Counted across every app we ship
The counter has one working digit. It has never needed another.
Native iOS tools that do exactly what they promise, and deliberately nothing more.
Every feature earns its place through deliberate consideration, and many ideas are left out. No onboarding mazes. No upsell popups every three days. LeanTools are quiet apps that stay out of your way so you can focus on what actually matters. We think “what can we remove?” before we ask “what can we add?”
100% iCloud infrastructure. No third-party analytics SDKs, no mystery telemetry, no account required. Your data belongs to you: it lives in your ecosystem, on your device, under your control. We imposed this constraint on ourselves from day one, and we have held to it ever since.
Built from scratch in SwiftUI for iPhone and iPad. Fast, fluid animations. Dynamic Type, dark mode, system integrations that just work. Not a cross-platform wrapper dressed up to look native: the real thing. Because your hardware deserves software that was built for it.
The lean task manager for iPhone and iPad.
Priorities, due dates, notes, and iCloud sharing: everything a focused workflow needs and nothing it doesn't. Organize work across multiple lists, share them with family or your team, and assign tasks to collaborators. No account required, no third-party cloud. Free to start, with LeanTask Plus as an optional upgrade for those who want more.
Your personal book library, always with you.
Catalogue your home library, track lending in both directions, and share your collection with your household: all via iCloud, no account required. Add books by ISBN scan or title search, manage a wishlist, and organise by author and shelf. Built on the same lean principles as LeanTask.
Invoicing without the accounting baggage.
The invoicing app for German small businesses filing under §19 UStG. Enter an invoice, generate a PDF carrying every field §14 UStG requires, and send it straight from the app. Track working hours and turn them into line items with one tap. Sent invoices are read-only and changes are recorded. German-language app, released on the German App Store.
What the car actually costs.
Fuel, servicing, and consumption in one place, so the running cost of a car stops being a guess. Built on the same constraints as the rest: your records stay on your device and in your own iCloud. One car free, more with LeanCarCost Pro.
developer who builds them
Jochen Köneke
Every LeanTools app is designed, written, and supported by one developer in Sülzetal, Germany. That is the whole company. Your data stays exactly where you put it — on your device and in your own iCloud. There is no server for it to sit on, and no one here who could sell it.