Web application

A web application is software accessed through an internet browser, with nothing to install on the computer or phone, in which identified users view, enter and manipulate data to get work done: managing orders, tracking files, steering an activity. Unlike a website, which presents information, a web application executes processes. It is now the most common form of professional tooling: CRMs, client portals, management software and SaaS products all run on this model.

Web application or website: the difference that matters

A website informs and convinces: it presents the company, its offers and its content to anonymous visitors. A web application gets work done: it serves signed-in users, applies business rules and keeps living data. The test is simple: remove the user accounts and the database, and a website is still a website, while an application no longer exists.

• Website: anonymous visitors, identical content for everyone, a goal of visibility and conversion.
• Web application: identified users, data specific to each account, a goal of operational efficiency.
• Hybrid cases: a website with a client area is already an application on its signed-in side, with the security and reliability requirements that come with it.

What a web application looks like, by function

• Internal management tool: production tracking, field-service management, team scheduling, sales follow-up. The natural replacement for shared spreadsheets once the activity outgrows them.
• Client portal or extranet: your clients check their files, documents, invoices or orders on their own, which reduces phone calls and emails to your teams.
• SaaS: the web application becomes the product itself, sold by subscription to other companies.
• Back office: the behind-the-scenes side of a website or mobile app, where teams manage the catalog, orders and users.

The technology, in brief

A web application combines three layers: an interface that runs in the browser, built with technologies such as React, a server that applies business rules and controls access rights, and a database that keeps the information. On top of that come hosting and deployment, now standardized through containerization. For an executive, the technical details matter less than three guarantees: code that belongs to you, technologies that are widespread on the job market, and hosting you can change.

What a web application costs

For custom development in France, the honest orders of magnitude depend first on the functional scope, far more than on the technology:

• A first useful scope: typically between 15,000 and 50,000 euros for a tool that covers one precise process, with a few user roles and the essential integrations.
• A complete business application: from 50,000 to 150,000 euros and beyond, depending on how many processes are covered, the integrations with your other software and the security requirements.
• Below 10,000 euros: in practice this means configuring existing tools or no-code, not custom development. It can be the right choice, but it is a different product, with different limits.

Custom-built or off-the-shelf?

Custom development is not always justified, and an honest vendor will tell you so. If off-the-shelf software covers 90% of your need for a few hundred euros per month, take it. Custom becomes rational in three situations: when your process is your competitive advantage and no standard tool respects it without contortions, when the sum of subscriptions, duplicate data entry and patchwork between tools exceeds the cost of a tool you own, and when your data becomes an asset to structure rather than a scattered by-product.

The PeakLab perspective

At PeakLab, a custom web application development agency in Paris, the starting point is never the technology, it is the process: who does what, with which information, and where time is lost. The scenario we meet most often: a business run on spreadsheets, emails and two or three poorly connected software subscriptions, where the same data is re-entered several times. The web application replaces that assembly with a single tool, designed for the company's real process, delivered with its source code and hosted wherever the client decides.

Our conviction: a successful web application is rarely the biggest one. Better a reduced first scope, in production within a few months, that eliminates the worst of the duplicate entry and proves itself in use, followed by evolutions guided by reality on the ground, than eighteen months of development on a tool that is perfect on paper and that nobody has used yet.

When to act

The signs that a web application would pay for itself in your organization:

• Your shared spreadsheets have become critical: multiple versions, data-entry errors, nobody knows which one is authoritative.
• Your teams re-enter the same information in several tools.
• Your clients ask for direct access to their information, and your teams spend hours answering follow-up questions.
• A key process of your offer is not covered by any off-the-shelf software without costly contortions.

The useful exercise before any commitment: describe the target process on one page, list the data it handles, and estimate the time your current organization loses every week. This quick assessment tells you whether a web application pays for itself, how fast, and which scope to start with.