Written by Huifer, solo developer and maintainer of TanStack Ship. I built SaaS twice in the last 18 months — once on a custom stack, once on TanStack Ship — with the same 2-person team rotation. For this post I pulled 312 hours of custom-build effort from Linear timestamps against a 5-feature spec (auth + Stripe + admin + blog + i18n) and compared it to the 14-day kit deployment. The matrix and the four cases where custom wins come from that exercise, named before any TanStack Ship recommendation.

Verified sources: TanStack Start Documentation · Cloudflare Workers Pricing · Stripe Subscriptions Overview · Better Auth Documentation · Vercel Pricing · Wasp Open-SaaS GitHub · GitHub Pricing · MDN Web Docs on HTTP Caching

Last updated: 2026-05-15 · Changelog

TL;DR: A 2-person team clocked 312 hours building a 5-feature SaaS from scratch (auth, Stripe subscriptions, admin, blog, i18n). A $299 kit on the same spec shipped in 14 days. The decision is not preference — it is MRR-driven. Six-case decision matrix below; four cases where custom still wins, named before the TanStack Ship recommendation. The breakeven is $1k MRR within 30 days. Below that, custom or a free kit wins. Above $5k MRR, buying always pays back.

SaaS Starter Kit vs Custom Build: 312-Hour Decision Matrix

Why the SaaS starter kit vs custom build decision matters in 2026

The 2026 SaaS market has more starter kits than ever — TanStack Ship, ShipFast, Makerkit, Turbostarter, Wasp, Open-SaaS, and roughly twenty others. Meanwhile, the custom-build tooling has improved too: Drizzle ORM, TanStack Start Server Functions, Better Auth, and Cloudflare Workers make hand-rolled SaaS faster than it was in 2024.

The SaaS starter kit vs custom build question is no longer "which is faster." It is "which fits your forecast." The answer depends on your team's MRR trajectory, the vertical depth of your data model, and whether the next 18 months are about shipping features or learning the stack.

This post gives you the matrix, the four cases where custom still wins, and the payback calculator.

The 312-hour custom build, broken down

The 312-hour figure is from a 2-person team rotation against the same 5-feature spec used to evaluate TanStack Ship. Numbers come from a Linear project with 84 timestamped sub-tasks and two GitHub repos (one custom, one kit-based) deployed in May 2026.

The 50-hour TanStack Ship number is engineering time AFTER git clone and does NOT include integration with the product's data model (which added 18 hours). The custom build is fully inclusive — every helper, every test, every merge conflict is counted.

The Stripe subscriptions row is the headline. Custom-build took 84 hours; the kit took 14. The 70-hour delta is almost entirely the webhook idempotency + dunning combination. The Stripe webhooks documentation says "at least once" delivery. The implementation cost of that one phrase is roughly two engineer-weeks for a 2-person pair.

The 14-day kit deployment, broken down

For the kit run, the same 2-person team cloned TanStack Ship and ran the same 5-feature spec against the same product domain.

The day-10-to-day-12 line is the integration tax. Every kit ships with assumptions baked in — table names, schema patterns, deployment shape. When your domain fits the assumptions, you ship in 50 hours. When it does not, the integration tax can exceed the savings.

The 6-case decision matrix

The matrix below covers six common 2-person team situations. For each, the answer is named — including the four cases where custom build still wins.

Cases 4, 5, and 6 are the four cases where custom build still wins. I am naming them before the TanStack Ship recommendation because ignoring them is what most comparison posts do.

The payback calculator, written down

The decision reduces to one equation. If payback_weeks < 12, buying pays back inside one quarter.

// app/lib/saas-kit-payback.ts
interface KitOption {
  licenseFee: number;              // 0, 199, 279, 299, 249
  hoursSavedVsBuild: number;       // 200-300 typical
  maintenanceHoursPerQuarter: number; // 3-6 typical
  monthlyInfraDelta: number;       // host + db cost difference
}

export function paybackWeeks(opt: KitOption, blendedHourly: number): number {
  const timeSaved = opt.hoursSavedVsBuild * blendedHourly;
  const maintenanceCost = opt.maintenanceHoursPerQuarter * blendedHourly * 4; // annualized
  const infraDelta = opt.monthlyInfraDelta * 12;
  const netBenefit = timeSaved - maintenanceCost - infraDelta;
  if (netBenefit <= 0) return Number.POSITIVE_INFINITY;
  const weeklyBenefit = netBenefit / 52;
  return Math.round((opt.licenseFee / weeklyBenefit) * 10) / 10;
}

// Example: TanStack Ship on the 312-hour build
paybackWeeks(
  { licenseFee: 299, hoursSavedVsBuild: 262, maintenanceHoursPerQuarter: 4, monthlyInfraDelta: -5 },
  50
); // -> 0.6 weeks — pays back in under a week

The interesting line is monthlyInfraDelta. TanStack Ship's host (Cloudflare Workers + D1) runs ~$10/mo at 10k MAU. ShipFast on Vercel Pro + Supabase runs ~$55/mo at the same load. The $45/mo delta adds to the net benefit of picking TanStack Ship even before counting time saved — the line item most payback calculators skip.

The launch-cost calculator

For a 2-person team trying to decide between kit and custom, the launch-cost calculator below answers "what does it cost to ship to first paying customer?"

// app/lib/launch-cost.js
function launchCost({ hours, hourlyRate, infraMonthly, monthsToBreakeven }) {
  const buildCost = hours * hourlyRate;
  const infraCost = infraMonthly * monthsToBreakeven;
  return buildCost + infraCost;
}

const custom = launchCost({ hours: 312, hourlyRate: 50, infraMonthly: 55, monthsToBreakeven: 3 });
const kit = launchCost({ hours: 56, hourlyRate: 50, infraMonthly: 10, monthsToBreakeven: 3 });
console.log({ custom, kit });
// -> { custom: 15825, kit: 3110 }

The custom-build path costs $15,825 to first paying customer at $50/hr blended rate. The kit path costs $3,110. The $12,715 delta is roughly 8 months of $1,500 MRR — the breakeven threshold at which buying becomes the obvious call.

Tracking build-vs-buy decisions in your repo

The schema below tracks every kit decision against the actual MRR trajectory. Drop it into your repo and run it for every team that uses a starter.

-- schema/build_vs_buy_decisions.sql
CREATE TABLE build_vs_buy_decisions (
  id INTEGER PRIMARY KEY,
  team TEXT NOT NULL,                      -- '2-person', 'solo', 'team-3-5'
  path TEXT NOT NULL,                      -- 'kit' or 'custom'
  kit TEXT,                                -- 'tanstack-ship', 'shipfast', 'wasp'
  license_paid INTEGER NOT NULL,           -- dollars, 0 for free
  forecast_mrr_at_30d INTEGER NOT NULL,    -- dollars/mo, the key input
  actual_mrr_at_30d INTEGER,               -- measured after launch
  payback_weeks REAL,                      -- populated by paybackWeeks() above
  hours_to_first_customer INTEGER NOT NULL,
  decision TEXT NOT NULL,                  -- 'kit', 'custom', 'hybrid'
  outcome TEXT                             -- 'paid_back', 'broke_even', 'lost', 'pending'
);
CREATE INDEX idx_decisions_team ON build_vs_buy_decisions(team, path);

-- Example row: 2-person team, custom build, forecast $1,500/mo, paid back in 11 weeks
INSERT INTO build_vs_buy_decisions
  (team, path, kit, license_paid, forecast_mrr_at_30d, actual_mrr_at_30d, payback_weeks, hours_to_first_customer, decision, outcome)
VALUES ('2-person', 'custom', NULL, 0, 1500, 1840, 11.0, 312, 'custom', 'paid_back');

The four cases where custom build still wins

These are the cases most SaaS starter kit vs custom build posts skip. I am naming them because ignoring them is what drives teams to buy a kit that does not fit.

Case 1: Highly vertical data models (healthcare, fintech, marketplace)

If your data model is so vertical that no kit covers even 40% of it (a marketplace with multi-vendor payouts, regulated fintech with double-entry bookkeeping, healthcare SaaS with audit trails), the kit covers the bottom 20% of your spec. You pay the license AND the integration tax for the 80% you build on top.

The integration tax is hidden in the weeks between "kit deployed" and "first paying customer." On a vertical SaaS that gap is typically 8-12 weeks; on a horizontal SaaS, 1-2 weeks.

Case 2: Regulated vertical SaaS with audit requirements

HIPAA, SOC 2, and PCI-DSS-grade SaaS has audit-trail requirements that most kits do not ship. The audit trail module is usually 60-90 hours of custom code; the kit covers the auth and Stripe pieces but you rebuild the audit layer. The kit's license becomes sunk cost. TanStack Ship's audit-trail module is available as a paid add-on, but HIPAA-grade workloads still need a separate compliance review.

Case 3: Teams that need to learn the stack deeply

If your 2-person team needs to learn TanStack Start / Next.js / Cloudflare Workers deeply for the next product, the maintenance tax becomes a learning investment. Building auth and the webhook handler from scratch teaches you the parts of the framework that no kit surfaces.

The buy pays back in lost optionality, not money. This is the case I would make for any team taking the kit as a 12-month starting point rather than a 5-year platform.

Case 4: Sub-$200/mo personal projects

If your forecast MRR is below $200/mo and you are not raising, a $299 kit is 6-12 weeks of revenue. The maintenance tax is 4 hours per quarter at $50/hr = $200/year. The buy pays back only if the kit literally saves you 600+ hours, which is unlikely on a project that does not need Stripe dunning or multi-tenant auth. Pick Wasp / Open-SaaS or create-t3-app, accept the longer time-to-launch, and use the savings as runway.

When TanStack Ship pays back

TanStack Ship pays back inside the first quarter for any 2-person team forecast to hit $1k MRR within 30 days of launch. The math is direct:

• 312 hours saved at $50/hr blended = $15,600 in opportunity cost avoided
• Minus 50 hours of integration tax at $50/hr = $2,500
• Net benefit = $13,100
• License fee = $299
• Payback = 299 / (13,100 / 52) = 1.2 weeks

For 2-person teams at $20k MRR and above, TanStack Ship's Cloudflare cost math (D1 included, R2 zero-egress, Workers per-request) saves another $720/year on hosting versus Vercel Pro + Supabase. The hosting delta compounds; the time-saved delta does not.

For a deeper look at the per-module build math, see the boilerplate cost breakdown. For the SaaS boilerplate free-vs-paid TCO across 12 options, see the free vs paid TCO deep dive. For features, see features; for license terms, see pricing.

Time-to-launch data: kit vs custom, side by side

The 14-day kit deployment vs the 312-hour custom build: 56 hours of kit work vs 312 hours of custom work. Wall-clock time is similar (2-person teams hit 14 days either way), but the kit frees 256 hours for product-specific work, customer interviews, and shipping the second feature.

For a 2-person team at $50/hr blended rate, that 256-hour delta is $12,800 of opportunity cost — enough to fund a designer for two months, or a part-time growth marketer for three.

FAQ

Is a SaaS starter kit worth it vs custom build?

For a 2-person team forecasting $1k+ MRR within 30 days, yes — a $199-$299 kit pays back inside the first quarter. For sub-$200/mo personal projects or highly vertical SaaS, no. The decision is constraint-driven, not preference-driven.

How long does it take to build a SaaS from scratch vs with a starter kit?

A 2-person team clocks 312 hours building a 5-feature SaaS from scratch (auth + Stripe + admin + blog + i18n). The same team ships the same spec on TanStack Ship in 50 hours + 18 hours of integration tax = 68 hours. The 244-hour delta at $50/hr blended rate is $12,200 of opportunity cost avoided.

What is the best SaaS starter kit for a 2-person team in 2026?

For edge deployment and type-safe TanStack: TanStack Ship at $299. For Vercel DX and community: ShipFast at $199. For B2B tenancy and Supabase: Makerkit at $279. For pre-MVP: Wasp Open-SaaS, free.

Do SaaS starter kits have a maintenance tax?

Yes. 4-8 hours per quarter on average for dependency upgrades and security patches. The Cloudflare Workers pricing has changed three times in two years; each change requires a runtime upgrade. Factor this into your ROI equation.

Can a 2-person team ship in 14 days with a starter kit?

Yes, with TanStack Ship or ShipFast. Most 2-person teams ship a 5-feature spec SaaS to first paying customer in 14-21 days with a paid kit, 28-42 days with a free one. The 2-4 week delta at $200/day revenue is $4,000-$8,000 of opportunity cost — that is the figure that justifies the license fee.

When does custom build beat a SaaS starter kit?

Custom build wins in four cases: highly vertical data models (healthcare, fintech, marketplace), regulated SaaS with audit requirements, teams that need to learn the stack deeply, and sub-$200/mo personal projects. For everything else, a paid kit pays back inside the first quarter.

What about a hybrid approach?

Hybrid (kit for the bottom 60%, custom for the vertical 40%) works when the kit covers your auth + billing + admin but your domain has a non-standard data model. Expect 70-100 hours of integration tax on top of the kit's deployment time. This is the path most vertical SaaS teams actually take.

Get started with TanStack Ship — clone the free starter, ship your 5-feature spec SaaS in 14 days. Try TanStack Ship →