“AI writing assistant” covers four genuinely different products now: brand-voice marketing generators, chat-based copywriting workflows, an editing layer that sits on top of anything you type, and general-purpose chatbots pressed into writing duty. We compared Jasper, Copy.ai, Grammarly, and ChatGPT Plus on what they’re actually built for and what each one costs.
At a Glance
| Tool | Price | Free Plan | Best For |
|---|---|---|---|
| Jasper | Pro: $69/seat/mo billed monthly or $59/seat/mo billed yearly; Business: custom pricing | No — 7-day free trial only | Marketing teams needing brand-voice-consistent content at scale |
| Copy.ai | Chat: $29/mo billed monthly or $24/mo billed yearly (5 seats); Growth: $1,000/mo+ (75 seats) | No — trial only | Teams wanting multi-model (OpenAI/Anthropic/Gemini) chat copywriting with workflow automation |
| Grammarly | Free: $0; Pro: $30/mo billed monthly or $12/mo billed yearly ($144/yr) | Yes — 100 AI prompts/month plus grammar & tone checks | Everyday writers who want an editing layer on top of anything they write |
| ChatGPT Plus | Plus: $20/month; Pro: usage-based tiers (no single published flat price) | Yes — capable free tier with usage limits | General-purpose writing, research, and brainstorming at the lowest cost per capability |
A note on ChatGPT Pro: OpenAI’s current pricing page lists Pro as offering “a choice of 3 usage tiers” rather than one flat monthly price, and different usage tiers come with different costs. We’re not publishing a specific Pro dollar figure here because OpenAI’s own page doesn’t display one in a simple, single-number form — check chatgpt.com/pricing directly for current tier pricing if Pro is what you need.
Short Verdict
These four tools solve different problems well enough that “which is best” depends entirely on the job. Jasper and Copy.ai are both built for teams producing marketing content at volume with brand consistency and workflow automation — Jasper leans more toward a structured brand-voice/agent system, Copy.ai toward flexible multi-model chat and no-code workflows. Neither has a real free plan. Grammarly is the cheapest and most broadly useful for anyone who writes anything, because it layers onto existing writing rather than generating from scratch, and its free tier is genuinely usable. ChatGPT Plus is the best value if you need general-purpose AI writing help and don’t need marketing-specific brand controls or workflow automation — $20/month buys a capable all-purpose assistant that can draft, edit, and research.
Jasper: Best for Brand-Consistent Marketing Content
Jasper’s Pro plan runs $69/seat/month billed monthly, or $59/seat/month billed yearly with a 12-month commitment (both include a 7-day free trial). Pro covers one seat, the Canvas platform for on-brand content creation, agents for core marketing workflows, 2 Brand Voices, 5 Knowledge assets, and 3 Audiences. Business is custom-priced, requires a 12-month commitment and a sales conversation, and adds agents for more complex workflows (including GEO and translations), a no-code builder for custom AI agents, Jasper Grid for scaled content execution, unlimited Brand Voices/Knowledge/Audiences, API access, and enterprise admin controls. Some Business-tier features run on a separate credit system rather than being unlimited. There’s no permanent free plan — just the 7-day trial on Pro.
Copy.ai: Best for Multi-Model Chat Workflows
Copy.ai’s entry plan, Chat, costs $29/month billed monthly or $24/month billed annually ($288/year), covers 5 seats, and gives unlimited words and unlimited chat projects with access to OpenAI, Anthropic, and Gemini models in one interface. Above that, pricing jumps steeply into team-workflow territory: Growth is $1,000/month (75 seats, 20,000 workflow credits/month), Expansion is $2,000/month (150 seats), and Scale is $3,000/month (200 seats), with Enterprise above that at custom pricing. The gap between Chat and Growth is large enough that Copy.ai is really two different products: an affordable multi-model chat tool for small teams, and a workflow-automation platform priced for larger marketing operations. There’s no free plan, only a free trial.
Grammarly: Best Free Plan and Everyday Value
Grammarly’s Free plan costs $0 and includes 100 AI prompts per month plus its long-standing grammar, spelling, and tone-detection checks — a genuinely usable starting point, not a stripped teaser. Pro costs $30/month billed monthly, or $12/month billed annually ($144/year), and raises the AI prompt allowance to 2,000 per member per month while adding tone adjustment, full-sentence rewrites, inclusive-language suggestions, citation consistency, and both AI-generated-text and accidental-plagiarism detection. Enterprise is contact-sales pricing with unlimited AI prompts per member. Grammarly’s current lineup collapsed its old “Premium” and “Business” tiers into Pro, per its own FAQ. Of the four tools here, Grammarly is the only one built primarily to edit and improve writing you’ve already drafted, rather than to generate content from a prompt.
ChatGPT Plus: Best General-Purpose Value
ChatGPT’s Free tier costs $0 and includes unlimited text chats (subject to abuse guardrails) with limited access to uploads, image creation, voice, deep research, and memory. Plus costs $20/month and expands all of those limits, adds advanced reasoning models, projects, scheduled tasks, custom GPTs, and broader Codex and ChatGPT Work access across desktop, web, and mobile. Pro sits above Plus with a choice of usage tiers rather than one flat price, Pro-specific reasoning models, longer session limits, and an always-on agent feature OpenAI calls Dot. As a pure writing tool, ChatGPT lacks Jasper’s or Copy.ai’s brand-voice and workflow-automation features, but at $20/month for Plus, it’s the cheapest way to get a genuinely capable AI writing and research assistant with no marketing-specific overhead.
Pros and Cons by Tool
- Jasper — Pro: structured brand-voice controls built for marketing teams. Con: no free plan, and per-seat pricing adds up for larger teams.
- Copy.ai — Pro: access to multiple AI models in one subscription at a low entry price. Con: pricing jumps dramatically once you need more than 5 seats or real workflow automation.
- Grammarly — Pro: the only genuinely useful free tier of the four, and the cheapest paid tier billed annually. Con: it edits and polishes rather than generating long-form content from scratch.
- ChatGPT Plus — Pro: the best all-purpose capability per dollar, and a usable free tier to start. Con: no brand-voice memory, templates, or marketing-specific workflow tools built in.
Bottom Line
Pick based on the job, not the hype: Jasper or Copy.ai if you’re producing marketing content at volume and need brand consistency or workflow automation (Jasper for structured brand controls, Copy.ai for flexible multi-model chat at a lower entry price); Grammarly if you want a free or cheap editing layer on top of writing you’re already doing; ChatGPT Plus if you want one general-purpose assistant for drafting, research, and brainstorming at the lowest monthly cost.
Sources
- Jasper — Official pricing page
- Copy.ai — Official pricing page
- Grammarly — Official pricing page
- ChatGPT — Official pricing page (OpenAI)
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