Best Flutter Localization Tools in 2025: Complete Comparison Guide
Looking for the best tool to localize your Flutter app? This comprehensive guide compares the top Flutter localization platforms in 2025, analyzing features, pricing, and use cases to help you choose the right solution.
Quick Comparison Table
| Tool | Flutter Focus | Free Tier | Starting Price | AI Translation | Best For |
|---|---|---|---|---|---|
| FlutterLocalisation | Flutter-only | Yes | $9/month | Yes (Flutter-aware) | Flutter developers |
| Localizely | Multi-platform | Yes (250 strings) | $16/month | Machine translation | Small teams |
| Lokalise | Enterprise TMS | No (trial only) | $120/month | Yes (Pro AI) | Large enterprises |
| POEditor | Multi-format | Yes (1,000 strings) | $14.99/month | Yes (GPT, Gemini, Claude) | Open source projects |
| Crowdin | Multi-platform | Yes (1 project) | $40/month | Yes | Multi-platform teams |
| Phrase | Enterprise | No | Custom | Yes | Enterprise workflows |
1. FlutterLocalisation
Best for: Flutter developers who want a specialized, affordable solution
FlutterLocalisation is the only localization platform built exclusively for Flutter. It focuses on the ARB file workflow that Flutter developers use daily.
Key Features
- Flutter-first design: Every feature is optimized for Flutter's ARB format
- AI-powered translations: Context-aware AI that understands Flutter syntax
- Visual side-by-side editor: See source and translations together
- Automatic placeholder validation: Catch
{variable}errors before they break your app - Git integration: Sync with GitHub, GitLab, or Bitbucket
- ICU message format support: Full support for plurals, gender, and select
Pricing
| Plan | Price | Highlights |
|---|---|---|
| Free | $0 | Core features, limited projects |
| Pro | $9/month | Unlimited AI translations, Git sync |
| Team | $29/month | Full collaboration features |
Pros
- Purpose-built for Flutter ARB workflow
- Most affordable option for Flutter developers
- AI understands Flutter-specific syntax
- 5-minute setup
Cons
- Flutter only (not for multi-platform teams)
- No over-the-air updates yet
Verdict: Best choice for Flutter-focused teams who want simplicity and value.
2. Localizely
Best for: Small teams needing OTA updates
Localizely is a general-purpose translation management system that supports multiple platforms including Flutter.
Key Features
- Over-the-air updates: Push translations without app releases
- Flutter SDK: Native SDK for OTA delivery
- Multi-platform: Supports iOS, Android, Flutter, web
- Translation memory: Reuse translations across projects
- Figma integration: Import strings from designs
Pricing
| Plan | Price | String Limit |
|---|---|---|
| Free | $0 | 250 strings |
| Starter | $16/month | 500 strings |
| Advanced | $32/month | 1,000 strings |
| Pro | $65/month | 2,500 strings |
Pros
- Over-the-air translation updates
- Good free tier for small projects
- Multi-platform support
Cons
- Not Flutter-optimized
- String limits on all plans
- More expensive than Flutter-specific tools
Verdict: Good for teams that need OTA updates and work across platforms.
3. Lokalise
Best for: Large enterprises with complex workflows
Lokalise is an enterprise-grade translation management system with 60+ integrations and advanced workflow automation.
Key Features
- Enterprise integrations: 60+ tools (Figma, Contentful, Slack, etc.)
- Flutter OTA SDK: Over-the-air translation updates
- Advanced workflows: Branching, task chains, automation
- Professional translation: Order translations from providers
- Enterprise security: SOC 2, ISO 27001 certified
Pricing
| Plan | Price | Features |
|---|---|---|
| Trial | Free (14 days) | Full access |
| Essential | ~$120/month | 5,000 keys |
| Pro | ~$230/month | 10,000 keys, glossary |
| Enterprise | $70,000+/year | Full enterprise suite |
Pros
- Comprehensive enterprise features
- Best-in-class security certifications
- OTA updates for Flutter
- Massive integration ecosystem
Cons
- Very expensive ($1,440+/year minimum)
- Overkill for small teams
- Complex setup
Verdict: Only for large enterprises with big budgets and complex requirements.
4. POEditor
Best for: Open source projects and multi-format needs
POEditor is a flexible translation management platform supporting 25+ file formats, used by companies like Bosch, UNICEF, and IKEA.
Key Features
- 25+ file formats: JSON, XLIFF, PO, ARB, iOS Strings, Android XML
- Multiple AI providers: OpenAI GPT, Google Gemini, Anthropic Claude
- Unlimited contributors: On all paid plans
- Open source program: Free for OSS projects
- API & webhooks: Automation-friendly
Pricing
| Plan | Monthly | String Limit |
|---|---|---|
| Free | $0 | 1,000 strings |
| Start | $14.99 | 3,000 strings |
| Plus | $44.99 | 10,000 strings |
| Premium | $119.99 | 30,000 strings |
Pros
- Generous free tier (1,000 strings)
- Free for open source projects
- Multiple AI translation options
- Unlimited contributors
Cons
- Flutter is just one of many formats
- Generic UI not optimized for ARB
- String limits on all plans
Verdict: Great for open source maintainers or teams using multiple formats.
5. Crowdin
Best for: Multi-platform teams with community translations
Crowdin is a cloud-based localization platform popular with open source projects and gaming companies.
Key Features
- Community translations: Let users contribute translations
- Over-the-air delivery: Push updates without releases
- In-context editor: Translate directly in your app preview
- Machine translation: Multiple providers supported
- GitHub/GitLab Apps: Direct repository integration
Pricing
| Plan | Price | Projects |
|---|---|---|
| Free | $0 | 1 project |
| Pro | $40/month | Multiple projects |
| Team | $150/month | Team features |
| Enterprise | Custom | Full suite |
Pros
- Strong community translation features
- Good open source support
- In-context translation preview
Cons
- Not Flutter-specific
- Can be complex to configure
- Mid-range pricing
Verdict: Good for projects that rely on community-contributed translations.
6. Phrase (formerly Memsource)
Best for: Enterprise localization with professional translators
Phrase is an enterprise localization suite combining translation management with professional translation services.
Key Features
- Translation memory: Advanced reuse across projects
- Professional translation network: Access to translators
- CAT tools integration: Works with translator workflows
- Enterprise security: SOC 2, ISO certified
- Advanced QA: Comprehensive quality checks
Pricing
Custom pricing only. Typically starts at several hundred dollars per month.
Pros
- Professional translator workflows
- Advanced translation memory
- Enterprise compliance
Cons
- No public pricing
- Overkill for most Flutter teams
- Not Flutter-optimized
Verdict: For enterprises with dedicated localization teams and professional translators.
How to Choose the Right Tool
Choose FlutterLocalisation if:
- You build Flutter apps exclusively
- You want the most affordable option
- You prefer Flutter-optimized AI translations
- You value simplicity over complexity
- You don't need over-the-air updates (yet)
Choose Localizely if:
- You need over-the-air translation updates
- You work across Flutter and other platforms
- You have a small team with limited budget
- You want translation memory features
Choose Lokalise if:
- You're a large enterprise (100+ employees)
- You need SOC 2/ISO compliance
- You require 60+ integrations
- Budget is not a concern ($1,400+/year)
Choose POEditor if:
- You maintain open source projects
- You need multiple file formats
- You want choice of AI providers
- You need unlimited contributors
Choose Crowdin if:
- You want community-contributed translations
- You need in-context translation preview
- You're building games or community apps
Feature Comparison Matrix
| Feature | FlutterLocalisation | Localizely | Lokalise | POEditor | Crowdin |
|---|---|---|---|---|---|
| ARB Support | Native | Supported | Supported | Supported | Supported |
| AI Translation | Flutter-aware | Basic MT | Pro AI | Multiple AI | Multiple MT |
| OTA Updates | Coming soon | Yes | Yes | No | Yes |
| Git Integration | Yes | Yes | Yes | Yes | Yes |
| Free Tier | Yes | Yes | No | Yes | Yes |
| Placeholder Validation | Yes | No | No | No | No |
| ICU Format | Full | Full | Full | Full | Full |
| Multi-platform | No | Yes | Yes | Yes | Yes |
| Enterprise Security | Standard | Standard | SOC 2, ISO | Standard | SOC 2 |
Pricing Comparison (Annual Cost)
For a typical Flutter app with 5,000 strings and 10 languages:
| Tool | Annual Cost | Notes |
|---|---|---|
| FlutterLocalisation Pro | $108 | Unlimited strings |
| Localizely Pro | $780 | 2,500 string limit |
| Lokalise Essential | $1,440 | 5,000 key limit |
| POEditor Plus | $540 | 10,000 string limit |
| Crowdin Pro | $480 | Multiple projects |
Best value for Flutter developers: FlutterLocalisation at $108/year
The Verdict
For most Flutter developers, FlutterLocalisation offers the best combination of features, simplicity, and value.
Here's why:
- Flutter-first: Every feature is designed for Flutter's ARB workflow
- Best pricing: $9/month vs $16-120/month for alternatives
- AI that understands Flutter: Handles placeholders, plurals, and ICU format correctly
- Fastest setup: 5 minutes from signup to translating
However, if you need over-the-air updates today, Localizely or Lokalise are your options until FlutterLocalisation adds this feature.
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