# R-MAP Keystone — See which risks own the tail > Risk analysis tool re-ranking by worst-year impact and correlation. (iPhone/iPad app by Francisco Mavungo.) - Source: https://appshunter.io/ios/app/r-map-keystone/id6801757735 (this page in markdown: same URL + `.md`) - Developer: [Francisco Mavungo](https://appshunter.io/developer/1885212034) - Category: Business, Productivity - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 2 MB - Languages: American English - Released: 2026-08-20 - Data updated: 2026-09-04 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/r-map-keystone/id6801757735/reviews.md ## What is R? Every risk register on earth ranks by likelihood times consequence. That ranking answers which risk is biggest on average. Nobody funds mitigation for the average - they fund it for the year that hurts. KEYSTONE re-ranks your risks by their share of the worst years, and the two rankings routinely disagree. THE REGISTER State each risk as a three-point range: how often it happens, how bad it is when it does. Minimum, most likely, maximum - the range you actually believe. KEYSTONE turns your ranges into distributions; you never have to name one. THE MATRIX Risks do not fail politely, one at a time. Set how strongly each pair moves together with a tap. Correlation is what the tail is made of, and it is the input almost every simple tool ignores. THE RANK FLIP KEYSTONE samples your whole portfolio tens of thousands of times through the correlation matrix, then allocates the tail back to the individual risks by the Euler principle - each risk's exact share of the worst years, summing to the portfolio total. The result is two rankings side by side: the register's order and the tail's order, with an arrow on every risk they disagree about. A risk sitting seventh on your register and first in the tail is the finding this app exists for. THE CLIFF Drag one slider and watch every correlation converge toward 1 - a crisis, when everything moves together. The distance between the left edge and the right edge is your diversification, and it is the first thing a real crisis takes away. KEYSTONE tells you the crisis premium still ahead of you. HONEST ABOUT ERROR The tail is an estimate. KEYSTONE bootstraps an error band onto its own numbers and prints it next to them. Auto re-sample re-runs the simulation continuously with a stepping seed so you can watch the estimates breathe - that wobble is sampling error made visible, and no number here pretends to more precision than it has. REPRODUCIBLE BY SEED Every run is driven by a printed seed. Quote it in the shareable report and anyone with KEYSTONE and your register reproduces every number exactly. Risk numbers you can audit. CALIBRATION People state ranges that are too narrow. The calibration correction widens every severity range by a factor you control - and if you track your own forecasting record in R-MAP Caliber, free on the App Store, you can use your measured overconfidence as that factor. FREE AND FULL Free: the complete worked example portfolio - eight risks, correlations preset, every screen live - plus up to five risks of your own. One purchase unlocks unlimited risks and correlation editing. No subscription. PRIVATE BY DESIGN Everything stays on your device. No account, no sign-in, no analytics, no tracking. The only network activity is the App Store purchase itself, handled by Apple. Built by R-MAP LLC. ## Key features - Risk re-ranking by worst-year impact - Three-point risk range input - Correlation matrix visualization - Crisis scenario simulation - Error band and sampling error visibility - Reproducible results via seed - Calibration correction ## Frequently asked questions about R ### What is R-MAP Keystone's primary function? R-MAP Keystone re-ranks risks based on their share of the worst years, rather than just average likelihood and consequence. This provides a different perspective on which risks truly matter during extreme events. ### How does R-MAP Keystone handle risk input? You input each risk as a three-point range: minimum, most likely, and maximum. The app then turns these ranges into distributions, allowing for more flexible modeling without needing to specify a single probability. ### Can R-MAP Keystone simulate crisis scenarios? Yes, you can drag a slider to converge correlations towards 1, simulating a crisis where everything moves together. The app then shows your diversification and the 'crisis premium' still ahead. ### Is R-MAP Keystone accurate and trustworthy? The app provides an error band and visualizes sampling error to be honest about its estimates. Each run is driven by a printed seed, making results reproducible and auditable. ### Does R-MAP Keystone have ads? No, R-MAP Keystone does not contain advertisements. Its monetization is based on a one-time purchase to unlock unlimited risks and correlation editing, with a free tier available. ### What platforms does R-MAP Keystone support? R-MAP Keystone is available for iPhone and iPad devices, as indicated by its compatibility with iOS. ### How often is R-MAP Keystone updated? The app was last updated on August 27, 2026, with version 1.0.1. This suggests a recent update, though future frequency is not specified. ### What is the age rating for R-MAP Keystone? R-MAP Keystone has an age rating of 4+, making it suitable for a wide audience, though its business focus suggests it's primarily for adults. ## Version history (last 2 releases) ### 1.0.1 — 2026-08-27 A new Ledger tab keeps every run — see your tail move as the register changes, and which change moved it. Set correlation by category instead of cell by cell. Value at risk now shows its confidence band, and the tail tolerance you choose drives every figure and export. ### 1.0 — 2026-08-21 No release notes. ## More apps by Francisco Mavungo - [FM Alerts](https://appshunter.io/ios/app/fm-alerts/id6760596758) - [R-MAP Caliber](https://appshunter.io/ios/app/r-map-caliber/id6798137560) - [R-MAP Ideon](https://appshunter.io/ios/app/r-map-ideon/id6798545683) - [R-MAP Crux](https://appshunter.io/ios/app/r-map-crux/id6801779659) - [R-MAP Aegis](https://appshunter.io/ios/app/r-map-aegis/id6801780003) All apps by Francisco Mavungo: https://appshunter.io/developer/1885212034 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-04.*