Bottleneck
Rate limiter that makes throttling easy for API calls and tasks.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Verified · Jul 12, 2026Overview
What is Bottleneck?
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.
Key differentiator
“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.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
The official documentation lacks comprehensive guides for complex use cases, making it difficult for new users to fully leverage the library.
Bottleneck's performance can degrade when handling an extremely high volume of requests simultaneously, leading to increased latency and potential service disruptions.
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.
Fit analysis
Who is it for?
✓ Best 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.
✕ Not a fit for
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.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Works well with
Next step
Get Started with Bottleneck
Step-by-step setup guide with code examples and common gotchas.