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Letters｜友人・知人への紹介＆口コミを広げて売上アップ

「Letters」は、Shopifyストア向けの国内No.1の紹介マーケティングツールです。コード不要で簡単に導入でき、口コミや紹介を通じて新規顧客を獲得し、売上アップが見込めます。顧客は紹介を通じて特典を得られるため、口コミが自然に広がりやすく、リピート率やLTVも向上。ROIを改善するツールとして利用されています。

★★★★★4.6 (24)
$39/mo【LIGHT】39$〜/月$249/mo【STANDARD】249$〜/月$689/mo【PRO】689$〜/月
Website ↗ Shopify App Store ↗
what mrrlens sees
MRR · Estimated$983–7k
Opportunity—
Buyer threads · 30 d0
“個別の割引きリンクだけを伝えてもらうとかもっと簡単でシンプルなシステムにしなければ使いづらいアプリだと感じた。”
In English: “I felt it is hard to use unless the system is made simpler, such as just sharing an individual discount link.”
#1 complaint · UX · 1 of 1 complaints read · analysed Oct 29, 2026 · source

01Revenue

$983–7k

A month · the formula and every input are below

How this range is computed

reviews × installs-per-review × paying share × entry price

  • reviews: 24
  • entry price: $39
  • 7–20 active installs per published review (measured: median 12 on the 20 most-installed apps)
  • 15%–35% of installs on a paid plan

A range from public signals and the listed price, not a claim about the company’s books. Methodology.

Store data from the Shopify App Store listing, refreshed daily. Updated 1 d ago. Listed since 2019.

02Why users leave Letters｜友人・知人への紹介＆口コミを広げて売上アップ

UX1 review · 1 of 1

Requires customers to receive recruitment message and register as ambassadors before referring; reviewer wants simpler direct discount-link sharing.

“個別の割引きリンクだけを伝えてもらうとかもっと簡単でシンプルなシステムにしなければ使いづらいアプリだと感じた。” source ↗In English: “I felt it is hard to use unless the system is made simpler, such as just sharing an individual discount link.”

Sample: 1 recent complaint (1–3★ reviews) · clustered Oct 29, 2026 · complaints from Oct 2024–Oct 2024, none in the last 24 months — history, not today · each review labelled by a model, quotes verbatim

03How to build a better Letters｜友人・知人への紹介＆口コミを広げて売上アップ

Build difficultyLowShopify API integration and app approval; no payments, regulation, hardware, or network effects.
Three build ideas that answer these complaintsIncluded in the day pass and Pro.
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04Who wants a better Letters｜友人・知人への紹介＆口コミを広げて売上アップ

0 buyer threads in the last 30 days name Letters｜友人・知人への紹介＆口コミを広げて売上アップ.

05Questions about Letters｜友人・知人への紹介＆口コミを広げて売上アップ

How much revenue does Letters｜友人・知人への紹介＆口コミを広げて売上アップ make?

MRRLens estimates Letters｜友人・知人への紹介＆口コミを広げて売上アップ at $983–7k a month (low confidence). The range comes from public signals (reviews × installs-per-review × paying share × entry price), not from the company's books; the formula and its inputs are shown on this page.

What do users complain about most in Letters｜友人・知人への紹介＆口コミを広げて売上アップ?

Across 1 recent complaints, the most common is ux (1 of 1). Requires customers to receive recruitment message and register as ambassadors before referring; reviewer wants simpler direct discount-link sharing.

What are the best Letters｜友人・知人への紹介＆口コミを広げて売上アップ alternatives?

The closest alternatives MRRLens found are InviteReferrals, Kickbooster Affiliate Programs and Shopify Collabs. The full list, with why users leave, is on the Letters｜友人・知人への紹介＆口コミを広げて売上アップ alternatives page.

See the full x-ray of Letters｜友人・知人への紹介＆口コミを広げて売上アップ

Full 1-star breakdown with verbatim quotes, the build blueprint and every live thread — on every product.