Production-grade SaaS,
built right the first time.
We design and build multi-tenant SaaS platforms, web apps and payment systems that are secure, scalable and ready for real customers. The kind of software people rely on every day, not a throwaway demo.
One platform, or many products
Every module runs on its own or plugs straight into your stack. Explore the lineup.
Migrate
Switch platforms without the fear
Learn more →Insight
Analytics that drive growth
Learn more →Billing
Subscriptions, dunning, Direct Debit
Learn more →Booking
Class booking and waitlists
Learn more →Engage
Campaigns and automations
Learn more →Portal
White-label member app
Learn more →Academy
Technique library and programs
Learn more →Ranks
Belts, gradings and promotions
Learn more →Staff
Rotas, timesheets and payroll
Learn more →Retail
Shop, POS and inventory
Learn more →Notify
Email, SMS and push messaging
Learn more →Reputation
Collect and reply to reviews
Learn more →Rewards
Gift cards and referrals
Learn more →Comply
Audit trail and GDPR tooling
Learn more →Switch platforms without the fear.
Move your members, classes, schedules and history across in a weekend. Validated, dry-run first, with full rollback if anything looks off.
- Members, contracts and history intact
- Dry-run and one-click rollback
- Zero downtime for your members
Know your numbers. Grow on purpose.
Revenue, retention, churn and lifetime value, live across every location. The metrics that actually move a membership business, in one place.
- MRR, churn and LTV in real time
- Cohort retention and engagement
- Every location in one dashboard
Get paid, automatically.
Recurring subscriptions, smart dunning and Direct Debit, with failed payments chased and recovered without you lifting a finger.
- Stripe and GoCardless in one flow
- Automatic dunning and recovery
- Live collection and revenue view
Fill every class.
Real-time class booking, waitlists and capacity tracking, with QR check-in and an embeddable widget for your own site.
- Live capacity and waitlists
- QR check-in at the door
- Embeddable booking widget
Win members back on autopilot.
Visual automations, broadcast campaigns and lead capture across email and SMS, triggered by what members actually do.
- Drag-and-drop automations
- Email and SMS together
- Triggered by member behaviour
Twenty systems, one studio
Standalone products, or one connected platform — here is everything we design and build.
Migrate
Painless migration off any legacy platform
Insight
Revenue, retention and churn analytics
Billing
Subscriptions, dunning and Direct Debit
Booking
Class and appointment booking with waitlists
Engage
Marketing automation and campaigns
Portal
White-label member app and portal
Academy
Video library and structured programs
Ranks
Belts, gradings and promotions
Staff
Rotas, timesheets and payroll
Retail
Shop, POS and inventory
Notify
Email, SMS and push messaging
Reputation
Reviews, responses and NPS
Rewards
Gift cards and referrals
Comply
Audit trail and GDPR tooling
Spar
Partner and sparring matchmaker
Tournaments
Brackets and event management
Streaks
Leaderboards, streaks and achievements
Sites
White-label marketing site builder
Connect
Public API and webhooks
Journal
Training journal and progress tracking
Services
Full-stack software built on solid foundations, so you are not paying to rebuild it in six months.
Multi-Tenant SaaS
End to end SaaS builds with secure tenant isolation, authentication, billing and admin. Built multi-tenant from day one, never bolted on later.
Web Apps and MVPs
From the first idea to a launched product, with clean, typed and documented code your team can keep building on.
Payments and Billing
Stripe and GoCardless integration done properly, including subscriptions, webhooks, Direct Debit and billing that stays in sync.
Architecture and Review
System design, database modelling and code review for teams that need to get it right the first time.
What we've built
Software that handles real users, sensitive data and live payments.
Multi-Tenant Gym SaaS
A multi-tenant platform for UK gyms and boutique fitness studios. One secure codebase serves every gym, with per-tenant data isolation (PostgreSQL row-level security), Stripe and GoCardless billing, and white-label mobile apps.
SiteVerified Verification Platform
A credential verification platform that connects buyers, agencies and end clients, with role-based accounts, multi-party signature workflows, ID verification and GDPR-compliant data handling.
About Addaeus
Addaeus is a London based software studio founded by Joel Addai. We specialise in multi-tenant SaaS, the kind of software that serves many customers from one secure codebase, handles real money and is built to scale from day one rather than rewritten later.
We care about getting the foundations right: clean architecture, secure data, payments done properly, and code your team can grow into. If you are building a SaaS product, a billing system or a web app that needs to be done properly the first time, get in touch.
Let's build something solid.
Tell us what you're building and we'll tell you exactly how we'd ship it.
Built with the tools we trust
