A €35 ballistics calculator topped the Italian sports paid chart: the one selling it isn't the app, it's the author

The best-known figure in Italy's precision rifle scene, October, just stepped down as director of PRS Italy and that same month released his own ballistic solver app, a one-time purchase at €34.99. Two days after launch, it's ranked #1 in the Italian App Store sports paid chart. Worldwide it has only 6 ratings, no ads, nobody on X is talking about it, and no media has covered it. Below: how a few dozen sales were enough to hit #1, which parts others can copy, and which can't.

A teaser with 470 views

On 2026 23, Davide Pisenti posted a teaser video on his Facebook. The caption opens with "Precision shooting is complicated, but the moment you pull the trigger has to be simple" and ends with "Coming soon to the App Store". The video has 470 views and 16 reactions so far (Facebook, 11-06). His personal Instagram has about 1.3K followers, and the app's official account has 58 followers.

The Oct 29 PSS Field Kit went live. On Oct 31 it ranked #1 in the Italian sports paid chart and #35 overall. Over the next few days it moved between #1 and #3, and on 11-06 returned to #1 (App Store Italy). The same day it was also #1 on Croatia's sports paid chart, even though it had zero ratings there.

On launch day and Nov 1, 4 five-star Italian reviews appeared, one of which states the reason for buying directly: "Ho scaricato questa app perché sviluppata da una delle persone italiane più competenti in materia" (I downloaded this app because it was developed by one of the most knowledgeable people in Italy on the subject, 11-01).

What it is

A ballistic calculator for long-range precision shooting on iPhone/iPad. Enter the rifle, cartridge, scope, distance, wind, temperature and angle, and it computes the turret adjustment in mil or MOA (rounded to your turret clicks), accounting for wind drift, Coriolis and gyroscopic drift. Prepare your rifle data at home, and it still calculates at the range with no signal.

What sets it apart from similar apps are a few design choices borrowed from competition: a table holds up to 20 targets and sets the shooting order, matching a PRS stage with a string of targets at different distances; it can print a "rifle card" to stick on the stock so you can read it even with a dead phone; and it uses your actual observed shot placements to correct the ballistic model. The official pitch: "One-time purchase, no subscription, free updates" and "No account registration, no ads, your data stays on your phone." Italian and English only.

The author's background is laid out on the official homepage: director of PRS Italy from December 2023 to October 2026; Italian national rimfire champion 2022, 2023 and 2024; over a hundred podium finishes; has taught advanced sniper courses for army, navy, air force and carabinieri; wrote Italy's first PRS book; and took part in testing and validating a ballistics software used by law enforcement. Earlier he was a civil aviation captain and flight instructor. When he stepped down as director the site said he was "going on to new projects." This app is that new project.

Why a few dozen sales were enough to hit #1

Italy's sports paid chart is shallow to begin with. Few people buy paid apps, and even fewer buy sports apps, so ten or so €35 purchases a day can put you in the top three (estimate). Hitting #1 in Croatia with zero ratings also shows how little it takes to top these small-country charts.

Its performance in other countries backs this up: on Switzerland's sports paid chart it ranked between #2 and #24 (CHF 25), its best in Austria was #5 (11-02), then it dropped to #144; it only charted in the US store from 11-04, ranking between #115 and #199 (US$29.99) (App Store country charts, 11-06). Outside the Italian circle, it's just an ordinary paid tool.

Worldwide ratings total 6. Scaling by the usual review-to-sales ratio for paid apps, cumulative sales are probably a few hundred (estimate, unverified). At €35 each, that's revenue in the thousands to low tens of thousands of euros (estimate). Real money, but not big scale.

Where users come from

The author himself. PRS in Italy is an organized community with competitions, associations and courses. He's the person who runs the matches, wins the titles and teaches the classes; nearly every serious shooter knows him, has taken his course, or has seen him on the range.

His own social accounts. The 10-23 teaser, followed by posts like "Apple approved it," the launch, and feature breakdowns. The reach is small, but it's the right audience watching.

Limited-time pricing. The site states €34.99 until Nov 30, then €44.99. For an insider who already wanted it, that's a "buy now" prompt.

Books and courses. The official site links to his DLR Academy courses and the book "Il Tiro PRS" on Amazon. There's also a PRO version sold only to law enforcement units, requiring an agency email to apply, that comes bundled with his course. This track has nothing to do with store rankings, but it shows he treats the app as an extension of his courses and books.

The first 4 long reviews all read like recommendation letters and landed in the first three days after launch, which suggests students or people in the circle wrote them (an inference, not proof they were paid or faked; that's normal for a small-circle debut). I found zero ads, TikToks, press, or creator reviews.

Who it's competing with

Ballistic calculators are an old, crowded category, and most of the volume goes to free apps.

The most interesting one is the last. Victrix is an Italian rifle maker, and GVX is from its founder Giuseppe Valtorta, bundled with his online course. The pitch is offline, one-time purchase, no subscription. Pisenti was an early Victrix partner instructor and team member. Both apps were teased for weeks, so it doesn't look like one copied the other. It looks more like two of Italy's PRS factions each turned their reputation into a paid app at the same time (inference).

Also, this year a dozen-plus "XX Ballistics Calculator" apps have appeared on the US store. Most are free with a subscription and have single-digit ratings. The category isn't short on newcomers. What's missing is a reason to trust that the numbers are right.

Its weak spots

• It runs on the person, not the product. The ballistics engine (G1/G7 drag models, Coriolis, corrections) is standard, and the big free apps have it too. The edge is the competition workflow and the native language, which decides whether buyers are happy after purchase, not whether they show up.
• The circle has a ceiling. The core audience of Italian PRS and long-range shooters is small. After the first wave of insiders buys, it's unclear who's left to sell to.
• Goes to €44.99 after 11-30. Once the launch price ends, whether the ranking holds up won't be clear until December.
• No Android version. The site lists iPhone/iPad only; the competitor GVX is on Android too.

If it were you

Grade C. The lesson here is the playbook: inside a tight, organized hobby community, the most respected person ships a high-priced one-time-purchase pro tool and uses books, courses, and events to drive installs. Dozens to hundreds of core users can push it to the top of a small country's paid chart, and the money is real. But the lift came from Pisenti himself, which others can't copy. The product also faces a pile of free apps from big brands, so a random person building the same calculator would probably not sell.

Who it fits: you're already known in a narrow community (coach, champion, association organizer, author), or you're a developer who can split revenue with someone like that. The community needs three things: expensive gear (a €30 app is pocket change), recurring events like competitions or courses, and no mainstream tools in your language. Look at archery, hunting, sailing, model aviation, drones, diving, and private aviation.

Who it doesn't fit: anyone without standing in the community and no partner who has it; anyone aiming for mass market and planning to grow slowly with subscriptions; anyone planning to go head-on against Applied Ballistics and GeoBallistics in English.

How to do it: find the person first, then write code. Agree on revenue split with the authority figure. Take features from their courses and competitions: the questions students always ask and the math people always do by hand at matches become the v1 feature list. One-time purchase, offline, no accounts. This audience dislikes subscriptions and data collection. Also make an institutional version (clubs, schools, military/police) bundled with courses, to get deals outside the store.

How to get users: one to two weeks before launch, the authority posts a teaser on their own accounts. On launch day, post in course groups, association groups, and competition groups with a launch price that has a deadline. Demo live at matches and in classes. Early ratings coming from students is normal; ask them to write about real use cases.

Deadline: no window. This playbook isn't timing-driven. It depends on who you know.

How I'd be wrong: (1) after the December price increase it stays in the top 10 of Italy's Sports paid chart for months, or it ships on Android and charts in neighboring markets like Spain or France. That would mean the product sells on its own, not just on the author's name, and the grade can go up. (2) The reverse: if it drops out of the top 50 by December and ratings stall in single digits, this was a one-time cash-in from insiders, and it's an open question how long the playbook lasts.