Free42 vs SimpleLawn

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer. It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2. All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

SimpleLawn helps homeowners measure, map, calculate, and track their lawn care. Map your yard, split it into zones, calculate how much product you need, and keep a simple history of every treatment you apply. Built for beginner and intermediate lawn care enthusiasts, SimpleLawn helps you stay organized without making lawn care more complicated than it needs to be. MAP AND MEASURE YOUR LAWN Create lawn zones for your front yard, back yard, side yard, or any other area you want to manage separately. SimpleLawn helps you measure lawn square footage so you can plan fertilizer, grass seed, weed control, and other treatments with less guessing. CALCULATE LAWN TREATMENTS Use your lawn size to plan how much product each area needs. Whether you are fertilizing, overseeding, applying pre-emergent, treating weeds, or planning seasonal lawn care, SimpleLawn helps make the math easier. LOG WHAT YOU APPLY Keep a clear record of your lawn treatments. Track fertilizer, weed control, pre-emergent, insect control, fungicide, grass seed, and other lawn products. Know what you applied, where you applied it, and when it was done. STAY ORGANIZED BY ZONE Each lawn zone has its own size, details, and treatment history. That makes it easier to manage problem areas, compare results, and build a better lawn care routine over time. FEATURES - Lawn mapping and zone creation - Lawn square footage measurement - Treatment calculations based on lawn size - Lawn care log for fertilizer, weed control, pre-emergent, seed, and more - Separate treatment history for each lawn zone - Support for multiple lawns and zones - Dark mode support - Email sign in and Sign in with Apple SimpleLawn is free to get started. Map your lawn, calculate your treatments, and start building a lawn care history you can actually use.