Fajero

Fajero is the on-site concrete mix companion built for builders, DIYers, and anyone who wants to get their mix right the first time. Dial in cement, sand, aggregate, and water using intuitive sliders, and Fajero instantly predicts 28-day compressive strength, slump, and workability — so you know exactly what your concrete will do before you pour a single drop. Choose from ten real-world batch targets — from garden paths and fence-post sets to structural columns and reinforced beams — each defined by its own strength and slump requirements. The lab engine applies Abrams' law to deliver a live strength estimate in MPa, a workability rating from stiff to sloppy, and a 28-day cure curve that shows how your mix develops strength over time. Instant feedback flags common problems such as segregation, a mix that is too wet, or one that falls below target strength before anything is committed to a pour. Save your winning recipes to the Recipe Book and pull them up on every future job. Fajero stores everything locally on your device — no account required, no cloud sync, no data fees — so it works just as well underground or in a dead-signal area as it does on a sunny build site. Whether you are laying a garden path or designing a load-bearing slab, Fajero gives you the numbers you need to mix and pour with confidence.