SEQUENCE

Build · Portals, platforms & installable apps

Custom App Development for Brands & Businesses

Some jobs outgrow a website. When the work is a login, a workflow or a tool your clients use every week, we build that too.

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In short

Sequence builds custom web applications: client portals, member and course platforms, booking and ordering systems, internal tools, and installable apps that live on a phone's home screen. We design the interface the way we design a campaign — around what the person on the other end has to do — then build it as software you own. One codebase serves desktop and mobile, your data stays in your own database, and nothing is rented per seat.

See it working

Laptop showing a 1/2 Penny product page with the red notice that DTF prints ship on their own circled, labeled 'A print rule the store enforces'.
1/2 Penny WholesaleA print rule the store enforcesDirect-to-film prints ship on their own. The product page says so in red, and the cart holds an order that mixes them.
Laptop showing a 1/2 Penny product page with the wholesale price masked and 'sign in to see it' circled, labeled 'Price hidden until approved'.
1/2 Penny WholesaleThe trade price, lockedPrices stay out of the page entirely until a buyer is approved — not hidden with CSS.
Laptop showing an AI-drafted follow-up email in the Groundwork demo CRM, with the 'Approve & Send' button circled, labeled 'AI drafts it. You approve.'
Groundwork · demo CRMFollow-ups that write themselvesOne click drafts the email from the record. You edit it and approve it before anything goes out. Shown on our demo CRM.
Two phones showing the 1/2 Penny homepage and a product page, with the 'Apply for wholesale' button circled, labeled 'Apply from the phone'.
1/2 Penny WholesaleDesigned on the phone firstHer buyers browse and apply from their phones, so that is where every screen started.

What you get

Client portals with logins, files, approvals and payments

Member, course and community platforms

Booking, ordering and quoting systems

Installable apps that run on any phone from one codebase

Team logins with roles and two-step sign-in

Owned outright — your code, your database, no per-seat fees

We run this studio on software we built: proposals clients accept online, contracts they sign, invoices they pay, a client portal, and the admin behind all of it. For 1/2 Penny Wholesale we built a trade platform carrying 1,947 designs and 12,072 variants, with wholesale pricing locked server-side to approved buyers.

Scoped per build

Questions

Do you build iPhone and Android apps?

Most businesses are best served first by an installable web app: one codebase that installs from the browser to the home screen and works on every phone, with no store review between you and an update. If a store listing genuinely earns its place, we will tell you what that phase takes and whether we are the right team to build it.

What does a custom app cost?

It is quoted per build, because a client portal and a full ordering platform are different jobs. We scope it with you and give a fixed figure before anything starts.

Who owns the code?

You do. The codebase, the database and the domain are yours, so any developer can work on it later — including us, if you want us to.

Can it connect to the tools we already use?

Usually, yes. Payments, email, calendars and accounting are the common ones. We check every connection in the scoping call rather than promising it on a sales page.

Also from Sequence

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Let's scope it

Tell us the goal and the deadline. We'll come back with what it takes and what it costs.

Start a project