Stacks

Stacks

Vantage Technologies, LLC
EternalEngine Stacks

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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.
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.
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
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
EternalEngine:

Audience

Service businesses and small businesses
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.
EternalEngine:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported
Stacks:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
EternalEngine:

API

Offers API Not Supported
Stacks:

API

Offers API Supported
EternalEngine:

Screenshots and Videos

Stacks:

Screenshots and Videos

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
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
EternalEngine:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
Stacks:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
EternalEngine:

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Stacks:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
EternalEngine:

Company Information

EternalEngine
Founded: 2026
United States
eternalengineos.io/basic/
Stacks:

Company Information

Vantage Technologies, LLC
Founded: 2026
stackscrm.com
EternalEngine:

Alternatives

Stacks:

Alternatives

EternalEngine:
Stacks:
EternalEngine:
Stacks:
Inklura

Inklura

Webdesign29
EternalEngine:
Stacks:
VODOO CRM

VODOO CRM

ALTIORAT
EternalEngine:
Atlas Solo

Atlas Solo

MARUPA
Stacks:
RentThisApp

RentThisApp

Rent This Ventures
EternalEngine:

Categories

Stacks:

Categories

CRM Supported
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
EternalEngine:

Integrations

Brevo Not Supported
Model Context Protocol (MCP) Not Supported
Resend Not Supported
SendGrid Not Supported
Stripe Not Supported
Stacks:

Integrations

Brevo Supported
Model Context Protocol (MCP) Supported
Resend Supported
SendGrid Supported
Stripe Supported
EternalEngine:
Claim EternalEngine and update features and information
Claim EternalEngine and update features and information
Stacks:
Claim Stacks and update features and information
Claim Stacks and update features and information