Individual accounts for a single user cost 20 Australian dollars, payable in advance, and entitle the user to 1000 runs of the solver within a calendar year from receipt of the payment.

Under schedule B an account is pre-paid for a stated number of group members. For N users, where N is in the range 4..250, the cost is set at AUD (10 - N/50) per head. For fewer than 4 users, the usual minimum total price of AUD 30.00 applies. For more than 250 the minimum flat rate of AUD 5.00 per head applies.

Groups making heavy use of the site (e.g. classes of substantially more than 250 students, or groups using the site on a regular basis over several years) should contact us, as it may be possible to negotiate a reduced fee.