What is NLTK?
Provides access to linguistic corpora and text processing tools for tokenization, classification, parsing, and semantic analysis. Widely used in educational and research settings for computational linguistics work.
NLTK pricing
We don't have NLTK's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Free and open source
Platform & deployment
Independently observed- CLI
- macOS
- Linux
- Windows
Security & compliance
Known vulnerabilities: 76 (71 in the last 12 months), max severity CRITICAL sourcea count reflects scale & disclosure, not quality
NLTK FAQ
Common questions about NLTK, answered from independent, dated evidence.
What is NLTK?
Provides access to linguistic corpora and text processing tools for tokenization, classification, parsing, and semantic analysis. Widely used in educational and research settings for computational linguistics work. It is indexed under NLP Apis.
Source: https://www.nltk.org
Is NLTK free to use?
NLTK is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.
Source: https://www.nltk.org
What platforms does NLTK support?
NLTK supports Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://www.nltk.org
Is NLTK open source?
Yes. NLTK is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Source: https://github.com/nltk/nltk
NLTK alternatives
Other nlp apis we track, ranked by the same independent score.
- CohereEnterprise AI that you fully control and deploy according to your requirementsmedium · 55%
- TextRazorNLP API for extracting meaning and understanding from textlow · 24%
- spaCyProduction-grade Python library for natural language processinglow · 39%
- Amazon ComprehendManaged natural language processing service for analyzing text and extracting structured insightsmedium · 54%
- Hugging Face TransformersAn open-source library for building and working with pre-trained transformer models for natural language, vision, audio, and multimodal tasks.low · 5%
- Stanford CoreNLPA Java library for extracting linguistic information from textlow · 34%
Compare NLTK
Side by side against other nlp apis, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for NLTK, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 63 | 0.14 | 8.5 | ✓ |
| Release cadence | 99 | 0.08 | 8.0 | ✓ |
| Dependent projects | 79 | 0.05 | 4.3 | ✓ |
| Stars | 79 | 0.05 | 3.7 | ✓ |
| Security score | 53 | 0.05 | 2.9 | ✓ |
| Capabilities | 0 | 0.08 | 0.0 | - |
| Integrations | 0 | 0.05 | 0.0 | - |
| Security posture | 0 | 0.12 | 0.0 | - |
| Package downloads | 0 | 0.04 | 0.0 | - |
| Developer Q&A activity | 0 | 0.14 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 100 | mediumsource · 2026-09-24 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 4 items | mediumsource · 2026-09-10 · 69% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Python | highsource · 2026-09-24 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-09-24 · 95% |
Pricing
Release
Security
Is NLTK the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank NLTK against the rest of the nlp apis we index, using the same dated evidence weighted your way.
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