Writing personalised cold emails at scale is the holy grail of sales outreach. You want every prospect to feel like you've researched them individually, yet you also want to send hundreds of emails without losing your mind to repetitive work. The problem? Most email templates feel generic, AI-generated copy often sounds robotic, and manually customising each message is simply not realistic for growing sales teams. This is where AI email writing tools come in. Three contenders have gained traction: ChatGPT Writer, ColdConvert AI, and HyperWrite. Each promises to save time and improve email quality, but they approach the problem differently. Let's find out which one actually delivers the personalised, scalable cold email solution your sales team needs.
Quick Comparison Table
| Tool | Best For | Pricing | Key Strength | Key Weakness |
|---|---|---|---|---|
| ColdConvert AI | Sales teams focused on cold outreach | Freemium | Purpose-built for cold emails with built-in personalisation | Limited to email use case |
| ChatGPT Writer | General writing across multiple channels | Freemium | Flexible, generates content for any scenario | Requires more manual customisation for personalisation |
| HyperWrite | Sales and marketing professionals writing multiple content types | Freemium | Fast iteration and polishing across different formats | Less specialised for cold email specifically |
Head-to-Head Breakdown
ColdConvert AI
What it does
ColdConvert AI is purpose-built for generating personalised cold emails instantly.
You input prospect information (name, company, role, recent company news), and the tool generates a customised email that references specific details. It's designed with the cold outreach workflow in mind, meaning fewer steps between research and send. Strengths - Generates emails tailored to individual prospects automatically - Includes placeholders for company-specific information and recent news hooks - Specifically designed for cold outreach, so the copy style matches sales best practices - Fast turnaround on email generation - Free tier includes meaningful email credits Weaknesses - Limited to email generation, so it won't help with other sales documents - Customisation options might feel restrictive if you need highly specific tone adjustments - Relies on you having prospect information readily available for personalisation to work well - Smaller user base means fewer community resources and templates compared to ChatGPT
Pricing
ColdConvert AI operates on a freemium model. The free tier gives you a limited number of email generations per month, enough to test the tool and send a small campaign. Paid plans enable higher volume generation, making it cost-effective for teams sending dozens or hundreds of emails weekly.
Best for
Sales development representatives and outbound sales leaders who focus specifically on cold outreach and want to personalise at scale without writing each email manually. ---
ChatGPT Writer
What it does
ChatGPT Writer is a browser extension that brings ChatGPT's capabilities into any text field.
You can generate, edit, or rewrite emails, messages, social posts, and other content directly where you're typing. It's flexible enough to handle any writing scenario, from cold emails to follow-ups to LinkedIn messages. Strengths - Works anywhere you type, from Gmail to LinkedIn to Slack - Incredibly flexible; you can write emails, articles, social content, or anything else - Uses the powerful ChatGPT-4 model, so output quality is high - You retain full control over the prompt, allowing detailed customisation - Large community means plenty of examples and prompt templates available online Weaknesses - Requires you to write detailed prompts to achieve good personalisation; it doesn't automate the research-to-email process - Not optimised for cold email specifically, so you'll need to guide it with specific instructions each time - Takes more steps than a purpose-built tool (open extension, write prompt, generate, refine) - Quality depends heavily on your ability to write good prompts - Can generate overly long or verbose copy if not guided carefully
Pricing
ChatGPT Writer is freemium. The free tier uses ChatGPT-3.5 and allows a reasonable number of requests. Paid plans enable access to ChatGPT-4 and higher usage limits. If you're already paying for ChatGPT Plus, ChatGPT Writer integrates smoothly.
Best for
Sales professionals who write multiple types of content beyond emails and want flexibility over speed. Also suited to those comfortable writing detailed prompts to guide AI output. ---
HyperWrite
What it does
HyperWrite is an AI writing assistant designed to help you write faster from idea to final draft.
It includes tools for generating copy, rewriting existing text, answering questions, and checking your work. Like ChatGPT Writer, it works as a browser extension and integrates into your writing environment. Strengths - Fast and responsive; feels snappy compared to some alternatives - Good for polishing and refining existing copy, not just generating from scratch - Multiple writing modes (generate, rewrite, improve, answer questions) give you flexibility - Works across the web in any text field - User interface is clean and intuitive Weaknesses - Not specialised for cold email, so you won't get industry-specific copy patterns - Requires you to prompt it effectively, similar to ChatGPT Writer - Smaller community compared to ChatGPT, so fewer templates and examples online - Free tier is more limited than competitors - Less clear focus means it does many things adequately but excels at none
Pricing
HyperWrite operates on a freemium model with a tighter free tier than ChatGPT Writer. The paid plan enables more generations and priority access. Pricing is competitive but you get fewer features than ChatGPT Plus for similar cost.
Best for
Marketing and sales professionals who need to write multiple types of content quickly and value a polished user experience. Less ideal if cold email is your primary use case. ---
Feature Comparison Table
| Feature | ColdConvert AI | ChatGPT Writer | HyperWrite |
|---|---|---|---|
| Cold email generation | Yes, specialised | Yes, but requires prompting | Yes, but generic |
| Personalisation automation | Built-in for prospect data | Manual, prompt-dependent | Manual, prompt-dependent |
| Works in Gmail | Yes | Yes | Yes |
| Works on LinkedIn | No | Yes | Yes |
| Generates other content types | No | Yes | Yes |
| Browser extension | Yes | Yes | Yes |
| Free tier quality | High (cold email focused) | High (ChatGPT-3.5) | Good (basic) |
| Customisation flexibility | Moderate | Very high | Moderate |
| Learning curve | Low | Medium | Low |
| Community resources | Small | Very large | Small |
Prerequisites
Before testing these tools, you'll need a few things in place: - A Gmail or web-based email account to test email generation within your actual workflow - Basic prospect research (company name, role, recent news) ready to feed into tools like ColdConvert AI for best results - Free accounts with each tool to evaluate the free tier; no credit card required for any of them - A Chrome or Firefox browser to use browser extensions - About 30 minutes to test each tool with 3-5 real prospect emails so you can judge output quality fairly - No technical knowledge required; all three tools have straightforward, user-friendly interfaces ---
The Verdict
Best for beginners:
ColdConvert AI
If you're new to AI email writing and want something that works immediately without learning prompt engineering, ColdConvert AI is your answer. It's designed specifically for your use case, which means less thinking and faster results. You input prospect data, get a personalised email, and move on.
Best value: ChatGPT Writer
If you already subscribe to ChatGPT Plus, ChatGPT Writer costs nothing extra and gives you the most flexible tool available. You'll spend more time crafting prompts, but you'll also gain a writing assistant that helps with emails, LinkedIn messages, website copy, and anything else. The value compounds once you learn how to prompt effectively.
Best for teams: ColdConvert AI
When multiple team members need to generate cold emails consistently, ColdConvert AI's standardised approach wins. Everyone gets similar output quality, the process is repeatable, and onboarding new reps is faster. There's less room for error than asking everyone to write detailed ChatGPT prompts.
Best overall: ColdConvert AI
For most sales teams focused on cold outreach, ColdConvert AI delivers the best balance of ease, specialisation, and results. It solves the specific problem (personalised cold emails at scale) without unnecessary complexity. If you need to write varied content types, ChatGPT Writer becomes competitive, but for pure cold email automation, ColdConvert AI pulls ahead. The real question is what matters most to your workflow. Are you sending cold emails and little else? ColdConvert AI. Do you write emails, messages, and other copy daily? ChatGPT Writer. Want something fast and straightforward without overthinking? Either ColdConvert AI or HyperWrite will serve you well.