Stop Managing Your
Customers
With Fragmented Apps

In one week: get your custom business software
that unifies registration, payments, and data in your Google Sheet.

Google Sheet features

✓ Trusted by 100+ businesses • No coding required

Get Your Free Custom Plan

🔒 We'll send you a workflow plan based on your selections

How It Works

1
📋

We Help You Plan Your App

▼

Submit: Short questionnaire about who will use the app (other than admin) and what key tasks they need to perform

Receive (within 2 days): Detailed role journeys for admin, customers, and other users, plus screen-by-screen mockups

Review: You provide one round of comments, and we finalize the plan

2
🔨

We Build Your App

▼

We turn your approved workflow and screens plan into a fully functional working app

Timeline: Typically one week

3
🧪

You Test Your App

▼

You test the app on our Google Sheet. We fix all bugs and minor app definition adjustments with no limits.

4
🚀

We Help You Deploy the App

▼

After all tests pass, we copy the app to your Google Sheet

Support: We guide you step-by-step through the Google Apps Script deployment process

5
✨

Use Your App

▼

Using the Google web app URL, you access the admin portal with full control

User Access: The app automatically sends token URLs to each user for their personalized portals and screens

Automation: Everyone's actions update your Google Sheet automatically in real-time

What You Get

⚡
Google Sheet with app-level power
  • Fully customized to your workflow
  • Give partners their own portals to execute their operations, driven and tracked from your sheet
  • Let others collaborate on your data without exposing your full sheet
  • Send payment requests from Google Sheets and track incoming payments
  • Collect signatures without DocuSign
🔄
Turn forms into automated workflows
  • Forms auto-update when your sheet changes (new pricing, new dropdown options, new products etc.)
  • Forms can update existing records, not just create new rows
  • Forms in a Multi-step workflow adjust to answers in previous steps
👥
Collaboration Without the Chaos
  • Custom views for different user types (clients, vendors, team members)
  • No risk of broken formulas or accidental deletions
  • Multiple people can update their information at the same time
🛡️
Risk-Free Development
  • We help you plan exactly what you need before building
  • Built on proven, maintainable code (not fragile AI-generated output)
  • Unlimited bug fixes included
  • Transparent, flat-rate pricing
💰
Affordable Custom Apps
  • $25per screen (includes 2 revisions)
  • $5-45per month support
  • Working app ready in one week
  • Your data is always accessible in your Google Sheet
  • No vendor lock-in—standard JavaScript any developer can maintain
⏱️
Save Time
  • Delegate data entry to the right people
  • Automated workflows and notifications
  • Validation prevents errors
  • Never miss process steps
🚀
Easy to Adopt
  • Fully customized to your workflow
  • Familiar Google Sheets interface
  • Free templates available
  • Full mobile functionality

Try a Demo in Action

Each template demonstrates different capabilities and can be customized to fit your needs.

Signature Management

Signature Management for Google Sheets

Digital signature solution integrated with Google Sheets - no need for expensive DocuSign

Google Sheet Admin Portal Member Portal
Product Sales

Product Sales for Google Sheets

Sell products directly through Google Sheets with payment processing and inventory tracking

Google Sheet Admin Portal Role Portal
Customer Management

Customer Management for Google Sheets

Organize and manage customer information with portals, activity tracking, and relationship management

Google Sheet Admin Portal Role Portal
Invoice Payment

Invoice and Get Paid with Google Sheets

Create invoices and process payments with automated reminders to get paid faster

Google Sheet Admin Portal Role Portal

Simple, Transparent Pricing

Personal Gmail (@gmail.com)

$5/month
  • ✓ Template Fees: $0
  • ✓ Tailored App Development: Schedule Consultation (starting at $25/screen)
  • ✓ Support: Email
  • ✓ Trial Period: 1 Month
  • ✓ Payment processing via Stripe — no markup

Perfect for individuals and small teams

POPULAR

Google Workspace (Custom Domain)

$45/month
  • ✓ Template Fees: $0
  • ✓ Tailored App Development: Schedule Consultation (starting at $50/page design)
  • ✓ Support: Phone, Email
  • ✓ Trial Period: 1 Month
  • ✓ Payment processing via Stripe — no markup

Ideal for businesses needing phone support

What You Can Build

📊
Sales and Inventory Tracking
🧾
Invoicing and Billing
💰
Most Popular
Payment Collection
📈
Expense Tracking
👥
Customer CRM
🏢
Supplier Portals
🤝
⭐ Top Choice
Team Collaboration
⏱️
Time Tracking
🎯
⚡ Rising
Employee Onboarding
✍️
🔥 Trending
Document Signing
🎫
Event Registration
⚙️
Workflow Automation
📅
Resource Scheduling
🙋
Volunteer Coordination
💝
Donor Relations
📋
Project Tracking

FAQ - Frequently Asked Questions

▼

What is Centask?

Centask builds custom apps that automate your business processes using Google Sheets as the database. We transform your Google Sheets into powerful business applications.

Do I need coding experience?

No. We build the app for you. You just describe your workflow or choose a template, and we handle all the technical development.

How does the process work?

1) You choose a template or describe your workflow, 2) We build your app, 3) You test it, 4) We deploy it to your Google Sheet, 5) You start using it with your team.

How long does it take to build an app?

Template-based apps can be ready in days. Custom apps typically take 2-4 weeks depending on complexity. We'll provide a timeline during consultation.

What types of apps can I build?

You can build apps for customer management, invoicing, payments, document signing, team management, inventory tracking, and much more. See our Use Cases section for examples.

What if I need changes after the app is built?

We offer revision packages ($25 for 3 revisions per screen). You can also customize using our JavaScript libraries at no charge, or schedule additional development.

Can I customize the app later?

Yes. You have access to Centask libraries in Google Apps Script JavaScript to customize functionality at no charge. We also offer paid customization services.

What's included in the monthly subscription?

The monthly subscription covers hosting, support, and access to updates. Template fees are one-time. Custom development is priced separately.

Are there fees for processing payments?

No. We don't charge any fees on top of Stripe's standard processing fees. Payments are processed securely through Stripe, and you only pay Stripe's standard rates (typically 2.9% + $0.30 per transaction). There are no Centask fees for payment processing.

Is my data secure?

Yes. Your data stays in your Google Sheet, protected by Google's security. We use role-based permissions to control access, and all data handling follows industry-standard security practices.

Do I own the app?

Yes. The app is built in your Google Sheet using Google Apps Script. You own everything - the code, the data, and the app functionality.

Get Your Free Custom Plan

🔒 We'll send you a workflow plan based on your selections