Independent · Standardized tests · No sponsored scores
AI writing tools, actually tested.
Most AI tool reviews are rewritten press releases. We do it differently: every tool gets the same five-part test suite — same briefs, same prompts, same rubric — and we publish what came out, including the embarrassing parts. Then we score it. That number is the Truth Score.
The top three right now
From our full leaderboard of 9 tested tools. Last re-test: July 2026.
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The best prose quality we've measured. Drafts need the least editing of anything we tested, and it holds a brand voice without drifting into marketing-speak.
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The default for a reason. Fast, versatile, and the free tier is genuinely usable. Its house style needs firm prompting to suppress, but the ceiling is high.
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The only specialist tool on this list that beats the generalists at its own game. For fiction — and only fiction — it's the strongest product we've tested.
Latest verdicts
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Jasper review
7.0Polished marketing copy machine with a price problem. Good output, weak fact-checking, and you can get 80% of it for $20 elsewhere.
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The SEO-article angle is real and the live web research helps, but output quality swings hard depending on which model you pick under the hood.
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Copy.ai review
6.4Pivoted from copywriting app to "GTM AI platform." The workflows are clever; the actual writing is now the weakest part of the product.
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Rytr review
5.9$9 a month is genuinely cheap, and the output reads like it. Fine for short snippets. Do not ship its long-form drafts without a heavy rewrite.
Also tested: Jasper vs Copy.ai and ChatGPT vs Jasper head-to-head, plus our roundup of Jasper alternatives for people eyeing that $49/month invoice.
How we test
Every tool on this site went through the same five tasks: a 1,200-word blog post from a fixed brief, a set of product descriptions, a five-email sequence, a factual-accuracy trap on a topic riddled with common misconceptions, and a brand-voice imitation exercise. We score four things — output quality, factual reliability, editing burden, and value — and the weighted average becomes the Truth Score.
We publish the brief. We publish the rubric. If a tool flubbed a test, we quote the flub. Read the full protocol on the methodology page.
Deep Truth is run by Dan Mercer, who spent five years buying these tools for agency client work before publishing the internal testing that decided those purchases.