
GymWren
Memberships, recurring billing and class scheduling for independent gyms and boutique studios.
I work on the whole thing: product decisions, design, code, deployment, and the boring parts that make software trustworthy, like roles, audit trails, backups and tests.
Selected work
Client systems built requirement by requirement and tested end to end before handover, plus the products and platforms I ship on my own.
What I build
One person from first sketch to production, so nothing gets lost between a designer, a developer and an ops team.
Native SwiftUI apps with StoreKit 2 subscriptions, SwiftData and widgets, designed to pass App Review the first time.
Multi-tenant products with sign-in, two-factor, billing, dashboards and APIs, deployed and monitored.
ERP, POS, HR, inventory and billing systems with roles, approvals, audit logs and offline-ready phone apps.
Animated marketing sites that convert, and practical AI inside your product: Claude, OpenAI and private on-device models.
We turn your idea or requirements into a written spec, so we agree on what gets built before any code.
I build in small steps and share a working demo you can click through, so there are no surprises.
Deployment, App Store submission, data migration and handover documentation.
Fixes, updates and new features after launch, as your business grows.
Business management systems
Multi-tenant SaaS with sign-in, two-factor, roles, billing plans and audit logs. Many come with phone apps for staff or customers. Open any one and click around with the demo logins.

Memberships, recurring billing and class scheduling for independent gyms and boutique studios.

Multi-clinic system for US outpatient clinics: patient records, appointments, charting and billing.

Point of sale, kitchen display and recipe-level stock for independent restaurants and small chains.

Multi-warehouse stock control on a tamper-proof movement ledger, with offline barcode scanning.

Reservations, folios, housekeeping and night audit for independent hotels, with availability that cannot oversell.

Admissions, attendance, exams and fee collection for K–12 private schools.

HR system for 20–500 person companies. One employment record drives the org chart, time, leave and pay.


Double-entry accounting with invoicing, bank reconciliation and tax rules for small businesses and their accountants.

Course delivery, quizzes and certificates for training companies and independent educators.

Leases, rent roll, arrears and maintenance for landlords and property managers.

Online booking, staff rosters and no-show protection for salons, barbers and spas.

Trips, maintenance and proof of delivery for fleets that need a real cost per kilometre.

Work orders, technician scheduling and on-site invoicing for HVAC, electrical, plumbing and equipment service companies.

Ticketing, registration and on-site check-in for conferences, workshops and community events.

Catalogue, circulation and a phone-friendly public catalogue for school, college and community libraries.

Demos run on free hosting, so the first visit can take up to a minute to wake up. All demo data is made up.
Website templates
Next.js templates with cinematic photo motion, built for real businesses: cafes, clinics, schools, gyms, restaurants and more. Every one is editable from a single content file.
NEW · PREMIUM
















On the App Store
Native SwiftUI apps across 15 categories, from finance and health to education and sport. Tap any app to open it on the App Store.
Products
The kits and apps that came out of shipping everything above. See all in the Sass Products Hub store →

$49 one-time
Turn any video into accurate subtitles in up to 100 languages, privately on your Mac. No subscription, no uploads, no per-minute fees.

$69 one-time
A SwiftUI starter kit with native StoreKit 2, SwiftData, and a built-in Guideline 4.3(a) anti-spam system plus a full App Store compliance checklist — from a developer who's shipped 50+ apps.

$49 one-time
Ship an AI product this weekend — a Next.js 15 starter with auth, a credit-based billing ledger, and a streaming AI chat that all run offline with zero cloud keys.

$29 one-time
Three runnable Claude API automations in real Python — content repurposing, customer-voice mining, and grounded support drafting — with the prompt engineering and structured output already done.
Let's talk
Tell me what you want to build. I reply within two business days with questions, a plan and a quote.