a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This product is a two-sided marketplace app where sellers create and manage product listings and buyers browse products and place orders. Buyers can review their orders, while sellers can review and manage orders received for their listings. The MVP also gives administrators a way to review marketplace listings.
As an anonymous visitor, I can browse available marketplace listings and view product details
As a buyer, I can browse products and place an order
As a buyer, I can view my order history and order status
As a seller, I can create and manage my product listings
As a seller, I can view received orders and update their status
As an administrator, I can review marketplace product listings and update their review status
The following user counts are projected totals after one year of growth
100
administrators
Internal operators who review listings and maintain marketplace quality.
4900
sellers
Registered merchants who create listings and manage orders received from buyers.
5000
buyers
Registered customers who browse products and place marketplace orders.
1000
anonymous_visitors
Visitors who browse public marketplace listings without a registered account.
COST BREAKDOWN
How your requirements become a plan and a price
Momen doesn't give a vague quote: it first sizes the project's actual demand for each capability and resource, then costs each item out. The numbers in the 'Project demand' column below — their scale assumptions and derivations — are detailed in Scale & sizing
Minimum viable plan
BASIC
A production marketplace requires ongoing publishing, branded public access, multiple workflows, and product discoverability, all available from BASIC.
See the capability-by-capability assessment ▾
PROJECT DEMAND
ALLOWANCE PROVIDED (COMPOSITION)
AI points add-on
x 0
0 points
not purchased
(plan/kit 1.0M points)
No requirement
$ 0
Outbound data transfer add-on
x 0
0 B/mo
not purchased
(plan/kit 2.00 GB/mo)
No requirement
$ 0
Object storage
add-on
x 0
0 B
not purchased
(plan/kit 2.00 GB)
No requirement
$ 0
Database storage add-on
x 0
136.83 MB
not purchased
(plan/kit 200.00 MB)
Covered by plan/kit (margin ~46%)
$ 0
single-tenant kit
x 0
1 req/s
not purchased
(plan/kit 5 req/s)
Covered by plan/kit (margin ~400%)
$ 0
Basic
x 1
Basic is the minimum viable plan
Basic
(Plan tier: BASIC)
See minimum viable plan above
$ 39
plan + add-ons · usage-based · no development cost
WHY MOMEN
Your options for this project
In the table below, the 'monthly infrastructure' for the self-built / AI routes is derived from the AWS list prices shown below, sized against this project's actual usage. Figures cover infrastructure and operations only — AI usage is billed separately and excluded here, so they don't match the $39/mo all-in above.
Current usage sizing
AWS list pricing
0.00 GB (first 100GB free)
Internet egress → 0
0.00 GB-month
S3 Standard → 0
0.14 GB-month
RDS gp3 storage → 0.02
2 × db.m6g.large (Multi-AZ) × 730h
RDS PostgreSQL db.m6g.large → 232.14
2 × t4g.large × 730h
EC2 t4g.large → 98.11
Total ≈ $330.27 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $55,000 - $85,000
≈ $330
Based on the AWS estimate above
≈ $2,330
Infra $330 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $10,000 - $18,000
≈ $330
Based on the AWS estimate above
≈ $1,830
Infra $330 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $4,000 - $8,000
≈ $330
Based on the AWS estimate above
≈ $1,830
Infra $330 + ops ~$1,500
hours
3 / 5
Off-the-shelf SaaS / vertical solution
$0
N/A
Priced per seat, not by cloud infra
≈ $16,000+
Per-seat pricing, tens of thousands of users
days
1 / 5
Momen
Recommended
$0
$39
All-in: egress / storage / auto-scaling; excludes AI usage
$39
hours
5 / 5
Servers, databases, traffic and storage are inherent infrastructure costs for this project — you pay them whether you outsource, use Cursor or Lovable, or build it yourself (self-built runs ≈ $330.27/mo at AWS list prices, often more), on top of the dev and ops staff you'd need to hire. Momen bundles all of it into $0/mo all-in and removes the need for an ops team.
The frontend can be generated with AI tools (Cursor, Lovable, etc.); the hard part is the backend — auth, database, scaling, data security and ops. Momen delivers a production-grade backend as a BaaS: keep the vibe-coding speed on the frontend, while the backend runs on proven infrastructure — reliable, with no self-hosting or ops.
SCALE & SIZING
What scale this estimate assumes, and how the numbers are derived
Cost depends heavily on usage volume. First see the key assumptions and business scenarios this estimate uses, then the full calculation derived from each scenario for every resource — all adjustable to your real situation
We assume the product fits the multi-seller marketplace category, whose typical mature registered-account anchor is 10,000 when no explicit user figure or throughput signal is provided. We allocate that registration pool between buyers, sellers, and a small administrator group; if the marketplace has a stated order volume, seller count, or customer base, the estimate can be adjusted.
We assume this is a standard linear-growth marketplace product because no existing dataset, launch surge, or established operating history is described. If the app launches with a full pre-existing catalog or experiences a short promotional burst followed by a plateau, this parameter can be adjusted.
Routine Marketplace Use
Routine Marketplace Use
30
times/month
0.4 req/s
Peak load
We assume listing discovery and order-history checks occur in a broad daily period rather than being triggered by a shared external signal. This scenario groups those distinct purposes in the same routine period while keeping their audiences and core actions separate. The broad daytime and evening availability is represented by a 28,800-second window and daily occurrence across the month.
Main impact: Peak Concurrency
The scenarios above set the assumptions for each resource; below is the full calculation derived from them. Click to expand each item.
DEVELOPMENT SCOPE
How this app works
What exactly does this budget support? Broken down by business scenario, showing the pages, data tables, automation flows and AI assistant behind each one
An administrator reviews marketplace listings and updates their publication or review status.
Marketplace Home
users
A seller maintains product listings and reviews and updates orders received from buyers.
Marketplace Home
users
A registered buyer discovers a product, reviews checkout information, submits an order, and checks the resulting order history.
Marketplace Home
users
place_marketplace_order
An anonymous visitor browses available marketplace listings and opens a product detail page.
Marketplace Home
users
page
data_table
action_flow
Administrator Listing Review Page
Administrator queue for reviewing and updating seller product listings.
Seller Order Management Page
Seller page for reviewing and updating orders received from buyers.
Seller Listing Management Page
Seller workspace for creating, reviewing, and editing product listings.
Buyer Orders Page
Buyer order-history page showing submitted orders and their statuses.
Checkout Page
Checkout page where a buyer confirms product quantity and submits an order.
Product Detail Page
Detailed page for reviewing one marketplace product before purchase.
Marketplace Home
Public marketplace entry page showing available product listings.
FAQ
What you might want to know about this project
The Q&A below is generated by AI based on this project's type, features and scale
Are payments, notifications, or AI features included?
How reliable is the initial user-scale assumption?
Which marketplace features are included?
What will drive resource usage for this marketplace?
Copy to discuss with AI
Challenge & re-estimate
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