Stripe billing + subscriptions
Free / Pro / Family tiers with webhook-verified upgrades, customer portal wired, dunning + grace period handling, and the seven prod edge cases already solved.
Next.js templateLaunching
AI Personal Finance — SaaS Starter
Production-ready Next.js 16 + Stripe + Claude API + Supabase RLS — 45 features shipped across 6 phases. Ship a fintech SaaS in 4 weeks instead of 4 months.
$129$199
first 20 buyers — then $199
7-day no-questions refund · Instant delivery
Who this is for
- Indie devs building a fintech SaaS who do not want to spend three months on Stripe + Supabase + AI plumbing before shipping a single feature.
- Founders entering Vietnam or Southeast Asia fintech — first-class VN, ID, TH locale support and tax calculators baked in from day one.
- Agencies building white-label personal-finance dashboards for clients — production-ready security, billing, and admin analytics out of the box.
Tech stack
Everything is plain TypeScript + React. No runtime lock-in — you own the code.
Next.js 16React 19TypeScriptTailwind 4SupabaseStripeClaude APIi18nextVitestPlaywright
What’s inside
Claude API weekly AI insights
Localized system prompts (VN / EN / ID / TH), Smart Forecast Engine for 3-12 month cashflow projections, and an Action Recommender that surfaces 1-3 weekly suggestions based on actual spending.
Multi-currency + tax calculators
Locale-aware `formatAmount` for VND, IDR, THB, USD, plus working tax calculators for Vietnamese PIT, Indonesian PPh 21 (5 brackets, PTKP 54M), and Thai PIT (8 brackets).
Gamification engine
Streaks, XP / 10 level thresholds, 10 badge types, streak freeze, fire-and-forget award pipeline. Wakes dormant users by ~40% in our cohort vs no-gamification control.
Admin analytics + investor reporting
MRR / LTV / churn dashboards, cohort LTV heatmap, onboarding funnel events with cron snapshots, and one-click investor PDF export via jsPDF.
Public API v2 + TypeScript SDK
Batch transaction import (100/call), webhook event filtering, rate-limited usage stats endpoint, and a typed `FinanceAIClient` SDK with 429 auto-retry.
Security baseline (production-grade)
Content-Security-Policy, centralized rate limiting middleware, Supabase RLS on every table, webhook HMAC signature verification, security headers (X-Frame-Options, COOP, etc).
Bilingual + SEA-localized
Vietnamese-primary + English UI with full i18n, SEA partials for Indonesian and Thai (categories + AI prompts + tax brackets), browser-locale auto-detect.
Tested + CI/CD ready
83+ unit tests, Playwright E2E smoke suite covering 5 critical flows, GitHub Actions pipeline (lint + type-check + build + test + lighthouse), Docker multi-stage, UptimeRobot health endpoints.
FAQ
How is this different from a generic SaaS starter?
It is the actual source running on kpboards's finance product. 45 features, 6 phases, every wire is battle-tested in production. Generic starters give you the auth + billing skeleton; this gives you Stripe edge cases solved, RLS policies that survive an audit, AI prompts that already work in 4 languages, and admin analytics you would otherwise build from scratch.
Do I need a Vietnamese / SEA market to use this?
No. The bilingual VN / EN UI plus partial ID + TH locales are a head start if you target SEA, but every section is i18next-driven so you can swap to any locale. The multi-currency + tax calculators are also opt-in.
What about Stripe in Vietnam?
The codebase uses Stripe directly. If you are a VN founder, you will need a Stripe-supported entity (Stripe Atlas / US LLC) or use a Merchant of Record like Lemon Squeezy. The wiring is processor-agnostic where it matters; the customer-portal + webhook layer is the heavy lift this saves you.
Can I use this for client work?
Yes. Single-developer license covers unlimited apps for yourself or for clients you bill directly. Redistributing the source itself (selling, posting on marketplaces, public repo) is not allowed.
Will I get updates?
Six months of free updates included. I push monthly minor versions (bug fixes, Next.js / React bumps, occasional features). After that, a paid upgrade unlocks another twelve months.
What about refunds?
Fourteen-day no-questions refund. If `bun install && bun dev` does not boot on a fresh machine, email me with the error and I will refund within one business day.
Skip the setup. Ship tonight.
Code you own, forever. No runtime lock-in, no subscription.