The Best AI Grant Writing Tools in 2026, Compared

Last reviewed: September 24, 2026 · Pricing checked: September 24, 2026 · Hands-on drafting test: not yet run (see method) · Change log

Disclosure: we make Grantable, and it’s one of the ten tools below. That’s a reason to be skeptical of this page. So here’s what we did to earn your trust: every tool gets the same five criteria, prices come from each vendor’s own pricing page on a stated date, and every tool, Grantable included, gets a “Limitations” list. Nobody paid to be included.

Short answer: if you write a few proposals a year and you’re a strong writer, a $20/month general assistant (ChatGPT, Claude or Gemini) is enough. If you’re running a pipeline of grants with a team, a grant-specific tool that keeps your organization’s context and funder research in one place saves the most time. Which one depends on whether you need discovery, drafting, or both.

How we compared these tools

What we did. On September 24, 2026 we reviewed each tool’s official pricing and product pages and recorded what each plan includes. We compared the tools on the five criteria below using only what the vendor documents publicly. We didn’t sign up for accounts to do it. For Grantable, we checked every claim against the product’s source code on the same day, because that’s the only way to be sure it’s accurate.

What we didn’t do. We haven’t run a controlled test where every tool drafts the same proposal section and reviewers score the results. So this page has no quality scores, and it doesn’t rank tools on how well they write. A version of this comparison published in March 2026 did report scores from a test like that, but that test was never actually run. We retracted it in April, and it now redirects here. When we do run a real test, the protocol, the prompts, the reviewers and the raw outputs will be published alongside the scores.

The five criteria:

1. Built for grants. Does the tool understand proposal structure, RFPs and funders, or is it a general writer?
2. Remembers your organization. Does your mission, program data and past work carry over between sessions, or do you paste it in every time?
3. Funder and opportunity data. Can it help you find and research funders, or only write?
4. RFP and requirements support. Can it pull requirements out of a solicitation and help you check a draft against them?
5. Cost for a team. Price per user or per workspace, what the free plan really includes, and nonprofit discounts.

Who this is for. Nonprofit development staff, freelance and agency grant writers, and research offices choosing an AI tool for proposal work. We left out pure grant databases with no AI writing features (Candid’s Foundation Directory, GrantStation) and editing-only tools like Grammarly.

The comparison at a glance

All prices are list prices in USD per month, as shown on each vendor’s pricing page on September 24, 2026, unless noted. “Per user” means each team member needs a seat.

“Remembers your org” and “RFP requirements” describe what the product is documented to do, not how well it does it. See how we compared.

Grant-specific tools

Grantable

What it is: an AI workspace for the whole grant cycle: funder research, proposal drafting, and a pipeline of every application. We build it.

Strengths (checked against our product code on September 24, 2026):

• Your organization’s profile goes into every chat. Your organization profile (mission, programs, key facts) is read by the AI at the start of every chat, so you don’t re-explain your organization. The AI can also search the files you’ve uploaded (past proposals, reports, boilerplate) and cite what it used.
• Funder research in the same place you write. Funder search is built from IRS Form 990 data and past grant history, and each match gets an AI fit score. Federal opportunities from Grants.gov are searchable too.
• RFP to checklist. The Grant Writing skill pulls requirements out of the solicitation into a checklist you can work down, and a federal compliance lookup is available in every chat.
• A real document workflow. A rich-text editor with version history, inline comments and @mentions, workspace roles (Admin, Editor, Commenter, Viewer), and DOCX/PDF export. There’s a pipeline dashboard with kanban, list and calendar views of due dates and statuses.
• Priced per workspace, not per seat. Paid plans are $50/month (Starter) and $150/month (Pro), or about 17% less billed annually, and they cover your whole team. Nonprofits with budgets under $500K get 50% off for the first year (pricing).

Limitations:

• No budget or financial tools. Grantable doesn’t build budgets, track expenses or produce financial reports for awarded grants. You’ll still need a spreadsheet or your accounting system for that.
• No direct submission. You can’t submit to Grants.gov or funder portals from Grantable. You export and submit yourself.
• No live co-editing. Teammates can comment and take turns editing, with version history, but two people can’t type in the same document at the same time the way they can in Google Docs.
• Cloud drives are import-only. You can bring files in from Google Drive, Dropbox, OneDrive and Box, but edits don’t sync back. There’s no Word or Google Docs add-in.
• Only the profile is always loaded. Past proposals are found by search, not held in memory, so clear file names and a well-kept profile make a real difference to what the AI uses.
• Opportunity data is federal-first. Open opportunities come from Grants.gov. Foundation data comes from 990 filings, which reflect past giving and lag by months. There’s no feed of open foundation RFPs.
• The free plan is small. 5 chat messages a day is enough to try it, not to write a full proposal. Scheduled tasks need Pro.
• Web only. No native mobile app, no offline mode and no public API.

Who it’s for: teams and consultants writing several proposals a year who want funder research, organizational context and drafting in one workspace, and who’d rather not pay per seat.

Who should skip it: anyone whose main need is post-award financial management, or teams who need to co-write in real time.

Grantboost

What it is: an AI grant search and writing tool with plans priced per workspace.

• Strengths: It searches a large set of funding sources and matches them to your mission. From Growth up, it drafts proposals and can be trained on your brand voice. It comes with grant templates, and the Team plan has unlimited seats.
• Limitations: No free plan (trial only). The entry Starter plan ($32/month, 1 seat) is search only, with no AI writing, so writing starts at Growth ($49/month, 5 seats). Plans cap active projects, and on the day we checked, the pricing page listed two different project caps for Growth.
• Pricing (checked Sep 24, 2026): Starter $32/mo · Growth $49/mo · Team $66/mo. Annual billing gives two months free.
• Who it’s for: small teams on a tight budget who want search and drafting in one inexpensive tool.

Granted AI

What it is: a grant search and drafting app built around coaching questions and RFP section mapping.

• Strengths: Upload an RFP and it maps out the required sections. It has a large grant and foundation database, a multi-reviewer “Review Board” and DOCX export. The free plan includes grant search, funder profiles and one draft a month.
• Limitations: Professional includes three full seats; any other members (up to ten in total) can view and comment but not edit. Its “funded or refunded” guarantee applies only to Professional and only if you submit three or more proposals in the year.
• Pricing (checked Sep 24, 2026): Basic $29/mo ($18/mo billed annually) · Professional $89/mo ($57/mo billed annually).
• Who it’s for: individual writers who want structured, step-by-step drafting and a low-cost way to start.

Grant Assistant

What it is: a proposal drafting and funder matching tool (Discover and Respond modules) that says it’s trained on more than 7,000 winning proposals. It’s now listed as “by FreeWill.”

• Strengths: Built specifically for proposal responses. It publicly states that customer data isn’t used for training.
• Limitations: No public pricing and no self-serve free plan. You have to talk to sales to see a price.
• Pricing (checked Sep 24, 2026): not published.
• Who it’s for: larger organizations comfortable with a sales-led purchase.

Instrumentl

What it is: a grant discovery and tracking platform with extensive funder data, which has added AI writing on its higher tiers.

• Strengths: One of the largest opportunity and funder databases. It has strong deadline tracking and, from Pre-Award up, AI writing that draws on your past content.
• Limitations: The price. It starts at $299/month billed annually, and the entry Discover plan (up to 3 users) doesn’t include the AI writing features. There’s no free plan, only a 14-day trial.
• Pricing (checked Sep 24, 2026): Discover $299/mo · Pre-Award $499/mo · Full Lifecycle $999/mo, all billed annually (monthly billing costs more).
• Who it’s for: discovery-heavy teams with the budget for a dedicated research platform. See our Grantable vs Instrumentl comparison.

FundRobin

What it is: a grant platform based in the UK with an AI assistant (“Robin”) and compliance support across the UK, US and EU.

• Strengths: Multi-region compliance, and plans include a set number of AI drafts per month.
• Limitations: It’s priced in pounds and caps drafts per month (3 on Growth). There’s no free plan, only a 30-day trial you have to apply for.
• Pricing (checked Sep 24, 2026): Growth £49/mo · Impact £199/mo · 20% off annually.
• Who it’s for: organizations applying to UK and European funders.

General-purpose AI assistants

These are the tools most grant writers try first. They write well, but none of them knows your funders or your organization unless you tell it. See our side-by-side comparisons with ChatGPT and Claude.

ChatGPT

• Strengths: Familiar and flexible. Memory and Projects keep some context between chats, and on paid plans you can upload a full RFP, use deep research and connect Google Workspace or Microsoft 365.
• Limitations: No funder database, so you do the prospect research yourself. Pricing is per user, and Projects start at Plus. The free plan’s context is limited, so long RFPs may not fit. Like every general model, it can make up statistics, so check every number.
• Pricing (checked Sep 24, 2026): Free · Go $8/mo · Plus $20/mo · Business $25/user/mo ($20/user/mo billed annually). OpenAI for Nonprofits discounts Business and Enterprise through its sales team.
• Who it’s for: occasional grant writers who already use it and are comfortable supplying all the context themselves.

Claude

• Strengths: Strong at long, structured prose. It handles long documents, so an entire RFP and a past proposal fit in one conversation. Projects and memory are available, including up to five Projects on the free plan.
• Limitations: No funder data and no grant workflow. Team plans are priced per seat. (Grantable itself runs on Anthropic’s Claude models, so this one is closer to home than it looks.)
• Pricing (checked Sep 24, 2026): Free · Pro $20/mo ($17/mo billed annually) · Max from $100/mo · Team $25/seat/mo ($20/seat/mo billed annually).
• Who it’s for: experienced writers drafting long federal narratives who don’t mind assembling the context themselves.

Gemini

• Strengths: Built into Google Workspace, so it works inside Docs and Drive if your team already lives there. Deep Research helps with needs-statement data.
• Limitations: No grant-specific features. Its context is whatever is in your Google account.
• Pricing (checked Sep 24, 2026): Google AI Plus $9.99/mo · AI Pro $19.99/mo · Workspace plans with Gemini from $14/user/mo (Business Standard, flexible billing).
• Who it’s for: Google Workspace teams who want AI help without adding another app.

Microsoft 365 Copilot

• Strengths: Works inside Word, where many proposals end up, and can read your organization’s Microsoft 365 files.
• Limitations: An add-on to a qualifying Microsoft 365 plan, priced per user. No grant or funder features.
• Pricing (checked Sep 24, 2026): Copilot Business add-on $18/user/mo billed annually. Microsoft advertises nonprofit Copilot pricing too, but its nonprofit page listed a higher figure than the current commercial price, so check with Microsoft before you buy.
• Who it’s for: organizations already paying for Microsoft 365 that want AI inside Word.

Tools we left out of the main comparison

Jasper ($59/mo billed annually, 20% nonprofit discount), Copy.ai ($24/mo billed annually, 5 seats) and Notion AI (now included in Notion Business at $20/member/mo billed annually) come up on other lists. All three are general marketing or workspace AI tools with no grant or funder features. They can help with donor communications, but they aren’t built for proposals, so we didn’t compare them head-to-head.

How to choose

• You write one to three proposals a year: start with the free or $20 tier of ChatGPT, Claude or Gemini. Our guide to prompts that work for grant writing covers how to give them enough context.
• You mostly need to find funders: a discovery platform (Instrumentl, or Grantable’s 990-based funder search) matters more than drafting quality.
• You write many proposals with a team: favor a tool that keeps your organization’s context and funder research in one place and doesn’t charge per seat. That’s where grant-specific tools, Grantable included, earn their price.
• Post-award budgets and reporting are the bottleneck: none of the AI writing tools here replaces grant management or accounting software.

Whichever you choose, you still own the final draft. Check every statistic, keep your organization’s real voice, and read what your funders say about AI use. We cover that in AI grant writing: what works and what funders allow and in can funders tell AI wrote your grant?

Sources

All pages were checked on September 24, 2026.

• Grantable: product source code (plan limits, features) and grantable.co/pricing
• ChatGPT: chatgpt.com/pricing
• Claude: claude.com/pricing
• Gemini: one.google.com/about/google-ai-plans and workspace.google.com/pricing
• Microsoft 365 Copilot: microsoft.com/en-us/microsoft-365/copilot/business and microsoft.com/en-us/nonprofits/empower-your-nonprofit-with-ai
• Grantboost: grantboost.io/pricing
• Granted AI: grantedai.com/pricing
• Grant Assistant: grantassistant.ai (no pricing page published)
• Instrumentl: instrumentl.com/pricing
• FundRobin: fundrobin.com/pricing
• Jasper: jasper.ai/pricing · Copy.ai: copy.ai/prices · Notion: notion.com/pricing

Spot an error or a price change? Email hello@grantable.co and we’ll fix it and note it in the change log.

Change log

• September 24, 2026: Rebuilt as a disclosed-method comparison. Re-checked all pricing on vendor pages. Added Grantboost, Granted AI, Grant Assistant, FundRobin and Microsoft 365 Copilot. Removed GrantStation (a database with no AI writing). Added a Limitations list for every tool, including Grantable. Folded in the retracted March 2026 “we tested 10 tools” post: its test was never run, so none of its scores or results are carried over.
• June 1, 2026: Title and meta description updated. No content changes.
• March 27, 2026: First published.