NVIDIA Apex

by NVIDIA

Mixed-precision / fused ops library used in NeMo training.

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TL;DR

Best for whisper / Conformer training with FP16 / fused optimizers. Pricing: free.

Category
Open source
License
BSD-3-Clause
Stars
★ 9.0k
Last push
2026-08-04
Pricing
free
Platforms
Linux

What it is

NVIDIA's library of training primitives. BSD-3-Clause.

Best for: Whisper / Conformer training with FP16 / fused optimizers.
Watch out for: Build complexity; superseded for some uses by torch.amp.

Install / use

git clone https://github.com/NVIDIA/apex

Features

Speaker diarizationNo
Word-level timestampsYes
Streaming / real-timeNo
Languages supported99
HIPAA eligibleNo

Links

GitHub repo ↗

NVIDIA Apex vs Whipscribe

FeatureNVIDIA ApexWhipscribe
CategoryOpen sourceTranscription APIs
Pricingfree$4–$24 one-time packs (credits never expire) · $2 single unlock · 60 min free on signup
Speaker diarizationNoYes
Word timestampsYesYes
StreamingNoNo
Languages9999
PlatformsLinuxWeb, API, MCP

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