5 Next.js SaaS Templates Compared on Security [2026]

A Next.js SaaS template comparison in 2026 has to start with security architecture, not feature counts. The May 2026 Vercel security release patched thirteen Next.js advisories in a single coordinated update, including a Server Function deserialization DoS (CVE-2026-23870) and three middleware authorization-bypass flaws [4]. A template that ships with service_role keys in the browser bundle or RLS policies as the only defense layer is a template that loaded an active CVE class into your codebase on day one.

This post compares the five Next.js SaaS templates indie developers actually evaluate in 2026: ShipFast, MakerKit, Supastarter, Nextbase, and Divjoy. Each gets a fair read on what it ships, where it leads, and where it leaves you. The dimension that decides this comparison for us is security architecture, which is also the dimension most of these competitors say the least about.

TL;DR:

• All five paid options are one-time/lifetime in 2026. No active subscription kits in this set. Prices range from ~€349 (Supastarter Solo) to $199 (ShipFast Starter) for solo developer tiers.
• Feature coverage is roughly equivalent. Auth, payments, email, and a landing page ship with every option. Differences live in defaults: RLS posture, input validation, webhook signing, multi-tenancy.
• Security architecture is the gap most templates leave. Backend-only data access (no service_role near the browser), Zod on every Server Action, RLS deny-all defaults, and signed webhooks are not standard. They are usually optional, often missing.
• The "best" template is the one whose defaults match your priorities. Speed-to-launch (ShipFast), B2B multi-tenancy (Supastarter, MakerKit), or security-first architecture (SecureStartKit) are different optimization targets.
• The /compare pages on this site go deeper on each pair. This post is the overview; the /compare/* pages cover feature-by-feature differences.

Table of contents

• What dimensions matter when comparing SaaS templates in 2026?
• Side-by-side comparison: 5 templates plus SecureStartKit
• ShipFast: the indie speed-to-launch default
• MakerKit: the B2B multi-tenant workhorse
• Supastarter: the multi-framework multi-provider option
• Nextbase: the Supabase-anchored value pick
• Divjoy: the visual code generator
• Where SecureStartKit fits in this landscape

What dimensions matter when comparing SaaS templates in 2026?

Feature checklists ("auth, payments, email") are roughly tied across these five competitors. The dimensions that actually separate them in 2026 are upstream of the feature list:

• Default trust boundary. Does the template put database queries on the server only, or does it ship supabase.from('table').select() patterns directly inside 'use client' components? The Lovable breach that exposed 170+ apps in January 2026 happened in templates where the anon key plus permissive RLS was the only defense [5]. Backend-only data access removes that single point of failure.
• Input validation posture. Is every Server Action wrapped in a Zod safeParse before any database call? Or is validation an exercise left to the developer? Server Actions are public HTTP endpoints; an unvalidated payload is a CVE waiting for someone to find it [4].
• Webhook signing defaults. Stripe and Resend both sign their webhook payloads. A template that ships an example webhook handler without stripe.webhooks.constructEvent is teaching its users to ship a forgeable endpoint. Same for Resend.
• Multi-tenancy primitives. If the SaaS will have teams, organizations, or workspaces, the template's tenant primitives shape every later schema decision. Bolting multi-tenancy on later is a six-month refactor; getting it from the template costs ~$300.
• Pricing model. One-time vs subscription, per-seat licensing, source code access on day one vs through a portal. None of these are security questions, but they shape the upgrade cost when you find a problem later.
• Update cadence and security advisory response. Does the template ship a security update when Vercel ships a security update? May 2026 patched thirteen advisories at once; the templates that updated within a week and the templates that did not are now demonstrably different products.

The next section compares the five templates plus SecureStartKit across these dimensions side by side. Each competitor then gets a single-paragraph read with a deep-link to the per-pair /compare page for the longer treatment.

Side-by-side comparison: 5 templates plus SecureStartKit

Dimension	SecureStartKit	ShipFast	MakerKit	Supastarter	Nextbase	Divjoy
Price (solo)	$199 / $249	$199 / $249 / $299 [1]	$299 lifetime [2]	€349 lifetime [3]	$199 / $299 lifetime	Visual generator
Payment model	One-time	One-time	One-time	One-time	One-time + free OSS	One-time
Stack	Next.js + Supabase + Stripe	Next.js + MongoDB or Supabase	Next.js + Supabase or Drizzle or Prisma	Next.js, Nuxt, TanStack Start	Next.js + Supabase	Code generator (multi-stack)
Backend-only data access	Default and enforced	Optional	Optional	Optional	Optional	Depends on generated stack
Zod on every Server Action	Default	Optional	Service layer pattern	Optional	Optional	Not enforced
RLS posture	Deny-all defaults	Per developer	RLS + RBAC	RLS + RBAC	RLS + Supabase patterns	Depends
Signed webhooks	Always	Examples included	Examples included	Examples included	Examples included	Depends
Multi-tenancy	Single-tenant focus	Single-tenant	Workspaces + teams	Organizations + teams	Single-tenant	Configurable
Tests included	Vitest + Playwright (Pro)	Not included	Vitest + Playwright	Test setup included	Test setup included	Not included
Source on day one	Yes (GitHub)	Yes (GitHub)	Yes (GitHub)	Yes (GitHub)	Yes (GitHub + OSS lite)	Yes (export)

Three observations on the table. First, "optional" is doing a lot of work in the security architecture rows. Every template can be configured to do backend-only data access and Zod-everywhere; only one of them is configured that way out of the box. Second, the price spread between ShipFast Starter ($199) and Supastarter Solo (€349, ~$380) is real but small enough that it shouldn't drive the decision; the architectural defaults will dominate the total cost. Third, all of these are one-time purchases in 2026; there is no active subscription kit in the popular Next.js comparison set anymore.

ShipFast: the indie speed-to-launch default

ShipFast is Marc Lou's product, sold one-time at three tiers: $199 Starter, $249 All-in, and $299 Bundle (which adds the CodeFast course) [1]. Auth, payments (Stripe and Lemon Squeezy), database (MongoDB or Supabase), email (Mailgun and Resend), an SEO-optimized landing page, and a community come with every tier. Pay once, build unlimited projects.

Where ShipFast leads: time-to-first-paying-customer. The community is large, the documentation is opinionated, and the feature surface is intentionally narrow so a solo developer can ship in days. Marc's own product was famously launched in a weekend.

Where ShipFast leaves you: security architecture is not the optimization target. Backend-only data access is not a default; Zod-on-every-action is not enforced; multi-tenancy, RBAC, and tests are not included by design. ShipFast and SecureStartKit optimize for different things, and ShipFast wins on "speed to launch" while SecureStartKit wins on "what does the codebase look like six months in." We cover the full feature-by-feature contrast in the SecureStartKit vs ShipFast comparison.

MakerKit: the B2B multi-tenant workhorse

MakerKit's Next.js Supabase kit is $299 lifetime (Pro tier), with a Teams tier at $599 for up to five collaborators [2]. There are also Drizzle and Prisma variants at slightly higher prices. The platform has been shipping since 2022, which makes it one of the longest-running Next.js SaaS kits in the comparison.

Where MakerKit leads: code quality and B2B multi-tenancy. The kit ships with workspaces and teams as first-class primitives, a service layer with proper separation of concerns, 60+ Shadcn-based React components, and the rare distinction of including Vitest plus Playwright tests that actually run. Auth is the most complete: email/password, magic links, social OAuth across five providers, and TOTP MFA. If the SaaS is B2B and needs team scoping from day one, MakerKit is a strong default.

Where MakerKit leaves you: the breadth itself is the tradeoff. 60+ components and a plugin system are great for feature-complete coverage but generic by necessity. The opinionated security defaults that solve the most common Supabase failure modes (the architectural pattern, not the RLS policies) are not the kit's primary frame. The deeper feature-by-feature breakdown lives in SecureStartKit vs MakerKit.

Supastarter: the multi-framework multi-provider option

Supastarter ships at €349 Solo, €799 Startup (5 seats), and €1,499 Agency (10 seats), all one-time with lifetime updates [3]. Frameworks supported include Next.js (primary), Nuxt, and TanStack Start (beta). Auth is built on better-auth, with passkeys, 2FA, and OAuth. Five payment providers ship out of the box: Stripe, Lemon Squeezy, Polar, Creem, and Dodo Payments.

Where Supastarter leads: optionality. Five payment providers is unmatched in this comparison, and it solves a real problem (Stripe is unavailable in several markets, and switching billing providers later is a multi-week refactor). Multi-tenancy via organizations and teams, plus RBAC, plus an i18n setup out of the box, plus framework-agnostic support, makes Supastarter the natural pick for teams who can't predict the stack a year ahead.

Where Supastarter leaves you: the option count is also the cost. Five payment providers means more code paths to learn, more abstractions to understand, and more "depends on the provider" answers in the docs. The starting price is the highest in this comparison, and there is no CMS built in. The full breakdown is in SecureStartKit vs Supastarter.

Nextbase: the Supabase-anchored value pick

Nextbase ships a free open-source tier and a paid version at $199-$299 lifetime, anchored specifically on Next.js + Supabase. The free tier alone makes Nextbase the lowest-cost-of-entry option in this comparison; the paid tier adds documentation polish, additional components, and support.

Where Nextbase leads: documentation quality and the Supabase-first defaults. If the project is committed to Supabase as the backend, Nextbase's tutorials and examples are unusually thorough for the price point. The free tier is also a reasonable starting point for evaluating the architecture before paying.

Where Nextbase leaves you: it is single-tenant by default; multi-tenancy is not the design target. Security architecture beyond standard Supabase RLS examples is not the differentiator; the kit aims for "well-documented baseline" rather than "opinionated security-first defaults." The detailed contrast is in SecureStartKit vs Nextbase.

Divjoy: the visual code generator

Divjoy is structurally different from the others: it is a visual configurator that lets you pick a framework, UI kit (Tailwind CSS, Material UI, Bootstrap, Bulma), auth provider (Firebase, Supabase, Auth0), database, and payment setup through a point-and-click interface, then exports a codebase. The pricing model and feature set vary based on the export.

Where Divjoy leads: speed of initial setup when the requirements are fluid. If the SaaS hasn't decided between Firebase and Supabase yet, Divjoy lets the team change the answer without rewriting the boilerplate. For experiments and one-shot products, the generator can save days.

Where Divjoy leaves you: generated code rarely matches hand-written, opinionated patterns. The output is a starting point you maintain; updates from Divjoy don't merge back into your project automatically. Community activity around Divjoy has been minimal through 2025-2026, which matters when the underlying frameworks ship security patches. The full feature-by-feature look is in SecureStartKit vs Divjoy.

Where SecureStartKit fits in this landscape

SecureStartKit is $199 Starter and $249 Pro, one-time, Next.js + Supabase + Stripe only. The price sits in the same band as ShipFast Starter and the lower Nextbase tier. The optimization target is different: every architectural default is a security decision.

Backend-only data access is the structural commitment: the service_role key never enters the browser bundle, every database query runs in a Server Action through createAdminClient(), and Row Level Security ships with deny-all defaults so a missing policy fails closed instead of open. Zod runs on every Server Action via a safeParse at the top of the action, with parsed.data as the only input the action trusts. Webhooks always verify signatures before processing. The full architectural breakdown is in the security architecture most SaaS templates skip, and the deeper reasoning sits in why security-first matters for your SaaS.

The constraint: SecureStartKit makes the stack decision for you. Supabase, not Firebase. Stripe payment mode, not subscription. Single-tenant primary, not multi-tenant first. These are tradeoffs against the breadth options like MakerKit and Supastarter. The benefit is that every architectural decision is already aligned around the security frame: the backend-only data access pattern on the data layer, server-validated Zod schemas on the input layer, the 12-step hardening checklist on the deployment layer.

If the SaaS will handle user data, money, or anything that gets you on a CVE list when it leaks, the architectural defaults matter more than the feature checklist. See pricing for the two tiers, or read why we made these specific stack choices to decide whether the constraints fit.