Letter Friend vs thanks.io

Letter Friend has no write-up on Specifiction yet; its figures are above.

thanks.io automates direct mail campaigns for postcards, letters, notecards, gift cards and MagnaCards. Sending is available through its dashboard, REST API, MCP server or integrations. Supported formats include postcards in 4x6, 6x9 and 6x11 sizes, windowed or windowless letters, folded 5x4 notecards, branded gift cards and 6x9 MagnaCards. Campaigns can run as drips, birthday or anniversary sends, holidays, recurring mail, Neighbor Blast radius mailings or paced evenFLOW sends. Recipients can have unique QR codes with scan analytics, available on every plan. A digital handwriting engine uses fonts, AI Fonts and optional Realism Mode; it does not use real pens or human handwriters. ThanksAI Studio can generate campaign designs from plain-English prompts, alongside per-recipient AI copy and dynamic images. Developer tools include REST API v2, webhooks, OAuth2, personal access tokens and MCP servers. Pay as you go is $0/month and includes full API access; Business is $49/month, Professional is $199/month, and Enterprise pricing is custom. Gift card sends require Business, Professional or Enterprise, and postage-included per-piece charges may apply in addition to subscriptions.