Frontend Frameworks

Bottleneck

Rate limiter that makes throttling easy for API calls and tasks.

Status
UnmaintainedNo commits in 2227 days.
Last checked
Checked · Oct 14, 2026
License
Open source
Pricing
Free tier · from $0

What it is

Bottleneck is a rate-limiting library designed to simplify the process of throttling API requests or any task. It helps prevent overloading services by controlling the frequency at which actions are executed, ensuring smooth operation under high load conditions.

Bottleneck stands out as a lightweight yet powerful library for managing task execution rates, offering developers an easy-to-use solution for implementing effective rate limiting without the need for complex configurations or additional services.

When it fits — and when it doesn’t

A good fit for

  • Developers needing to manage high-frequency operations without overwhelming backend systems.

  • Projects requiring precise control over API request rates to avoid hitting rate limits or service outages.

Look elsewhere if

  • Scenarios where real-time processing is critical and cannot tolerate any delay due to throttling.

  • Use cases that require complex, adaptive rate-limiting strategies beyond simple frequency controls.

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited documentation and examples

    The official documentation lacks comprehensive guides for complex use cases, making it difficult for new users to fully leverage the library.

  2. 02

    Performance degradation under extreme load conditions

    Bottleneck's performance can degrade when handling an extremely high volume of requests simultaneously, leading to increased latency and potential service disruptions.

  3. 03

    Limited support for advanced rate-limiting strategies

    The library does not natively support more sophisticated rate-limiting mechanisms such as token bucket or leaky bucket algorithms, which are crucial in certain high-load scenarios.

What it does well

  • Simplified rate limiting for API calls and tasks.

  • Supports both synchronous and asynchronous operations.

  • Flexible configuration options to tailor throttling behavior.

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

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Set up Bottleneck

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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