This is mainly for my own entertainment, Google gives a $100 credit each month and I didn't know what to do with it, so I use it to avoid wasting it.

VietPhrase Writer is a novel writing tool that runs in the browser, integrating an AI assistant directly in the editor. Unlike writing stories on ChatGPT or Gemini, Writer helps the AI remember characters, settings, and plot developments across hundreds of chapters thanks to a worldbuilding system with activation keywords, automatic chapter summaries, and vector memory. It supports Claude, OpenAI, Gemini, DeepSeek, and self-hosting — using your API key, data is stored 100% on the device, completely free.

VietPhrase Writer addresses the biggest problem when writing long novels with AI: AI forgets.

In Chapter 1, you describe the character in detail — by Chapter 20, ChatGPT forgets everything. 50 chapters with 3000 words each, no model fits. Writer solves it by automatically managing context for the AI:

Smart worldbuilding — Save characters, locations, organizations, items in a hierarchy system. Assign keywords to each entry — when you mention a character's name in the chapter, the AI automatically receives the relevant information without needing to paste manually. Character developments (Progressions) track changes across chapters, ensuring the AI writes the correct current state.

Long-term memory — Each chapter is automatically summarized, recaps created in groups of 8 chapters, and vector memory uses embedding to find the most relevant passages to the current writing. The AI only receives necessary context — not overwhelmed, not missing anything.

AI assistant right in the editor — Chat to discuss scenarios, brainstorm ideas, analyze characters right next to the draft. Ghost text autocomplete — press Tab to accept. 4 editor modes: continue writing, rewrite, expand, condense. 4 analysis templates: consistency, character, timeline, pacing.

No vendor lock-in — Supports Claude, OpenAI, Gemini, DeepSeek, Vertex AI, or any OpenAI compatible provider. Switch providers at any time, no data loss. Your API key — no subscription, no usage limits.

Data on the device — All data is stored in IndexedDB on the browser. It does not send to any server except for the AI API when you explicitly request. Backup ZIP or sync with Google Drive / GitHub Gist.

Main features

• Worldbuilding: characters, locations, organizations, items — hierarchy, tags, activation keywords, relationships
• Character developments (Progressions) — track changes across chapters
• Chapter summaries + automatic recaps in groups of 8 chapters
• Vector memory — remember semantic meanings throughout the story using embedding
• Integrated AI chat in the editor — discuss scenarios, brainstorm
• Ghost text autocomplete
• 5+ AI providers: Claude, OpenAI, Gemini, DeepSeek, self-hosted
• Plan View — overview of the entire novel
• Heatmap — character appearances matrix by chapter
• AI worldbuilding — describe ideas, AI generates characters/settings in bulk
• 4 writing modes: default, web novel, literature, script
• 4 AI analyses: consistency, character, timeline, pacing
• Context Inspector — see exactly what the AI receives, token allocation
• Snapshots — chapter version history
• Import/Export: TXT, Markdown, backup JSON
• Import/Export worldbuilding: JSON, share between projects
• Sync with Google Drive / GitHub Gist
• Character aliases — AI recognizes different names as the same entity
• Mobile responsive — write on smartphones, tablets
• PWA — install like an app, run offline
• Dark mode, customize font/size/line spacing