Custom SaaS DevelopmentWe build SaaS
to your exact spec,
not from a template.
Custom SaaS is engineered to fit your idea precisely, with no compromises forced by a generic tool's limits — and you own it outright. We build bespoke subscription software from scratch, with real billing, the way we built our own. No template, no lock-in.
app.yourmarketplace.com
Live marketplace
Two-sided liquidity, one platform
Supply and demand, matched. Listings, search, payments, and trust — built to move volume.
Recent activity
NNew listinglive
BBroker onboardedverified
EEnquiry matchedsent
PPayment cleared£4,200
Platforms and marketplaces we have built and worked on
sellyourboat.ioKompiPayeuropeanyachtbrokers.combusesforsale.comLoopa
What we buildBuilt to fit exactly,
owned completely.
Custom means no forced compromises and no rented platform. We engineer your SaaS to your requirements, and hand it over.
01
Built to your spec
Engineered from scratch to do exactly what your product needs.
02
No template limits
None of the forced compromises of configuring a generic tool.
03
Real billing
Proper subscriptions on Stripe, built into the custom product.
04
Owned outright
No per-seat platform fee draining margin forever — it is yours.
05
Yours to extend
The full codebase, so you can change and grow it freely.
Custom SaaS fits your idea, instead of your idea fitting a tool
Every off-the-shelf SaaS builder and no-code platform makes the same quiet trade: you get live faster, but your product has to fit within the tool's limits. For many things that trade is fine, and when it is, we will say so honestly. But when the SaaS is the business you are building — the product people pay for, the thing that has to be exactly right — those limits stop being a convenience and become a ceiling.
Custom SaaS removes the ceiling. Because it is engineered from scratch to your requirements, it does what your product actually needs, not the nearest thing a template allows. There are no awkward workarounds, no features you cannot have because the platform does not support them, no compromises baked into your product by someone else's software. It fits your idea, rather than forcing your idea to fit the tool.
That fit matters most precisely when the product is the business. If your SaaS is your company, it should be exactly what you envisioned and fully yours — and that is what building custom gives you.
The ownership caseCustom means you own it, not rent it
The other defining difference of custom SaaS is ownership. A template or no-code build is something you rent — you keep paying for the platform, you cannot fully change what it does, and if the provider raises prices, changes terms, or disappears, your product is at their mercy. For an internal tool that might be acceptable. For the software that is your business, it is a serious risk sitting under everything you build.
Custom SaaS is yours outright. The full codebase, the billing, the infrastructure — handed over on delivery, with no licensing and no lock-in. There is no per-seat platform fee quietly eating your margin as you grow, and no third party who can pull the rug. You can change anything, take it to any team, and build on it forever, because you own it.
This is why the up-front cost of custom is often the cheaper choice over a product's real lifetime: you pay to build once, instead of renting forever while accepting someone else's limits. For a SaaS that is meant to last and to be the business, ownership is not a luxury — it is the point.
ProofWe built our own custom SaaS from scratch
The clearest proof we can offer on custom SaaS is that we built our own, from scratch, with no template underneath. sellyourboat.io is a Wall & Fifth venture: bespoke subscription software we engineered and run, with Stripe billing in production, over 12,000 listings, structured supply, and a Claude-powered AI layer — every part built to fit, none of it configured from an off-the-shelf tool.
Building and operating it means we have done the real work of custom SaaS on our own product: engineering the whole thing to exact requirements, running the billing, and keeping it reliable in production, with our own money on the line. So we build your custom SaaS from having built and shipped one ourselves.
We have also delivered bespoke software and payments work across our client roster including KompiPay. Building custom, ownable subscription software is squarely what we do.
The buildProduction stack, fixed price, owned outright
We build custom SaaS on a real production stack — Next.js, React, TypeScript, PostgreSQL, Stripe for billing, deployed properly — engineered from scratch to your requirements. No template, no no-code assembly: real software, built to fit, that becomes genuinely yours.
We work to a fixed price, which is unusual for bespoke work and deliberately so — it protects you from the open-ended hourly billing custom software usually carries. From 16,000 GBP for a focused custom SaaS, from 30,000 GBP for a larger bespoke build with deeper features, integrations, roles, and admin. Payment processing and any third-party usage is passed through at cost, never marked up.
And you own all of it: the full codebase, the billing setup, the infrastructure, handed over on delivery. No platform you keep paying, no licensing, no lock-in — which, for custom SaaS, is a large part of the point. Yours to run, change, and scale with us or any team you choose.
ProofWe built our own custom SaaS, from scratch
sellyourboat.io is bespoke subscription software we engineered and run — Stripe billing, 12,000+ listings, an AI layer, no template. We build yours the same way.
Stripe
billing we run live
12,000+
listings on our SaaS
PricingFixed price for bespoke work
A defined price for custom software — protecting you from the open-ended hourly billing bespoke work usually carries.
Custom MVP
from £16,000
A focused custom SaaS built to your requirements: the core product, accounts, and real billing.
Extensive Build
from £30,000
A larger bespoke build with deeper features, integrations, roles, and admin, engineered to spec.
Embedded Partner
from £8,000 /mo
Ongoing senior involvement once live: evolving the custom product exactly as your needs change.
Build SaaS that fits
exactly, and is yours.
Tell us what your product needs to do that nothing off-the-shelf can. We will build it to your spec, with real billing, owned outright.