Subscriptions
monthly or per cycle, with automatic collection and dunning
Sector
Apps for fitness coaching and studios
Move from one-off sessions to subscriptions, with a web app to sign up and a mobile app to train.
- Abonnements
- Application mobile
- Suivi de progression
- 1
- Work cited
- 3
- Expertise involved
- 4
- Markets served
- 3
- Languages by default
A coach's income rests on regularity, not on session count
Selling sessions one at a time plateaus fast: every month starts from zero. Subscriptions change the economics — predictable revenue, business value, and a client who commits stays longer. Provided that subscribing, booking and tracking progress fit in an app people open without thinking.
What we have built
MH Defense, in Sarrians, is a women's self-defence studio led by a karate world champion. The site offers three membership plans with progressive discounts, a free trial class, online booking and a personal area. It is the same foundation a coaching business needs.
Web and mobile do not serve the same purpose
The web app carries what you do sitting down: subscribe, pay, build a programme, review history. The mobile app carries what you do standing up: check into a session, log weights, get a reminder, read the day's programme offline in a gym with no signal. Both share the same accounts and data; we write the mobile side in React Native, published to both stores.
What we put in place
Slot booking
one-to-one or group classes with limited places
Personalised programmes
with sets, loads and progression
Notifications
for session reminders and inactivity follow-up
Progress tracking
measurements and photos, visible to coach and client
Coach area
diary, clients, payments, attendance rate
Budget and timeline
From €18,000 and eight weeks for the web app with subscriptions. Allow a further €25,000 and ten to fourteen weeks for the mobile app published on iOS and Android.
Proof
The work that proves it
Platforms and sites in production, viewable online. No mockups, no invented clients.
mh-defense.com
Expertise
The services involved
What we concretely build within this scope.
Subscription SaaS products
Turning a service into a recurring product: trials, plans, automated payment, failed-payment recovery and a self-service customer area.
StripeAbonnementsMulti-comptes
Bespoke web applications
Internal tools, client portals and line-of-business software that replace shared spreadsheets and software nobody uses.
Next.jsPostgreSQLRôles & permissions
iOS & Android mobile apps
A single codebase for both stores: notifications, offline use, accounts and payments. Publication and updates included.
React NativeExpoiOS & Android
Method
How a project runs
A detailed quote before we start, and a staging link from week one: you watch the project progress live, not in meetings.
- 01
Scoping
Goals, site structure, content and features. You get a costed scope, line by line.
1 week - 02
Design
Figma mockups of every screen, desktop and mobile, signed off before any development.
2 weeks - 03
Development
Build, back office, content in all three languages. Staging available throughout.
3 to 6 weeks - 04
Launch & support
Testing, redirects, back-office training, then maintenance and monthly improvements.
ongoing
The technologies used
Those of the work cited on this page. Code only: no WordPress, no Shopify.
- Next.js
- Réservation
- Abonnements
Why us
What sets us apart
Four commitments that hold over time, not four slogans.
100% code, zero proprietary platform
No WordPress, no Shopify, no page builder. Your product is written in TypeScript, documented and version-controlled — the repository is yours from day one, and you are locked in to nobody.
Products, not brochures
User accounts, recurring subscriptions, messaging, gated access, payments: we have shipped five platforms running with real paying customers behind them.
Regulated sectors
Insurance broking, accountancy firms, real estate, financial recruitment. We know the data confidentiality, role-based access and domain constraints these professions carry.
Multilingual by default
FR · EN · ES. Internationalisation is built into the architecture, not bolted on as a plugin six months later — essential in Belgium, Luxembourg and Switzerland.
Questions
Frequently asked questions
Do we really need a mobile app, or is a site enough?
A site is enough to sell and to book. A mobile app earns its place when the client uses it during the session: checking in, logging loads, reading the day's programme in a gym with no signal, getting a reminder. If your use stops at sign-up and payment, we will say so rather than sell you an app to maintain against every iOS release.
How are subscriptions and failed payments handled?
Through recurring collection via Stripe, with automatic dunning on failure and access suspension after a delay you set. Tiered discounts, commitments and trial periods are configured from the coach area, with no further development.
Journal
Further reading
Platforms
What a B2B marketplace costs, and where the budget goes
The six building blocks to plan for, the ones always forgotten, and the real ranges.
Engineering
Why we work with neither WordPress nor Shopify
This is not technical snobbery. It is a question of three-year cost.
Engineering
What a bespoke website really costs
The breakdown line by line, and why a €1,500 quote ends up costing you more.
Let's talk
Got a project? Say hello.
Tell us what you need: within 48 hours you get technical feedback plus a budget and timeline estimate. No commitment.