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ToneMarker — Yoruba Tone Marking Tool

Every tone mark returned by this tool is drawn directly from verified native-speaker Yoruba text. When the corpus does not resolve a word, the tool says so honestly. No invented tones. No statistical guessing.

11.8M
Corpus words
45K+
Toned word types
313K+
Phrase patterns
13K+
Full sentences
Free Resource
Yoruba ToneMarker
Paste Yoruba text and receive tone-marked output drawn from 11.8 million words of verified native-speaker text. Words not yet resolved appear in red.
AfroLangTech
Loading Yoruba tone database…
Yoruba ToneMarker
Free Access Runs in your browser 500 words per submission
0 of 500 words
Input text
Toned output
Tone-marked text will appear here…
A note on tonal ambiguity. Output is drawn from attested corpus text. Monosyllabic words such as ni, si, lo, wa, ko, ba may need review as context determines their tone. The confidence score below counts these as matched once a grammar rule applies, the same as a verified dictionary word — so a high score does not guarantee every monosyllabic word is correct.
Unmatched words detected (highlighted in red above).
These items have been logged for review and will be incorporated into the next database update within 24 hours. We invite you to resubmit the same text after that period for improved coverage.

For large documents requiring immediate professional annotation, please write to acelearnservices@gmail.com. Professional tone marking is available from $80 per 1,000 words. Full pricing is available in the Services section below.
A note on methodology. ToneMarker operates by matching input text against a verified reference corpus of over 12 million Yoruba words, sourced from documented native-speaker materials. Tone marks are assigned at the sentence, trigram, and word levels in order of precision. The system does not generate tones algorithmically or through machine learning inference. All unmatched items are flagged and referred for human review. For documents where linguistic precision is paramount, we recommend our professional annotation service.
Professional Services
Annotation Services for Scholars and Institutions
Professional Yoruba tone annotation, corpus development, and linguistic data services for researchers, publishers, and technology organisations worldwide. All annotation is performed by a trained linguist with extensive experience in Yoruba corpus work.
Short Document
Up to 1,000 words. Fully tone-marked, proofread, and delivered within 48 hours.
$80 per document
Medium Document
1,000 to 5,000 words. Domain-specific annotation available across health, legal, and educational registers.
$300 per document
Extended Document
5,000 to 20,000 words. Includes genre classification and morphological annotation upon request.
$800 per document
Corpus and Bulk Projects
Projects exceeding 20,000 words. Custom datasets for natural language processing, text-to-speech, and automatic speech recognition. Licensing available.
Quotation on request
Linguistic Annotation
Part-of-speech tagging, morphological analysis, named entity recognition, and dependency parsing for Yoruba text.
$0.10 per word
Research Collaboration
Academic consultation, dataset validation, and scholarly review for Yoruba language research and NLP projects.
$150 per hour

Enquiries and custom quotations

To submit a document or discuss your specific requirements, please write to us directly. We respond within 24 hours.
Clients within Nigeria may request pricing in Naira.

acelearnservices@gmail.com
User Responses
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