Building the voice of multilingual AI.

We support the full range of speech AI use cases: ASR (automatic speech recognition) training and evaluation, TTS (text-to-speech) data production, voice assistant and conversational AI development, speaker verification, emotion and sentiment detection, and more. Our team works with you to scope the right collection, annotation, and evaluation approach for your model’s specific requirements.

With 100+ country-level contributor networks covering 155+ locales, we have genuine depth for languages that most providers cannot staff reliably. For low-resource languages, we work with community-embedded networks to identify and verify native speakers. We are transparent about what we can source in your target variety before any program begins.

Quality of Experience (QoE) evaluation uses human listening panels, not just automated metrics, to assess how a trained speech model actually sounds to real users. Automated accuracy scores measure whether words are correct — they cannot tell you whether a synthesized voice sounds natural, whether prosody feels right, or whether an accent is rendered authentically. QoE evaluation fills that gap, producing perceptual scores across naturalness, fluency, intelligibility, and more.

Yes. Welo Data operates 14 secure delivery facilities globally for programs that require controlled recording environments, stricter data handling conditions, or restricted access setups. These facilities are ISO 27001 certified and staffed by on-site project management teams. If your program has specific security, acoustic, or access requirements, we can discuss facility options during scoping.

For many programs, we can deliver a pilot dataset in under two weeks from an agreed brief. Timelines depend on language, volume, and annotation complexity, and we will always scope these accurately before a program begins. The goal is to get you to a validation point quickly, so you can assess data quality before committing to full-scale production.

We handle the full pipeline under a single SLA with a dedicated program team. You can also engage us for individual stages if you already have existing data or vendors handling other parts of the workflow. Either way, you get one point of contact and one quality standard throughout.

Contributor authenticity is verified through NIMO, Welo Data’s proprietary workforce integrity platform, which continuously checks that contributors are who they claim to be, operating from a confirmed location, with validated language and domain credentials. For speech programs, we go further: we are also implementing third-party tooling to detect AI-generated audio, because a verified human contributor can still use generative AI to produce speech. Our integrity checks cover both the person and the work they submit.