Sigma AI reviews · researched 15 Oct 2026
Is Sigma AI legit?
Mostly. Sigma AI is a real Madrid data company, founded in 2008 with offices in London and Miami, but it publishes no freelance rates or payment terms, and its few public worker reviews are mostly negative. Its job posts state no pay, applicants report unpaid tests that go unanswered, and workers describe per-minute transcription pay and one-sided contract terms, so ask for the rate and read the contract before you invest time.
, AITraining.jobs lists 90 open Sigma AI roles.
- Trustpilot2.6/57 reviews
- Read 15 Oct 2026
The Sigma AI review
Researched October 2026 · 10 sourcesIt pays ~$19–$51/hr (third-party reports).
Actively listing 90 open roles todayDaniel Tapias (CEO) and Nuria Gómez Bermejo (CFO) founded Sigma in Madrid in 2008; it also has offices in London and Miami. It collects and annotates speech, text, image and video data for AI and shows Google, Microsoft, AWS and Samsung among its clients and partners. Its own pages differ on size: 25,000+ to 70,000+ people and 500+ to 700+ languages, and its job posts claim over 30 years of experience.
Remote linguists work as freelancers under a commercial contract. None of the 95 posts on its careers feed on 15 October 2026 stated a rate, and Sigma publishes no payment schedule or method. Reviewers describe transcription paid per minute of audio; one reviewer says payments are regular.
Trustpilot 2.6/5 (7 reviews). Read October 2026.
90 open roles on Sigma AI, independently checked 18 Oct 2026.
Language-driven; native speakers worldwide across 700+ languages.
No Sigma-specific impersonation cases turned up. Real openings are listed at careers.sigma.ai, and Sigma's job posts say it never hires through agents or other third parties. Other companies share the Sigma name, so check the domain is sigma.ai. Never pay to get work; fake recruiters often start on text, WhatsApp or Telegram.
What people praise
What people complain about
- Applicants say they transcribed test audio (one says five files) and then heard nothing back, or got no answer to questions about a confusing test.
- A June 2026 reviewer says his wife, paid per minute of transcribed audio, sat unpaid meetings, lost work to crashes and had not been paid for about 80 hours over two weeks.
- A former freelancer cites poor project planning, recurring platform bugs, low freelance rates and disputes handled without transparency.
- A December 2025 reviewer says the contract came through Sigma's US office with one-sided clauses, and urges legal advice before signing. Sigma has not replied to any review.
Best for: Native or fluent speakers of the languages Sigma recruits for (many Spanish varieties, Indian and European languages) who want occasional remote transcription, annotation or recording work. Not for: Anyone who wants to know the rate before spending hours on tests, needs predictable income, or is not ready to read a freelance contract closely.
Honest catches
- Pay here is third-party reports, not measured live from a job feed, so treat it as a benchmark rather than a guaranteed rate.
Sources for this review
- Sigma AI: FAQs (founded 2008 in Madrid, offices, languages)
- Sigma AI: About (founders, headquarters, workforce)
- Sigma AI: homepage (experts, languages, clients and partners)
- Sigma AI Careers
- Sigma AI Careers: job feed (95 posts, read October 15, 2026)
- Sigma AI Careers: Venezuelan Spanish linguistic projects (Remote), posted September 29, 2026
- Trustpilot: sigma.ai reviews
- Trustpilot: sigma.ai reviews, all languages
- Trustpilot: sigma.ai 5-star reviews, all languages
- FTC Consumer Alert: That job offer text is probably a scam (April 30, 2026)
Got a message from Sigma AI?
Its real sites: sigma.ai. Paste the message to check the links, the sender and the pay.
What Sigma AI's job board shows
Read from its public job board every day: how much it lists, how often it states pay, who may apply and how fast roles come down, against every other platform this site reads.
Sigma AI listed 90 open roles on 17 Oct 2026, 2.5% of the 3,668 open across the 29 platforms AITraining.jobs reads, the 12th most.
Counted at the end of each week, Sigma AI went from 79 open roles on 9 Aug 2026 to 88 on 11 Oct 2026 (+11.4%); the highest count was 89 on 4 Oct 2026.
From 20 Sep 2026 to 17 Oct 2026, Sigma AI posted 23 new listings and removed 4; its open roles went from 71 to 90 (+26.8%).
None of its 90 open roles are open to applicants in any country (29.2% on other platforms); all are limited to listed countries, most often the United Kingdom (named by 52.2%).
Sigma AI against the other platforms
How does Sigma AI compare with the rest of the market on size, pay, reach and turnover?
| Measure | Sigma AI | Other platforms | Its rank (1 = highest) |
|---|---|---|---|
| Open roles on 17 Oct 2026 | 90 | 3,578 | 12th of 29 |
| Share of all open roles | 2.5% | 97.5% | 12th of 29 |
| New listings in the window | 23 | 2,229 | 11th of 29 |
| Kinds of work listed | 2 | 12 | joint 26th of 29 |
| Open roles stating an hourly rate | 0.0% | 84.7% | joint 24th of 25 |
| Median advertised paySmall sample | n/a | $65/hr | n/a |
| Open roles accepting any country | 0.0% | 29.2% | joint 16th of 25 |
| Median days listed, removed rolesSmall sample | n/a | 32.8 days | n/a |
Open roles at Sigma AI, week by week
Is Sigma AI listing more AI training roles or fewer?
| Week | Open at the end of the week | New listings |
|---|---|---|
| 3 to 9 Aug | 0 | |
| 10 to 16 Aug | 0 | |
| 17 to 23 Aug | 0 | |
| 24 to 30 Aug | 0 | |
| 31 Aug to 6 Sep | 2 | |
| 7 to 13 Sep | 2 | |
| 14 to 20 Sep | 0 | |
| 21 to 27 Sep | 7 | |
| 28 Sep to 4 Oct | 14 | |
| 5 to 11 Oct | 0 |
Sigma AI reviews: questions
Is Sigma AI legit?
Mostly. Sigma AI is a real Madrid data company, founded in 2008 with offices in London and Miami, but it publishes no freelance rates or payment terms, and its few public worker reviews are mostly negative. Its job posts state no pay, applicants report unpaid tests that go unanswered, and workers describe per-minute transcription pay and one-sided contract terms, so ask for the rate and read the contract before you invest time.
Is Sigma AI a scam?
No. Sigma AI is a real company. No Sigma-specific impersonation cases turned up. Real openings are listed at careers.sigma.ai, and Sigma's job posts say it never hires through agents or other third parties. Other companies share the Sigma name, so check the domain is sigma.ai. Never pay to get work; fake recruiters often start on text, WhatsApp or Telegram.
Does Sigma AI pay?
Yes. Genuine flexibility, but worker sentiment on pay is mixed-to-negative. Payouts: Freelance commercial contract; payment method and schedule are not published. Remote linguists work as freelancers under a commercial contract. None of the 95 posts on its careers feed on 15 October 2026 stated a rate, and Sigma publishes no payment schedule or method. Reviewers describe transcription paid per minute of audio; one reviewer says payments are regular.
What do workers say about Sigma AI?
Trustpilot 2.6/5 (7 reviews), read October 2026. Praise: One reviewer, posting in September 2025 and again in January 2026, praises supportive managers and regular payments. Complaints: Applicants say they transcribed test audio (one says five files) and then heard nothing back, or got no answer to questions about a confusing test.
How do I spot a fake Sigma AI recruiter?
No Sigma-specific impersonation cases turned up. Real openings are listed at careers.sigma.ai, and Sigma's job posts say it never hires through agents or other third parties. Other companies share the Sigma name, so check the domain is sigma.ai. Never pay to get work; fake recruiters often start on text, WhatsApp or Telegram.
Is Sigma AI hiring right now?
Yes. 90 open Sigma AI roles are listed on its public job board, read 18 Oct 2026. Counted at the end of each week, Sigma AI went from 79 open roles on 9 Aug 2026 to 88 on 11 Oct 2026 (+11.4%); the highest count was 89 on 4 Oct 2026.
Who is Sigma AI for?
Best for: Native or fluent speakers of the languages Sigma recruits for (many Spanish varieties, Indian and European languages) who want occasional remote transcription, annotation or recording work. Not for: Anyone who wants to know the rate before spending hours on tests, needs predictable income, or is not ready to read a freelance contract closely.