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Personalisation depth: Does the tool use real data about the prospect (company details, role, recent news) or just insert names and generic details?
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Customisation options: Can you set tone, length, and messaging angle before generation?
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Integration with your workflow: Does it work in your email client, CRM, or do you need to copy-paste?
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Learning curve: How long before a team member can use it effectively without training?
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Cost per user: Some tools charge per seat. Does the pricing scale with your team size?
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Output quality: Do the emails read naturally, or do they sound obviously AI-generated?
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Privacy and data handling: Is your prospect data secure? Do they store it? Can you delete it?
The Top Options
ChatGPT Writer
What it does well
ChatGPT Writer sits directly in your browser and email inbox.
You open a new email, click the extension icon, and describe what you want to write. "Write a cold email to a sustainability consultant who recently posted about carbon accounting" and it generates a full email in seconds. The output quality is exceptionally high because you're using GPT-4 (with a paid ChatGPT account) or GPT-3.5 (free tier). You can refine prompts until you get the exact tone and angle you want. The real advantage here is flexibility. You're not limited to what a cold email tool "thinks" is good. You can ask for emails that are funny, serious, technical, or casual. You can ask it to reference specific details you paste in. Over time, you'll develop prompt templates that your team can reuse, creating consistency without feeling templated.
Pricing
Free tier available with GPT-3.5 (slower, less capable). ChatGPT Plus is £20/month per user for GPT-4 access. There's no per-email cost, so unlimited generation.
Best for
Teams that want maximum flexibility and don't mind learning to write better prompts. If your cold email strategy varies significantly (different industries, different value propositions), this gives you the freedom to customise messaging on the fly.
Limitations
Requires manual prompt writing. Your first 10 emails might be hit-or-miss as you refine your approach. No built-in research or prospect data integration. You're not automatically pulling in company details or news. You have to provide that context yourself, which means more work upfront. Also, the extension works best in Gmail. Outlook support exists but isn't as smooth.
ColdConvert AI
What it does well
ColdConvert is built specifically for cold email.
You paste in prospect information (name, company, role, maybe a LinkedIn URL), select your campaign template, and it generates a personalised email in one click. The tool handles the research automatically for some fields. It understands cold email conventions better than a general AI. You can set up multiple campaign templates with different angles (price objection, feature-focused, problem-aware) and switch between them. The strength is speed and consistency. Your entire team can generate on-brand emails without needing to craft prompts. There's less variation in quality because the tool is purpose-built for this specific job.
Pricing
Free tier allows limited generations per month. Paid plans start around £29/month and scale up with higher limits. Some plans charge per email after a threshold.
Best for
Sales teams running multiple concurrent outreach campaigns who want consistency and speed. If you're sending 200+ cold emails per month and want minimal training overhead, this works well.
Limitations
Less flexibility than general AI tools. If you need unusual messaging angles, you're constrained by the available templates. The free tier has meaningful restrictions. For larger teams, costs add up quickly because you pay per user or per email. Personalisation relies on the data you provide, so garbage in means generic emails out. If you don't research prospects thoroughly, the tool can't compensate.
HyperWrite
What it does well
HyperWrite is a writing assistant that works across your entire workflow.
It's not cold email specific, but it handles it well. You can use it to generate emails, refine existing ones, expand bullet points into paragraphs, or shorten rambling text. It integrates into Gmail, LinkedIn, and your browser generally. The "Magic Editor" feature lets you specify tone and style changes. You can also create custom templates and save your best-performing emails as starting points. What makes HyperWrite useful is that it covers your entire sales workflow. Use it for cold emails, then use it for follow-ups, for LinkedIn messages, for proposal sections. It's a Swiss Army knife rather than a specialist tool.
Pricing
Free tier with basic features. Premium is around £96/year (roughly £8/month), which is genuinely affordable. Enterprise pricing available for teams.
Best for
Solo founders and small sales teams where one person is handling multiple writing tasks. If you're writing cold emails, LinkedIn outreach, case studies, and sales collateral, this handles all of it. The yearly pricing is especially good value.
Limitations
Not as cold email specific as ColdConvert. You need to know what to ask it to do. Similar to ChatGPT Writer, you provide the prospect context. No built-in research or CRM integration. It's a writing tool first, not an outreach platform. Also, the interface requires a bit of clicking around compared to tools that live directly in your email.
Prerequisites
Before you start, you'll need: - A Gmail or Outlook account (all three tools work with email)
- A list of prospects with basic details (names, companies, ideally LinkedIn profiles or company websites)
- 15 minutes to install the extension and test it with one email
- No coding required for any of these tools
- Optional but helpful: a CRM or spreadsheet where you track outreach (Pipedrive, HubSpot, Airtable, or even Google Sheets)
- Free tier access is sufficient to start learning which tool fits your workflow
Our Recommendation
Here's the straightforward advice: If you're a solo founder or small team with budget constraints: Use HyperWrite. The annual cost is negligible, and you get a tool that covers all your writing. Start with the free tier, test it thoroughly, then upgrade.
If you're running formal sales campaigns with templates:
Use ColdConvert AI. The purpose-built nature and template system mean less thinking, faster execution, and lower variation. The cost is justified if you're sending 100+ emails monthly. If you want maximum flexibility and are willing to invest time in prompt engineering: Use ChatGPT Writer. This wins if your outreach varies a lot or if you're already paying for ChatGPT Plus. You'll get the highest quality output once you nail your prompts. If you need to pick just one to test, start with ChatGPT Writer. It has the lowest barrier to entry (free tier available, works in Gmail, no additional signup), and you can evaluate whether cold email personalisation actually moves the needle for you before committing to paid tools.
Getting Started
Here's a quick start using ChatGPT Writer:
Step 1: Install the extension
Go to your browser's extension store and search "ChatGPT Writer". Install it. You'll need a free ChatGPT account (sign up at openai.com if you don't have one).
Step 2: Research your first prospect
Pick one prospect to test. Spend two minutes on their LinkedIn or company website. Note: their role, something recent they've shared, one detail about their company.
Step 3: Open a new email in Gmail
Click "Compose". You'll see the ChatGPT Writer icon next to the send button.
Step 4: Click the extension and write your prompt
Something like: "Write a cold email to a marketing manager at a B2B SaaS company. They recently posted about lead generation challenges. Keep it short (under 150 words), friendly tone, and mention that we work with similar companies. Include a soft call to action."
Step 5: Review and send
The email generates in 5-10 seconds. Read it. If it's not quite right, edit it directly or run the prompt again with different instructions. Once you've sent five emails and see the response rate, you'll know whether this approach works for your market. Then expand to your whole list.