Fastai vs Keras

Side-by-side — pricing, strengths, tradeoffs, and fit.

Fastai

High-level deep learning library built on PyTorch for vision, text, tabular data and collaborative filtering.

Keras

High-level neural networks API for TensorFlow and other backends.

At a glance

Open SourceFree Tier
● Established·From $0
Open SourceFree Tier
● Established·From $0

Overview

One-liner

High-level deep learning library built on PyTorch for vision, text, tabular data and collaborative filtering.

One-liner

High-level neural networks API for TensorFlow and other backends.

Maturity

Established

Maturity

Established

Open source

✓ Yes

Open source

✓ Yes

Pricing

Free tier

✓ Available

Open source — free to use

Free tier

✓ Available

Open source — free to use

Starts at

$0

Starts at

$0

Model

Flat rate

Model

Flat rate

Enterprise

✕ None

Enterprise

✕ None

Best for

✓ Best for

Developers who need a high-level API to quickly prototype deep learning models without diving into low-level details.
Teams working on projects involving image classification, text processing, and collaborative filtering.

✓ Best for

Data scientists who need a high-level API to quickly prototype deep learning models without worrying about low-level details.
Teams working on image and text classification tasks that require rapid experimentation with different neural network architectures.

Not ideal for

✕ Not for

Projects requiring real-time inference where latency is critical
Applications that require extensive customization at the lower levels of PyTorch

✕ Not for

Projects requiring real-time inference where performance is critical, as Keras might introduce additional overhead compared to lower-level frameworks.
Developers who prefer a more low-level control over the training process and need fine-grained tuning of their models.

Strengths

↑ Strengths

High-level API for fast prototyping and experimentation
Supports a wide range of data types including vision, text, tabular, and collaborative filtering
Built on top of PyTorch with extensive documentation and tutorials

↑ Strengths

User-friendly API for rapid prototyping and experimentation.
Modular and extensible architecture supporting custom layers, loss functions, and metrics.
Supports multiple backends including TensorFlow, CNTK, and Theano.
Built-in support for convolutional neural networks (CNN), recurrent neural networks (RNN), and more.

Weaknesses

↓ Weaknesses

Limited support for non-Python ecosystems
Frequent breaking changes between versions
Documentation is extensive but not always up-to-date

↓ Weaknesses

Limited support for advanced neural network architectures
Performance overhead due to abstraction layer
Dependence on backend library stability and support
Limited customization options for advanced users
Full Fastai profile →Full Keras profile →