Rule-based stock scoring
Build your own rule set and apply it to the entire stock universe. StockScorer does not tell you what to buy; it shows every number down to the individual rule.
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Conditions on fundamental metrics, absolute or relative to the sector, with their own weight and their own thresholds. The editor recalculates in the browser: move a threshold, see immediately who is left.
Return on equity (ROE) · ≥ 20 %
How much profit a company gets out of the equity it employs. 20 percent is a hard threshold, it filters out the large majority of the universe. If you want a softer filter, set 12 and give the rule more weight instead.
70of 503
That is how many stocks in the S&P 500 meet all four rules on this day. Change one threshold and the number changes with it right away.
Without an index filter, the same rule set runs across all 16,265 scored stocks.
No rule set of your own?
The beginner's path: look up a stock, try a ready-made rule set on the Dow Jones, both without an account.
No ranking without a derivation. Below is a real evaluation from the “StockScorer Score” rule set: which rule contributed how much, where the stock stands across the six categories and how the score moved over 90 days.
Every point hangs on a condition that you set yourself.
Six categories show where the strength comes from, not just how high it turns out.
90 days of history, including the days when things looked worse.
4 more rules in this rule set
See them with a free accountTotal10.0 / 11
No buy tips.
No trading signals.
No model portfolios.
No guru portfolio to copy.
We are not a broker, we manage no money and we execute no orders. The long version is on “What StockScorer is not”.
Top N, rebalancing, tolerance band, initial capital, benchmark: up to 15 years of history. Below, the StockScorer Score, top 10, quarterly, 10 years (Q2 2016 to Q2 2026), against the MSCI World.
| Metric | Strategy | MSCI World |
|---|---|---|
| Total return | +280.8 % | +240.1 % |
| Return p.a. | +14.3 % | +13.0 % |
| Largest setback | -20.2 % | -19.4 % |
| Sharpe ratio | 0.89 | 0.91 |
Volatility of the strategy: 16.2 %
41 periods, quarterly · Q2 2016 to Q2 2026
This backtest is an example. It gets interesting with your rule set, your period and your benchmark.
Run your own backtestBacktests run inside an account. Seven days of full access, no credit card.
Well-known strategies, rebuilt as rule sets and documented, from Piotroski to Levermann. Copy, adjust, recalculate. Match counts from the run of 09/30/2026.
Every stock measured against its own sector: return on capital, return on equity, cash flow margin and cash flow yield have to sit above the sector median, plus growth and market confirmation. 8 rules, 11 points at most. It is the starting point if you have not set your own criteria yet.
The 13 criteria across quality, valuation and momentum, rebuilt as a rule set. Each criterion counts one point, one minus point or nothing at all.
Durably high returns on capital, defended gross margins, balance sheet discipline. What that costs is deliberately not part of this rule set.
Clone it, change the thresholds, recalculate. After that the rule set is yours.
No commission for referred brokerage accounts, no paid placements, no advertising between your numbers.
We only earn if the tool is worth something to you.
The metrics come from an external provider. We check them for plausibility, but we do not collect them ourselves. Where a value is missing, it says so instead of being hidden.
One run, fanned out. The left column stands out: the majority of the universe meets almost no rule of a strict rule set.
Red = few rules met, green = many. Number per cell = stocks in that sector and band.
| Sector | < 4 | 4–5 | 5–6 | 6–7 | ≥ 7 |
|---|---|---|---|---|---|
| Basic Materials | 642 | 148 | 514 | 8 | 327 |
| Communication Services | 252 | 68 | 268 | 7 | 196 |
| Consumer Cyclical | 752 | 157 | 427 | 18 | 487 |
| Consumer Defensive | 311 | 121 | 218 | 11 | 266 |
| Energy | 176 | 76 | 141 | 7 | 164 |
| Financial Services | 625 | 132 | 658 | 25 | 607 |
| Healthcare | 715 | 88 | 871 | 14 | 282 |
| Industrials | 1,217 | 268 | 659 | 23 | 627 |
| Other | 55 | 22 | 1 | 5 | |
| Real Estate | 270 | 149 | 209 | 7 | 255 |
| Technology | 1,152 | 139 | 620 | 16 | 273 |
| Utilities | 194 | 41 | 118 | 1 | 93 |
No, and not as a cautionary formula but because the product is built that way. The score says exactly one thing: how many of the rules you set yourself a stock meets. That is why the levels are called high, medium and low match.
Yes. 18 documented rule sets are ready as templates, from Piotroski through Levermann to Rule of 40. Clone one, move a threshold, let it recalculate. After two rounds you usually notice for yourself which rule matters to you.
The step-by-step path for beginners: To the beginners page
From leeway.tech. A nightly run synchronises the universe, updates the metrics, computes sector averages and then recalculates every rule set. We check the data for plausibility, but we do not collect it ourselves and do not guarantee that it is correct.
More honest than comfortable. Point-in-time index composition only exists from July 2026 onwards, sector-relative rules use today's sector assignment, and if not enough candidates sit above the threshold, the remainder stays in cash. Each of these limitations sits in the result, not in the small print.
Seven days of full access, after that free access continues: screener, scores, library and the games stay usable, with quotas on rule sets, watchlists and backtests. Premium from 14.99 euros a month, cancellable monthly, no credit card to get started.
Only if you share it. Rule sets, backtests and individual views have optional short links so that somebody without an account can follow what you built. Without sharing, everything stays in your account.
Seven days of full access, free to keep using afterwards. No credit card, no lock-in, no investment advice.
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