Vizalgo
FR

Products

We make the apps you use, and we stand behind them.

Vizalgo is an independent software studio in France. Every product below is ours: we wrote it, we run it, we answer your messages.

See our products
carouselr.com
Carouselr home page: “Code carousels, not code screenshots.” with three example slides.
Carouselr home page: “Code carousels, not code screenshots.” with three example slides.
Screenshots of the live sites, taken 26 October 2026.

Facts you can check

Five products. All of them ours.

  • Carouselr

    LinkedIn carousels with real code blocks. AI drafts the slides from one topic line.

  • einvoicekit

    EU e-invoicing tools for developers: validate EN 16931 invoices and generate Factur-X by API, with a free web validator.

  • craftconform

    Labels for artisan soap and cosmetics, with the 81 fragrance allergens of Regulation (EU) 2023/1545 built in. In French.

  • Calmaboard

    Before you board, reads the weather along your flight’s route and says, in plain words, when bumps are more likely.

    App in development, coming to iPhone and Android.

  • Arfaja

    Shows where the desert in Saudi Arabia and Kuwait turned green, from dated satellite pictures.

    App in development, coming to iPhone and Android.

How we build

Three principles, each with a public trace. Today all three are proven on einvoicekit.

  1. We check against the official rules.

    einvoicekit checks each invoice against EN 16931 and the rules of its own format: XRechnung 3.0.2, Factur-X 1.09 or Peppol BIS Billing 3.0.21.

    Try the free validator

  2. Code you can read.

    einvoicekit’s npm and Python packages are open source under the MIT licence, on GitHub, npm and PyPI.

    Read the code on GitHub

  3. We watch it run.

    A monitor outside Cloudflare checks einvoicekit’s website and API every 60 seconds, and its status page is public.

    Open the status page

A question about one of our products? Write to us. We answer by email.