Customer referral softwareViralPayouts vs Letters (友人・知人への紹介&口コミを広げて売上アップ)
ViralPayouts has no monthly fee, pays your affiliates for you and pays recruiters on every program. You pay 10% of what you pay partners, falling to 3%, and nothing in a month when nobody sells. Letters (友人・知人への紹介&口コミを広げて売上アップ) does not say it pays affiliates for you and does not say it has two-tier recruiting. It costs $39 to $689 a month + 0.5% to 3.3% of affiliate revenue.
Every figure for Letters (友人・知人への紹介&口コミを広げて売上アップ) comes from its own pages or named review sites, checked 12 October 2026. Sources are listed at the bottom.
Why brands pick ViralPayouts over Letters (友人・知人への紹介&口コミを広げて売上アップ)
Best fit: A brand outside Japan, or one that wants cash payouts handled and partners recruiting partners.
- $0 a month
No plan and no setup fee. 10% of what you pay partners, falling to 3% at $10,000 a month.
- Payouts done for you
One invoice per program. ViralPayouts sends every partner and recruiter their money and collects tax forms.
- Recruiters built in
Customer links and recruit links on every program, with the override set your way and reversed on refunds.
Side by side
| Letters (友人・知人への紹介&口コミを広げて売上アップ) | ViralPayouts | |
|---|---|---|
| Price | $39 to $689 a month + 0.5% to 3.3% of affiliate revenue | $0 a month. 10% of what you pay partners, falling to 3% at $10,000 a month. |
| Setup fee | Not stated | None |
| Fee for paying affiliates | Not stated | Included in the fee above: no charge to the brand for sending payoutsPartners pay Whop's own fee when they withdraw to their bank |
| Pays your affiliates for you | Not stated | Yes You fund by bank transfer; we pay every partner |
| Two-tier recruiting | Not stated | Yes Two levels on every program: share of commission, share of sale or fixed. Paid on approved sales, never sign-ups |
| Public program directory | No | Yes Partners browse and join with one account |
| Tracking | Personal ambassador referral pages/links; Email tracking; SMS sending (added Feb 2026) | First-party links with click IDs, signed server-to-server events, Stripe Checkout webhook |
| Coupon tracking | Not stated | Yes A code per partner, per program |
| Mobile app tracking | Not stated | App installs, sign-ups and purchases reported from your server through the signed event API, with bounties on them. No SDK to ship in your app. |
| API, webhooks, MCP | Not stated | REST API for brands and partners with an OpenAPI spec, an MCP server for AI agents, a signed event API and partner postbacks |
| Integrations | Shopify Checkout | Stripe Checkout, Shopify orders, any backend via the event API |
Letters (友人・知人への紹介&口コミを広げて売上アップ) plans in full
- LIGHT: $39 a month, plus 3.3% of affiliate revenue. 3.3% of Letters-referred sales; monthly + usage capped at $4,000/month
- STANDARD: $249 a month, plus 1.3% of affiliate revenue. 1.3% of referred sales; total cap $2,666/month
- PRO: $689 a month, plus 0.5% of affiliate revenue. 0.5% of referred sales; total cap $1,666/month
Where ViralPayouts comes out ahead of Letters (友人・知人への紹介&口コミを広げて売上アップ)
What Letters (友人・知人への紹介&口コミを広げて売上アップ) offers
Japanese Shopify stores that want existing customers to become ambassadors and refer friends, with gift-certificate or donation incentives.
Customer referral software
Why ViralPayouts is the better choice
- Two-level recruiting (recruiter override) built into every program
- Pays partners for the brand (via Whop) with no separate payout processing fee
- Public directory of programs with one partner account across programs
- REST API and MCP server
- English-language and works beyond Shopify
What Letters (友人・知人への紹介&口コミを広げて売上アップ) users say
Paraphrased from public reviews. Follow each link to read the original.
Praise
- Orders came in within days of installing; solved per-customer referral page management they could not build in-house (toletta, May 2020). apps.shopify.com
- Exactly the referral platform they were looking for and it led to purchases (CITAA, May 2019). apps.shopify.com
Complaints
- Customers must first register as ambassadors via a recruit message, a hurdle; wants simple personal discount links instead (Oct 2024). apps.shopify.com
- Some parts hard to understand at first (CITAA, May 2019). apps.shopify.com
About Letters (友人・知人への紹介&口コミを広げて売上アップ)
- In their words:
- "国内紹介マッチングアプリNo.1 | 導入実績400店舗突破" (claims No.1 domestic referral app, 400+ stores)
- Company:
- Founded 2018-01-11 (Letters Inc.) · Shibuya, Tokyo, Japan · 株式会社レターズ (Letters Inc.); CEO Takeshi Fuse; also runs PR and welfare businesses
- Named customers:
- CITAA, toletta (Shopify reviewers)
- Website:
- hp.letters.co.jp
Try ViralPayouts on test money
Set your commission and recruiter override, see what each sale costs you, and run it on the test network before a real partner joins. No monthly fee.
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ViralPayouts vs LoyaltyLion (Referrals)Sources for Letters (友人・知人への紹介&口コミを広げて売上アップ) (3), checked 12 October 2026
Letters (友人・知人への紹介&口コミを広げて売上アップ) is a trademark of its owner. ViralPayouts is not affiliated with Letters (友人・知人への紹介&口コミを広げて売上アップ). Prices and features change: check hp.letters.co.jp before you decide. Spot something out of date? Tell us and we will fix it.