Monthly Rule
Finance
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
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Monthly Rule is now on Android as well. This update brings the iPhone app in line with that release:
- The fund picker no longer leaves a gap beneath it.
- The app now keeps its dark appearance throughout, including the keyboard.
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
- 25.4 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
