SpeechAce
Speech recognition API that scores pronunciation, fluency, and speaking proficiency.
About
SpeechAce is a developer API for spoken-language assessment: submit audio and get scores on pronunciation, fluency, grammar, coherence, and vocabulary, aligned to IELTS, PTE, and CEFR rubrics, down to phoneme-level feedback. It now covers Spanish and French alongside English and is used by publishers, language-learning apps, universities, and K-12 platforms.
It is strictly a B2B developer product — there is no consumer app — with Basic, Pro, and Premium tiers priced by audio length and scoring depth. The patented scoring models are a real differentiator in a crowded pronunciation space.
What it can do
- Pronunciation scoring at phoneme, word, and sentence level
- Fluency, grammar, coherence, and vocabulary scoring
- IELTS, PTE, and CEFR-aligned scores
- Spontaneous speech assessment
- English, Spanish, and French support
- REST API with sample code on GitHub
Setup
- Contact SpeechAce for an API key.
- Integrate the REST API into your learning app or platform.
- Submit learner audio with the reference text or task.
- Receive pronunciation, fluency, and proficiency scores to display to learners.
Prerequisites
Developer account and API key; application to integrate the API into.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Patented scoring models; detailed public API docs and GitHub samples; IELTS/PTE/CEFR alignment is a real differentiator; Strictly B2B developer product — no consumer app; Spanish and French support in beta. License: Proprietary API service..
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 7.0/10
- Maintenance · recency, releases, issue load
- 8.0/10
- Openness · license + docs
- 6.0/10
- Manual review · sanity read + red-flag check
- 8.0/10
- · Patented scoring models; detailed public API docs and GitHub samples
- · IELTS/PTE/CEFR alignment is a real differentiator
- · Strictly B2B developer product — no consumer app
- · Spanish and French support in beta
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.