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Cold Outreach Email Test — Claude Pro vs ChatGPT vs Writesonic
We gave three AI writing tools the same cold outreach brief — a UK freelance content writer contacting a SaaS company whose blog has gone quiet. Same prompt, same constraints, no editing. Here’s what each tool produced.
Claude Pro
Full review →ChatGPT
This is the most natural and human-sounding email. It’s simple, grounded, and avoids trying too hard to impress. The value proposition is clear without over-claiming, and the offer (sending 3 ideas) feels realistic and low commitment. It lacks a bit of punch compared to Claude, but it’s probably the safest, most universally usable option.
Writesonic
Full review →Writesonic goes big — three variations, each with a distinct angle (problem-solution, competitive, opportunity). That range is genuinely useful. However, the inclusion of specific stats and case studies feels a bit generic and potentially fabricated, which could reduce trust. Variation 1 is the strongest overall; the others lean slightly salesy. Still, the breadth of approaches is impressive and gives you options depending on style.
Writesonic takes this one. While Claude Pro and ChatGPT both produced strong, sendable emails, Writesonic’s ability to generate three distinct and strategically different variations from a single prompt makes it the most useful in practice. Instead of one solid option, you get multiple angles to test or refine — and that flexibility wins here.
Full reviews
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Feels the most polished and “agency-like” of the three. It’s confident, structured, and easy to read, with a clear narrative around the problem and stakes. The tone is slightly elevated, which makes it credible but a touch less personal. The “article on spec” offer stands out as a strong, low-friction hook. Definitely sendable with minimal edits.