App & Software Development

When off-the-shelf software
isn't enough anymore.

Apps, custom software and integrations – built for your business, not the mass market. From Bensheim, with one point of contact who stays.

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iOS & Android Web apps REST APIs GDPR-compliant 100% your code
What we build

Tools, not
workarounds.

Real code · the booking system of this website
// Book a slot – running live // on cogswell.de const r = await fetch(API + '/book', { method: 'POST', body: JSON.stringify({ service, start, name, email }) }); if (r.status === 409) { reloadSlots(); // slot taken }

Integrations you can touch.

That's not sample code above – it's the actual call this website uses to book appointments. That's how concrete our work is.

Discuss your project →

Custom software.

When spreadsheets and isolated tools slow you down: software that fits your workflow exactly.

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Integrations.

ERP, CRM, calendars, accounting: connected instead of CSV exports. Where no API exists, we build one.

Connect your systems →

We build our own.

Our client app is on the App Store and Google Play, and our CRM and this website's booking system run on our own software. You see what you get.

View the app →

Operations & evolution.

After launch we stay on it: updates, monitoring and new features as your business grows.

Maintenance plans →

Understand first, then build.

We don't start with code – we start with your workflow. Then we develop in stages so you can test early and never pay while flying blind.

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Everything here runs on
our own software.

Client app, CRM, appointment booking, automations: what we offer you is what we use ourselves every day. A glimpse.

Booking system: calendar view with free slots Cogswell Hub app: appointment overview
Cogswell Hub app: membership card Automation: connected systems Voice agent: conversation overview
Cogswell Hub app: invoice overview Microsoft 365 integration

A closer look.

iOSAndroidWeb appsREST APIsWebhooksSupabaseStripeMicrosoft 365PostgreSQLGDPR-compliant

Off-the-shelf software forces your business into its workflows.

We build the other way round: your workflow, your code, your tool.

100 %your code, your access, your docs – no lock-in.
1point of contact from the first call to daily operations.
30 minfree initial consultation – with an honest effort estimate afterwards.
How it works

Four stages.
No flying blind.

1

Initial consultation

30 minutes, free. We understand your problem and tell you honestly whether software is the right answer.

2

Concept & prototype

You get a clickable draft and an effort estimate before actual development starts.

3

Development in stages

We deliver in short increments. You test early, give feedback and keep costs under control.

4

Launch & operations

Release, onboarding, maintenance. Code, access and docs belong to you.

Straight answers.

What does an app or custom software cost?
We bill fairly by the hour. After the free initial consultation you get an honest effort estimate with an hourly rate, and you only pay for the hours actually worked. We often deliberately start small with an MVP so you can see early on whether the investment pays off.
Native app or web app?
We decide that together based on your case, not our taste. A web app is often enough and saves app-store overhead. Native is worth it when you need push notifications, offline mode or device features. We build both and tell you honestly what makes sense for you.
Who owns the code in the end?
You do. Source code, access and documentation belong entirely to you. You can continue without us at any time or hand things over to another provider. No lock-in – that is a principle for us.
Can you connect our existing systems?
In most cases, yes. We connect ERP, CRM, calendars, accounting or industry software through existing interfaces, and where none exists we build a clean REST API. Whether your system plays along is something we clarify in the initial consultation.
How long does development take?
A first usable version (MVP) is often achievable in 6 to 12 weeks depending on scope; a single integration can be much faster. We develop in stages so you can test early and never pay for months of flying blind.

Which tool is your business missing?

Bring the idea to a free consultation. Within 30 minutes we'll tell you whether and how it can be built – and roughly what it costs.

Book a free consultation