Catch missing keys and broken variables in translated JSON and CSV catalogs.
LaunchLint is a self-hosted localization QA application that compares source and translated JSON or CSV catalogs. It helps software teams, indie game studios and localization agencies identify structural issues before release: missing keys, empty translations, changed placeholders, common printf mismatches, unbalanced tags and differences in line-break counts. Configurable warnings cover text length, expansion, glossary terms and unchanged translations. Findings show source and target text side by side and can be searched, filtered and exported as CSV or JSON. The package includes: • Complete Python application and SQLite database schema. • Responsive English interface. • User accounts and saved rule presets. • Administrator console for managing Pro access. • Server-enforced Free and Pro limits. • Configurable Stripe Checkout integration. • 56 passing automated tests, sample catalogs and deployment documentation. Version 1 supports flat JSON objects with string values and CSV files containing key,value columns. Nested JSON, PO/XLIFF and ICU plural/select validation are not supported. Recognized ICU patterns are flagged for manual review. LaunchLint checks structure and explicit rules, not translation accuracy, fluency or rendered text width. Current status: pre-revenue, with no customers or production-user traffic. The buyer must deploy the full application and configure their own payment account. Visual browser verification and a real Stripe checkout remain to be completed. No independent security audit has been performed.
Project details
Next step: <p>Start by completing browser verification, deploying the full application, configuring support and commercial terms, and testing Stripe payments.</p><p>The buyer could then validate the product with software teams, indie studios or localization agencies and test the proposed Pro pricing.</p><p>Potential improvements include nested JSON, PO/XLIFF support, engine-specific placeholder rules and command-line or CI integrations. These features are not included in the current release.</p>
For sale
Asking price: $1,200 USD
What's included
Source code, All related design work
Complete application source code, original interface design, database schema, automated tests, illustrative source/target catalogs, sample reports, operator documentation and deployment instructions are included. No domain, full-application hosting, customer data, logo, photography, social accounts, email account or Stripe account is included. Any exclusive rights transfer and support obligations must be separately agreed.
Reason for selling
I built LaunchLint as a focused software asset for acquisition. I am offering it to a technical buyer who can take ownership of deployment, customer acquisition and further development, particularly a software team, localization agency or operator with an existing professional network.
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