a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
A marketplace app connects buyers with sellers who list products for discovery and purchase. Buyers can browse products, place orders, and review their order history, while sellers can create and manage listings and review incoming orders. Administrators can review marketplace listings and update their status.
As a buyer, I want to browse visible marketplace products so that I can discover items to purchase
As an anonymous visitor, I want to browse visible products so that I can evaluate the marketplace before registering
As a buyer, I want to view product details so that I can decide whether to buy an item
As a buyer, I want to place an order for selected products so that I can complete a marketplace purchase
As a buyer, I want to review my order history so that I can track my marketplace purchases
As a seller, I want to create a product listing so that buyers can discover my product
As a seller, I want to update my product listing so that its information remains current
As a seller, I want to view incoming orders for my products so that I can manage marketplace sales
As an administrator, I want to review marketplace product listings so that I can manage listing visibility
As an administrator, I want to update a product listing status so that unsuitable listings can be hidden
The following user counts are projected totals after one year of growth
500
administrators
Marketplace operators who review listings and maintain basic marketplace quality controls.
2500
sellers
Registered merchants who create and manage product listings and review incoming orders.
7000
buyers
Registered customers who browse products, purchase items, and review their own orders.
1000
anonymous_visitors
Visitors who browse visible marketplace products without signing in or placing orders.
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 purchases require payment capabilities available only in 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 8
323.14 GB/mo
500GB × 8/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +313.14 GB/mo)
Add-on fills +313.14 GB/mo gap beyond plan/kit
$ 23.33
Object storage
add-on
x 0
8.82 GB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~13%)
$ 0
Database storage add-on
x 0
137.32 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~628%)
$ 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 $122.33/mo all-in above.
Current usage sizing
AWS list pricing
85.51 GB (first 100GB free)
Internet egress → 7.7
8.82 GB-month
S3 Standard → 0.2
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 ≈ $338.17 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $75,000 - $130,000
≈ $338
Based on the AWS estimate above
≈ $2,338
Infra $338 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $12,000 - $22,000
≈ $338
Based on the AWS estimate above
≈ $1,838
Infra $338 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $4,000 - $8,000
≈ $338
Based on the AWS estimate above
≈ $1,838
Infra $338 + 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
$122
All-in: egress / storage / auto-scaling; excludes AI usage
$122
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 ≈ $338.17/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 is a two-sided marketplace with no stated user count or throughput. The marketplace category anchor is therefore used: a mature no-code or independent marketplace commonly has an order-of-magnitude registered base around ten thousand accounts, partitioned across buyers, sellers, and a small administrator group. If the business provides expected order volume, seller count, or a launch customer list, this estimate can be adjusted using those concrete signals.
We assume this marketplace follows a standard linear-growth pattern because no existing catalog, user base, or launch migration is described. Marketplace registration and listing activity typically build steadily during the first year rather than operating at full mature volume from the first day. If the app launches with a full pre-existing catalog and customer base, this assumption should be increased toward a full-year equivalent.
Routine Marketplace Browsing
Routine Seller Operations
Routine Marketplace Browsing
Routine Marketplace Browsing
30
times/month
0.33 req/s
Peak load
We assume product browsing is spread across the day rather than synchronized by an external signal, making an eight-hour active browsing window a more realistic representation than a short burst. The purpose separates buyer catalog discovery from the anonymous public path because their flows and account status differ. This scenario occurs daily, so it is represented thirty times per month. Product detail visits are a continuation for a subset of catalog visitors, not a separate synchronized event.
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 anonymous visitor browses visible products without creating an account or placing an order.
Marketplace Catalog Page
users
An administrator reviews product listings and changes the status of a listing when moderation is required.
Marketplace Catalog Page
users
A seller reviews listed products, creates or updates a listing, and checks incoming orders.
Marketplace Catalog Page
users
A buyer browses the marketplace, reviews a product, completes checkout, and later checks the purchase history.
Marketplace Catalog Page
users
place_marketplace_order
page
data_table
action_flow
Administrator Moderation Page
Administrator page for reviewing and changing product listing visibility.
Seller Order Management Page
Seller order page showing incoming purchases for the seller's products.
Seller Product Management Page
Seller workspace for viewing, creating, and editing product listings.
Buyer Orders Page
Order history page for a buyer's marketplace purchases.
Checkout Page
Checkout page where a registered buyer confirms an order.
Product Detail Page
Product detail page showing product information and the primary image before purchase.
Marketplace Catalog Page
Public catalog page showing visible marketplace products for discovery.
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 do product images affect usage?
How was the user scale estimated?
What features are included in the marketplace scope?
What will drive resource usage most strongly?
Copy to discuss with AI
Challenge & re-estimate
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