90% of content marketers now use AI writing tools, up from 30% in 2022. For UK businesses, the question is no longer whether to use AI for writing – it is which tool matches your workflow and budget without creating more problems than it solves.
The market splits into two categories: writing assistants that improve what you write (grammar, tone, clarity) and content generators that write for you (blog posts, ad copy, product descriptions). Choosing the wrong category wastes money. This guide covers both, with UK pricing and honest assessments of what each tool can and cannot do.
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- Grammarly offers a free tier plus paid plans at £12-24/month - 40M+ users worldwide, works across every platform and browser for grammar, tone, and clarity checks
- Jasper costs £47-55/seat/month for marketing teams - best for brand-voice content at scale, with 50+ templates and team collaboration features built in
- Copy.ai at £19/month handles short-form marketing content - ad copy, social posts, and email subject lines with 90+ copywriting templates and a free plan for testing
- Surfer SEO at £70/month combines AI writing with real-time optimisation - the only tool that scores content against SERP competitors while you write, reducing editing cycles by 40-60%
- Start with Grammarly’s free tier before committing to paid tools - test on real workflows first, then add a specialist tool based on your biggest content bottleneck
AI Writing Tools Compared: Pricing and Features
These five platforms represent distinct approaches to AI writing. Each targets a different use case – choosing the right one depends on whether you need a writing assistant, a content generator, or an SEO optimisation platform.
| Tool | Type | From (GBP approx.) | Best For | AI Model |
|---|---|---|---|---|
| Grammarly | Writing assistant | Free / £12/mo | Grammar, tone, clarity – works in every app | Proprietary NLP |
| Jasper | Content platform | £47/seat/mo | Marketing teams, brand voice, campaigns | Multi-LLM (GPT-4, Claude) |
| Copy.ai | Content generator | £19/mo | Ad copy, social posts, short-form content | GPT-4 based |
| Writesonic | SEO content | £31/mo | Blog posts, product descriptions, bulk content | GPT-4 based |
| Surfer SEO | SEO writing + optimisation | £70/mo | SEO-optimised content with NLP scoring | Surfer AI (GPT-based) |
Grammarly: Best Writing Assistant
Grammarly is the most widely used writing tool in the world – 40 million users across individuals, businesses, and enterprises. It works as a browser extension, desktop app, and mobile keyboard, checking grammar, spelling, tone, and clarity in real time across virtually every platform you write in.
The free tier covers basic grammar and spelling – genuinely useful and unlimited. Pro ($12/month annual) adds full-paragraph rewrites, 1,000 AI prompts per month, plagiarism checking, and advanced tone adjustments. Business ($33/seat/month annual) adds brand tone customisation, style guides, and team analytics.
Grammarly is not a content generator. It improves what you write rather than writing for you. For UK businesses, this makes it the safest AI writing investment – it enhances every team member’s writing without the quality risks of fully AI-generated content. Grammarly holds SOC 2 Type 2, ISO 27001, and ISO 27018 certifications. Data is hosted in the US (AWS).
Jasper: Best for Marketing Teams
Jasper is the enterprise AI content platform, designed for marketing teams that need to produce brand-consistent content at scale. Unlike general-purpose chatbots, Jasper maintains your brand voice across all outputs, supports campaign workflows, and includes purpose-built marketing apps for ads, social posts, landing pages, and email sequences.
Pricing starts at $59/seat/month (approximately £47) on annual billing for the Pro plan, which includes 2 brand voices, image generation, and 30+ language support. The Business plan (custom pricing, 12-month minimum) adds unlimited brand voices, API access, marketing agents, and SSO. A 7-day free trial gives full Pro access.
Jasper’s strength is consistency and scale – a 10-person marketing team can produce content that sounds like the same brand voice wrote everything. The weakness is cost: at £47/seat/month, a small team’s annual spend easily exceeds £5,000. Jasper makes financial sense only when content volume justifies the per-seat investment.
Copy.ai: Best Free Option
Copy.ai was previously known for its generous free tier, but has pivoted toward paid enterprise workflows. The entry-level plan starts at $24/month (approximately £19) on annual billing. The platform excels at short-form content: ad headlines, social media posts, product descriptions, and email subject lines.
Paid plans start at $24/month (approximately £19) on annual billing. The platform has pivoted toward enterprise workflows, with a significant jump to $1,000/month for the Growth plan – making the entry tier the only practical option for UK SMEs.
For UK SMEs that need occasional AI-generated copy without a monthly subscription, Copy.ai’s free tier is the practical starting point. The limitation is long-form content – Copy.ai produces better headlines than it does 2,000-word blog posts.
Writesonic: Best for SEO Blog Content
Writesonic positions itself as the AI tool for SEO content at scale. Its Article Writer generates long-form blog posts with keyword optimisation, and the bulk generation feature can produce dozens of product descriptions or landing pages from a spreadsheet of inputs.
Pricing starts at $39/month (approximately £31) on annual billing for the Lite plan. The Professional plan ($249/month, approximately £197) adds more articles and priority support. All plans include access to Writesonic’s Chatsonic (conversational AI) and Botsonic (custom chatbot builder).
The affiliate program pays 30% lifetime recurring commission – one of the most generous in the AI tools space. Content quality is adequate for first drafts but typically requires significant human editing for UK audiences, particularly around pricing, terminology, and tone.
Surfer SEO: Best for SEO Optimisation
Surfer SEO is not strictly a writing tool – it is an SEO content optimisation platform that includes AI writing. The core value is real-time NLP scoring that tells you exactly which terms, questions, and topics to include for your target keyword, based on analysis of the top-ranking pages.
The Essential plan starts at $89/month (approximately £70) with 30 articles per month and 200 AI-generated articles per year. The Scale plan ($129/month, approximately £102) adds 100 articles per month and is designed for content teams and agencies.
For UK businesses serious about SEO content, Surfer’s combination of AI writing with data-driven optimisation produces better-ranking content than any pure AI writing tool. The trade-off is price – Surfer costs more than most AI writing tools and is only valuable if organic search traffic is a business priority.
How to Choose the Right AI Writing Tool
| If You Need | Choose | Monthly Cost |
|---|---|---|
| Better grammar and tone across all writing | Grammarly Free | £0 |
| AI rewrites + plagiarism checking | Grammarly Pro | £12 |
| Brand-consistent marketing content at scale | Jasper Pro | £47/seat |
| Quick ad copy and social posts | Copy.ai | £19/mo |
| SEO blog posts in bulk | Writesonic | £31 |
| SEO-optimised content with ranking data | Surfer SEO | £70 |
For most UK businesses, the recommended path is: start with Grammarly Free (covers 80% of writing improvement needs), add a general-purpose AI assistant like ChatGPT or Claude for content drafting (£16/month), and only invest in specialist tools like Jasper or Surfer when content volume or SEO requirements justify the cost.
For a broader view of AI tools across every business category, see our best AI tools for business UK guide. For automation tools that can streamline your content workflow, see our Zapier and Make reviews.
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