Hard limits

This article focuses on Bubble's hard limits. Hard limits are fixed boundaries that cannot be exceeded, such as the number of minutes a workflow will attempt to finish before it's terminated. Some hard limits can be increased by upgrading to higher pricing plans.

For soft limits (flexible boundaries that can be exceeded in but may impact performance or stability) check out our general article on performance and scaling.

Like all development frameworks and server systems, Bubble comes with its own set of capabilities and limitations. While we are working hard to make a platform that is flexible and versatile enough to reliably handle as wide a range of applications as possible, we also want to be as transparent as we can with our developer community as to what kind of limitations you might experience.

This article will attempt to highlight known limitations and issues that should be taken into consideration when you are evaluating Bubble for your project.

Understanding the system limits

An app reaching Bubble’s hard limits is fairly rare, but as a developer it can still be useful to know about them to be able to recognize and debug them should they occur.

They can aid in the planning and development of your app, but it’s worth nothing that understanding and predicting how they can affect your app can be a bit more complicated. The limits offer insight into the system's absolute limits and can be valid in one-off cases, but they will be less accurate in predicting the app's performance under varying conditions and workloads.

For instance, if a Do a search for times out after a maximum limit of 10 seconds, it does not imply that a search that takes 3 seconds to complete is always "safe" in all situations. For example, a 3-second search that’s happening simultaneously for a million users will still, in aggregate, become very taxing for your app. At that scale, it would be best to redesign the search to complete faster. While hard limits will kick in in rare situations, it’s also important to keep in mind the combination of everything you’ve built your app to do.

Hard limits can clarify why a process has stopped due to reaching a time limit and serve as a reminder that a resource-intensive process will eventually reach its limit. However, this information must be incorporated into an overarching strategy to ensure that the app’s activity remains at sustainable levels that allows your app to scale safely.

Database

Text fields

A single text field saved in the database has a hard limit of 10 million characters. Keep in mind that this includes characters like spaces and BBCode/HTML formatting.

Thing size

The total size of data stored in one has a hard limit of 20 MB. This refers to data stored in the thing itself, and not associated data such as files and images.

Bulk operations from the data tab

Starting bulk operations using the Bulk button in the data tab has a hard limit of 20,000 things. In other words, you can schedule an API worflow on a maximum of 20,000 things. It's useful to note that you may approach a soft limit with a lower count depending on other factors, such as the complexity of the workflow and the amount of data stored in the things.

Deleting references to a thing

Sometimes when you delete a thing in the database, Bubble needs to update other records to reflect that the thing has been deleted. For example, a user might be connected to other records because they are referenced in the Created by field.

This can lead to a seemingly simple operation becoming more complex and resource-demanding. If the number of referenced records exceeds 100,000 records you may start to experience that referenced records are not properly updated, and by 1,000,000 there's a significant chance that the process will lead to unexpected database errors.

Storing a list of things

Storing a list of database things on another thing (such as User's Tasks) has a hard limit of 10,000 records. Note that long lists can start to affect performance at a lower number, depending on how much data the records are holding and what kind of processing you apply. In many cases, using Do a search for instead of storing long lists will be more efficient.

CSV Upload

CSV files uploaded in the Bubble editor or in your app have a hard file size limit of 5GB.

Design and logic

Workflow timeout

Workflows that take more than 300 seconds (5 minutes) will time out. Note that other processes running simultaneously can lead to Bubble throttling your app to maintain stability if your app comes close to maxing out its capacity. This can sometimes lead to workflows timing out because they are slowed down.

Number of elements and events/actions on a page

There's a hard limit of 10,000 combined total of elements, events and actions on a single page.

Length of URL

Bubble doesn't have a maximum URL lengths, but to ensure browser compatibility you should stay within 2,000 characters. We generally recommended keeping URLs as short as possible for usability and SEO purposes.

URL parameters are included in the character count.

Integrations

API Connector responses

There's a hard limit of 50 MB for responses to an outgoing API call made with the API Connector or a plugin. Exceeding the limit will generate an error in the logs: "response too large".

Headers in API calls

The headers in API calls can have a maximum total size of 8,000 characters

Keys in API calls

The keys in an API call can have a maximum total size of 20,000 characters.

Data API Concurrent requests

The Data API handles a set number of requests depending on your plan:

• Starter: 15 000

• Growth: 25 000

• Team: 35 000