Compare the Best AI Tools for UK Charities (2026)

The UK charity AI tooling landscape has matured fast. In 2024, charities mostly used ChatGPT and worried about it. In 2026, there’s a real choice between sector-specific platforms and free generic AI, with different strengths for different use cases.

Comparing the tools directly? See our honest head-to-head breakdowns — CharityIQ vs Plinth, FundRobin, Undercroft and Charity Excellence.

This post is an honest comparison of the six tools UK charities are using in practice. Full disclosure: this list is published by CharityIQ and we are one of the six tools. I’ve tried to be fair to every tool, including admitting where we’re not the right fit. Affiliate links: none.

Last updated: 2 July 2026

How we compared

For each tool, we tested across five standardised tasks:

Drafting a grant application (NLCF Awards for All template)
Drafting an annual report section (impact narrative)
Drafting a donor thank-you email
Summarising a 30-page funder report
Compliance check (governance health)

Four assessment criteria:

Time to complete the task (target: under 60 minutes each)
Output quality (specificity, accuracy, charity context)
Charity-specific knowledge (does it know UK funders, regulators, sector?)
Audit trail (can a trustee see how the output was prepared?)

Every tool was tested at its free tier where available. Paid tools were trialled (where free trial offered) or evaluated based on documented features and external reviews.

No affiliate fees, no paid placements.

Comparison table

Tool	Pricing	UK-specific	Grounded AI	Audit trail	Best for
CharityIQ	£49–£349/mo + free Grant Finder	✓	✓	✓	£25k–£500k charities, integrated workflow
Plinth	Free tier + paid (private)	✓	Partial	Partial	Advice charities, multi-site, case management
FundRobin	From £15/mo	✓	Partial	No	Grant matching only, tight budget
Undercroft	“Talk to us” — bespoke	✓	✓	✓	£500k+ charities, custom AI agents
Charity Excellence AI Bunny	Free	✓ (sector-built)	No	No	One-off bids, beginners
ChatGPT / Claude / Gemini	Free / £20/mo	✗	No	No	Generic drafting and summarising

Tool 1 — CharityIQ (full disclosure: this is our tool)

Pricing: £49 (Starter) / £149 (Growth, most popular) / £349 (Professional) per month, plus a free Grant Finder forever. 14-day free trial on paid tiers, no credit card.

What it does well:
– Grounded in your charity’s data. Profile pulled from Charity Commission, beneficiaries from your records, past applications stored. Every draft cites sources.
– All-in-one for UK charities: grant writing, Charity Commission compliance, impact reporting.
– UK-hosted (AWS London or Azure UK South).
– Audit trail by default — every prompt, source, and human approval logged.
– 12-minute first-draft grant applications with citations.

Where it doesn’t fit:
– We’re focused on UK registered charities specifically. International charities, US nonprofits, large enterprises (£10m+) aren’t our primary target.
– We’re newer than Plinth or Charity Excellence. Customer base is growing but smaller.
– For charities that just need basic case management and bookings (not grants/compliance), Plinth is a better fit.

Best for: UK registered charities with annual income £25,000–£500,000, applying to multiple grants per year, filing under SORP 2026, needing impact reporting that funders read.

→ CharityIQ.co.uk

Tool 2 — Plinth

Pricing: Free tier for small charities. Paid tiers exist for AI features, multi-site, and advanced reporting (specific £ not public — request demo).

What it does well:
– Genuinely free for small charities, no credit card.
– Comprehensive scope: case management, AI grant writer, AI case notes, impact reporting, bookings, payments, multi-site, volunteer management.
– Particularly strong for advice charities and multi-site organisations.
– Wins SEO with comprehensive “Complete Guide” content series.
– Used by tens of thousands of UK charities.

Where it doesn’t fit:
– Generalist breadth — not deep on Charity Commission compliance or SORP 2026 specifically.
– Less focused on small-charity grant workflow at scale.
– AI grant writer is good but not as charity-data-grounded as some sector tools.

Best for: Advice charities, charities running multiple sites, charities needing case management + payments + bookings as a single tool.

→ plinth.org.uk

Tool 3 — FundRobin

Pricing: From £15/month. 30-day free trial. No per-seat fees.

What it does well:
– Aggressive pricing — significantly cheaper than CharityIQ entry tier.
– Self-serve onboarding.
– 5,000+ UK funders in database.
– AI-powered grant matching plus AI proposal writing (“Smart Proposal”).
– GDPR compliant.

Where it doesn’t fit:
– Narrower scope than CharityIQ — focused on grants, not compliance or impact reporting.
– Less of a platform, more of a tool. Doesn’t replace your full charity admin workflow.
– Smaller brand presence than the others.

Best for: Charities prioritising grant matching and drafting, on tight budgets, who don’t need compliance or impact reporting integrated.

→ FundRobin UK

Tool 4 — Undercroft

Pricing: Bespoke. Setup fee + ongoing monthly. “Talk to us” — no public pricing tiers. Implied £thousands range.

What it does well:
– Self-hosted AI agents on UK servers — strong governance message.
– Custom for each charity’s specific needs.
– Audit trails and human approval workflows.
– Built by Spectrum Dynamics CIC — sector-credibility, not external tech vendor.
– 9 named “agents” covering grants, bid writing, impact, compliance, donor stewardship, social, volunteer coordinator, fraud detection, SORP compliance.

Where it doesn’t fit:
– Pricing is bespoke and (based on positioning) not realistic for charities under £500k income.
– No self-serve. Sales cycle is consultative — slower onboarding.
– Single-page website — limited public information.
– Implementations don’t scale the way self-serve platforms do.

Best for: Mid-size charities (£500k+) wanting custom AI agents with high governance and willing to invest in setup.

→ undercroft.co.uk

Tool 5 — Charity Excellence Framework AI Bunny

Pricing: Free with Charity Excellence Framework registration.

What it does well:
– Free, full stop.
– Sector-built — Charity Excellence Framework is one of the most respected UK charity sector resources.
– Structured 17-question approach — you don’t have to think about how to prompt.
– 40+ free policy templates available alongside.
– ChatGPT under the hood, but with sector-specific structure.
– Used by tens of thousands of UK charities.

Where it doesn’t fit:
– Generic ChatGPT output, not grounded in your specific charity’s data.
– No profile memory — each session starts fresh.
– No audit trail.
– Limited to one-off bid drafting; not a workflow tool for ongoing fundraising or compliance.

Best for: Charities new to grant writing wanting structured help. One-off bids. Charities that can’t afford paid tools and need something free.

→ Charity Excellence — Free AI Bid Writing

Tool 6 — ChatGPT / Claude / Gemini (the DIY option)

Pricing: Free (basic). £20/month for ChatGPT Plus, Claude Pro, or Gemini Advanced.

What it does well:
– Free at basic scale.
– Excellent at drafting, summarising, brainstorming.
– Constantly improving — frontier models.
– Available immediately, no onboarding.
– Most flexible for non-charity-specific tasks.

Where it doesn’t fit:
– No charity context — every conversation starts from zero.
– Hallucinates statistics. Will make up plausible-looking numbers.
– No audit trail.
– No UK funder data.
– Not GDPR-safe for beneficiary data (default terms).

Best for: General drafting, summarising long documents, brainstorming, plain-language editing. Anything non-sensitive and reviewed by a human.

For more on where ChatGPT helps and where it hurts UK charities specifically, see our detailed analysis.

From CharityIQ

Full disclosure again: this list is published by us. We’ve tried to be fair to every tool — including admitting where we’re not the right fit.

If your charity has 2+ grants/year, runs compliance, and wants impact reporting in one tool, we’d be delighted to give you a 14-day free trial.

Pricing compared

Tool	Entry price	Mid tier	Top tier
CharityIQ	Free Grant Finder	£49–£149/mo	£349/mo
Plinth	Free tier	Paid (private)	Multi-site enterprise
FundRobin	£15/mo	—	—
Undercroft	Bespoke (£thousands)	Bespoke	Bespoke
Charity Excellence AI Bunny	Free	—	—
ChatGPT / Claude / Gemini	Free	£20/mo	£200/mo (Pro tiers)

For most small UK charities (under £100k income), the choice is between: free (Charity Excellence + ChatGPT), £15–£49/month (FundRobin or CharityIQ Starter), or sector-platform investment (£149+/month).

A decision tree by charity size and need

Pick by your situation:

Under £25k income, occasional bids, no compliance pressure
→ Charity Excellence AI Bunny + ChatGPT (both free)

£25k–£100k income, applying to grants regularly, want simple all-in-one
→ CharityIQ Starter (£49/mo) or FundRobin (£15/mo if grants-only)

£100k–£500k income, multiple grants, SORP 2026 compliance, impact reporting needed
→ CharityIQ Growth (£149/mo, most popular)

£500k–£15m income, want trustee dashboard + multi-user
→ CharityIQ Professional (£349/mo) or Plinth multi-site

Over £15m income, custom AI agents, willing to invest in setup
→ Undercroft (bespoke)

Advice charity / case management heavy / multi-site
→ Plinth (free tier or paid)

Just need a one-off bid, no plans to apply more
→ Charity Excellence AI Bunny (free)

Frequently asked questions

Q: What’s the best AI tool for a small UK charity?
A: For free: Charity Excellence AI Bunny (structured grant writing) plus ChatGPT (general drafting). For paid: CharityIQ Starter (£49/mo) if you want compliance + impact integrated, or FundRobin (£15/mo) if grants-only. The “best” depends on what you actually need.

Q: Is free AI enough for charity work?
A: For non-sensitive admin and one-off tasks, yes. For ongoing fundraising at scale, compliance work, or anything involving beneficiary data, free generic AI hits limits — particularly around audit trail, GDPR, and re-pasting context every time.

Q: How does AI grant writing work?
A: It varies by tool. Generic AI (ChatGPT) requires you to paste in your charity context every time. Sector-specific tools (CharityIQ, FundRobin, AI Bunny) ask structured questions or pull data from your saved profile. The best produce a grounded draft in 12 minutes versus the 22 hours typical for fully manual grant writing.

Q: Are CharityIQ and Plinth competitors?
A: Partially. We overlap on AI grant writing. We diverge on focus — Plinth covers case management, bookings, payments, multi-site, advice work; CharityIQ goes deep on grants, compliance, and impact for charities that need that depth. Some charities use both. For small charities choosing one, the answer depends on whether case management or grant/compliance work is your bigger pain point.

Q: Should I use ChatGPT or sector-specific AI?
A: Both. ChatGPT for drafting communications, summarising documents, brainstorming. Sector-specific AI for grant writing, compliance, and anything where audit trail or charity-specific data matters. They’re complementary, not exclusive.

What to do next

If you’re choosing AI tools for a UK charity, the practical path:

1. Start free. Test ChatGPT and Charity Excellence AI Bunny for two weeks. Document what works.

2. Identify the gap. Where do free tools hit limits? Most charities discover this within a month.

3. Trial a paid tool that fits the gap. Most paid tools offer 14-day or 30-day free trials. Use them.

4. Decide based on data. Time saved per task, quality of output, fit to your workflow. Don’t choose based on marketing.

For charities choosing between sector-specific UK options, that’s specifically what we built CharityIQ for — and our 14-day free trial is exactly long enough to test fit honestly.

See where CharityIQ wins for your charity.
Start a free 14-day trial. No credit card. Compare for yourself.
Start free trial →

Written by Ivan Siyanko, founder of CharityIQ. Ivan runs a UK registered charity and built CharityIQ because the existing AI tools weren’t built for what UK charities actually need.