Does a published device lab show that a vendor can catch a translated string breaking on screen?

Not by itself. A translated string can overrun a button in German or lose its word spacing in Japanese, and the defect only shows up on the screen size and OS version a release ships to. Six of the 23 companies in this composition publish a device lab of 100 real devices or more, with a source. That count says a company has hardware to run a screen check on; whether a translated build was the one tested is a separate question for the vendor.

Does any field in this catalog record which languages a company is able to test in?

No published field states which languages a company is equipped to test in. Delivery locations and crowd-pool sizes are the two adjacent facts the catalog does record, and each speaks to where a team sits or how large an on-demand pool runs, without naming a language pair. A case study, when a company publishes one, can document which languages were covered on that release, but it is a record of a single project and does not describe every language the company supports today.

Does the published hourly rate cover what a project testing many languages will end up costing?

Not by itself. A localization run repeats the same test script once per language on every release, so total cost climbs with the number of locales in scope. Thirteen of the 23 companies in this composition publish an hourly rate, and each one publishes it as a single blended band rather than a per-language or per-run figure. That single band still gets multiplied by however many locales a project covers, and the size of that multiplier only shows up in a quote for the specific languages needed.

Do the companies with the Crowdtesting at scale tag publish an hourly rate?

One of the four companies carrying the Crowdtesting at scale tag publishes an hourly rate, a blended band of $25-49 an hour. The other three companies with the Crowdtesting at scale tag list crowdtesting among their services without a published rate attached to it.

Best Localization testing companies in 2026

QA Rating is published independently, and its publisher owns no company listed in this catalog.

23 testing companies in this catalog list Localization testing among their services. They are grouped below by what each is best suited for, in 10 groups. 4 of them hold a certificate confirmed by a register entry and 13 publish a rate card. Composition and order last changed on September 6, 2026.

23 companies. Ordered by the number of verified reviews on external platforms, highest first. Companies with an equal count are ordered by name.

The companies

Localization testing: 23 companies, grouped by what they are best suited for.
#	Company	Frameworks	Case studies	Published rates	Reviews
Nearshore for the EU At least one delivery location in the EU or the EEA, or in Ukraine, Georgia, Serbia or Moldova.
1	ScienceSoft	Selenium, Appium, REST Assured, Apache JMeter, SoapUI, Postman	2	Blended $50-99/hclutch.co	85
2	Testlio	Not published	5	Blended $25-49/hgoodfirms.co	76
3	Global App Testing	Not published	4	Not published	66
4	DeviQA	Playwright, Cypress, Selenium, Appium, k6	5	Blended $25-49/hclutch.co	44
5	QA Madness	Cypress, Playwright, Selenium, Appium, Robot Framework, WebdriverIO, k6, Apache JMeter	2	Blended $25-49/hclutch.co	44
6	Applause	Not published	3	Not published	39
7	TestFort	SAP, Selenium, Appium	5	Blended $25-49/hclutch.co	32
8	UNGUESS	Not published	1	Not published	27
9	a1qa	Selenium, Playwright, Cypress, WebdriverIO, Appium, Apache JMeter, Postman, Cucumber, k6, REST Assured, TestComplete, Katalon, SoapUI	3	Blended $25-49/hclutch.co	20
10	QATestLab	Salesforce, Selenium, Appium, Robot Framework, TestComplete, Apache JMeter, SoapUI, Postman	2	Blended $25-49/hclutch.co	17
11	QAwerk	Selenium, Robot Framework, Appium, TestNG, JUnit	3	Blended $25-49/hclutch.co	13
12	GlobalStep	Not published	Not published	Not published	0
13	Side	Not published	Not published	Not published	0
14	Testronic	Not published	Not published	Not published	0
Embedded team model The dedicated team engagement model is offered, and at least one published case study.
2	Testlio	Not published	5	Blended $25-49/hgoodfirms.co	76
4	DeviQA	Playwright, Cypress, Selenium, Appium, k6	5	Blended $25-49/hclutch.co	44
5	QA Madness	Cypress, Playwright, Selenium, Appium, Robot Framework, WebdriverIO, k6, Apache JMeter	2	Blended $25-49/hclutch.co	44
7	TestFort	SAP, Selenium, Appium	5	Blended $25-49/hclutch.co	32
9	a1qa	Selenium, Playwright, Cypress, WebdriverIO, Appium, Apache JMeter, Postman, Cucumber, k6, REST Assured, TestComplete, Katalon, SoapUI	3	Blended $25-49/hclutch.co	20
11	QAwerk	Selenium, Robot Framework, Appium, TestNG, JUnit	3	Blended $25-49/hclutch.co	13
15	Ubertesters	Not published	1	Blended $25-49/hclutch.co	7
16	ImpactQA	Oracle applications, SAP, Tricentis Tosca	5	Not published	0
Automation first Test automation is offered as a service, and at least one published case study reports a coverage or regression time metric.
1	ScienceSoft	Selenium, Appium, REST Assured, Apache JMeter, SoapUI, Postman	2	Blended $50-99/hclutch.co	85
4	DeviQA	Playwright, Cypress, Selenium, Appium, k6	5	Blended $25-49/hclutch.co	44
5	QA Madness	Cypress, Playwright, Selenium, Appium, Robot Framework, WebdriverIO, k6, Apache JMeter	2	Blended $25-49/hclutch.co	44
9	a1qa	Selenium, Playwright, Cypress, WebdriverIO, Appium, Apache JMeter, Postman, Cucumber, k6, REST Assured, TestComplete, Katalon, SoapUI	3	Blended $25-49/hclutch.co	20
11	QAwerk	Selenium, Robot Framework, Appium, TestNG, JUnit	3	Blended $25-49/hclutch.co	13
16	ImpactQA	Oracle applications, SAP, Tricentis Tosca	5	Not published	0
Device lab coverage A published device lab of 100 real devices or more, with a source.
4	DeviQA	Playwright, Cypress, Selenium, Appium, k6	5	Blended $25-49/hclutch.co	44
10	QATestLab	Salesforce, Selenium, Appium, Robot Framework, TestComplete, Apache JMeter, SoapUI, Postman	2	Blended $25-49/hclutch.co	17
17	PLUS QA	pytest, TestNG, JUnit, Selenium, Appium, Postman	Not published	Blended $50-99/hclutch.co	8
15	Ubertesters	Not published	1	Blended $25-49/hclutch.co	7
18	iXie Gaming	Playwright, pytest, Appium	3	Blended $50-99/hclutch.co	3
19	Latis Global	Not published	Not published	Not published	0
Security focus Security testing is offered, together with either penetration testing or a verified ISO/IEC 27001 certificate, and at least one published case study.
1	ScienceSoft	Selenium, Appium, REST Assured, Apache JMeter, SoapUI, Postman	2	Blended $50-99/hclutch.co	85
4	DeviQA	Playwright, Cypress, Selenium, Appium, k6	5	Blended $25-49/hclutch.co	44
5	QA Madness	Cypress, Playwright, Selenium, Appium, Robot Framework, WebdriverIO, k6, Apache JMeter	2	Blended $25-49/hclutch.co	44
10	QATestLab	Salesforce, Selenium, Appium, Robot Framework, TestComplete, Apache JMeter, SoapUI, Postman	2	Blended $25-49/hclutch.co	17
11	QAwerk	Selenium, Robot Framework, Appium, TestNG, JUnit	3	Blended $25-49/hclutch.co	13
Crowdtesting at scale The crowdtesting engagement model is offered, and a published tester pool of 10,000 people or more, with a source.
3	Global App Testing	Not published	4	Not published	66
6	Applause	Not published	3	Not published	39
8	UNGUESS	Not published	1	Not published	27
15	Ubertesters	Not published	1	Blended $25-49/hclutch.co	7
Nearshore for the USA At least one delivery location in Canada, Mexico, Central America or South America.
1	ScienceSoft	Selenium, Appium, REST Assured, Apache JMeter, SoapUI, Postman	2	Blended $50-99/hclutch.co	85
9	a1qa	Selenium, Playwright, Cypress, WebdriverIO, Appium, Apache JMeter, Postman, Cucumber, k6, REST Assured, TestComplete, Katalon, SoapUI	3	Blended $25-49/hclutch.co	20
12	GlobalStep	Not published	Not published	Not published	0
13	Side	Not published	Not published	Not published	0
Performance engineering Performance testing is offered as a service, and at least one published case study reports a throughput or latency metric.
7	TestFort	SAP, Selenium, Appium	5	Blended $25-49/hclutch.co	32
10	QATestLab	Salesforce, Selenium, Appium, Robot Framework, TestComplete, Apache JMeter, SoapUI, Postman	2	Blended $25-49/hclutch.co	17
Enterprises A verified ISO/IEC 27001 or SOC 2 certificate, a published team size of 201-500 or larger, and at least one named client that is a publicly traded company, each with a source. A company that publishes no team size does not carry this tag.
13	Side	Not published	Not published	Not published	0
Fast onboarding A published onboarding time of 14 days or less, with a source.
10	QATestLab	Salesforce, Selenium, Appium, Robot Framework, TestComplete, Apache JMeter, SoapUI, Postman	2	Blended $25-49/hclutch.co	17
Other companies in this axis No applicability tag met its criterion for these profiles.
20	Q-Pros	Not published	Not published	Blended from $300/hclutch.co	20
21	Lotus Quality Assurance	Selenium, Cypress, Appium, SoapUI, Apache JMeter	Not published	Not published	9
22	Bugwolf	Salesforce, Workday, SAP, Microsoft Dynamics 365, ServiceNow	Not published	Not published	0
23	Testbytes	Selenium, Apache JMeter, Appium	Not published	Blended up to $25/hclutch.co	0

What a native speaker actually checks

Localization testing checks more than translation accuracy. A translated string can read correctly and still break a layout, misread a date format, or use a currency symbol nobody in the target market recognizes. The 23 companies in this table list the service on their own site, but what turns that listing into something checkable is who runs the test: a person who reads the target language as a first language and knows the market's conventions from the inside. On this axis, the location of the tester determines what the test can actually verify.

Delivery location is one signal, and a partial one

Fourteen of the 23 companies carry the Nearshore for the EU tag, meaning at least one delivery location in the EU, the EEA, Ukraine, Georgia, Serbia or Moldova. Four carry the Nearshore for the USA tag, meaning a delivery location in Canada, Mexico, Central America or South America, and all four of those companies also carry the Nearshore for the EU tag, so no company on this page runs an Americas-only delivery footprint on its own. Delivery location says less about which languages a team covers than it first appears to. DeviQA and QA Madness deliver from Poland, and QAwerk from Ukraine: useful for Polish- or Ukrainian-market testing and for overlapping working hours with European clients, but a Warsaw or Kyiv office does not put a native Japanese or Arabic speaker on a project by itself. Headquarters carries even less information: ten of the 23 companies are headquartered in the United States, a fact about where a company is registered, not about where its testers live.

Crowd size is a more direct number, with a gap of its own

Four companies carry the Crowdtesting at scale tag, each with a published tester pool of 10,000 people or more. Applause publishes 1,500,000, Global App Testing 145,035, Ubertesters 120,000, and UNGUESS 60,000. A large, globally distributed pool matches what localization testing needs more closely than a fixed office does: it can supply a native speaker for a given market on demand instead of requiring a permanent local team. Applause's own case study on the ASICS Runkeeper app describes this directly: the app was tested with native speakers in 9 languages beyond English. None of the four companies publish how their pool breaks down by language or country, and the published total counts every crowdtesting engagement the company runs, not testers assigned to localization work specifically. Three of the four, Global App Testing, Applause and UNGUESS, also carry the Nearshore for the EU tag: a fixed European delivery base and an on-demand global crowd operate together at the same company.

What to ask instead of reading off the table

A delivery-location tag and a crowd-pool number both describe capacity, not coverage of the one language a specific project needs. A company with neither tag can still have the right tester for a rare locale, and a company with both can still lack one for a different locale. Ask the vendor directly which languages its nearshore staff or crowd pool cover for the market in question, and ask before the first project starts.

How this ranking was put together

Membership is computed from the profile, not chosen: companies appear here when they list Localization testing among their services, as their own profile states. Position in a ranking cannot be bought. Paid options are limited to the extended profile, labelled sponsor slots and lead forms, and none of them affect tags or order.

The table compares the fields that decide this axis: frameworks, case studies, published rates, plus the number of verified reviews on external platforms. Rates, minimum project size and onboarding time carry the source they came from next to the value.

Nearshore for the EU: At least one delivery location in the EU or the EEA, or in Ukraine, Georgia, Serbia or Moldova.
Embedded team model: The dedicated team engagement model is offered, and at least one published case study.
Automation first: Test automation is offered as a service, and at least one published case study reports a coverage or regression time metric.
Device lab coverage: A published device lab of 100 real devices or more, with a source.
Security focus: Security testing is offered, together with either penetration testing or a verified ISO/IEC 27001 certificate, and at least one published case study.
Crowdtesting at scale: The crowdtesting engagement model is offered, and a published tester pool of 10,000 people or more, with a source.
Nearshore for the USA: At least one delivery location in Canada, Mexico, Central America or South America.
Performance engineering: Performance testing is offered as a service, and at least one published case study reports a throughput or latency metric.
Enterprises: A verified ISO/IEC 27001 or SOC 2 certificate, a published team size of 201-500 or larger, and at least one named client that is a publicly traded company, each with a source. A company that publishes no team size does not carry this tag.
Fast onboarding: A published onboarding time of 14 days or less, with a source.

The criteria for this axis are on the methodology page, together with field definitions and the rule for editorial order. Changes of order are recorded in the changelog.

Questions

Does a published device lab show that a vendor can catch a translated string breaking on screen?: Not by itself. A translated string can overrun a button in German or lose its word spacing in Japanese, and the defect only shows up on the screen size and OS version a release ships to. Six of the 23 companies in this composition publish a device lab of 100 real devices or more, with a source. That count says a company has hardware to run a screen check on; whether a translated build was the one tested is a separate question for the vendor.
Does any field in this catalog record which languages a company is able to test in?: No published field states which languages a company is equipped to test in. Delivery locations and crowd-pool sizes are the two adjacent facts the catalog does record, and each speaks to where a team sits or how large an on-demand pool runs, without naming a language pair. A case study, when a company publishes one, can document which languages were covered on that release, but it is a record of a single project and does not describe every language the company supports today.
Does the published hourly rate cover what a project testing many languages will end up costing?: Not by itself. A localization run repeats the same test script once per language on every release, so total cost climbs with the number of locales in scope. Thirteen of the 23 companies in this composition publish an hourly rate, and each one publishes it as a single blended band rather than a per-language or per-run figure. That single band still gets multiplied by however many locales a project covers, and the size of that multiplier only shows up in a quote for the specific languages needed.
Do the companies with the Crowdtesting at scale tag publish an hourly rate?: One of the four companies carrying the Crowdtesting at scale tag publishes an hourly rate, a blended band of $25-49 an hour. The other three companies with the Crowdtesting at scale tag list crowdtesting among their services without a published rate attached to it.

Previous versions

Each year is frozen as it stood when the snapshot was taken, with the field values recorded at that date. This page always shows the current version.

The 2026 list: 22 companies, taken 2026-09-03. 1 entered and 0 left since.

Other axes these companies appear on

Industry: Ecommerce 17 of these 23 companies also stand there
Delivery location: Europe 16 of these 23 companies also stand there
Industry: Games 16 of these 23 companies also stand there
Industry: Healthcare 15 of these 23 companies also stand there

How to choose a vendor on this axis

Published by QA RatingPublished on September 3, 2026Updated on September 6, 2026

Every fact about a company comes from a listed source. A field without a source stays empty. A certificate counts as confirmed only when a registry, certificate or auditor report backs it; a certificate the company only claims about itself is published separately, under that label. Vendors can request a correction at hello@qa-rating.com. A correction is applied when it comes with a public source.