Android app · in development, v0.2
An Android app that applies one trend and breakout method to stocks and tells you, rule by rule, whether each one is a buy today, one to watch, or a no.
Status: in development, v0.2, Android.
Web demo. These are the Android app's screens, recreated for the browser. The verdicts come from the app's engine, which I ported line by line from Kotlin to JavaScript. The companies, prices and indices are invented, generated from fixed seeds.
Spanish interface, as in the app. Tap anything. Datos simulados
Charts by TradingView
The method
methodology v2
The method combines a trend template, the classic base patterns (cup with handle, Darvas box, flags) and a breakout volume rule the app calls PAVA. Structural filters reject a stock outright. Temporary blocks only hold it on watch. A score from 0 to 100 decides the rest, using closed daily bars only.
| Rule | What it checks | If it fails |
|---|---|---|
| H1 Data | At least 260 closed sessions, no gaps, volume present | RECHAZADO |
| H2 Liquidity | Price of at least $5 or 2 EUR; 50-day traded value of at least $10M or 2M EUR | RECHAZADO |
| H3 Trend template | TT1-TT7: price over the 50, 150 and 200-day averages, averages stacked, the 200-day rising for a month, 30 % or more above the 52-week low, within 25 % of the high | RECHAZADO |
| H4 Relative strength | RS rating of 80 or more: percentile of the 12-month return weighted 40/20/20/20 | RECHAZADO |
| H5 Pattern | Darvas box, cup with handle, high tight flag or bull flag, pivot within 10 % of the 52-week high | RECHAZADO |
| H6 Pivot | Close in the buy range (pivot to +5 %) and not stretched from the 50-day average; inside the base is a no | RECHAZADO (within 5 % below: watch) |
| B1 PAVA | Close above the pivot on at least 1.4 times the 50-day volume, in the upper half of the day's range, confirmed within 5 sessions | VIGILANCIA |
| B2 RS leader | RS of 90 or more | VIGILANCIA |
| B3 Market regime | Correction or rally attempt: no new buys. Under pressure: only RS 95 or more | VIGILANCIA |
| B4 Earnings | No new buys in the 10 sessions before a report | VIGILANCIA |
| B5 Simple flag | A bull flag needs a strong breakout (2 times the volume) | VIGILANCIA |
| S Score | RS and RS line 25, pattern 20, volume 20, overhead supply 15, trend 10, fundamentals 10 (rescaled when absent) | 70+: APROBADO · 50-69: watch · under 50: no |
| V1-V8 Selling | Initial stop at the base low or 8 % at most, breakeven at +15 %, 10-week average and SMA20 exits, half off at +20 % (later for fast leaders), climax and bearish-pattern warnings | Sell at the next open |
How it's built
Kotlin · four modules
pure Kotlin/JVM · 263 tests
Indicators, the trend template, RS, the bases, PAVA, overhead supply, the regime state machine, score, verdict, stops, sizing, the paper portfolio's sell rules, the backtest, the heat map layout. It has no Android imports, so it runs and is tested on the JVM.
pure Kotlin/JVM · 67 tests
Data sources behind one interface, the symbol catalog, the nightly scan service, the cache refresh, SEC EDGAR's filings and the macro panel's sources.
pure Kotlin/JVM
The course: 85 lessons in Markdown, links from lessons into the app, progress, tests and card review.
Android · Compose
Jetpack Compose with Material 3 and fixed brand colours, Room (schema v7) for the cache, lists, alerts and the paper portfolio, WorkManager for the nightly scan, manual dependency injection instead of Hilt, and Lightweight Charts in a WebView.
Daily bars from Yahoo's chart endpoint by default; US companies' filings and earnings dates from SEC EDGAR; macro figures from the ECB, the BLS, the US Treasury and the New York Fed. None of it needs a key or a subscription.
engine.js reproduces the Analyzer (H1-H6, B1-B5, score, plan), the four bases, PAVA with its weekly variant, overhead supply, the RS line, the regime state machine, the "what is missing" texts, the automatic lists, sizing and the squarified treemap. The tests in site/tests/la-pina.test.mjs run the Kotlin fixtures and get the same verdicts. The price series come from a bit-for-bit port of java.util.Random, the generator the app's screenshot tool uses.
Left out: gold, silver and bitcoin's adapted rules, the chart-pattern detector (flat bases from ranges and the B7 bearish-pattern block), the fundamentals layer, trading costs and the full backtest. Those stay in the app.