Product Guides
All articles on product guides — practical guides for ESL professionals writing in English.
Bring-Your-Own-Key (BYOK) for Language Tools: What It Actually Means
BYOK is becoming standard in AI-powered writing tools. This guide explains what it means technically, what it costs in practice, and what to check before you share your key with any service.
7 min read · 2026-04-14Comparing English Writing Assistants: Grammarly vs LanguageTool vs Local Tone
Three English writing tools with different philosophies: Grammarly for surface-level polish, LanguageTool for open-source grammar, and Local Tone for L1-transfer and regional calibration. Here's how they compare for non-native professional writers.
9 min read · 2026-04-11