Saher has been building crop-spraying equipment for decades. We turned that engineering know-how into an app that calibrates their sprayers and mist blowers on the spot, keeps the field logbook, and works where there’s no signal.
Saher has spent decades manufacturing sprayers, atomizers and mist blowers in Olèrdola, Barcelona. Calibrating them correctly used to mean tables, manuals and calls to support. We built the app that runs those calculations instantly for technicians and growers — and digitises the field logbook the regulations require along the way.
The challenge
A bad calibration ruins the whole treatment. Out in the field that calibration was done with printed tables, mental arithmetic and no signal — and a single misplaced decimal means too much product, a damaged crop, or a pass that has to be repeated.
Total flow rate, flow per nozzle and working pressure were all pulled from tables and a calculator. Any solution that depended on the internet would die in the middle of a plot, so the app had to calculate, store and look up everything on the device, with no network at all.
On top of that, the phytosanitary treatment logbook is a legal requirement — and it was still kept on paper. It had to be recorded where the work actually happens: sitting on the tractor.
Our approach
Manufacturer apps tend to be brochures with a logo on them. We set out to build the opposite: a working tool that calculates the exact calibration for each piece of equipment, remembers every configuration and logs every treatment — a technician you carry in your pocket rather than a catalogue.
We built it on a single Flutter codebase that ships to both stores, with Supabase behind it, and designed it offline-first from the ground up. The calculations, the saved-setup library and the field logbook all run entirely on the device, because the app gets used exactly where the tractor is: in the middle of the plot.
We worked directly with Saher’s technical knowledge so the inputs match the catalogue and the way the work is actually done — fields you can complete with gloves on, the right nozzle layout shown on screen, and results a grower can trust without second-guessing the maths.
What we built
Instant calibration
Enter the working parameters and get total flow rate, flow per nozzle and recommended pressure straight away. No tables, no calculator, no room for a stray decimal.
Nozzle layout, made clear
Identical or mixed, the app shows the correct orientation for every nozzle on the equipment. What used to be accumulated experience is now on screen.
100% offline
Every calculation lives on the device. The most remote plot gets the same pocket technician as the office, with or without signal.
Configuration library
Save each calibration by plot, crop or season and reuse it next time. The team’s knowledge stops evaporating between campaigns.
PDF reports and shareable links
Generate the calibration report as a PDF or share it with a link, so the technician, the grower and the distributor are all looking at the same numbers.
Digital field logbook
Record and manage phytosanitary treatments with a visual calendar and Excel export. The regulatory obligation, handled where the work happens.
The results
A traditional sector now has a real digital tool. From cereals to vineyards, seven crop types are covered in a single app, published on both the App Store and Google Play from one Flutter codebase.
Calibrations, the saved-setup library and the field logbook all work with zero signal, so the app is just as useful on the furthest plot as it is in the office. Growers and technicians complete a calibration in four steps, up on the tractor, in minutes.
The app is in production and rated 5 stars by its users — and the feedback talks about a partner, not a vendor.
“Very happy with the Docastix team — attentive and resourceful. Whenever we’ve needed them they were there for us; more than a vendor, they’ve become a partner. Highly recommended.”