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Internal tools · Portals · CRMs · Dashboards

Custom web apps without the SaaS bill

Off-the-shelf software is either too expensive or 90% wrong for how your team actually works. You need a portal, inventory UI, or tracker — not another monthly seat tax.

I build HtmlService web apps on Apps Script: Google SSO, Sheets as the database, zero hosting cost, and code you own.

Book a Free Tool AuditGet a Fixed-Price Quote
Fixed-scope quotes · From $500 · Within 24 hours · Deployed in your Workspace

By the numbers

$0Hosting / month
SSOGoogle login built in
From $500Fixed-scope projects
100%You own the code

Security & Privacy

  • Data sovereignty

    I never see your data. The script runs entirely within your Google environment.

  • Zero-access policy

    Limited-scope permissions—I only see what is necessary to build the tool.

Trusted to automate workflows involving

Google Sheets
Gmail
Google Drive
OpenAI
Gemini
Vertex AI
Stripe
Slack

SaaS seats add up. Spreadsheet chaos does not scale.

Teams either force a generic product into a custom process — or live in messy shared Sheets with no UI, no roles, and no guardrails.

  • Wrong-fit software: Paying for features you do not use while missing the one workflow you need.
  • Sheet as UI: Non-technical staff editing the wrong columns and breaking formulas.
  • No SSO story: Separate logins for every lightweight tool.
  • Vendor lock-in: Your process trapped in someone else's product roadmap.

If the data already lives in Sheets, the UI should too — with proper roles and validation.

Not sure if a web app or a script is enough?

On a free 30-minute audit I sketch the lightest tool that solves the pain — sidebar, web app, or automation-only — with a clear quote.

Book My Free Audit

What we build on Google Apps Script

Each app ships with Google SSO (or domain lock), Sheets CRUD, validation, and documentation so your team can run day two without me.

  1. 01 · PortalsReplace email chains with a portal

    Employee & client self-service

    Time-off, expenses, status lookups, and branded intake forms — Google SSO, no separate user database to babysit.

    See how it works →
  2. 02 · CRM / ops UIFit your process, not a SaaS template

    Custom CRM on Sheets

    Lead boards, stage changes, and notes in a clean UI that reads and writes your Sheet — without Salesforce pricing.

    See how it works →
  3. 03 · InventoryZero duplicate SKU chaos

    Stock intake & approvals

    Scan or enter SKUs, enforce validation, approve adjustments, and keep history in Sheets with a mobile-friendly UI.

    See how it works →
  4. 04 · DashboardsOne source of truth for the team

    Project & ops trackers

    Status, assignees, deadlines, and filters in one place — powered by Sheets and Apps Script, not another seat license.

    See how it works →

What you get out of it

$0 hosting

Runs on Google — no server bill

Google SSO

Domain-locked login, no extra accounts

You own the code

Extend it or hand to another dev later

Quote in 24 hrs

Fixed-scope quote after audit

Built in your Workspace — not a rented product

  • HtmlService UI: Responsive HTML/CSS/JS that feels like a real app.
  • Sheets as database: CRUD with validation, LockService for concurrent edits.
  • Role-based views: Admin vs staff screens without a separate auth product.
  • Optional APIs: Stripe, Slack, or your CRM wired in when the UI needs them.

From audit to deployed app in four steps

  1. Free tool audit (30 min): Users, permissions, Sheet model, must-have screens.
  2. Scope & quote (within 24 hours): Fixed-scope quote with wireframe-level clarity.
  3. Build & test: UI, backend, roles, edge cases, mobile checks.
  4. Deploy & handoff: Versioned deployment, docs, walkthrough, optional support.

Why teams hire AppScriptExpert for web apps

I design internal tools that non-technical staff actually use — with clean handovers and no hosting drama. Need a full CRM/ERP build? See custom CRM & ERP on Workspace.

Deliverables

What's included

Everything you need to run it on day one.

  • UI design in HtmlService (responsive HTML/CSS/JS)
  • doGet/doPost handlers with Google SSO and domain lock
  • Google Sheets as CRUD backend with validation
  • Role-based views and admin panels
  • Deployment configuration and documentation
  • Optional API integrations (Stripe, Slack, etc.)

Process

How it works

Five clear phases from first call to handoff.

  1. Step 01Free · 30 min

    Discovery call

    Map your workflow, data sources, and success metrics.

  2. Step 02No surprise fees

    Scope & quote

    Fixed-scope quote within 24 hours—projects generally start at $500.

  3. Step 03Your sandbox first

    Build & test

    Develop in your Google environment with edge-case testing.

  4. Step 04Full handoff

    Deploy & document

    Triggers, permissions, runbook, and handover walkthrough.

  5. Step 05Fixed packages

    Optional support

    Optional fixed-scope support packages as you evolve.

Focused portals often ship in 2–3 weeks; multi-role systems are scoped after the free audit.

By industry

Use cases by industry

Typical CRM and ERP builds mapped to real outcomes, not generic feature lists.

  • Field services

    Mobile data capture web app

    Outcome: Structured logs replace WhatsApp chaos

  • HR

    Employee self-service portal

    Outcome: Time-off and expense requests automated

  • Operations

    Inventory intake and approval UI

    Outcome: Zero duplicate SKU entries

  • Agency

    Client project tracker

    Outcome: Single dashboard, no extra SaaS

Comparison

Why Apps Script vs alternatives

Zapier and Make are great for quick connects. Custom Apps Script wins when logic, ownership, and Workspace depth matter.

Recommended

Google Apps Script

Cost model
$0 platform + build
Ownership
You own code
Best for
Workspace-native automation

Zapier

Cost model
$20–600+/mo
Ownership
Vendor logic
Best for
No-code quick wins

Make

Cost model
$9–299+/mo
Ownership
Vendor scenarios
Best for
Visual multi-app flows

Custom Apps Script build

Cost model
Fixed-scope project
Ownership
You own code
Best for
Custom complex logic

Compare in depth: Zapier alternative guide · Apps Script vs Zapier

“Clear communication, fixed-price quote in 24 hours, and we own every line of code. Exactly what we needed.”

Priya N., Founder, Logistics startup

Simple pricing

Normally starts at $500

Fixed-scope web app development packages—quoted by outcome after discovery. Entry work often starts around $500; larger builds are scoped higher.

Get a fixed-scope quote

Frequently asked questions

No. Google Apps Script Web Apps are hosted for free on Google's servers. This is a massive cost saving compared to traditional web development.

Yes. We leverage Google's built-in Identity and Access Management (IAM). You can restrict the app to specific users or anyone within your workspace domain.

It doesn't have to! I build custom HTML/CSS interfaces that look and feel like professional software, using your Google Sheet only as the "hidden" database.

Simple CRUD tools ship in 1–2 weeks. Multi-role portals with approvals typically take 3–4 weeks including testing and documentation.

Yes. Web apps can call Shopify, Stripe, Slack, and other APIs via UrlFetchApp while using Sheets as the data layer. See our API integration service for complex multi-system builds.

HtmlService web apps are responsive and work in mobile browsers. Users authenticate with their Google account, no separate passwords.

Ready for an internal tool that fits your process?

Book a free 30-minute audit. You leave with a recommended approach, timeline, and quote — usually within 24 hours.

Book Free Tool AuditRequest a Quote

Fixed-scope · From $500 · You own the code