# ScriptGrain vs ChatGPT · an honest comparison > How ScriptGrain and ChatGPT differ on brand voice, and what each costs. ChatGPT pricing checked 9 August 2026. Canonical: https://scriptgrain.com/vs/chatgpt-custom-instructions # ScriptGrain vs ChatGPT ScriptGrain makes ChatGPT better at being you. Custom instructions apply the handful of preferences you can state about yourself. ScriptGrain measures your voice as 45 attributes from writing you have already published, connects to ChatGPT so it writes from that profile, and scores every draft against the measurement. ## The actual difference Custom instructions rely on what you can articulate about your own style, and most of a voice is habits you cannot see: function-word patterns, punctuation cadence, clause ordering. ScriptGrain measures 45 attributes from writing you have already published, including those unconscious markers, then plugs into ChatGPT through its connector so the assistant writes from the measured profile and every draft is scored against it. It is not a rival to ChatGPT; it is the part ChatGPT does not have. Custom instructions cost nothing on any ChatGPT plan, and the paid tiers buy a better model and higher limits rather than a better memory of your voice. ScriptGrain's Free plan measures your voice with no card; connecting it to ChatGPT is included on every plan, and the paid plans (from £12/month) add generation, polishing and the monthly voice monitor. ScriptGrain is not a replacement for the assistant you already use. It measures your voice from writing you have published and hands that profile to ChatGPT, Claude, Muse or any MCP client through its connector, then scores every draft against it. ScriptGrain makes your AI better at being you. [Connect ScriptGrain to ChatGPT](https://scriptgrain.com/works-with/chatgpt) [Every AI voice tool compared: prices, scores and API access, checked](https://scriptgrain.com/reference/ai-writing-voice-tools-matrix) · ScriptGrain · ChatGPT Entry price · £12/mo (Writer, 1 voice profile) · Free (custom instructions are on every plan) Free tier · Yes, See your own voice profile. No card. · ChatGPT's free tier includes custom instructions Voices on entry plan · 1 (3 on Operator, £29/mo) · One set of custom instructions per account How the voice is built · 45 measured style attributes, extracted from writing you have already published · A settings box holding roughly five self-reported preferences: tone, response length, communication style, preferred language, and free-text instructions. It applies what you can articulate about your style to every chat. ChatGPT figures read from their pricing page on 9 August 2026. ## Where ChatGPT is stronger The default AI writing surface for most people. Custom instructions are its personalisation layer: a settings box that applies your stated preferences to every chat. - A full general assistant: research, code, images, browsing and writing in one place - Custom instructions are free on every plan and take two minutes to set up - Excellent at following explicit instructions once you can state them If you want one assistant for research, code, brainstorming and quick drafts, ChatGPT is that product, and for casual replies where voice does not matter, custom instructions are plenty. Keep ChatGPT; give it your measured voice. ## Questions ### Is ScriptGrain better than ChatGPT? They solve the problem differently. Custom instructions rely on what you can articulate about your own style, and most of a voice is habits you cannot see: function-word patterns, punctuation cadence, clause ordering. ScriptGrain measures 45 attributes from writing you have already published, including those unconscious markers, then plugs into ChatGPT through its connector so the assistant writes from the measured profile and every draft is scored against it. It is not a rival to ChatGPT; it is the part ChatGPT does not have. If you want one assistant for research, code, brainstorming and quick drafts, ChatGPT is that product, and for casual replies where voice does not matter, custom instructions are plenty. Keep ChatGPT; give it your measured voice. ### How much does ChatGPT cost compared with ScriptGrain? ChatGPT's entry plan is Free (custom instructions are on every plan), with this free tier: ChatGPT's free tier includes custom instructions. ScriptGrain starts at £12/month (Writer, 1 voice profile) with a free plan: See your own voice profile. No card. ChatGPT figures read from their pricing page on 9 August 2026. ### Does ChatGPT learn my writing voice? A settings box holding roughly five self-reported preferences: tone, response length, communication style, preferred language, and free-text instructions. It applies what you can articulate about your style to every chat. ScriptGrain instead measures 45 style attributes from writing you have already published, and scores every draft against that measured profile. ## Other comparisons - [ScriptGrain vs Jasper](https://scriptgrain.com/vs/jasper) - [ScriptGrain vs Copy.ai](https://scriptgrain.com/vs/copy-ai) - [ScriptGrain vs Writesonic](https://scriptgrain.com/vs/writesonic) - [ScriptGrain vs Anyword](https://scriptgrain.com/vs/anyword) - [ScriptGrain vs Rytr](https://scriptgrain.com/vs/rytr) - [ScriptGrain vs Grammarly](https://scriptgrain.com/vs/grammarly) - [ScriptGrain vs HyperWrite](https://scriptgrain.com/vs/hyperwrite) - [ScriptGrain vs My Writing Twin](https://scriptgrain.com/vs/my-writing-twin) - [ScriptGrain vs Bloomberry](https://scriptgrain.com/vs/bloomberry) - [ScriptGrain vs EigenVox](https://scriptgrain.com/vs/eigenvox) - [ScriptGrain vs Noren](https://scriptgrain.com/vs/noren) - [ScriptGrain vs Acta AI](https://scriptgrain.com/vs/acta) - [ScriptGrain vs VoiceMoat](https://scriptgrain.com/vs/voicemoat) - [ScriptGrain vs ContentIn](https://scriptgrain.com/vs/contentin) - [ScriptGrain vs Claude](https://scriptgrain.com/vs/claude-projects)