Why online Viewer?
If you've got urgent email with attached MPP document but has no MS Project installed... Or if you've just created amazing plan for prospective client but not sure if he has Planner installed... Or you're going to organize conference call with 10 software developers distributed over the globe ... Anyway with Ganttzilla you can view or share your Gantt charts with anyone using just web browser!
And another interesting Ganttzilla feature: you can use our service as versioning storage and discussion boards for your project documents.
Why online Editor?
Now you can not only browse your project plans but also edit them! You can create brand new plan from scratch and fill it with tasks, resources, relations ... Or you can select some existing document or version and add new tasks or people to the plan. You can track plan evolution through versions. You can rollback to any version and edit it.
With this feature you've got complete substitution for desktop tools like Microsoft Project orGnome Planner.