Rasa Paraphraser

6.8easy start · #7 of 24
in AI Paraphrasing Tools

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Linux, self-hosted.

Rasa Paraphraser is ranked #7 of 24 in AI paraphrasing tools on The Geeks Club. It runs on Linux, Self-hosted. There is a free plan.

Rasa Paraphraser plans and pricing

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Rasa Paraphraser Free MIT-licensed open-source tool · requires Docker github.com · 4 Oct 2026

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The record

Purpose: It generates paraphrases of sentences that are intended to be semantically similar but lexically and structurally different.
Languages: The model supports 30 languages, but the README says the tool has only been tested in English, German, French, Spanish, and Russian.
Model: It uses a multilingual neural machine translation model from the Prism framework with diversity-promoting decoding changes.
Use case: Rasa says it was primarily built for data augmentation inside the Rasa Open Source framework and can also be used for other paraphrasing needs.
Run modes: The tool provides interactive command-line use and bulk generation from input files.
Input formats: Bulk mode accepts Rasa NLU training data or CSV rows containing a sentence and optional label.
Output formats: Bulk output can use Rasa NLU training data format or CSV, and includes similarity scores for generated paraphrases.
Deployment: The README instructs users to install Docker and documents CPU and GPU container builds and runs.
Quality option: A lightweight mode is described as around 2.5 times faster, with a possible negative effect on generation quality.
Generation controls: Command-line options control language, lexical diversity, n-gram penalization, beam search, and the number of candidate paraphrases.
Content safety: The README warns that the model can generate offensive content and says the tool does not currently filter or detect it.
License: The repository includes an MIT license.
Feedback: The README invites users to provide feedback.
Founded: 2016
Price from: Free

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Best AI Paraphrasing Tools in 2026#7 of 24

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Sources

github.com/RasaHQ/paraphraser· checked 4 Oct 2026
github.com/RasaHQ/paraphraser/blob/main/Readme.md· checked 4 Oct 2026
github.com/RasaHQ/paraphraser/blob/main/LICENSE· checked 4 Oct 2026