Limits

There are some hard and soft limits that you might hit.

Concurrency limits

Pricing tier	Limit
Free	10 concurrent runs
Hobby	25 concurrent runs
Pro	100+ concurrent runs

Additional bundles above the Pro tier are available for $50/month per 50 concurrent runs. Contact us via email or Discord to request more.

Rate limits

Generally speaking each SDK call is an API call.

Limit	Details
API	1,500 requests per minute

You can request a higher rate limit from us if you’re on a paid plan.

The most common cause of hitting the API rate limit is if you’re calling trigger() on a task in a loop, instead of doing this use batchTrigger() which will trigger multiple tasks in a single API call. You can have up to 1,000 tasks in a single batch trigger call with SDK 4.3.1+ (500 in prior versions).

Queued tasks

The number of queued tasks by environment.

Limit	Details
Dev	At most 500
Staging	At most 10 million
Prod	At most 10 million

Schedules

Pricing tier	Limit
Free	10 per project
Hobby	100 per project
Pro	1,000+ per project

Additional bundles above the Pro tier are available for $10/month per 1,000 schedules. Contact us via email or Discord to request more.

When attaching schedules to tasks we strongly recommend you add them in our dashboard if they’re “static”. That way you can control them easily per environment.

If you add them dynamically using code make sure you add a deduplicationKey so you don’t add the same schedule to a task multiple times. If you don’t your task will get triggered multiple times, it will cost you more, and you will hit the limit.

If you’re creating schedules for your user you will definitely need to request more schedules from us.

Preview branches

Pricing tier	Limit
Free	Not available
Hobby	5 preview branches
Pro	20+ preview branches

Additional bundles above the Pro tier are available for $10/month per preview branch. Contact us via email or Discord to request more.

Realtime connections

Pricing tier	Limit
Free	10 concurrent connections
Hobby	50 concurrent connections
Pro	500+ concurrent connections

Additional bundles are available for $10/month per 100 concurrent connections. Contact us via email or Discord to request more.

Task payloads and outputs

Limit	Details
Single trigger payload	Must not exceed 3MB
Batch trigger payload	Each item can be up to 3MB (SDK 4.3.1+). Prior: 1MB total combined
Task outputs	Must not exceed 10MB

Payloads and outputs that exceed 512KB will be offloaded to object storage and a presigned URL will be provided to download the data when calling runs.retrieve. You don’t need to do anything to handle this in your tasks however, as we will transparently upload/download these during operation.

Batch size

A single batch can have a maximum of 1,000 items with SDK 4.3.1+. Prior versions are limited to 500 items.

Batch trigger rate limits

Batch triggering uses a token bucket algorithm to rate limit the number of runs you can trigger per environment. Each run in a batch consumes one token.

Pricing tier	Bucket size	Refill rate
Free	1,200 runs	100 runs every 10 sec
Hobby	5,000 runs	500 runs every 5 sec
Pro	5,000 runs	500 runs every 5 sec

How it works: You can burst up to your bucket size, then tokens refill at the specified rate. For example, a Free user can trigger 1,200 runs immediately, then must wait for tokens to refill (100 runs become available every 10 seconds).

Batch processing concurrency

The number of batches that can be processed concurrently per environment.

Pricing tier	Limit
Free	1 concurrent batch
Hobby	10 concurrent batches
Pro	10 concurrent batches

This limits how many batches can have their items actively being processed into runs at the same time.

Log retention

Pricing tier	Limit
Free	1 day
Hobby	7 days
Pro	30 days

Log size

We limit the size of logs to prevent oversized data potentially causing issues.

Show log limits

Attribute Limits

• Span Attribute Count Limit: 256
• Log Attribute Count Limit: 256
• Span Attribute Value Length Limit: 131072 characters
• Log Attribute Value Length Limit: 131072 characters

Event and Link Limits

• Span Event Count Limit: 10
• Link Count Limit: 2
• Attributes per Link Limit: 10
• Attributes per Event Limit: 10

I/O Packet Length Limit

128 KB (131,072 bytes)

Attribute Clipping Behavior

• Attributes exceeding the value length limit (1028 characters) are discarded.
• If the total number of attributes exceeds 256, additional attributes are not included.

Attribute Value Size Calculation

• Strings: Actual length of the string
• Numbers: 8 bytes
• Booleans: 4 bytes
• Arrays: Sum of the sizes of all elements
• Undefined or null: 0 bytes

Alerts

An alert destination is a single email address, Slack channel, or webhook URL that you want to send alerts to.

Pricing tier	Limit
Free	1 alert destination
Hobby	3 alert destinations
Pro	100+ alert destinations

If you’re on the Pro plan and need more than the plan limit, you can request more by contacting us via email or Discord.

Machines

The default machine is small-1x which has 0.5 vCPU and 0.5 GB of RAM. You can optionally configure a higher spec machine which will increase the cost of running the task but can also improve the performance of the task if it is CPU or memory bound.

See the machine configurations for more details.

Team members

Pricing tier	Limit
Free	5 team members
Hobby	5 team members
Pro	25+ team members

Additional seats are available for $20/month per seat. Contact us via email or Discord to request more.