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OpenNMT

Free#107 of 156 in Translation SoftwareLanguage Translation Software

OpenNMT: A technical toolkit for training, serving, and optimizing custom neural translation models. Ranked #107 of 156 in Translation Software by our editors (3.0/10); pricing: Free plan; best for engineers training and serving custom MT models.

3.0/10Editor score
Visit OpenNMT
OpenNMT3.0 Visit OpenNMT

At a glance

  • Editor score
    3.0 / 10
  • Pricing
    Free plan
  • Best for
    Engineers training and serving custom MT models
  • Free plan
    Yes
  • Paid from
    Free
  • API access
    Yes
  • Founded
    2016
  • Facts checked
    22 Sep 2026
OpenNMT screenshot

  • Where it wins

    • Supports configurable neural machine translation architectures and training procedures
    • Combines terminology dictionaries, translation memory, and word alignment tools
    • Offers command-line, REST serving, and CTranslate2 optimized inference

  • Where it doesn't

    • Requires engineering expertise rather than offering a hosted translation workflow
    • Focuses on custom model development over end-user translation features
    • Uses an ecosystem of tools and implementations instead of tiered paid plans

Our verdict on OpenNMT

OpenNMT is an open-source ecosystem for neural machine translation and neural sequence learning. It is designed for researchers, developers, and organizations building custom translation or other sequence-learning systems. The project provides implementations based on PyTorch and TensorFlow, along with configurable model architectures, training workflows, inference, model serving, and APIs. Its broader scope also includes summarization, text generation, tagging, image-to-text, and speech-to-text tasks.

OpenNMT follows an open-source model rather than tiered hosted pricing, with a free plan and no paid plans described. Its platform fit is centered on engineering workflows: text translation is available through command-line tools and libraries, while a REST translation server can serve trained models. The ecosystem also includes tokenization tools and model export with optimized inference through CTranslate2. That combination suits teams that need control over model training, deployment, and inference rather than a ready-to-use translation service.

Its strongest differentiator is the depth of its custom-model toolkit. Teams can train neural machine translation models, configure training procedures, apply user-provided terminology dictionaries, use fuzzy matching with translation-memory files, and generate word alignments. These capabilities support specialized translation pipelines where terminology and model behavior need direct control. OpenNMT is a strong choice for engineers building and serving custom models; organizations seeking a hosted, end-user translation product should choose a different type of tool.

Your product? Our editors can test OpenNMT in depth and publish a review, labelled as paid · from $149/mo →

OpenNMT pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on opennmt.net

OpenNMT fact sheet

Free planYes
Paid fromFree
Document translationNot verified
Website translationNot verified
Translation memoryYes
Glossary toolsYes
API accessYes
Supported languagesNot verified
DeploymentSelf-hosted
SupportCommunity, Docs
Built forSmall business, Mid-market, Enterprise (editorial estimate)
PricingFree plan
Websiteopennmt.net
Facts checked22 Sep 2026

Alternatives to OpenNMT

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Also Ranked In

OpenNMT is ranked in 2 of our directories.

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Featured on iTechGuides

Featured on iTechGuides — OpenNMT 3.0/10

OpenNMT is listed in our Translation Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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