The REIQ's 90 Day Ready Reckoner is a free Android app developed by The Real Estate Institute of Queensland Ltd. It is designed to aid Queensland real estate professionals in their day-to-day business. The app has two main features: the 90-day Ready Reckoner and the Commission Calculator.

The 90-day Ready Reckoner helps calculate the 90-day period for an exclusive or sole listing. This feature is particularly useful for real estate agents who need to keep track of their listings' expiration dates. The Commission Calculator feature enables users to calculate their commission based on the Queensland Government set fees or adjust it according to their agencies' requirements.

Overall, the REIQ's 90 Day Ready Reckoner app is a handy tool for Queensland real estate professionals. It is easy to use, free, and provides accurate calculations.