How to choose an AI writing assistant for a solo blog (buying framework)

This guide compares seven AI writing tools that solo bloggers ask about constantly: ChatGPT, Claude, the Gemini app, Microsoft Copilot, Notion AI, Grammarly and Jasper. Honesty note first: we don't run paid tool trials on a zero budget, so we make no 'we tested it' benchmarks. Every factual statement points to the vendor's own page (see Sources) with an access date, and we quote no exact prices or numeric limits that we could not verify at source the same day — pricing pages render differently by region, so treat the live page as the single source of truth.

The real difference is workflow shape, not model quality

General-purpose assistants (ChatGPT, Claude, Gemini, Copilot) generate text from a blank box. Writing enhancers (Grammarly) attach to the text you already wrote everywhere you type. Workspace AIs (Notion AI) live inside the app where your content calendar and drafts already live. Marketing suites (Jasper) add brand voice, templates and campaign workflows on top of generation. Picking 'the best model' is the wrong question — the right one is: where does my writing actually happen, and what fraction of the job do I want automated?

Where each one tends to fit

• ChatGPT (OpenAI) — a general assistant advertised with a free tier and paid upgrades; commonly used to draft, outline, rewrite and brainstorm whole posts from prompts.
• Claude (Anthropic) — positioned as an assistant for writing, analysis and reasoning; a frequent pick for long-form drafts and tone-matching edits.
• Gemini app (Google) — Google's assistant, integrated with Google accounts and Workspace apps; natural fit if your blog lives in Docs/Gmail.
• Microsoft Copilot — Microsoft's assistant, embedded across Windows, Edge and Microsoft 365 apps; natural fit if Word is where you draft.
• Notion AI — sold as an add-on around Notion workspaces, with generative and autofill capabilities stated on the vendor's own pricing page; fits bloggers who keep planning, drafts and CMS notes inside Notion.
• Grammarly — an editor-first tool: the free plan is described on its own pricing page as covering spelling and grammar mistakes with a stated allowance of AI prompts per month, while rewrites and tone adjustment sit in paid plans.
• Jasper — a marketing-content platform rather than a chat assistant: brand voice, campaigns and templates, aimed at teams producing on-brand content at volume.

Five criteria that actually decide fit for one person

1. Draft vs. polish — do you need text created (assistant/Jasper) or your own text improved (Grammarly)? Some blogs need one, some need both.
2. Where it lives — a browser tab you switch to, an overlay in every app, or built into the workspace you already open daily. Context-switching is the silent killer of solo-blogger consistency.
3. Free-tier shape — what you can genuinely publish from a free plan before upgrading, checked on the vendor's own page (prompt caps and feature gates move often).
4. Privacy and data controls — whether your drafts can be excluded from training, and what the vendor's policy page says; bloggers publishing original research care about this more than most.
5. Output you can make yours — general assistants need prompting to match your voice; brand-voice tools claim to do it for you. Either way, edit before publishing.

How to read the comparison below

A 30-minute way to decide

1. Take one real post you've been avoiding and draft it in the free tier of one general assistant (any of the four big ones).
2. Paste your draft into Grammarly's free tier and see how much it catches — that tells you if you need an editor layer.
3. If you plan content in Notion or Word, try the built-in AI there before buying a separate subscription.
4. Only consider a dedicated marketing suite like Jasper once volume (many posts/campaigns per week, or a team) is the bottleneck rather than ideas or writing.

What to avoid

• Publishing raw AI output — search systems and readers reward a distinct human angle; use AI for structure and drafts, then rewrite in your voice.
• Subscribing to two general assistants 'for comparison' — they overlap heavily; one assistant plus one editor covers most solo bloggers.
• Trusting remembered prices — free-tier limits and plan names change; always re-open the vendor page linked in Sources before deciding.

If you're also picking tools for the rest of your stack, our guide to choosing a CRM for a two-person team uses the same criteria-first approach, and the email-marketing shortlist covers the next decision most solo bloggers hit.