Can AI Write Your Cover Letter? We Tested 5 Tools

We tested 5 AI cover letter generators on real job applications. Here are the honest results — and which one actually produced letters worth sending.

Can AI Write Your Cover Letter? We Tested 5 Tools

Short answer: yes — but some AI cover letters are dramatically better than others. We tested five tools on the same job posting to find out.

The Test

**Job:** Senior Product Manager at a Series B SaaS startup

**Input:** Same resume plus same job description fed to all tools

**Criteria:** Personalisation, tone, specificity, length, and would a human write this?

Tool 1: Kickresume AI — Winner

Kickresume's GPT-4-powered generator produced the most personalised output. It identified the startup's growth stage, matched tone to the company's vibe, and wrote a compelling opening line.

**Score: 9/10** — Ready to send with minor tweaks.

Tool 2: Resume.io Cover Letter Builder — Runner Up

Clean, professional output. A bit more formal than ideal for a startup, but structurally solid. The AI filled in relevant experience points accurately from the resume.

**Score: 7.5/10** — Good but generic in places.

Tool 3: ChatGPT (GPT-4) — Most Flexible

With the right prompt, ChatGPT produced the most creative and specific output of all tools. But it required 3 rounds of iteration. If you know how to prompt, this is the most powerful option.

Sample prompt: "Write a cover letter for this PM role at a Series B startup. Tone: direct and confident, not formal. Max 3 paragraphs. Start with a hook. Job: [paste]. Resume: [paste]."

Score: 8.5/10 with good prompting

Tool 4: Rezi AI Cover Letter — Middle of the Pack

Rezi generated a technically correct cover letter but it felt robotic. Heavy on generic phrases like "results-driven professional."

**Score: 6/10** — Needs significant editing.

Tool 5: LinkedIn AI Cover Letter — Most Disappointing

LinkedIn's built-in AI produced a generic 4-paragraph template that could apply to any job. No customisation despite having access to both the job posting and your profile.

**Score: 4/10** — Skip this.

What Makes a Great AI Cover Letter

**Specific hook** — Reference something real about the company

**One achievement** — A metric from your experience relevant to their pain

**Direct ask** — End with confidence, not desperation

**Short** — 3 paragraphs max. Hiring managers do not read essays.

Verdict

For pure ease: **Kickresume AI**. For best possible output: **ChatGPT with a good prompt**. Avoid LinkedIn's built-in tool entirely.

AI-written cover letters only work if you personalise the output. Treat AI as a first draft, not a finished product.

Can AI Write Your Cover Letter? We Tested 5 Tools