TandemIQ: Axle Weight Calc
Tandem slide & scale weights
About
This app quickly calculates optimal tandem axle positions and weights for trucks, ensuring legal loads. It offers features for federal legality checks, trailer and fifth-wheel slides, and saved trailer profiles. The app works offline and provides clear, actionable instructions.
What's New in TandemIQ
1.0.1
September 24, 2026
The one-time purchase is now called Scale House, named for what it actually unlocks: fifth-wheel slide, bridge formula check, saved trailer profiles, and the scale ticket log. Same purchase, same price — if you already own it, nothing changes.
MoreSubscriptions & In-App Purchases
$4.99
Scale House
Fifth wheel, bridge check, trailers, ticket log.
Developer apps
FAQ
What are the core features of TandemIQ?
TandemIQ offers a free federal axle and gross legality check, along with trailer tandem slide solutions. The full unlock provides fifth-wheel slide calculations, Federal Bridge Formula checks, saved trailer profiles, calibration, and a scale ticket log with photos.
How does TandemIQ help with sliding tandems?
TandemIQ provides unmistakable direction on how to slide tandems, specifying the number of holes and the resulting weight on each axle. It correctly advises whether to move tandems forward or backward to shift weight appropriately.
What happens if sliding tandems won't legalize the load?
If a load is over gross weight and cannot be legalized by sliding, TandemIQ will clearly state 'CANNOT BE LEGALIZED BY SLIDING' and explain why, preventing users from making incorrect adjustments.
Does TandemIQ require an internet connection?
No, TandemIQ works perfectly without any signal. It has no network code, meaning it functions identically in airplane mode, dead zones, or remote locations.
What is the cost of TandemIQ?
The app is free to download and use for basic federal legality checks and trailer tandem slide solutions. A one-time purchase of $4.99 unlocks advanced features like fifth-wheel slides, Federal Bridge Formula checks, and saved trailer profiles.
Does TandemIQ have ads?
No, TandemIQ is ad-free. The description explicitly states 'No ads — not now, not ever, including for people who paid.'
What is the update frequency for TandemIQ?
The app was last updated on September 24, 2026, indicating active development. Users can expect ongoing support and potential feature enhancements.
Is TandemIQ available on Android devices?
Based on the provided data, TandemIQ is currently only supported on iPhone devices. Information regarding Android availability is not specified.
