FX Lot Size Calculator: FleX
Position Size & Forex Trading
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Stop fumbling with web calculators while trading. FleX puts accurate Lot Size Calculations right on your phone. Size your Forex & Gold Positions correctly in seconds.
# Features
• Quick Pair Selection
• Broker Independent
• Leverage Independent
• Real-Time Market Data
• Account Data saved for reuse
# Pricing
FleX is premium and ad-free.
A subscription is required to use the app.
We offer a 7-day free trial so you can test all features.
• Annual Plan - $9.99 / year
• Weekly Plan - $2.99 / week
• Lifetime Plan - $24.99 once
Prices shown are for US customers and may vary by region.
Payment charged to Apple Account at confirmation of purchase.
Subscription automatically renews unless canceled at least 24 hours before the end of the current period.
Manage Subscriptions in App Settings.
# Legal
Terms of Use:
https://lotsize.app/terms-of-use.pdf
Privacy Policy:
https://lotsize.app/privacy-policy.pdf
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Thank you for using FleX!
The developer, Christoph Stadelbauer, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Christoph Stadelbauer
- Size
- 16.2 MB
- Category
- Finance
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- FleX Premium $9.99
- FleX Premium $2.99
- FleX Premium Lifetime $24.99
- Copyright
- © 2026 Christoph Stadelbauer