---
title: "Letters｜友人・知人への紹介＆口コミを広げて売上アップ Shopify App Profile"
description: "【無料開放中】日本製リファラルマーケティングNo.1アプリ。ネット通販の時代に最適なクチコミ戦略！"
canonical_url: "https://shoplist.co/shopify-apps/letters"
markdown_url: "https://shoplist.co/shopify-apps/letters.md"
last_updated: "2026-10-13"
entity_type: "shopify_app"
slug: "letters"
source: "public Shopify app profile allowlist"
---

# Letters｜友人・知人への紹介＆口コミを広げて売上アップ Shopify App Profile

> 【無料開放中】日本製リファラルマーケティングNo.1アプリ。ネット通販の時代に最適なクチコミ戦略！

## Quick answer
Letters｜友人・知人への紹介＆口コミを広げて売上アップ has 0 detected stores in Shoplist. This Markdown profile displays 0 public brand examples; it is not a complete customer list.

## Key facts
- Name: Letters｜友人・知人への紹介＆口コミを広げて売上アップ
- Monitoring status: Storefront detection limited
- Developer: Letters Inc.
- Developer profile: https://shoplist.co/app-developers/letters-inc
- Shopify App Store URL: https://apps.shopify.com/letters-1
- Website: https://hp.letters.co.jp
- Launch date: April 15, 2019
- Shoplist category: Loyalty & Referrals
- Rating: 4.5
- Review count: 32
- Free trial signal: Yes

## Pricing summary
【LIGHT】39$〜/月: $39/month; 【STANDARD】249$〜/月: $249/month; 【PRO】689$〜/月: $689/month

Shoplist has not yet found reliable public storefront evidence connecting a Shopify store to this app. This does not mean the app has no users. Some apps are new, admin-only, server-side, theme-independent, or otherwise difficult to detect from public storefront signals.


## Public callouts
- 口コミによる新規顧客の開拓
- 費用対効果（ROI）の向上
- CSRやPRにも活用可能
## Shopify App Store categories
- Affiliate programs

## Data note
Profile updated: October 13, 2026. This is the profile revision date, not a guarantee that every store was checked on that date.
Public snapshot built: 2026-10-25 11:22:03.623531\+00
Detection metrics refreshed: 2026-10-25 11:22:03.623531\+00
Public app evidence date: 2026-10-13 12:25:23.075595\+00
This generated Markdown profile intentionally exposes only public, stable app-profile fields and a small public app-stack sample from Shoplist. It excludes private contact data, people data, internal scores, crawl provenance, full datasets, and unstable operational fields.

## Related links
- [HTML app profile](https://shoplist.co/shopify-apps/letters)
- [Shopify apps directory](https://shoplist.co/shopify-apps)
- [Shoplist data methodology](https://shoplist.co/data-methodology.md)