StacksVantage Technologies, LLC
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Related Products
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EternalEngine:
About
EternalEngineOS combines five business functions — CRM, invoicing, payments, booking, and email — in one app for solo founders and small service businesses. The one-person business back office: CRM, invoicing, payments, booking and email. Manage clients and contacts, send invoices and estimates, take payments, schedule bookings on your calendar, and send email — all in one place, without juggling five separate subscriptions. EternalEngineOS replaces the patchwork of separate CRM, invoicing, payment, booking and email tools with one simple app designed for one-person businesses. Free tier: $0, no credit card required. Basic: $9.95/mo flat with a 30-day no-card trial. Team $49/mo, Pro $99/mo, Business $199/mo. Built for solo founders and small businesses of every kind. Start free, no card. Basic is $9.95/mo when you're ready. Launched 3 months ago and in beta.
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Stacks:
About
Stacks is a hosted CRM and business workspace that brings customer records, sales pipelines, follow-up tasks, email campaigns, review requests, invoicing, appointment booking, support tickets and time tracking into one service. Shared customer records and activity history help solo operators, freelancers and small teams manage leads, sales, billing, bookings and customer support together. Users can maintain contacts and deals, create marketing emails, request feedback, issue estimates and invoices, publish availability, manage tickets, and track tasks and billable time. The core plan includes all seven modules for $0 per month with unlimited users and contacts. Free includes 50 one-time AI credits; an optional paid plan extends AI access. Businesses can connect their own Stripe account for payments and supported email providers for delivery. A REST API and MCP endpoint allow scoped access for software integrations.
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EternalEngine:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Stacks:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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EternalEngine:
Audience
Service businesses and small businesses
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Stacks:
Audience
Solo operators and small teams who want customers, sales, billing and bookings in one place, with room for their team and AI agents.
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EternalEngine:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Stacks:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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EternalEngine:
API
Offers API
Not Supported
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Stacks:
API
Offers API
Supported
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EternalEngine:
Screenshots and Videos |
Stacks:
Screenshots and Videos |
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EternalEngine:
Pricing
$9.95/month
Free $0 (no card, not a trial). Basic $9.95/mo flat, with a 30-day no-card trial. Team $49/mo. Pro $99/mo. Business $199/mo.
Free Version
Supported
Free Trial
Supported
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Stacks:
Pricing
$0/month
The Free plan costs $0 per month and includes all seven modules, unlimited users and contacts, and 50 one-time AI credits.
Free Version
Supported
Free Trial
Not Supported
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EternalEngine:
Reviews/
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Stacks:
Reviews/
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EternalEngine:
Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Stacks:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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EternalEngine:
Company InformationEternalEngine
Founded: 2026
United States
eternalengineos.io/basic/
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Stacks:
Company InformationVantage Technologies, LLC
Founded: 2026
stackscrm.com
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EternalEngine:
Alternatives |
Stacks:
Alternatives |
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Stacks:
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Stacks:
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EternalEngine:
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Stacks:
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EternalEngine:
Categories |
Stacks:
Categories |
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EternalEngine:
Business Management Features
Billing & Invoicing
Supported
CRM
Supported
Employee Management
Not Supported
Financial Management
Supported
Inventory Management
Not Supported
Marketing Management
Supported
Order Management
Not Supported
Point of Sale (POS)
Not Supported
Project Management
Not Supported
Purchasing
Not Supported
Scheduling
Supported
Time & Expense Tracking
Not Supported
Training Management
Not Supported
Vendor Management
Not Supported
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EternalEngine:
Integrations
Brevo
Not Supported
Model Context Protocol (MCP)
Not Supported
Resend
Not Supported
SendGrid
Not Supported
Stripe
Not Supported
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Stacks:
Integrations
Brevo
Supported
Model Context Protocol (MCP)
Supported
Resend
Supported
SendGrid
Supported
Stripe
Supported
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EternalEngine:
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Stacks:
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