fundraising Beginner Development Director Executive Director ✓ Tested 8.04/10

Thank You Letter - Mid-Level Donor

Appreciation letter for donors giving $100-$999

The Prompt

The Prompt

Create a personalized mid-level donor thank-you letter that a small nonprofit can send quickly while still feeling bespoke.

The thank-you letter should:
- Use these inputs: [ORGANIZATION NAME], [MISSION STATEMENT (1 sentence)], [DONOR NAME], [AMOUNT], [GIFT DATE], [PREVIOUS GIFT AMOUNT/DATE or “N/A”], [YEARS GIVING], [DONOR INTEREST AREA], [PROGRAM/IMPACT EXAMPLE], [IMPACT UNIT + COST (e.g., “$50 = one counseling session”)], [CITY/REGION], [NEXT TOUCHPOINT (e.g., program tour date/report month/event invite)], [FORMAT: LETTER/EMAIL], [TONE], [SIGNER NAME], [SIGNER TITLE], [PREFERRED SIGN-OFF].
- Length: 200–300 words for the main letter.
- Tone options [TONE]: FORMAL (polished, restrained), WARM (professional and personable—default), CASUAL (conversational, friendly).
- If [FORMAT: EMAIL], include a 4–7 word subject line; if LETTER, omit subject.
- Follow this order: salutation; immediate thanks with [AMOUNT] and [GIFT DATE]; acknowledge upgrade and/or [YEARS GIVING]; 1–2 concrete impact sentences tied to [PROGRAM/IMPACT EXAMPLE] and simple math using [IMPACT UNIT + COST]; brief mission alignment; authentic human detail (no client identifiers if sensitive); mention [NEXT TOUCHPOINT] without asking for money; invitation to connect; closing and signature.
- Make it donor-centered (use “you/your” more than “we/our”); plain language (grade 7–9 readability).
- Localize with [CITY/REGION] if provided.
- Include an optional P.S. that reinforces impact or the upcoming touchpoint (no solicitation).
- Provide a 1–2 sentence phone call script for a follow-up within 1 week.
- Provide a 1–2 sentence handwritten note version for card/enclosure.
- Avoid clichés (“valued partner,” “make a difference”), jargon, guilt or savior language, passive voice, multiple exclamation points, and any links or asks.

Quality bar: Specific, accurate, and human. Double-check names, amounts, dates, and impact math. Mid-level donors must feel seen: reference their history, show tangible outcomes at their giving level, and clearly signal the next touchpoint—without turning this into another ask.

How to Customize

  1. Replace all [BRACKETED] fields with your specific information
  2. Adjust tone and length as needed for your audience
  3. Review and personalize before using

Pro Tips

  1. Test this prompt with your preferred AI tool before using in production
  2. Always review AI output for accuracy and appropriateness
  3. Customize outputs to match your organization’s voice and brand

(See other prompts in the fundraising category)

Example Outputs

Compare scenarios: We tested this prompt with 3 different nonprofit contexts. Each scenario shows outputs from GPT-5, Claude, and Gemini. Select a model above each scenario to compare.

Small Community Org

Volunteer-led nonprofit in a rural Appalachian town providing emergency heating support, minor home repairs, and weekly food deliveries to seniors; donor is a long-time resident upgrading during the winter campaign.

View scenario details
[AMOUNT]:1,500
[ORGANIZATION NAME]:Pine Hollow Neighbor Network
[CAMPAIGN/PROGRAM NAME]:Winter Heat & Home Repair Fund
[FORMAL/WARM/PROFESSIONAL]:Warm
[SIGNER NAME and TITLE]:Renee Calloway, Executive Director

Dear [First Name],

Thank you for your generous $1,500 gift to Pine Hollow Neighbor Network’s Winter Heat & Home Repair Fund. Your support arrives at exactly the moment when neighbors are choosing between warmth and groceries, and I want you to know how much your commitment means to all of us.

We were especially grateful to see you increase your support this year—thank you for stepping up. That added vote of confidence tells our team, and the families we serve, that we can move quickly when the temperature drops and a furnace fails.

Your gift will have immediate, practical impact this winter. It will fund urgent repairs so seniors aren’t left in the cold, keep service from being shut off for families facing a temporary shortfall, and equip households with weatherization kits—door sweeps, window film, and pipe insulation—that make drafty homes safer and more efficient. In real terms, your $1,500 will cover a couple of emergency furnace fixes, prevent a heat shutoff for a family in crisis, and stock enough simple repairs to warm multiple apartments. That’s a substantial difference, felt right away.

I also want to acknowledge who you are to this community. [Personal touch: e.g., As a Maple Street neighbor and Tool Library volunteer, you’ve seen how a small repair can change a whole winter for a family.] Your care for your neighbors shines through, and we’re proud to count you as a vital part of the Pine Hollow Neighbor Network.

We’d love to keep you connected to the results you make possible. You’ll receive our monthly e-newsletter with brief stories from the field, and we share photo updates on Instagram and Facebook. If you ever want a quick update call, I’m happy to connect personally.

With heartfelt thanks for keeping our neighbors warm,

Renee Calloway Executive Director Pine Hollow Neighbor Network

Generated: Nov 1, 20253139 tokens$0.0447 cost
AI Evaluation Details (Score: 8.8/10)
Reasoning:

This is a strong, usable donor thank-you letter that hits all major requirements with appropriate warmth and specificity. The concrete impact details and community-focused language feel authentic to a small rural nonprofit. Minor weaknesses include a placeholder for personalization and slightly exceeding word count.

Strengths:
  • Excellent concrete impact breakdown - the specific examples (furnace repairs, shutoff prevention, weatherization kits) make the $1,500 tangible and meaningful
  • Strong acknowledgment of the upgrade in giving level that feels genuine rather than transactional
  • Appropriate warm tone that balances professionalism with community intimacy, perfect for a small-town nonprofit
  • Good variety in engagement invitations (newsletter, social media, personal call) without being pushy
  • Opening line effectively connects the gift to urgent community need without being manipulative
  • Natural flow and readability - sounds like something a real ED would write
Weaknesses:
  • Word count is approximately 320-330 words, slightly exceeding the 350-word maximum but within reasonable range
  • The bracketed placeholder [First Name] and [Personal touch] section require manual completion, reducing immediate usability
  • The personal touch example, while helpful, might be too specific and could feel awkward if the suggested details don't match the actual donor

Mid-Size Professional Org

Urban arts education nonprofit serving Chicago Public Schools with teaching-artist residencies; donor is an alum parent and small business owner who increased their support for the after-school music program.

View scenario details
[AMOUNT]:2,500
[ORGANIZATION NAME]:Chicago Youth Music Collective
[CAMPAIGN/PROGRAM NAME]:After-School Modern Band Residencies
[FORMAL/WARM/PROFESSIONAL]:Professional
[SIGNER NAME and TITLE]:Ethan Park, Director of Advancement

Dear [Donor Name],

Thank you for your generous $2,500 gift to Chicago Youth Music Collective in support of our After-School Modern Band Residencies. Your commitment is a substantial investment in Chicago’s young musicians, and we’re truly grateful. [If this represents an increase from your previous giving: We’re especially honored that you chose to raise your level of support this year—your confidence in our students and teaching artists means a great deal.]

Your gift will have a direct, measurable impact this semester. At $2,500, you are underwriting a full residency at one partner school, including: - 30 hours of small‑group instruction led by a professional teaching artist - Access to instruments and equipment (with maintenance and repairs covered) - Curriculum materials and rehearsal resources - Transportation support so students can participate consistently - A culminating community showcase where students perform the songs they’ve created together

This support translates into real growth for roughly 12–15 students: improved musicianship, teamwork, confidence, and the experience of belonging to a creative ensemble after school.

We also want you to know how much we value you as part of the Chicago Youth Music Collective community. I especially appreciated [personal touch—e.g., hearing about your own band days at Whitney Young/meeting you at the Fall Student Showcase/your enthusiasm for getting more girls on stage]. Your perspective and encouragement energize our team and inspire our students.

We’ll keep you updated with photos, stories, and performance dates through our monthly newsletter and occasional program emails. If there are specific schools or instruments you’re most interested in, please let me know—our updates can reflect your interests. You’re always welcome to reach me directly at [phone/email].

Thank you again for making such a meaningful difference through the After-School Modern Band Residencies. We’re proud to have you in our circle of supporters.

With appreciation,

Ethan Park Director of Advancement Chicago Youth Music Collective

Generated: Nov 1, 20252070 tokens$0.0287 cost
AI Evaluation Details (Score: 8.4/10)
Reasoning:

This is a strong, professional donor thank-you letter that hits all major requirements and provides specific, compelling impact details. The tone is appropriately professional yet warm, and the structure is clear and usable. Minor weaknesses include placeholder text that wasn't fully resolved and slightly exceeding the word count.

Strengths:
  • Excellent specificity on impact—the bulleted breakdown of what $2,500 funds is concrete and compelling, showing exactly how the gift translates to student outcomes
  • Strong professional tone that balances warmth with formality, appropriate for a mid-level donor in an arts education context
  • Well-structured with clear sections that flow logically from gratitude to impact to community connection to next steps
  • Effective acknowledgment of the donor's upgrade with bracketed conditional text that can be easily customized
  • Good personalization opportunities with specific placeholder examples that guide the user on what to include
  • Appropriate restraint—no immediate ask for additional funds, as requested
  • Practical invitation to stay connected with specific, actionable options
Weaknesses:
  • Word count is approximately 360-380 words, exceeding the 250-350 word target range
  • Contains unresolved placeholder '[Donor Name]' at the opening, which should have been flagged or handled differently
  • The bracketed conditional text about giving increase is awkwardly placed mid-paragraph rather than integrated more smoothly
  • The personal touch section uses bracketed examples rather than demonstrating how to write it naturally, which may confuse some users about whether to keep the brackets

Large Established Org

Well-established coastal conservation nonprofit with regional offices along the Gulf and Atlantic coasts; donor is a repeat supporter who stepped up their giving after the hurricane season appeal.

View scenario details
[AMOUNT]:5,000
[ORGANIZATION NAME]:Coastal Habitat Alliance
[CAMPAIGN/PROGRAM NAME]:Living Shorelines Initiative
[FORMAL/WARM/PROFESSIONAL]:Formal
[SIGNER NAME and TITLE]:Amina Patel, Chief Development Officer

Dear [Donor Name],

Thank you for your generous $5,000 contribution to Coastal Habitat Alliance in support of the Living Shorelines Initiative. Your commitment is deeply appreciated and makes a substantial, tangible difference for our coast and the communities that depend on it. We are especially grateful for your leadership [and for increasing your support from your previous giving level].

Your gift will accelerate on-the-ground work that replaces vulnerable hard barriers with nature-based protections. Specifically, it will help: prepare and plant native marsh grasses that stabilize eroding edges; install biodegradable materials and oyster reef modules that buffer waves and improve water quality; and support community volunteer training, wildlife monitoring, and permitting so projects are done efficiently and responsibly. In short, your generosity advances shoreline segments from design to durable habitat, creating nurseries for fish and birds while safeguarding nearby neighborhoods from storms and rising seas.

Beyond the impact in the field, please know how much we value you as a member of the Coastal Habitat Alliance community. Our staff, scientists, and volunteers are motivated by partners like you who share a steady, practical vision for resilient coastlines. [Personal note about donor—for example: I appreciated your insights about marsh restoration during our call last month; your perspective reflects a deep care for this work.]

We look forward to keeping you informed as projects progress. You will receive our e-newsletter with field updates, photos, and impact highlights, and we would be delighted to share invitations to occasional site visits and briefings. If you ever wish to tailor how you receive updates, please let us know; we want these communications to be meaningful for you.

Thank you again for your significant support of the Living Shorelines Initiative. We are honored to partner with you in protecting the places we all love.

With appreciation,

Amina Patel Chief Development Officer Coastal Habitat Alliance

Generated: Nov 1, 20252105 tokens$0.0292 cost
AI Evaluation Details (Score: 8.6/10)
Reasoning:

This is a high-quality donor thank-you letter that successfully balances formality with warmth and provides specific, concrete impact details. It meets all prompt requirements and would be immediately usable by a nonprofit professional with minimal customization. The letter demonstrates sophisticated donor stewardship practices while maintaining authenticity.

Strengths:
  • Excellent specificity on impact - the middle paragraph provides concrete, tangible details about what the $5,000 accomplishes (marsh grasses, oyster reef modules, volunteer training) rather than vague generalities
  • Strong stewardship approach - acknowledges the donor as a community member, offers multiple engagement options, and respects donor preferences without making an immediate ask
  • Well-structured flow - moves logically from gratitude to impact to relationship-building to future connection
  • Appropriate formality - maintains professional tone while avoiding stiffness; phrases like 'deeply appreciated' and 'honored to partner' fit the formal request
  • Smart use of bracketed placeholders - includes [Donor Name] and optional language for upgrade acknowledgment, plus guidance for personalization
  • Proper word count - approximately 320 words, within the 250-350 range specified
Weaknesses:
  • The bracketed personal note is somewhat generic in its example - while it provides guidance, a more specific placeholder instruction might be more helpful
  • Minor redundancy - 'substantial, tangible difference' and later 'significant support' cover similar ground
  • The phrase 'steady, practical vision' is slightly abstract for an otherwise concrete letter

Test Summary: Generated Nov 1, 20253 scenarios • 9 total outputs • Average quality score: 8.04/10 • Total validation cost: $0.1221