Translation & localization buyer's guide
Written by the Happy Valley editors, reviewed by Mustafa Gezer. Updated October 20, 2026.
What is Translation & localization software?
Translation and localization software helps teams adapt apps, websites, documents and media for other languages and markets. Localization goes beyond translation: it manages text strings in code, keeps terminology consistent, handles plurals, dates and currencies, and gives translators context so the result reads naturally in each market.
Software teams use translation management systems (TMS) such as Lokalise, Crowdin, Phrase and Tolgee to sync strings with their code repositories. Website owners use tools like Weglot and Localize to translate a live site without rebuilding it, companies use machine translation like DeepL for documents and email, and video teams use AI dubbing tools such as Rask AI.
The category differs from simple translation apps, which translate a text once, and from translation agencies, which sell human work. Modern platforms combine machine translation, translation memory, glossaries and human review in one continuous workflow.
Key features to look for
- Developer integrations
- Sync with GitHub or GitLab, a CLI or an API so new strings reach translators and return without manual file exchange. Check support for your formats, such as JSON, XLIFF, YAML and Android or iOS strings.
- Translation memory and glossary
- Reusing past translations and enforcing approved terms cuts cost and keeps product names consistent across languages.
- Machine translation and AI
- Built-in engines such as DeepL or LLM-based translation give a first draft in seconds. Check which engines are included and whether you can use your own API keys.
- In-context editing
- Translators make fewer mistakes when they see strings in the real interface. Tolgee and Locize offer in-context editing, and screenshots help in other tools.
- Automated quality checks
- Checks for broken placeholders, length limits, inconsistent terms and untranslated strings catch bugs before a release ships.
- Workflow and roles
- Assign reviewers per language, flag strings for review and track progress, especially when mixing in-house staff, freelancers and agencies.
- Over-the-air updates
- Updating mobile app translations without a new app store release, offered by several TMS tools, saves weeks when a wrong string needs fixing.
How to choose Translation & localization software
- 1
Identify what you translate
App strings, a marketing website, help centre articles, documents and video need different tools, and few products cover all of them well.
- 2
Check your stack and formats
List your frameworks and repositories and confirm the tool supports them natively. Teams using i18next should look at Locize.
- 3
Decide the human and machine mix
Choose which content can ship with machine translation, which needs post-editing and which needs professional translators, then check the tool supports each path.
- 4
Model pricing at scale
Estimate source words or keys, number of languages and how often content changes, since most tools charge on these.
- 5
Pilot one language
Take one release into one new language end to end, including review, to measure the real effort and quality.
- 6
Check data handling
Confirm where texts are stored, whether machine translation providers keep or train on your content and whether translation memory can be exported.
Translation & localization pricing
- 53%
- offer a free plan, free tier or open-source edition
- $39
- median starting price per month
- $7
- lowest paid starting price (Locize)
Localization platforms usually charge by tier, with limits on hosted words or string keys, projects, languages and seats. Crowdin and Lokalise price by plan with word or key limits, Weglot charges by the number of translated words and languages on a website, and DeepL sells per-user subscriptions plus an API billed by characters. Tolgee is open source and can be self-hosted for free, with a paid cloud.
The platform is only part of the cost. Add machine translation usage beyond included quotas, human translation or post-editing, extra reviewer seats and higher tiers for SSO or over-the-air updates. Website tools get more expensive as page count and languages grow.
Based on 15 tools in this category with prices checked on vendor pages.
Best Translation & localization tools by need
- Best overallLokaliseLocalization platform for software teams
- Best free optionCrowdinLocalization management with 600+ integrations
- Best for small businessesDeepLHigh-quality machine translation and writing assistant
- Best for enterprisesPhraseEnterprise localization and TMS
- Best for freelancersSmartcatAI translation platform with a built-in marketplace of linguists
- Best open sourceTolgeeOpen-source localization with in-context editing
Recommendations by team type
- Indie developers and small apps
- Tolgee, Locize, POEditor and Localazy are affordable to start, and Localazy's shared translation memory helps with common interface strings.
- Websites and marketing teams
- Weglot and Localize translate a live site quickly with machine translation and human review, while DeepL handles documents and campaign copy.
- Software companies
- Lokalise, Crowdin and Phrase combine developer integrations, review workflows and translation memory for continuous localization across many languages.
- Enterprises
- Smartling, Phrase, LILT, Smartcat and Transifex offer AI translation with human review, vendor management and enterprise security; Rask AI covers video dubbing.
Translation & localization trends in 2026
Large language models now sit inside most localization platforms. Tools combine machine translation with automatic quality estimation, so only low-confidence strings go to human reviewers, and vendors such as Lokalise, Crowdin, Phrase and Smartling promote AI translation that follows glossaries and style guides. DeepL launched a next-generation language model and a voice translation product in 2024. AI dubbing with voice cloning and lip-sync, offered by Rask AI, has made video localization affordable, and continuous localization on every release is now standard for software teams.
Common mistakes to avoid
- Hardcoding text or joining sentence fragments in code, which makes correct grammar impossible in other languages.
- Publishing raw machine translation for legal, medical or brand-critical content without human review.
- Sending translators strings without context, screenshots or character limits.
- Skipping a glossary, so product names and key terms are translated differently on each screen.
- Forgetting localized SEO, such as hreflang tags and translated URLs, titles and meta descriptions.
Translation & localization in Turkey
Turkish is agglutinative, so sentences assembled from fragments in code break easily; use full-sentence strings with ICU placeholders. Turkish casing differs (i becomes İ and ı becomes I), which breaks naive uppercase and search code. Nouns stay singular after numbers (3 elma), so plural rules are simpler than in English. DeepL, Weglot and the main TMS tools support Turkish. For KVKK, prefer paid machine translation plans that do not keep your texts, and use a sworn translator for official documents.
Translation & localization FAQ
- What is the best Translation & localization software?
- Based on community votes and market presence, the leading Translation & localization tools right now are Lokalise, Crowdin, Phrase.
- Are there free Translation & localization tools?
- Yes. 1 tool in this category are free or open source, including Tolgee.
- What is the cheapest paid Translation & localization tool?
- Locize has the lowest listed starting price at $7.00 per month.
- What is the best free localization tool?
- Tolgee is open source and free to self-host, while Crowdin, Locize, POEditor and Localazy offer free plans for small or open-source projects. For one-off text, the free version of DeepL works well, but use a paid plan for confidential content. Free tiers limit words, keys or languages.
- Lokalise vs Crowdin: which is better?
- Both are mature TMS platforms for software teams, with repository sync, translation memory, machine translation and review workflows. Crowdin has a large integration marketplace and free plans for open-source projects, while Lokalise is known for its developer and designer workflow and over-the-air mobile updates. Compare them on your file formats and price at your key count.
- Is DeepL good enough for professional translation?
- DeepL gives high-quality drafts for many language pairs and offers glossaries, formality settings and a Pro plan that does not store your texts. For marketing, legal or published content, a human should still review the output. Many localization platforms let you use DeepL as their machine translation engine.
- How much does localization software cost?
- Developer-friendly tools start with free or low-cost plans, while enterprise TMS platforms use custom quotes. Costs grow with words or keys, languages and seats, plus any human translation you buy. Live starting prices for each tool are shown on this page.
- Do I need a TMS or is machine translation enough?
- Machine translation alone works for internal or low-risk content. Once you ship a product in several languages and update it often, a TMS saves time by syncing strings with code, reusing translations and managing review. Tolgee and Localazy are easy entry points.
- How can I translate a website quickly?
- Website translation tools like Weglot and Localize detect your site's text, translate it automatically and serve each language on its own URL, usually without code changes. Review key pages manually, translate URLs and metadata, and check that hreflang tags are added for search engines.