What are the best alternatives to Appen in 2026?
Answer in brief: Appen is our winner for best for speech, so the right alternative depends on what you need it to do. For speech and multilingual programs at very large scale, choose TELUS Digital, our speech runner-up. For computer vision, choose Sama (runner-up: iMerit). For LLM post-training, choose Surge AI (runner-up: Mercor). For enterprise fine-tuning, choose Snorkel AI (runner-up: Scale AI). On a tight budget, choose Prolific (runner-up: Toloka). This is independent research based on each company's own published pages. We did not test any service.
Top Appen alternative: TELUS Digital. TELUS Digital is the closest like-for-like replacement for a large multilingual program. It reports a community of more than 1 million contributors, 500+ annotation languages and dialects, and more than 2 billion labels a year, and it calls itself an independent, neutral partner. Visit TELUS Digital →
Why buyers compare Appen alternatives
- Expert-level LLM work. Appen now sells frontier alignment (expert RLHF, SFT, red teaming, RL environments), but its crowd-scale heritage is older than its frontier-expert positioning. Ask for references on expert-level work.
- Modality fit. Vision-heavy or post-training-heavy programs may get more depth from a specialist.
- Budget. Appen prices by quote. Some teams need self-serve pricing.
Best alternative for each use case
| Use case | Best alternative | Runner-up | Why switch |
|---|---|---|---|
| Speech and multilingual scale | TELUS Digital | Surge AI (70+ languages, LLM-focused) | 1M+ contributors; 500+ languages and dialects |
| Computer vision | Sama | iMerit | 99% first-batch acceptance claim; LiDAR and DICOM depth |
| LLM post-training | Surge AI | Mercor | RL environments, verifiers, RLHF; published gains |
| Enterprise fine-tuning | Snorkel AI | Scale AI | Labeling, fine-tuning and evaluation in one platform |
| Budget | Prolific | Toloka | Published fees; no minimums |
The picks in detail
- TELUS Digital: reports more than 4 million audio prompts from over 5,000 contributors in 50 regions for one voice-assistant program, adding 35 languages. Visit TELUS Digital →
- Sama: production image, video and 3D point-cloud labeling, an 8-year average customer tenure, and a certified B Corp. Visit Sama →
- iMerit: part of EXL; 25,000+ iMerit Scholars; Ango Hub covers DICOM, LiDAR and audio. Visit iMerit →
- Surge AI: the full post-training stack, with off-the-shelf data that Trusted Program labs can train on before paying. Visit Surge AI →
- Mercor: 5M+ experts and APEX benchmarks for professional work. Visit Mercor →
- Snorkel AI: Snorkel Flow plus expert data-as-a-service for enterprise teams. Visit Snorkel AI →
- Scale AI: enterprise evaluation, monitoring and fine-tuning, plus physical-AI data. Visit Scale AI →
- Prolific: participant rewards plus a 42.857% corporate or 33.33% academic fee. Visit Prolific →
- Toloka: usage-based self-serve pricing with no minimums or contracts. Visit Toloka →
When to stay with Appen
Appen remains our speech winner. It covers ASR, conversational, medical and code-switched speech in 500+ locales, licenses audio datasets such as 30,000 hours of U.S. call-centre calls, and documents consent and provenance. Visit Appen → For ready-made datasets from many vendors, see Best AI datasets.
FAQ
What is the best alternative to Appen?
TELUS Digital, for large multilingual and speech programs. Sama is the best alternative for computer vision, Surge AI for LLM post-training, Snorkel AI for enterprise fine-tuning and Prolific for small budgets.
Is TELUS Digital bigger than Appen for languages?
TELUS Digital says it supports 500+ annotation languages and dialects. Appen says it covers 500+ locales. The two counts measure different things, so compare the specific languages you need.
Is there a cheaper Appen alternative?
Prolific publishes its fees and has no minimum commitment, and Toloka offers usage-based self-serve pricing with no minimums or contracts.
Keep comparing
Appen vs TELUS Digital · Sama vs iMerit · Appen review · TELUS Digital review · Sama review · Full ranked list of training data companies