a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This product is a marketplace app supporting 300 sellers and their buyers. Sellers can publish products with images and manage incoming orders, while buyers and anonymous visitors can browse the catalog, view product details, place orders, and review order history.
As an anonymous visitor, I can browse the public marketplace product catalog and view product details
As a buyer, I can browse products and view product images and details
As a buyer, I can place an order for marketplace products
As a buyer, I can view my order history and order statuses
As a seller, I can publish products with product images
As a seller, I can view and update orders for my products
As a marketplace operator, I can review the marketplace catalog and order records for basic oversight
The following user counts are projected totals after one year of growth
10
marketplace_operators
A small internal group responsible for basic marketplace account and catalog oversight.
300
sellers
The 300 registered sellers who publish products and manage orders for their own listings.
9690
buyers
Registered customers who browse products, place marketplace orders, and review their own order history.
1000
anonymous_visitors
Visitors who browse public marketplace listings and product details 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
PRO
Marketplace product purchases require payment capabilities available only on PRO.
See the capability-by-capability assessment ▾
PROJECT DEMAND
ALLOWANCE PROVIDED (COMPOSITION)
AI points add-on
x 0
0 points
not purchased
(plan/kit 5.0M points)
No requirement
$ 0
Outbound data transfer add-on
x 1
51.37 GB/mo
500GB × 1/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +41.37 GB/mo)
Add-on fills +41.37 GB/mo gap beyond plan/kit
$ 2.92
Object storage
add-on
x 0
2.36 GB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~323%)
$ 0
Database storage add-on
x 0
116.61 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~758%)
$ 0
single-tenant kit
x 0
1 req/s
not purchased
(plan/kit 25 req/s)
Covered by plan/kit (margin ~2400%)
$ 0
PRO
x 1
Pro is the minimum viable plan
Pro
(Plan tier: PRO)
See minimum viable plan above
$ 99
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 $101.92/mo all-in above.
Current usage sizing
AWS list pricing
0.00 GB (first 100GB free)
Internet egress → 0
2.36 GB-month
S3 Standard → 0.05
0.12 GB-month
RDS gp3 storage → 0.01
2 × db.m6g.large (Multi-AZ) × 730h
RDS PostgreSQL db.m6g.large → 232.14
2 × t4g.large × 730h
EC2 t4g.large → 98.11
Total ≈ $330.32 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $90,000 - $160,000
≈ $330
Based on the AWS estimate above
≈ $2,330
Infra $330 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $14,000 - $24,000
≈ $330
Based on the AWS estimate above
≈ $1,830
Infra $330 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $6,000 - $10,000
≈ $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
$102
All-in: egress / storage / auto-scaling; excludes AI usage
$102
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 ≈ $330.32/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 marketplace category anchor of roughly 10,000 registered accounts because no buyer count or transaction throughput was provided. The stated 300 sellers are included as a defined seller population, with the remaining registered pool assigned to buyers and a small operational account allowance; this can be adjusted when buyer or order volumes are known.
We assume this is a standard linear-growth marketplace that starts with sellers and gradually accumulates buyer activity because a marketplace typically builds its catalog and customer base over time. If the app launches with a full pre-existing catalog and customer dataset, this equivalent operating period can be increased to the full year.
Routine Marketplace Browsing
Routine Marketplace Browsing
Routine Marketplace Browsing
Routine Marketplace Browsing
30
times/month
0.4 req/s
Peak load
We assume catalog discovery happens throughout the day rather than at a synchronized signal, so this is modeled as a broad eight-hour routine scenario with 30 daily occurrences per month. Public browsing and signed-in buyer discovery are separate purposes because the groups enter through different access states, even though both use the catalog. The head counts represent people active during the period, not a simultaneous launch burst.
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
Anonymous visitor browses the public marketplace catalog and views product information without ordering.
Marketplace Home Page
users
Buyer browses products, opens a product detail, checks out, and reviews the resulting order.
Marketplace Home Page
users
create_product_listing
Seller reviews incoming orders and updates an order's fulfillment status.
Marketplace Home Page
users
Seller publishes a product listing and reviews the seller's current catalog.
Marketplace Home Page
users
create_product_listing
page
data_table
action_flow
Marketplace Operations Page
Basic operational overview of marketplace products and orders.
Seller Order Management Page
Seller order queue for reviewing and updating order statuses.
Seller Product Management Page
Seller interface for reviewing and publishing product listings.
Buyer Order History Page
Buyer view of previous orders and their statuses.
Buyer Checkout Page
Buyer checkout page for confirming a marketplace order.
Marketplace Home Page
Public marketplace catalog and product discovery page.
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
How does supporting 300 sellers affect the estimate?
Can users browse without registering?
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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