The company
Property on one side, software on the other
The registered company is A&A Kinnisvara OÜ, at Telliskivi tn 51a, 10611 Tallinn, and Aivar Villemson answers for what it publishes. Dev is the name the apps go out under.
The two halves share an address and nothing else. An app published here holds no listings, no client records, no viewings and no contact details, and has no means of reaching any — which the next paragraph makes rather more than a promise.
Built with nothing behind them
Whatever an app needs to remember goes into its own private folder on the phone, which Android keeps sealed off from everything else installed. No account is created, no identifier is issued, no event is counted and no advertising library is compiled in.
So there is no database here to lose, nothing to hand on, and an app that still opens years from now on a handset with the signal off.
Published by A&A Kinnisvara OÜ
Killuke
A shape-fitting puzzle
com.tahvel.killuke
A handful of geometric pieces and an empty silhouette to fill. Slide them, spin them, flip them, and work out how they nestle together inside the outline — gentle and obvious at first, then small geometry problems where every piece has exactly one place it belongs.
Pieces glow when they sit right, resist overlapping when they do not, and the board checks the result against real geometry, so a finished shape is genuinely finished rather than nearly. There is no timer and no failure state. Dozens of hand-built silhouettes run from easy to hard in themed sets of figures and abstract forms, with progress and best solutions kept, a hint that settles one piece when a shape locks up, an undo for free experiment, and a tray for arranging the pieces into whatever you like. English and Estonian, offline, no account, no advertising.
Killuke on Google PlayHow many ways does a shape go together?
Take the plainest version of the question — fill a rectangle with two-square pieces, and count the arrangements. It sounds like something you would have to search for, piece by piece, and for a long time that is exactly what people did. Then in 1961 Kasteleyn, and independently Temperley and Fisher, produced a closed formula: the number of ways to tile an m × n rectangle with dominoes is a product of cosines. Trigonometry, answering a question about shapes fitting into a box. The panel below counts the arrangements exactly, by walking the rectangle cell by cell, and the figure it lands on matches that formula to the last digit.
12,988,816ways the rectangle can be filled
64cells, which is
32pieces every time, never more or fewer
1.2917ways per cell, counting geometrically
1.33852what that tends to on an endless floor
3,604and this one is a perfect square, of this
Not on this bench: no silhouette, no pieces, nothing to drag and nothing solved. It will not tell you where anything goes. It counts how many ways a very simple shape could be filled, which is a different question from finding one — and far easier, which is itself the interesting part.