ScriptGrain vs WriteBros

ScriptGrain measures your voice as 45 attributes and scores every draft against them, with the method published. WriteBros rewrites AI drafts to read as human and, on its $79 Pro plan, clones voices from the places you already write; it publishes no voice score.

The actual difference

WriteBros rewrites AI drafts into natural writing and, on Pro, into a trained voice; its pages publish no voice score and no list of what a voice is measured on. ScriptGrain measures your voice as 45 named attributes, scores every draft against them with the method published, and puts the API and MCP server on every plan, including Free. WriteBros also says every plan passes GPTZero, Turnitin, Copyleaks and ZeroGPT. ScriptGrain's humaniser rescores each pass and makes no detector promise, for the reasons set out in voice preservation vs detector evasion.

WriteBros starts at $12 a month for 30,000 words, and voice cloning, the REST API and the MCP server all sit on Pro at $79 a month. ScriptGrain's Writer plan is £12 a month with one measured voice profile and a score on every draft, and the API and MCP connector come with every plan, including Free.

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 Claude

Every AI voice tool compared: prices, scores and API access, checked

ScriptGrainWriteBros
Entry price£12/mo (Writer, 1 voice profile)$12/mo (Lite)
Free tierYes, See your own voice profile. No card.Free: 1,000 words for the lifetime of the account, up to 1,500 a request, no card and no voice cloning
Voices on entry plan1 (3 on Operator, £29/mo)None on Lite. The pricing page puts voice cloning on Pro ($79/mo); one of their landing pages also lists a trained voice on Plus ($30/mo)
How the voice is built45 measured style attributes, extracted from writing you have already publishedYou connect the places you already write, such as Slack, Reddit, LinkedIn, X and your documents, and that writing "trains a private model that's yours alone", which they say is never used to train anyone else's. You can train a separate voice for each place you write and switch between them with one click; drafts are then rewritten in that voice. The home page's example sums a voice up in three traits: sentences, tone and style. No voice score, attribute list or scoring method is published.

WriteBros figures read from their pricing page on 25 September 2026.

Where WriteBros is stronger

"The most natural AI humanizer." A rewriting tool that turns stiff AI drafts into natural writing, with an AI detector from Lite up and, on Pro, voice cloning: trained voices per platform or per client, callable through a REST API and an MCP server.

If the job is turning large volumes of AI drafts into natural-sounding copy, with a trained voice for each of up to 25 people or channels on one $79 plan, WriteBros is built around exactly that, and it reads your voice from the places you already write. ScriptGrain measures a voice and holds each draft to it. It makes no promise about AI detectors, so if passing one is the requirement, ScriptGrain is the wrong tool.

Questions

Is ScriptGrain better than WriteBros?

They solve the problem differently. WriteBros rewrites AI drafts into natural writing and, on Pro, into a trained voice; its pages publish no voice score and no list of what a voice is measured on. ScriptGrain measures your voice as 45 named attributes, scores every draft against them with the method published, and puts the API and MCP server on every plan, including Free. WriteBros also says every plan passes GPTZero, Turnitin, Copyleaks and ZeroGPT. ScriptGrain's humaniser rescores each pass and makes no detector promise, for the reasons set out in voice preservation vs detector evasion. If the job is turning large volumes of AI drafts into natural-sounding copy, with a trained voice for each of up to 25 people or channels on one $79 plan, WriteBros is built around exactly that, and it reads your voice from the places you already write. ScriptGrain measures a voice and holds each draft to it. It makes no promise about AI detectors, so if passing one is the requirement, ScriptGrain is the wrong tool.

How much does WriteBros cost compared with ScriptGrain?

WriteBros's entry plan is $12/mo (Lite) (Plus $30/mo; Pro $79/mo carries voice cloning, the REST API and MCP; no annual price shown), with this free tier: Free: 1,000 words for the lifetime of the account, up to 1,500 a request, no card and no voice cloning. ScriptGrain starts at £12/month (Writer, 1 voice profile) with a free plan: See your own voice profile. No card. WriteBros figures read from their pricing page on 25 September 2026.

Does WriteBros learn my writing voice?

You connect the places you already write, such as Slack, Reddit, LinkedIn, X and your documents, and that writing "trains a private model that's yours alone", which they say is never used to train anyone else's. You can train a separate voice for each place you write and switch between them with one click; drafts are then rewritten in that voice. The home page's example sums a voice up in three traits: sentences, tone and style. No voice score, attribute list or scoring method is published. ScriptGrain instead measures 45 style attributes from writing you have already published, and scores every draft against that measured profile.

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