React Testing Library VS Testcontainers
As of 30 October 2026, Testcontainers is named by 112 companies and React Testing Library by 335; React Testing Library skews to companies under 200 people (57% vs 41%), Testcontainers to companies over 1,000 (39% vs 20%).
As of 30 October 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: React Testing Library's script and mail records show on hundreds of thousands of small sites, Testcontainers rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- React Testing Library: 2–200 employees
- 57%
- Testcontainers: 2–200 employees
- 41%
- React Testing Library: 1,000+ employees
- 20%
- Testcontainers: 1,000+ employees
- 39%
- Postings per company, 90 days
- 2.1 · 2.6
- Website or DNS footprint
- 0 · 0
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | React Testing Library | share | Testcontainers | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 5 | 1% | – | – | outside top 12 |
| 2-10 employees | 41 | 12% | 6 | 5% | React Testing Library |
| 11-50 employees | 75 | 22% | 21 | 19% | React Testing Library |
| 51-200 employees | 75 | 22% | 19 | 17% | React Testing Library |
| 201-500 employees | 48 | 14% | 7 | 6% | React Testing Library |
| 501-1000 employees | 23 | 7% | 15 | 13% | Testcontainers |
| 1001-5000 employees | 41 | 12% | 22 | 20% | Testcontainers |
| 5001-10000 employees | 7 | 2% | 5 | 4% | Testcontainers |
| 10,001+ employees | 20 | 6% | 17 | 15% | Testcontainers |
| Segment | React Testing Library | share | Testcontainers | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 204 | 61% | 65 | 58% | React Testing Library |
| Business & finance services | 65 | 19% | 25 | 22% | Testcontainers |
| Manufacturing & industry | 18 | 5% | 6 | 5% | even |
| Commerce & trade | 15 | 4% | 4 | 4% | even |
| Media & content | 10 | 3% | 2 | 2% | even |
| Consumer services & leisure | 7 | 2% | – | – | outside top 12 |
| Health care | 4 | 1% | – | – | outside top 12 |
| Transport, logistics & rental | 4 | 1% | 4 | 4% | Testcontainers |
| Utilities & infrastructure | 3 | 1% | 2 | 2% | even |
| Automotive | 2 | 1% | – | – | outside top 12 |
| Public, community & associations | 2 | 1% | 2 | 2% | even |
| Hospitality & travel | 1 | 0% | – | – | outside top 12 |
| Agriculture & forestry | – | – | 1 | 1% | outside top 12 |
| Property & construction | – | – | 1 | 1% | outside top 12 |
| Segment | React Testing Library | share | Testcontainers | share | Leans |
|---|---|---|---|---|---|
| United States | 192 | 57% | 47 | 42% | React Testing Library |
| United Kingdom | 35 | 10% | 12 | 11% | even |
| India | 22 | 7% | 2 | 2% | React Testing Library |
| Germany | 10 | 3% | 8 | 7% | Testcontainers |
| Canada | 9 | 3% | – | – | outside top 12 |
| France | 8 | 2% | 8 | 7% | Testcontainers |
| Australia | 5 | 1% | 2 | 2% | even |
| Poland | 5 | 1% | 7 | 6% | Testcontainers |
| Singapore | 5 | 1% | – | – | outside top 12 |
| Lithuania | 4 | 1% | – | – | outside top 12 |
| United Arab Emirates | 3 | 1% | – | – | outside top 12 |
| Brazil | 3 | 1% | 3 | 3% | even |
| Sweden | – | – | 6 | 5% | outside top 12 |
| Denmark | – | – | 3 | 3% | outside top 12 |
| Belgium | – | – | 2 | 2% | outside top 12 |
| Spain | – | – | 2 | 2% | outside top 12 |
| Segment | React Testing Library | share | Testcontainers | share | Leans |
|---|---|---|---|---|---|
| Software engineering | 891 | 94% | 302 | 88% | React Testing Library |
| Engineering (non-software) | 9 | 1% | 2 | 1% | even |
| IT operations & business systems | 8 | 1% | 2 | 1% | even |
| Data & AI | 4 | 0% | 10 | 3% | Testcontainers |
| Customer service & success | 2 | 0% | – | – | outside top 12 |
| Design & UX | 1 | 0% | – | – | outside top 12 |
| Quality, safety & environment | 1 | 0% | 3 | 1% | even |
| Sales | 1 | 0% | – | – | outside top 12 |
| Unclassified | 1 | 0% | – | – | outside top 12 |
| General management & consulting | – | – | 2 | 1% | outside top 12 |
| Marketing & communications | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using React Testing Library →
Companies using Testcontainers →
unit testing frameworks ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Testcontainers is named by 112 companies in job postings and React Testing Library by 335; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/react-testing-library-vs-testcontainers)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
React Testing Library vs Testcontainers: questions
Which is more used, React Testing Library or Testcontainers?
By companies naming it in their own job postings, React Testing Library (335) over Testcontainers (112). By website-and-DNS footprint, Testcontainers (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses React Testing Library?
57% of React Testing Library companies have 2 to 200 employees, against 41% for Testcontainers. 20% of React Testing Library companies have over 1,000 employees, against 39% for Testcontainers.
Do companies run both?
0 companies name both in their postings, usually React Testing Library in marketing and Testcontainers in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
Get either list your way
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Every company on either tool,
with the person who owns it
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