Custom Web Development

Custom web development, engineered around your business — not a template

We design and build bespoke websites, web apps, SaaS platforms and portals from the ground up — and rebuild the ones you've outgrown. Code that fits exactly how you work, scales as you grow, and that you own outright.

Build from zeroNew app, SaaS, portal or platformRebuild what existsModernize or replatform, no downtime
Custom app interface previewIMG 01 · HERO · CUSTOM APP UI · BLANK SCREEN FOR SCREENSHOT
100% code ownershipOpen standards · your repo
AI-ready by designAPI-first · clean data
0Downtime on rebuilds

TRUSTED BY TEAMS THAT SHIP

ISO 27001 Certified
SOC 2 Type 2
PCI DSS Compliance
GDPR Compliance
CCPA Compliance
ISO 27018 Certified

“We follow the principles of GDPR, CCPA, and are ISO standards certified to ensure security, privacy, and compliance across all operations.”

01 — The plain-language version

What custom web development actually means

Custom web development is building a website or web application from scratch — coded to your specific operations, brand and growth plan — instead of relying on a template, page builder or off-the-shelf product. A template gets you live quickly; a custom build is engineered around your business logic, so it bends to your needs rather than forcing your needs to bend to it.

Template / builder

Renting a shape that almost fits

Fast to launch and inexpensive — but you customise within someone else's limits. When your logic, integrations or scale outgrow the box, you hit a wall you can't move.

Custom build

Owning one built to measure

Full control over functionality, integrations, performance and the data you hold — and a foundation you can add to for years without starting over. You own the code outright.

What we build:

Custom web apps & SaaS Customer & partner portals Custom e-commerce logic API & systems integration Headless & composable Progressive web apps Custom CMS & admin
02 — Honest decision guidance

When custom is the right call — and when it honestly isn't

Most agencies will tell you to build custom no matter what. We won't. The smartest spend depends on your stage — and getting it wrong is how teams end up with technical debt, a tool they outgrow in 18 months, or a six-figure build they didn't need. Answer three questions for a straight recommendation, then check it against the full comparison.

A 20-second gut-check. Your answers stay in your browser — nothing is sent anywhere.

1 · What are you building?

2 · How complex is the logic?

3 · Is owning the code important?

Our honest take

Answer the three questions →

We'll give you a straight recommendation — even when that's don't build custom yet. No agency hard-sell.

How custom development compares with templates and no-code — an honest, at-a-glance guide.
FactorCustom buildTemplate / builderNo-code / low-code
Best forProducts, complex logic, scaleSimple marketing & content sitesValidating ideas, internal tools
Time to first launch Weeks–months Days Days–weeks
Upfront cost Higher Low Low–medium
Custom logic & integrations Unlimited Limited Constrained
Scales with you By design To a point Hits a ceiling
You own the code 100% yours Usually not No
Risk of outgrowing it Low High once specific High at scale

A common smart path in 2026: validate with no-code, then build custom once it's proven. The honest question isn't "which is fastest?" — it's "which parts of this can I afford not to own?" If a template or builder is genuinely the better, faster, cheaper answer, our WordPress, Webflow or Shopify teams will point you there.

03 — Build or rebuild

Two doors, one team: build new, or rebuild what you've outgrown

Roughly half of what we do is building from zero. The other half is rebuilding what companies have outgrown. We're genuinely expert at both — so you never have to pretend your starting point is something it isn't.

Build from zero custom developmentIMG 02 · DOOR · BUILD FROM ZERO · 16:10
Door one · Start from zero

Build something new

A new web app, SaaS product, portal or platform, engineered for the long run. We start from your idea or your napkin sketch, pressure-test the scope before a line of code is written, ship a focused MVP fast, then grow it on a foundation that won't need ripping out.

  • Scope pressure-tested before code
  • A focused MVP, shipped fast
  • A foundation built to scale, not redo
Plan a new build
Modernized custom platform after rebuild
Legacy system before modernization
BeforeAfter
Door two · Improve what exists

Rebuild & modernize what you've outgrown

This is where most agencies go quiet — and where a lot of our work lives. We are experts in redesign and redevelopment. Trapped in a website builder, sitting on a slow legacy application, locked into a proprietary CMS, or staring at a stalled build someone else abandoned? We modernize it without a risky big-bang rewrite.

  • Replatform off a builder or closed CMS
  • Untangle a slow monolith, no downtime
  • Rescue a stalled or abandoned build
Audit my existing site or app

How we rebuild safely — without a big-bang rewrite

Big-bang rewrites are how modernization projects die. We migrate incrementally, in production, so your operation never stops. Here is the pattern we use and the four commitments behind it.

Phase 1 · TodayPhase 2 · MigratingPhase 3 · Modernized100% traffictraffic split, shifting100% trafficLegacymonolithLegacy(shrinking)New service ArouterService AService BService CProduction never stops — new services replace the old one piece by piece.
1Audit first.We map what's worth keeping, what's holding you back, and the real dependencies underneath.
2The right move per system.The industry's 7 Rs — rehost, replatform, refactor, rearchitect, rebuild, repurchase or retire. Most programs use several.
3Business logic preserved.Old systems hold rules nobody fully remembers — we surface and protect them instead of breaking them.
4A pragmatic target.Often a clean modular monolith over premature microservices — separation without needless operational overhead.

Both doors imply their own audit — of an existing site or app, or of a concept — but it's one expertise expressed two ways, never a separate service line. Audit my existing site or app — free →

Services

Custom software built around your problem, from a first MVP to enterprise scale.

Whatever you are building, we scope it honestly and tell you plainly when a lighter or cheaper option fits better. Choose the capability that matches where you are.

Custom SaaS Development

Custom SaaS development: a multi-tenant subscription product built from scratch, with billing, tenant isolation, and an admin panel.

MVP Development

MVP development that builds a lean, launchable first version to validate real demand before you invest in the full product.

Custom API Development and Integration

Custom API development and integration: REST, GraphQL, or gRPC services plus connectors that wire your systems together.

Enterprise Software Development

Enterprise software development for secure, scalable internal platforms that integrate with your ERP, CRM, and existing systems.

Legacy Software Modernization

Legacy software modernization that refactors, rearchitects, or replatforms aging systems to cut risk, without breaking daily operations.

Custom Internal Tools and Business Software

Custom internal tools and business software that replace spreadsheets and SaaS sprawl with apps shaped around your workflow.

Cloud and DevOps Engineering

Cloud and DevOps engineering: CI/CD pipelines, infrastructure as code, and monitoring so you ship faster and run reliably.

Dedicated Development Team and Staff Augmentation

Dedicated development teams and staff augmentation: vetted engineers who work in your process, scaling as your roadmap changes.
05 — How we engineer it

The stack, chosen for your job — not our habit

There's no single "best" stack — there's the right one for your goals, your team and your 24–36-month roadmap. We pick deliberately and tell you why. Every build ships engineered for Core Web Vitals, technical SEO, security and accessibility from the first sprint — not bolted on before launch.

Front end

What users touch
Next.jsReactVueSvelteKit

The 2026 default for production web apps and SaaS, with server rendering and SEO built in — Vue or SvelteKit where they fit better.

Back end

Logic & APIs
Node.js / NestJSDjangoLaravel.NETSpring Boot

Node for real-time, API-heavy apps; Django for data- and AI-heavy products; Laravel for fast full-stack; .NET and Spring Boot for regulated, enterprise-grade systems.

Data

Where it lives
PostgreSQLMongoDB

PostgreSQL as the reliable default, MongoDB where document models earn their place.

Architecture

How it's shaped
Modular monolithHeadless / composableMicroservices

Headless where it adds flexibility; a clean modular monolith or microservices chosen on merit, never on hype.

Cloud & delivery

How it ships
AWSGoogle CloudVercelCI/CD

With CI/CD, automated testing and observability so releases are safe and frequent.

Representative production stack — modern, well-supported tooling
TSnode.NET
IMG 05 · CRAFT CLOSE-UP · 3:2
Engineering stack and architecture planningConcept close-up: clean code in a modern editor, or an architecture sketch, shallow focus, calm and premium
Chosen for the long run

A stack you can still hire for in five years

We pick proven, well-supported tools on purpose: easy to staff, easy to maintain, and stable long after launch, so your build keeps paying off.

The Web × AI advantage

AI-accelerated to build — AI-ready by design

AI changes custom development in two ways, and we use both. Modern AI-assisted engineering compresses the repeatable work — scaffolding, tests, migrations, refactors — so timelines land materially faster. You get the speed buyers love about no-code, without the ceiling, the lock-in, or losing ownership of your code.

  • Faster to build — repeatable work compressed, delivery materially quicker
  • AI-ready by design — API-first, clean data boundaries and event streams
  • No re-platform later — add intelligent features on a foundation already built for them

Want AI woven deeper — agents, chatbots, automations, custom models? Our dedicated AI Automation team builds it as part of the same accountable engagement. We build on leading AI models, including as an Anthropic partner — a partnership, not a dependency, never "developing under" anyone.

06 — No lock-in, ever

You own 100% of the code. Always.

Here's the question most buyers forget to ask until it's too late: who owns what you paid for? Plenty of agencies build on proprietary, closed platforms — and the moment you want to change something, you're back at their door, on their rate and their timeline. Some can't even hand over the code. We work the opposite way.

The lock-in trap

  • Built on a proprietary, closed CMS you can't leave
  • Every change goes through them, at their rate
  • Hidden white-label markup in the bill
  • Sometimes, no way to get the source at all

The 10Turtle way

  • Full source code, on open standards, in your repository
  • Documented and deployable anywhere
  • No proprietary CMS · no hostage situation
  • Want to take it elsewhere? You can. We earn the relationship

Ask us anything — free audit

IMG 06 · ENGINEERING / HANDOVER · cover
Open code handover and ownershipFull-bleed: a developer handing over a clean, open codebase on screen, warm and human real workspace
Built in the open

We build it in the open, then hand you every line.

Open standards, your repository, full documentation. The opposite of a proprietary platform you can never leave.

See how we would build yours
07 — How a build runs

How a custom build runs with 10Turtle

Most failed projects fail before the first sprint — in fuzzy scope and skipped phases. Our process is built to prevent exactly that.

Phase 01

Audit & discovery

We map your workflows, pain points, data and — if you're rebuilding — your existing system. The deliverable is clarity: what to build, what not to build, and why.

Output: clarity & a real dependency map
Phase 02

Scope & architecture

Tight, written scope; the right stack and architecture; a realistic budget and timeline you can hold us to. Vague briefs are where the 10× cost-blowouts come from — we kill ambiguity here.

Output: a scope & budget you can hold us to
Phase 03

Design & build

Dedicated specialists design the experience and engineer it in short, demoable iterations — with QA, accessibility and Core Web Vitals checked continuously, not at the end.

Output: working software, demoed each iteration
Phase 04

Launch & support

Safe, staged release; performance and security hardening; then ongoing maintenance, monitoring and enhancements under a clear SLA. Software is never "done" — and we don't disappear at launch.

Output: a safe launch & an SLA, not a vanishing act
IMG 07 · BUILD IN PROGRESS · 4:3
Custom software build in progressA real engineering moment: a clean dashboard taking shape on screen, pair-programming, warm studio light
0Downtime on a phased rebuild, by design
Engineering, not guesswork

You watch it take shape, sprint by sprint

Short, demoable sprints mean you steer the product early instead of waiting months for a big reveal that misses. Clear scope up front, working software at every step.

Map your build
08 — Cost & timeline

What custom web development costs — and how long it takes

No honest agency can quote you blind — the single biggest driver of cost is how precisely the scope is defined. But you shouldn't plan in the dark either. Drag the slider to see realistic 2026 market ranges by complexity.

MVPStandardSaaSEnterprise
Simple / MVP

Internal tool or MVP

$15K–$40K
≈ 6–10 weeks

Best for validating an idea or a contained internal tool with a small user base.

  • Focused scope, core workflows
  • Ship fast, prove the concept
Matches your selection
Standard

Multi-role app or portal

$50K–$150K
≈ 10–16 weeks

Best for client-facing apps and portals with several user roles and real integrations.

  • Role-based access & dashboards
  • CRM / ERP / payment integration
Matches your selection
Complex

SaaS platform

$150K+
≈ 16–24 weeks

Best for products with multi-tenancy, billing and scale designed in from day one.

  • Multi-tenancy & billing
  • Built to scale from launch
Matches your selection
Enterprise / regulated

Enterprise build

$200K–$500K+
≈ 24–40+ weeks

Best for regulated, auditable, integration-heavy systems in finance, health and beyond.

  • Compliance & audit trails
  • Enterprise security & SLAs
Matches your selection
Market reference, not a quote. Clutch's 2026 verified data puts the average custom software project near $132K over ~13 months * — useful context only.
Plan for ongoing costs. Hosting, third-party APIs and maintenance typically run 15–25% of the build per year.
AI is bending timelines down. AI-assisted engineering is compressing these ranges materially on the repeatable work.

Get a scoped estimate — free audit Figures are 2026 market ranges * — your audit converts them into a real, scoped number.

The 10Turtle model

One accountable partner, a dedicated expert team for your build

You don't want a generalist who dabbles, and you don't want five vendors pointing fingers. With 10Turtle you get both depth and reach: one accountable partner under one roof, with a dedicated expert team for each capability.

  • A dedicated web & engineering team for your build — design, build, ship, maintain.
  • A dedicated branding team for how it looks and feels, and a dedicated AI team for what it can automate.
  • No outsourcing, no white-label markup — your build never falls between the cracks of separate suppliers.
10Selected work

Custom builds, shipped

Real builds, real outcomes. Numbers are added as each case study is verified and connected post-launch — we never publish placeholder figures as fact.

11 — In their words

What clients say about building with us

Written, audio and video, because trust reads differently in each.

Platforms we build on

Peer partnerships across the platforms we build on

We build on Anthropic’s models as a partner, not a dependency — never under or through Anthropic. Partner statuses and exact tiers (including any WooCommerce / Automattic agency tier) are pending owner verification.

Built secure by default

Built secure, accessible and compliant — by default

Security and compliance aren't an add-on; they're how we build, and proof of how we'll treat your users' data. It's both an expertise we bring to your project and a promise about how we operate.

ISO 27001 *Information securitySOC 2 *Controls & trustWCAG 2.1–2.2 AA / ADAAccessible & AI-visibleGDPR · CCPA · PCI DSSPrivacy & paymentsSecure SDLC / OWASP *Dependency hygieneQA licenses *Tested before ship

Standards marked * are pending verification of active certification. Talk security & compliance — free audit →

12 — Questions

Straight answers

The questions buyers — and AI assistants — ask before shortlisting a custom development partner.

Custom web development is building a website or web application from scratch — coded to your specific operations, brand and growth plan — rather than using a template, page builder or off-the-shelf product. It gives you full control over functionality, integrations, performance and data, and a foundation you can extend for years.

A template or builder gets you live quickly using pre-built layouts, but limits how far you can customize logic, integrations and scale. A custom build is engineered around your business, so it adapts to your needs instead of forcing your needs into a fixed shape — and you own the code outright.

Build custom when your software is a core product or competitive edge, you have complex logic or compliance requirements, brand and performance matter, you need to scale, or vendor lock-in is a real risk. A template suits simple marketing sites; no-code suits validating ideas and contained internal tools. A common path is to validate with no-code, then build custom once it's proven.

As a planning guide: a simple tool or MVP runs roughly $15K-$40K; a standard multi-role app or portal $50K-$150K; a complex SaaS platform $150K+; and enterprise or regulated builds $200K-$500K+. The biggest cost driver is how precisely the scope is defined. A free audit converts these ranges into a scoped estimate for your project.

Typical timelines: simple internal tools 6-10 weeks; standard multi-role apps 10-16 weeks; complex SaaS platforms 16-24 weeks; enterprise builds 24-40+ weeks — including discovery, design, build, testing and launch. AI-assisted engineering is shortening these materially.

You own 100% of the source code. We build on open standards, document it, and hand it over in your repository — no proprietary CMS, no lock-in, no white-label markup. If you ever want to take it elsewhere, you can.

Yes — it's a core part of what we do. We audit what's worth keeping, choose the right modernization move (the 7 Rs), and migrate incrementally using the strangler-fig pattern so there's no downtime and no risky big-bang rewrite — preserving the business logic buried in your current system.

Whatever fits your goals, team and roadmap — we choose deliberately. Common picks: React/Next.js on the front end; Node.js/NestJS, Django, Laravel, .NET or Spring Boot on the back end; PostgreSQL for data; headless or modular-monolith architecture; and AWS, Google Cloud or Vercel for hosting — all with Core Web Vitals, security and accessibility built in from the start.

Yes — those aren't add-ons. Every build is engineered for Core Web Vitals and technical SEO, secured to ISO 27001-aligned practices, and built to WCAG 2.1-2.2 AA accessibility, with GDPR/CCPA/PCI DSS readiness where relevant. Security is engineered in through a secure SDLC with OWASP-aligned practices and dependency and supply-chain hygiene.

Yes on both. We architect API-first with clean data so you can add AI and agentic features later without re-platforming, and we build with the structure, schema and trust signals that make sites visible to AI search engines — increasingly how B2B buyers shortlist vendors.

We don't disappear. You get a staged launch, performance and security hardening, then ongoing maintenance, monitoring and enhancements under a clear SLA. Budget roughly 15-25% of the build per year for hosting, third-party services and upkeep.

Start with a free, no-obligation build audit. We review your idea or your existing system and return a clear recommendation, a realistic scope and a budget you can plan around.

IMG 20 · PRE-CTA / OPERATOR MOMENT · cover
Operator using custom software in productionFull-bleed: a confident operator using a polished custom app on a laptop, optimistic and forward-looking
Your move

Build something you own, and never outgrow.

Start with a free build audit. We will tell you honestly what to build, what to keep, and what it should cost, before you commit a dollar.

Get your free build audit
Start here

One free build audit. Zero obligation.

The fastest way to find out the honest path for your project — and whether we're the right fit. No pitch deck, no pressure.

What you get

A specific, scoped recommendation — not a sales call in disguise.

  • An honest build-or-not call — custom, template or no-code, with the reasons.
  • A realistic scope & budget — your ranges turned into a real number.
  • A stack & architecture sketch — what we'd build, and why.
  • If you're rebuilding — a safe, zero-downtime migration plan.

How it works

1Tell us what you're buildingYour idea, your existing system, and what "done right" means to you.
2We audit itYour dedicated team reviews it against real benchmarks and the build-vs-buy line.
3You get the planA clear recommendation, scope and budget — yours to keep, hire us or not.
Get your free build audit

No spam. No obligation. No lock-in. Your details stay private.

One roof. One standard.

Tell us what you're building. We'll tell you the honest path.

Whether you're starting from a blank page or rescuing something that's holding you back, the first step is the same — and it's free. We review your idea or your existing system and come back with a clear recommendation, a realistic scope, and a budget you can plan around. No pressure, no jargon, no lock-in.