Best free AI for grant writing (2026).
The best free AI for grant writing is Grantable's free tier, which is the only no-cost option built specifically for grants — it includes AI funder discovery and drafting. For general drafting, ChatGPT, Claude, and Gemini have capable free tiers, but you supply the research and funder list yourself. Here's how the free options compare.
Published by Grantable. We've kept the comparison honest — including where the free general assistants are genuinely useful.
The best free AI grant writing tools, ranked
1. Grantable (free tier)
Top pickBest free option built specifically for grant work
Grantable's free tier is unusual: it includes AI funder discovery — match your mission against funders drawn from public IRS 990 data across 800,000+ organizations — plus AI drafting tools, at no cost and with no credit card. Most tools that call themselves "free" are time-limited trials. Drafts pull from your own content library and organization profile rather than the open web, so they sound like your org. Paid plans add the full writing workspace from $50/mo, with nonprofit discounts.
2. ChatGPT (free)
Best free general assistant for drafting
OpenAI's free tier is genuinely capable for brainstorming, rewording, and first drafts, and it can work from your own material if you paste or upload it. It has no grant or funder data and no discovery, only limited memory between chats, and it can fabricate statistics or eligibility details — so you supply the research and check every line.
3. Claude (free)
Best free assistant for long documents
Anthropic's free tier handles long, structured writing well and can take a full RFP plus a past proposal in one go. Like ChatGPT, it has no funder data or discovery and doesn't retain a grant-specific profile of your organization — a strong general writer, not a grant platform.
4. Google Gemini (free)
Best free assistant if you live in Google Workspace
Useful free general AI, convenient if your proposals already live in Google Docs. Same limitations for grants specifically: no funder database and no mission-alignment scoring out of the box.
What "free" really means
"Free" hides three different things. A free trial gives you full access for a set number of days, then asks for a card — most funder-discovery tools work this way. A free tier is an ongoing plan with usage or feature limits but no expiry. A free general assistant (ChatGPT, Claude, Gemini) is fully free but not built for grants — the work of finding funders and supplying facts falls to you.
For grant writing specifically, the question that matters is whether the free option includes funder data. General assistants don't. A purpose-built free tier like Grantable's does — which is why it's the strongest free starting point for nonprofits that need to find funders, not just draft text.
Grant-built free tier vs. general AI
| Capability (free tiers) | Grantable | General AI |
|---|---|---|
| Free to use | ||
| Built specifically for grants | ||
| 990-based funder discovery | ||
| Drafts from your own content | Limited | |
| AI funder fit-scoring | ||
| Remembers your organization | Limited |
"Limited" means a partial or manual version of the capability. Comparison based on publicly available information as of 2026; verify current details with each provider.
Frequently asked questions
Is there a truly free AI tool for grant writing?
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Yes. Grantable offers a free tier that is purpose-built for grants — it includes AI funder discovery and drafting at no cost, without a time limit. General assistants like ChatGPT, Claude, and Gemini also have free tiers, but they are not grant-specific and have no funder data.
Can I write a grant with free ChatGPT?
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You can draft sections of a grant with free ChatGPT, especially if you give it your own research and content to work from. But it won't find funders for you, doesn't retain your organization's details reliably between sessions, and can invent figures — so plan to supply the facts and verify everything.
Is Grantable actually free, or just a free trial?
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Grantable's free tier is an ongoing free plan, not a countdown trial — it includes AI funder discovery and drafting. Paid plans (from $50/mo, with nonprofit discounts) unlock the full writing workspace, but you can do real work without paying.
What is the catch with free AI grant tools?
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With general AI (ChatGPT, Claude, Gemini), the catch is that you do the grant-specific work yourself — finding funders, supplying organizational facts, and fact-checking output. With purpose-built free tiers like Grantable's, the limits are usage and advanced workspace features rather than access to the core funder data.
Start free — and actually find funders.
Paste your website and Grantable's free tier matches you to aligned funders in about 60 seconds. No credit card.