---
title: "What are the resource limits of a Catalyst AppSail service, and which of them can be raised?"
url: https://docs.catalyst.zoho.com/en/faq/serverless/appsail-resource-limits/
description: "Each Catalyst AppSail service has these limits: memory of 128, 256, 512, 1024 or 2048 MB (512 MB by default), a disk size of 256 MB by default, 100 concurrent …"
last_updated: 2026-11-13T05:00:22Z
service: Serverless
type: faq
---

Each Catalyst AppSail service has these limits: memory of 128, 256, 512, 1024 or 2048 MB (512 MB by default), a disk size of 256 MB by default, 100 concurrent requests per instance with a new instance started at 80, at most 5 instances, 30 seconds to complete each request, and 10 seconds for your app to start listening on its port. Inactive instances are scaled down after 5 minutes of uptime, and a project can have 5 AppSail services.

You can change memory and disk size yourself: open the service in the Catalyst console, go to **Configuration** → **App Execution Settings**, click **Edit**, select the values and click **Save**. If a deployment fails with 'No space left on device', your app or container image doesn't fit the disk size, so raise it there.

The instance count, the concurrent requests per instance and the 5-minute instance uptime can be increased case by case. Contact Catalyst support with your requirements.

Note: AppSail offers no memory above 2048 MB and no GPUs; move work longer than 30 seconds to a Job function, and keep large files in Catalyst CloudScale Stratus.

Refer to the [AppSail Basics help page](https://docs.catalyst.zoho.com/en/serverless/help/appsail/appsail-basics/) and the [AppSail Configurations help page](https://docs.catalyst.zoho.com/en/serverless/help/appsail/appsail-configurations/) for details.