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Force.com Canvas Limits

Because Force.com Canvas runs in a multitenant environment, limits are enforced to ensure protection of shared resources.
Description Limit
Number of canvas apps per user that can be displayed on the Chatter tab. Only the first 50 canvas apps are displayed (sorted alphabetically). 50
Number of Force.com Canvas calls per day per user (24–hour period) 5,000

This includes SDK calls to get context and signed request calls. Note that when you call a SignedRequest method, there are actually two calls that are made—one call for the method and one call for internal logging.

Heroku Quick Start calls per day per user 100

Heroku accounts have their own limits on the number of calls you can make.