Letter Box Pricing

Free Plan (free forever)


Individual Constituent Letters
Individual Gift Letters
Bulk Letters
eSignatures via DocuSign
500 Letters / month
5 Templates

Premium Plan


All of Free Forever
Built-in Email Delivery
Giving Summary Templates
Conditional Templates
Automated Pledge Reminders
Scheduled Letters
Auto Send Letters
Receipt Number Generator
2,000 Letters / month
Unlimited Templates
Need more letters? Add Letter Packs

Premium Plan Pricing

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Pay Annually


Per month billed annually

Pay Month-to-month


Billed month to month

Need extra letter allowance?

Add an extra 2k of letters/month is available by either:

Purchasing a Letter Pack of 2k extra letters,
valid for 30 days from purchase.

Or add a recurring Letter Allowance of 2k extra letters/month – paid annually.

Letter Box user stories

  • We'll be recommending Letter Box to everyone!

    [Our team] …is enjoying the ease of generating and re-generating the receipts.
    Catherine Hamlin Fistula Fnd
  • Functionality that's smart, efficient and easy to use

    We love Letter Box too!!
  • Thank you!

    Thank you for providing it free of charge with so many functions!
    Monte Cassino School
  • I loved the free version so much we upgraded!

    I love the free version so much that I let them know [our team] I would really like to have the email function and more templates available.

    Nappa Land Trust
  • Letter Box is Superb! Time Saver!

    Letterbox is a great product; the letters can be done in bulk and a pdf of the letter is added to each GIFT for that particular donor; you can also do individual letters and save to the record. Red Arc is continuing to enhance the product every day – recent additions are summary letters that you can customize.There is a free version that allows for 5 templates – we started with that and saw the value and upgraded to the premium version (it’s a very reasonable expense) and are so very glad we did.
    Thank you Red Arc for an amazing product!
  • Brilliant Product

    We’ve been using Letterbox for roughly 12 months now and it has been a massive time saver for us with the increasing number of ad hoc receipt requests. The product is constantly being developed and improved with more custom merge fields than when we started using it. This includes us now being able to add in the Receipt Number for these ad hoc receipts. The support team gets back to you within 24 hours and are extremely helpful.
  • Amazing Product

    We love Letterbox! It allows us to do everything that we previously did with the letters in RE and saves copies to the gift so that we can reprint them for the donors whenever it is needed. Their customer service is fantastic.

Got questions? 

Just get in contact, we’d love to chat!