OpenTable is the largest platform by restaurant count and the most common one in San Francisco among the rooms we track. Its release behaviour is the least uniform of the four. Everything below is measured across the 34 OpenTable restaurants SnagRes watches, not taken from OpenTable's own documentation.
OpenTable’s waitlist works like Resy Notify: one restaurant and date at a time, OpenTable restaurants only. That is worth using and worth knowing the limits of: it covers one platform, so if the table you want is on one of the other three it does not apply at all. SnagRes watches all four. How the alert services compare.
10 of the 34 OpenTable restaurants we track do not yet have a confirmed release schedule, and we would rather leave those blank than assume one. Everything here describes hard-to-book restaurants in two cities, which is not the same as describing OpenTable as a whole. How we measure this.