Whatlang Rs: the address we list did not respond · last checked 12 Nov 2026
Whatlang Rs
Pure Rust language detection library for 80+ languages.
A no-frills, performant language detection library for Rust developers who need offline, lightweight identification. Lacks advanced features like confidence scores, but excels in speed and simplicity. Best for straightforward use cases.
Verdict generatedLast checked 9/9/2026 · cite: rightaichoice.com/tools/whatlang-rs
- Rust developers needing offline language detection
- Builders of CLI tools for text processing
- Lightweight web services with low resource constraints
- Embedded systems requiring minimal dependencies
- Non-developers seeking a ready-to-use GUI application
- Applications requiring confidence scores or probability estimates
- Scenarios needing language family or dialect detection
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Skip Whatlang if you need confidence scores, mixed-language support, or detection of language families—it only returns a label, not probabilities or dialects.
Whatlang is free and open source, making it ideal for hobbyists and cost-conscious teams. Unlike commercial APIs that charge per request, it has zero runtime cost, but you trade features like confidence scores and language families that paid solutions like Google Cloud Translation or AWS Comprehend offer.
In short
Whatlang Rs — Pure Rust language detection library for 80+ languages. Best for Rust developers needing offline language detection, Builders of CLI tools for text processing, Lightweight web services with low resource constraints. Free to use.
What is Whatlang Rs?
Whatlang Rs — Pure Rust language detection library for 80+ languages. Best for Rust developers needing offline language detection, Builders of CLI tools for text processing, Lightweight web services with low resource constraints. Free to use.
Whatlang is a lightweight, pure Rust natural language detection library optimized for speed and low resource usage. It identifies both language and script from text using n-gram frequency analysis, supporting over 80 languages. Designed for developers, it works offline with no external dependencies, making it suitable for CLI tools, web services, and embedded systems. The library is open source under MIT license and can be added via Cargo. A live demo is available at whatlang.org for quick testing. While it lacks confidence scores or language family detection, its minimal footprint and fast performance make it a solid choice for basic language identification in Rust projects.
Key features
- Language detection for 80+ languages
- Script detection (Latin, Cyrillic, Arabic, etc.)
- N-gram based frequency analysis algorithm
- Pure Rust implementation with no native dependencies
- No external dependencies or network calls
- Lightweight and fast, optimized for short texts
- Open source under MIT license
- Online live demo at whatlang.org
- Rust crate for easy Cargo integration
- Supports library usage in CLI tools, web services, embedded systems
- Offline operation
- Support for multiple scripts per language
Our long-form take written Jul 25, 2026 is more than 90 days old, so it is being re-reviewed against current data and is not shown.
Limitations
- Whatlang does not provide confidence scores or probabilities, which may be limiting for applications requiring threshold-based decisions.
- Its performance on very short texts (e.g., single words) is reduced compared to longer inputs.
- The library also does not support language family detection or mixed-language texts.
as of 2026-08-25
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Is Whatlang Rs still active?
Whatlang Rs: the address we list did not respond · last checked 12 Nov 2026.
Viability score
How well maintained and how widely used is Whatlang Rs? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: November 2026
How we score →What do users say about Whatlang Rs?
What people actually say about Whatlang Rs — is it worth it?
Our community sentiment research written Jul 5, 2026 is more than 90 days old, so it is being re-reviewed against current data and is not shown.
How we verified this
Every listed fact about Whatlang Rs — pricing, features, links, status — is re-read from the vendor's own pages by our verification pipeline and each change is logged with a date; the last pass ran on 9 Sep 2026. Analysis is drafted with AI models and checked against our editorial standards before publishing; see how we verify.
Verification history
We have re-verified Whatlang Rs 8 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — changed link health
- — changed website status
- — changed website status
- — changed domain expiry
- — changed website status, link health
- — changed SSL certificate
Showing the 6 most recent of 8 verification passes.
Free to cite with attribution — this page re-verifies continuously.
How much does Whatlang Rs cost in 2026?
Whatlang Rs: Free to use. Pricing last verified 9 Sep 2026.
Where the pricing makes sense
The company stage and team size where Whatlang Rs's pricing actually pencils out — and where peers do it cheaper.
Whatlang is free and open source, making it ideal for hobbyists and cost-conscious teams. Unlike commercial APIs that charge per request, it has zero runtime cost, but you trade features like confidence scores and language families that paid solutions like Google Cloud Translation or AWS Comprehend offer.
Has Whatlang Rs' pricing changed?
No plan price for Whatlang Rs has moved since we began logging in Aug 2026; the pricing page is re-read on every verification pass.
Who should pick Whatlang Rs?
Pick Whatlang Rs if you are Rust developers needing offline language detection, Builders of CLI tools for text processing, Lightweight web services with low resource constraints, Embedded systems requiring minimal dependencies.
Look elsewhere if you are Non-developers seeking a ready-to-use GUI application, Applications requiring confidence scores or probability estimates, Scenarios needing language family or dialect detection, Multi-language text blocks where each sentence is a different language.
Skip it if Skip Whatlang if you need confidence scores, mixed-language support, or detection of language families—it only returns a label, not probabilities or dialects.
GeneratedReal-world workflow fit
Concrete scenarios for the personas Whatlang Rs actually fits — and what changes day-one when you adopt it.
Building a web API that needs to detect language of user comments for moderation or routing.
Outcome: Add the `whatlang` crate via Cargo, call `detect()` on the input text, and return the language code—no external service or network call needed.
Writing a command-line utility to identify the language of files or piped input.
Outcome: Whatlang's lightweight API makes it straightforward to integrate, producing fast language identification for each line or file without heavy dependencies.
Developing a device that needs to classify text locally without cloud connectivity.
Outcome: With no native dependencies and offline operation, Whatlang runs on constrained hardware, enabling on-device language detection for logs or user input.
Use cases
- Detect language of user-submitted text in a Rust web app
- Classify multilingual documents by language in a batch processing tool
- Route text to appropriate language-specific NLP pipelines
- Build a CLI tool to identify language of files or stdin input
- Integrate language detection into a chatbot for response localization
- Filter or tag content based on language in a content management system
- Identify the language of logs or telemetry data in a monitoring tool
- Enable automatic language selection in a text editor or IDE plugin
Setup time & first value
How long it actually takes to get something useful out of Whatlang Rs — broken out by persona, not the marketing-page minute.
For a Rust developer: under 5 minutes to add the crate and run the demo. CLI/web/embedded integration typically within an hour, depending on your specific parsing needs.
Switching to or from Whatlang Rs
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- ↗To CLD3 or Tika: if you need confidence scores, mixed-language support, or more languages, replace Whatlang's `detect()` calls with CLD3 or Tika's detector, which offer richer output.
Resources & guides
Tutorials & Learning
YouTube returned 6 videos for “Whatlang Rs”, and we withheld 6: 6 could not be judged, because “Whatlang Rs” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Whatlang Rs.
Official links
What are the best Whatlang Rs alternatives?
The closest alternatives to Whatlang Rs we list are Simplemma, Swiftide and Boundary ML. Ranked by direct product-type match, not category overlap.
| Alternative | Pricing | Starts at | Last verified |
|---|---|---|---|
| Simplemma | Free | Free | — |
| Swiftide | Free | Free | — |
| Boundary ML | Freemium | Pricing not published | — |
Alternatives to Whatlang Rs
View all
Simplemma
Simplemma is a pure-Python multilingual lemmatizer that returns dictionary lemmas across 35 languages.
Swiftide
Open-source Rust library for building streaming, parallel LLM pipelines — data indexing, retrieval-augmented generation, and autonomous agents.
Boundary ML
BAML is a type-safe language with an agent-ready CLI for building, testing, tracing and querying LLM functions.
Tools that pair well with Whatlang Rs
Common stack mates teams adopt alongside Whatlang Rs, with the specific reason each pairing earns its keep.
Simplemma
Simplemma is a pure-Python multilingual lemmatizer that returns dictionary lemmas across 35 languages.
Swiftide
Open-source Rust library for building streaming, parallel LLM pipelines — data indexing, retrieval-augmented generation, and autonomous agents.
Boundary ML
BAML is a type-safe language with an agent-ready CLI for building, testing, tracing and querying LLM functions.
Whatlang Rs vs its closest rival
Whatlang Rs's closest head-to-head is with Bito.
Our Whatlang Rs vs Bito verdict written Jul 5, 2026 is more than 90 days old, so it is being re-reviewed against current data and is not shown.
Head-to-head comparisons
Frequently asked questions
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