What are the best tools to make AI write like me in 2026?
For most people the best start is free: a style note plus two or three real samples in Claude or ChatGPT custom instructions or a Project. Marketing teams that need one shared brand voice should look at Jasper Brand Voice, and Grammarly brand tones suit teams who want tone hints while they type. Idiolect is a free beta connector with a voice score. Ownhand fits people who send many kinds of messages through an agent and want each draft fitted to the occasion and learning from what they actually sent.
I built Ownhand, so read this knowing that. Every claim about another product comes from that vendor's own pages as of 4 October 2026, linked under Sources. Where a vendor page didn't say something, I left it out.
The seven options side by side
| Tool | Where your voice comes from | Where you use it | Cost | Best for |
|---|---|---|---|---|
| A prompt you write yourself | A style note and two or three samples you paste in | Any chat window | Free | Trying the idea in ten minutes |
| ChatGPT custom instructions, memory, Projects | Your note, files in a Project, what memory keeps | ChatGPT | Free on every plan that has them | People who already draft in ChatGPT |
| Claude instructions, Projects, skills | Your note, samples in project knowledge or a skill | Claude | Free; five Projects on the free plan | People who already draft in Claude |
| Grammarly brand tones | A questionnaire where you pick sentences that sound right | Suggestions while you type | Pro and up; one profile on Pro | Teams who write by hand and want tone hints |
| Jasper Brand Voice | Up to 8 examples: text, files or URLs | Jasper's chat, editor and agents | Pro per seat, Business on request | Marketing teams sharing one brand voice |
| Idiolect | 3 to 5 examples, or a guided interview | MCP clients and its own Studio | Personal plan free in beta | Solo writers who want a voice score |
| Ownhand | 5 to 10 things you sent, then the text you send after each draft | Any MCP client, or the HTTP API | $1 free, then about half a cent per rewrite | Agent users who send many kinds of messages |
1. A prompt with your own samples
Open a chat, paste three messages you actually sent, say where each one went, and ask for the next draft in the same voice. That's the whole method. It works better than most people expect, because the model can copy your sentence length and your openers from real text far more easily than from words like "punchy" or "warm".
The catch is upkeep. You paste the samples again in every new chat, and the prompt never hears about the edits you make in Gmail before sending. The custom instructions page has a template you can copy.
Pick it if you write a few emails a week and want to know whether samples help before you set anything up.
2. ChatGPT: custom instructions, Projects and memory
This is the same prompt, saved. Custom instructions hold 1,500 characters on Free and Go and 5,000 on paid plans, enough for a short note and one sample. A Project gives you more room: drop a file of your sent emails into it, and its instructions replace your global ones inside that Project. Memory keeps preferences you state, like "keep replies short". It never sees the version you finally sent from another app.
Pick it if you already write in ChatGPT and mostly need one kind of text, say client emails, to sound less stiff. The full walkthrough is how to make ChatGPT write in your voice.
3. Claude: instructions, Projects and skills
Claude has the same three layers under different names. Instructions for Claude apply to every chat. A Project holds samples as knowledge files, and a free account gets five Projects. A skill can bundle your rules with example texts so Claude loads them when the task matches.
You may have seen guides recommending Claude Styles. Anthropic is folding styles into skills, and a custom style you made moves over as a skill you switch on. Ownhand vs Claude styles covers what that means.
Pick it if Claude is where you draft and a Project per kind of writing is enough structure. Steps are in how to make Claude write like you.
4. Grammarly brand tones
Grammarly comes at the problem from the other side. You write the text yourself, and Grammarly comments on it as you go. To set a brand tone, an admin or manager answers a questionnaire by choosing the sentences that sound like the team in each scenario. Grammarly turns those choices into a tone profile, and writers then see suggestions marking tones as on-brand or off-brand. An admin can limit the hints to a list of sites.
Separately, on Pro and higher, Grammarly builds a personal voice profile from what you write and offers Rewrite in my voice on a selection, in its Windows, Mac and Chrome apps. It isn't a drafting tool for an agent. The free plan has no brand tones. Pro gets one profile and one style guide, and is listed at $12 a month on Grammarly's plans page.
Pick it if your team writes by hand in the browser and you want everyone nudged toward one tone. For a support team answering tickets, that's a better fit than any agent tool here.
5. Jasper Brand Voice
Jasper builds a voice from up to 8 examples: pasted text, .txt, .pdf or .docx files, or a URL it crawls. It writes back a description of your style, lets you switch on excerpts to sharpen it, and shows a preview with and without the voice side by side. An admin can make one voice the default for the whole workspace, so every new piece starts on-brand.
That workspace default is the reason to buy it. Pro includes 2 voices at $69 per seat per month, or $59 billed annually. Business has unlimited voices and adds a style guide with rules such as "use the Oxford comma". Its preview offers a blog post, a LinkedIn post or a product description, which tells you who it's for.
Pick it if you run content for a brand and several people need to sound like the company. If you want your own Slack replies to sound like you, it's the wrong shape.
6. Idiolect
Idiolect is the closest thing to Ownhand on this list: a remote MCP connector, so your agent calls it while drafting. It builds a profile from 3 to 5 examples or a short interview, has a web Studio for drafting outside the agent, and scores drafts from 0 to 100 with Voice Match. The personal plan is free while it's in beta.
Pick it if you want to pay nothing for now, or you want a number that tells you how close a draft is. The detailed comparison is Ownhand vs Idiolect.
7. Ownhand
Ownhand sits between your agent and the send button. The agent drafts as usual, then passes the draft to Ownhand with an occasion such as chat_dm, email_cold or pr_description. There are 12 built in, and each sets length, register, greeting and sign-off. For a reply, the agent passes the thread, and the rewrite matches how you write in that thread: message length, capitals, greetings, sign-offs. A checker confirms that names, dates, numbers and links from the draft survived.
After you send, the agent reports the exact text that went out, and your Hand learns from the gap. The mechanics are in how Ownhand learns from what you send.
The weak spots: it needs an agent or the API, so there's no editor to type into. It has no shared team voice. And it costs money once the free credit runs out.
Pick it if you send Slack DMs, cold emails and PR descriptions through Claude, ChatGPT or Cursor in the same week and want each one to read like you wrote it for that place.
Which one for which person
- A freelancer sending ten client emails a week: a ChatGPT or Claude Project with five sent emails in it. Free, and probably enough.
- A content lead with three writers and one brand: Jasper, for the workspace default voice.
- A support or sales team writing in the browser: Grammarly brand tones.
- A solo writer curious whether a connector helps, with no budget: Idiolect while the beta is free.
- An engineer or founder whose agent drafts Slack replies, emails and PRs all day: Ownhand.
Whatever you pick, the samples matter more than the tool. Use messages you wrote and sent yourself, from the places you actually write, and never AI drafts.
Follow-up questions
Which tool learns my voice from my own writing samples?
Jasper Brand Voice takes up to 8 examples as text, files or URLs. Idiolect starts from 3 to 5 examples or a short interview. Ownhand asks for 5 to 10 things you sent. Claude and ChatGPT Projects let you add samples as files. Grammarly brand tones work differently: you answer a questionnaire by picking sentences that sound right for your team.
Is there a free way to make AI write like me?
Yes. Custom instructions in ChatGPT and instructions in Claude cost nothing on any plan that has them, and both apps have Projects that hold samples. Idiolect's personal plan is also free during its beta. Grammarly's free plan includes no brand tones.
What happened to Claude Styles?
Anthropic folded them into skills. Its help center said custom styles move over as skills that arrive switched off, and the old Styles article no longer loads. The current help center documents instructions, Projects and skills for shaping how Claude writes, so those are what this page covers. More detail is on the Ownhand vs Claude styles page.
Is Ownhand better than Jasper for a marketing team?
Usually not. Jasper lets an admin set one default brand voice for a whole workspace, keeps voices private or shared, and adds a style guide on its Business plan. Ownhand builds one person's Hand and learns from that person's sent messages. It has no shared team voice.
Sources
Checked on 4 October 2026. If something here is out of date, email hi@thalientlabs.ai and we will fix it.
- Jasper Help Center: Brand Voice: up to 8 examples as text, files or URLs; side-by-side preview; default workspace voice set by admins; 2 voices on Pro, unlimited on Business; style guide on Business only
- Jasper: pricing: Pro at $69 per seat per month, or $59 billed annually; Business priced on request
- Jasper: Brand Voice: flags off-brand tone and suggests changes
- Grammarly Support: set brand tones: questionnaire of example sentences, tone suggestions as you write, one profile on Pro, set by admins and managers, site allow list
- Grammarly: plans: Free has no brand tones or style guides; Pro has one of each and is listed at $12 a month
- Grammarly: brand tones for business: tone profiles per team
- Idiolect: pricing: personal plan free during the beta
- Idiolect: Voice Match: 0 to 100 relative score for how close a draft reads to your writing
- moshpit-labs/idiolect-mcp on GitHub: profile from 3 to 5 examples or a guided interview
- Claude Help Center: Claude's personalization features: Instructions for Claude, project instructions, skills; no mention of Styles
- Claude Help Center: Styles are moving to skills (archived copy): custom styles migrate to skills, switched off; the live article returned not found on 4 October 2026
- Grammarly Support: view and customize your voice profile: voice profile from your writing on Pro and higher, Rewrite in my voice, Windows, Mac and Chrome
- Claude Help Center: creating and managing projects: project knowledge files; five projects on free accounts
- Claude Help Center: custom connectors using remote MCP: one custom connector on the free plan
- OpenAI Help Center: ChatGPT custom instructions: 1,500 characters on Free and Go, 5,000 on paid plans
- OpenAI Help Center: Projects in ChatGPT: files and project instructions that override custom instructions
- OpenAI Help Center: Memory in ChatGPT: saved memories and chat history
- OpenAI: ChatGPT developer mode: MCP apps on Plus, Pro, Business, Enterprise and Education, on the web
- Ownhand source code: occasions, reply matching, the checker and the feedback loop