The proposal was unveiled in the Capitol on Thursday by organizations representing school boards, administrators and districts.
The "Classrooms and Kids" budget would put more money into the traditional per-pupil foundation grant by taking it from some "categorical" funding that rewards districts for best practices and performance.
Snyder has proposed giving schools $83 to $111 more per student. The alternative proposal would provide between $250 and $291 more.
Supporters say the alternative would simply the budget.
A Snyder spokeswoman said he's pleased to see groups offer ideas, but thinks best practices and helping struggling schools are important.