Forgeplot is now on Mac, and one purchase covers iPad, iPhone and Mac. Also fixed: saved photo pieces no longer reopen upside down. Pieces you already saved correct themselves.

Now designed for iPhone Duo. Closed, Forgeplot works like it does on iPhone. Open it flat and you get the full studio: art on the left, controls on the right, with Apple Pencil (USB-C) support. Half-fold it and the art fills the top half while the controls sit below, so you can tweak sliders and watch the piece redraw live. Your piece, scroll position and open sheets stay put as you fold and unfold. Wallpaper export has two new exact-pixel targets, iPhone Duo (outer) and iPhone Duo (inner), recomposed for each screen rather than cropped.

New: Keepsakes, a family of drawings made as gifts. Star Chart draws the sky over one of 20 cities, or any latitude and longitude, on a date and local hour you choose, with the stars, constellation lines and names. Moon Calendar draws a year or a month of moon phases, with the dark side hatched. Text Art sets your own words in single-stroke lettering on a line, circle, spiral or wave. New generators: Weave, Swept Circles (up to twelve weaving tubes, each in its own pen if you like, in flat or turnable 3D), Recursive Cells (inside a page, circle or letter), Isometric City, Perspective Lawn, Perspective Blocks, Hex Mosaic, Tree Rings and Distance Grid. Circle Packing can now fill each circle with a spiral, and Voronoi accepts up to 4000 points. Fractals: a new family of eight: Dragon Curve, Koch Snowflake, Sierpinski, Mandelbrot & Julia, Penrose Tiling, Barnsley Fern, Pythagoras Tree and Fractal Tree. Math & Physics: seven generators built on classic mathematics: Ulam Spiral, Multiplication Grid, Apollonian Gasket, Newton Basins, Wormhole, Radiating Dipole and Hopf Fibration. Legends: add a single-stroke title block to any piece, with the title, seed, your settings, an edition number and your signature. Put it in the margin, shrink the art to fit, or overlay it. Full page is still the default. More colours: Colour By can split a drawing into as many colours as you have pens, up to nine, with a new Colours control. The Pens section shows which layer plots with which pen. There is a new Nine Inks pen set. Also: controls that don't apply in the current mode are greyed out, with a line saying what to change. De Jong attractors can be drawn with dashes, the legend's text-size slider explains when the margin limits it, and long option lists now show as a menu. 60 generators in all.