Zyloft is an independent software company from Germany. We build our own products: Next.js SaaS starter kits that get developers and founders to launch in days, HookStead for reliable webhooks, and Windows software such as the invoicing app Zyloft Desk. For selected projects, we also take on custom development.
01 / What we sell
Everything we sell is built and maintained by us in Germany, sold as a one-time purchase through Polar.
02 / Featured
Our latest starter kit and desktop software, both ready to buy.
Next.js SaaS starter kit for creators
Available now
For creators and founders selling digital products, courses or memberships: auth, payments, a shop, emails and a landing page that pops, in English and German.
Invoicing software for Windows
Available now
Quotes, invoices and e-invoicing for freelancers, the self-employed and small businesses in Germany. Works offline on your own PC, no subscription.
03 / SaaS
Besides starter kits and desktop software, we run our own SaaS. The first one: HookStead, for webhooks you can trust.
Webhook monitoring & retries
Beta
HookStead sits between your providers and your app: it records every webhook, forwards it with signatures and retries, and shows you exactly what happened at every attempt.
04 / Project support
Alongside our products, we take on a small number of projects each year, with the same stack and the same care.
We install one of our starter kits, adapt it to your brand and features, and take it live with you.
Web apps with Next.js, mobile apps with React Native and Windows software with C# and .NET.
Updates, maintenance and new features, so your product keeps up with new versions and new requirements.
A short email is enough. We reply within two working days.
05 / Tech & philosophy
Three principles guide every product we build, from the first sketch to the release build.
Fast is a feature. We test on real, mid-range phones and slow connections rather than only the newest hardware, and treat load time, smooth scrolling and battery use as requirements.
Typed, tested and modular codebases that stay easy to change. Maintainable software ships updates sooner and breaks less often, which is what users actually feel.
We collect only what a feature genuinely needs, and ideally nothing at all. Your data belongs on your device, not in an advertising profile.
06 / Guides
Invoicing in Germany in plain language: from the mandatory details under § 14 UStG to the e-invoicing mandate, ZUGFeRD and XRechnung.
3 min read
Since 2025, new revenue thresholds and simplified invoicing rules apply to small businesses in Germany. What belongs on your invoice, what doesn't, and where e-invoicing stands.
2 min read
Since 1 January 2025, businesses in Germany must be able to receive e-invoices. Transition periods for issuing them run until the end of 2027. An overview for freelancers and small businesses.
2 min read
Both formats meet the e-invoicing mandate, but they work differently. When to use which, and what to watch out for with ZUGFeRD profiles.
07 / FAQ
What people usually ask before buying or using our software.
Zyloft is an independent software maker from Germany. We build and sell our own products, which lets us focus on doing a few things really well.
Once a product is available, its page has a buy button. The checkout is run by Polar, our reseller (Merchant of Record): they take care of payment, VAT and the invoice, and provide your licence key or access.
We prefer one-time licenses. Where a product needs ongoing work, such as adapting to new tax rules, we offer that as an optional update package, and the software keeps working without it. Each product page states its exact model.
As little as possible leaves your device. Zyloft Desk, for example, stores everything in a database on your own PC. Our software contains no advertising or tracking SDKs, and this website sets no cookies.
Windows 10 and 11 with C# and .NET, iPhone and Android with React Native, and the web with Next.js. Each product page lists its exact system requirements.
Yes. Every purchase comes with an invoice that shows VAT. Business customers can enter their VAT ID at checkout.
Yes, within 14 days of your purchase, as long as you haven't used the product yet, for example by accepting the repository invitation, downloading it or activating a licence key. After that, contact us about defects or other problems; your statutory rights always apply. Details are in our refund policy.
Write to support@zyloft.eu. We answer every message personally.
Write to support@zyloft.eu and tell us what you're interested in. We'll let you know personally when it's available.
08 / Contact
Whether it's about a product, a purchase or your data: write to us. We read every message and reply personally.
Write to usSupport
support@zyloft.euPrivacy & data requests
privacy@zyloft.euBased in
Germany
