SMS and WhatsApp for charity fundraising: what actually works (2025)
Most charities use SMS and WhatsApp as afterthoughts, such as a last-minute event reminder, an occasional campaign message. That approach wastes the potential of two channels that, used well, can transform supporter relationships across your whole fundraising programme.
Used at the right moment, SMS and WhatsApp outperform email for driving action. Sector research consistently shows SMS click-through rates running at 19–26% for charity campaigns. That’s well above email. Most messages are read within minutes of receipt. That matters when timing is the difference between a fundraising page getting set up or not, a regular donor cancelling or upgrading, a supporter feeling valued or forgotten.
This post covers what works: which channel to use when, the one thing most charities get wrong about WhatsApp, and five moments where a single message can make a real income difference. If you want the full detail, we've also produced a free practical guide — download it here.
The mistake most charities make
They treat SMS and WhatsApp as broadcast tools. Send a message, job done.
The channel that really works is the one that responds to what a supporter has actually done or not done. That's a different approach entirely, and it requires a different way of thinking about communication.
The best supporter journeys aren't scheduled. They're triggered.
A participant who hasn't set up their fundraising page five days after registering needs a different message to someone who's just hit 80% of their target. Sending the same message to both is the fastest way to make both feel like a number, not a person.
SMS vs WhatsApp: the simple version
Both channels have a place. The decision is simpler than most guides suggest.
Use SMS when: you need near-certain reach regardless of smartphone or data access, the message is short and requires one clear action, or timing is critical (event-day logistics, payment recovery, a fundraising deadline).
Use WhatsApp when: you want a two-way conversation, you're sending richer content (images, links, a short voice note), or you're building a relationship across an automated journey.
Email remains essential for detail, formal confirmation, and anything that needs a paper trail. The three channels work together — they're not replacements for each other.
The WhatsApp product you actually need
Many charities assume "WhatsApp" means the app on their phone. For outbound supporter journeys at scale, it doesn't. The WhatsApp Business API, accessed through an approved provider such as Thread Fundraising, is what enables automated journeys, milestone-triggered messages, and personalised supporter communications across a full events programme or individual giving portfolio.
Without it, you're limited to manual conversations or broadcast lists. That's fine for small organisations. For anything at scale, the API is the tool that makes it real.
Five moments where one message makes the difference
These are the highest-return touch-points across a supporter journey. Each one requires a single well-crafted message. None requires a full platform strategy to test.
1. Post-registration, day three — the page setup nudge
Participants who set up their fundraising page in the first 48–72 hours raise significantly more than those who don't. A short SMS sent to anyone who hasn't set up their page by day three, with a direct link and a single action, is one of the cheapest and highest-return interventions in events fundraising.
2. The fundraising milestone message
When a participant hits 25%, 50%, or 80% of their target, they need to hear about it. Not in a scheduled newsletter. In the moment it happens. A message that names their total, celebrates the milestone, and offers one practical tip to get to the next level works because it's relevant, timely, and personal. This is where live JustGiving and Enthuse integration changes everything: the message fires automatically, for each individual fundraiser, based on what they've actually raised.
3. The post-event thank you
Most organisations send one thank-you email and move on. That's the moment the long-term relationship is built or abandoned. A WhatsApp message within 24 hours of event completion that names the participant, their total, and the specific difference it makes, costs almost nothing and signals that the organisation noticed.
4. The new regular giver welcome
Setting up a direct debit is one of the most significant acts of trust a supporter makes. A warm WhatsApp message in the 24 hours after a first direct debit is set up: specific to the amount, connected to impact, genuinely grateful; can change how that supporter feels about their decision. Bloomerang's 2024 Mission Retainable research found donors are 39% more likely to give again when thanked promptly and personally.
5. The failed payment recovery
A warm, non-accusatory SMS within 48 hours of a failed direct debit, with a direct link to update payment details, can recover a significant proportion of lapsed regular gifts before they are formally cancelled. Most charities rely on a standard letter or email. Many donors never see it.
Thread Messaging: built for this
Thread Messaging is the only UK charity SMS and WhatsApp platform with live integrations to platforms such as JustGiving. Messages are triggered automatically by real fundraising events — milestone reached, page set up, target exceeded — for each individual fundraiser, without staff having to do anything.
Three tiers, all built specifically for fundraisers who want to strengthen relationships with their supporters:
Thread Stitch — £29/month For smaller charities getting started. SMS andWhatsApp message, QR code generator, and sector-built message templates. Send a professional campaign within hours of signing up.
Thread Weave — £99/month For charities running events or individual giving programmes. Adds the live JustGiving and Enthuse integration, automated supporter journeys, and milestone-triggered messaging. This is where the real stewardship capability is.
Thread Tapestry — £249/month For larger organisations running multi-channel strategies. Adds an AI autoresponder, full Thread platform access, and a quarterly strategy session with our team.
All tiers include a set amount of free monthly credits, pay-as-you go auto top-up credit management, delivery reporting, and access to the Thread community. Annual pricing saves two months' cost across all tiers. You can also add ‘pay-as-you-go’ email at no extra cost - guaranteed cheaper than Mailchimp with more fundraising-specific features!
Get the free guide
We've turned everything above — and much more — into a practical, plain-English PDF guide. It covers every stage of the event supporter journey, eight individual giving use cases, a compliance checklist, and example messages for each moment.
Download: A Practical Guide to Using SMS and WhatsApp for Charity Event Fundraising
No obligation. No form beyond an email address. Just a practical resource you can use straight away.
Three questions charities ask us most
Do we need consent before sending SMS or WhatsApp messages?
The new soft opt-in laws outlined in Data (Use and Access) Act 2025, means that you don’t need explicit opt-in for sending SMS or WhatsApp messages provided you follow PECR and your own charities privacy policy allows it. Though there are certain conditions:
Existing Supporter: You must have obtained the phone number directly from the individual.
Sale or Negotiation: The number was collected during the sign up of a marketing or fundraising product / event etc. .
Similar Products/Services: The marketing message is about your own similar products or services.
Opt-Out: The first message you send must have an opportunity to opt-out and subsequent messages make it easy to unsubscribe too.
If you don’t use the soft opt-in laws then you’ll require explicit opt-in consent for marketing or fundraising messages by SMS or WhatsApp. A single, clearly worded checkbox on your registration form or donation page is all you need to start collecting this properly.
What is the WhatsApp Business API?
It's the enterprise version of WhatsApp that enables bulk messaging, automated journeys, and supporter communications at scale. It's accessed through an approved Business Service Provider, such as Thread Fundraising. We handle the connection, setup, and template approval on your behalf.
How is Thread Messaging different from generic SMS tools?
Most SMS tools are channel-only: they send messages, but have no understanding of what the supporter has actually done. Thread Messaging can connect to your live fundraising data from your CRM, JustGiving, Fundraise Up and other platforms. This means messages can be triggered by real events — not a calendar. No other UK charity messaging platform offers this today.
