Monthly Rule
Finance
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
One decision a month, taken from published rules rather than a hunch. Monthly Rule shows what each of six strategies holds now, computed from live market prices.
Monthly Rule lets you learn about and explore six tactical asset allocation strategies, each grounded in published research by Wouter Keller and co-authors.
Six research-based dual momentum strategies:
• VAA — Vigilant Asset Allocation (Keller & Keuning, 2017)
• DAA — Defensive Asset Allocation (Keller & Keuning, 2018)
• PAA — Protective Asset Allocation (Keller & van Putten, 2016)
• HAA — Hybrid Asset Allocation (Keller & Keuning, 2023)
• BAA — Bold Asset Allocation (Keller, 2022)
• LAA — Lethargic Asset Allocation (Keller, 2019)
Choose the strategies you follow and they appear as cards on the home screen, each showing which ETFs its rule holds this month and when that decision was set. There is nothing to enter — the month's decision is computed from live market prices each time you open the app.
Open a card for the full allocation, the reason the rule went offensive or defensive, and a preview of what the next month-end rebalance would say on today's prices.
For UK investors, switching region in Settings maps every asset class to an LSE-listed UCITS ETF, since the tickers in the original papers are not practically available from a UK broker. You can substitute your own tickers for any asset class.
No account, no ads, nothing to buy. Links to the original research papers for each strategy are available at monthlyrule.com.
Disclaimer: This app is provided for educational and informational purposes only. It does not provide financial, investment, or trading advice, and its signals are not recommendations to buy or sell any security. All investment decisions — and any resulting outcomes — are solely your own responsibility. Past performance is not indicative of future results. Always do your own research and consult a qualified financial adviser before investing.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Monthly Rule — that's the app's new name, and monthlyrule.com is its new home. Nothing about the strategies has changed.
The home screen now says what the app is for: one decision a month, taken from the published rules, with each card showing what that rule says to hold.
Clearer signposting throughout. The link to your settings and the link out to the website no longer look identical, and the US ticker list now offers to show you what it holds rather than to edit a list that is fixed.
The developer, ECOMCRAFT LTD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ECOMCRAFT LTD
- Size
- 25.3 MB
- Category
- Finance
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 ecomcraft
