Which pricing innovation dramatically expanded the market for professional translation software between 2015-2020?

The translation technology market has transformed dramatically in the past decade, changing how businesses approach global communication and localization. Major language tech companies have competed to develop the most accurate, contextually-aware translation tools. This poll tests your knowledge about a significant product pricing strategy that revolutionized the translation technology industry and made these tools more accessible to everyday users and small businesses.

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Subscription-based translation APIs with tiered usage limits that allowed developers to embed translation capabilities in apps
One-time purchase model with lifetime updates for specialized industry-specific translation dictionaries
Pay-per-word model that charged users based on the exact volume of text translated each month
Freemium model offering basic translation for free but charging for pronunciation guides and dialect options