I don't think there is a limit to Zapier's scalability. I would rate it a ten out of ten. 

Stability-wise, I rate the solution a six out of ten owing to the bugs and breakdowns of the system that I have experienced. One cannot understand how Zaps work unless you test it out a few times.

I would rate it around nine. It's very stable.

My impression is that it's a stable solution.

I would rate the stability an eight out of ten. There is room for improvement. 

I rate Zapier an eight out of ten for stability. For the most part, Zapier is stable. However, it has downtime like any other cloud-based software.

Zapier is stable. If I even had an issue, it is fixed within one day.

Zapier is a very stable solution, but the problem with it is if your credit card lacks funds, the Zapier team will downgrade your subscription, which impacts your service's stability. I've faced this situation before, and I remember how a lot of data was misplaced, and I had to recover the data, which took a very long time manually.

I tried to make a recovery by batch, but because the license was downgraded, it impacted the number of data. For example, on the free version, you can have up to five hundred data; imagine if you've done thirty thousand data. If your card payment doesn't go through during renewal, Zapier will downgrade your data to five hundred, and the service will stop completely.

It is a stable platform. However, when automation fails, they could provide information about the reasons for failure. We have run automated tests again in debug mode with the same data. I rate the stability a seven out of ten.

I rate the platform’s stability a nine out of ten.

I have found it to be very reliable for the things I have done. As an IT project manager, I use Zapier for many use cases with all of my clients.

There were no such stability issues. It works great and warns us if there is any situation that requires our attention/action. For example, if many actions are triggered suddenly.

A few times our zaps would get turned off.

The stability is great. There are no bugs or glitches. it's reliable. It doesn't crash or freeze. 

Zapier is very stable.

We have not had stability problems.

We have not had stability issues.

We did see a few issues over a period of time with the Amazon failure where Zaps didn't fire, but that may have been on the trigger side of each event.

Not all Zaps work perfectly the first time. However, most of the time it is the third-party application that is producing the errors. Some Zaps with custom fields are not easy to integrate on the first try.

I did not encounter any stability issues.

This is a stable solution. 

Once or twice the API did not connected and we weren't sure if it was an error in our Zap setup, Zapier servers, or in the external API.

Very rarely do we have stability issues. Occasionally, there are instances where it seems like actions that should have triggered a Zap did not trigger it. But it's hard to say whether it's Zapier's fault, or the fault of the tool generating the trigger.

We encountered a stability issues once when Zapier upgraded the Google Sheets backend. However, this was most likely an error on my part and not Zapier.

I haven’t experienced major stability problems. There were a few instances when a trigger-action did not fire or there was a delay. During these instances, however, I would just retest the step and it was fine.

Until now, we have had no stability issues.

It's a very stable product. The logging is comprehensive and it also has reliable logging applications for all the different states of everything that is logged, which is excellent for troubleshooting issues.

Occasionally, we did have stability issues. Sometimes an error is reported, such as a connectivity problem between systems.

We have not had stability issues so far.

I haven't encountered any stability issues.

There were no stability issues.

There were not stability issues.

We did have stability issues, at one point every week. This was 3 years ago.

We only had a a stability issue once where Zapier had downtime. Other than that, it’s been working fine.