the operational system your team relies on. One accountable team, one standard: simply built.

StudioYelloGem
Based inSwitzerland
DisciplineDesign · Engineering · Delivery
PlatformsiOS · iPad · macOS · Web
For clients

Your project,
live.

Every YelloGem client gets a workspace, not an inbox thread and not a shared spreadsheet.

  • Open a ticket when something is wrong, and watch it move.
  • Request a change and see where it sits against everything else.
  • See what shipped: every release, in plain language.
Email us for access
Start a project

Let's build.

Have a venue, resort, marina or idea that needs an app and a system behind it? Tell us about it.

contact@yellogem.com +41 76 287 92 38