a multi-seller marketplace app
PROJECT OVERVIEW
What this app does
This marketplace app connects buyers with multiple sellers through searchable product listings and product detail pages. Sellers can create and maintain listings, buyers can place paid orders and review order history, and marketplace administrators can perform basic listing review while sellers process purchased items.
As an anonymous visitor, I can browse marketplace listings and view product details
As a buyer, I can browse marketplace listings and inspect individual products
As a buyer, I can place an order and begin payment for a selected product
As a buyer, I can review my marketplace order history and current order states
As a seller, I can create and update marketplace product listings
As a seller, I can view purchased order items and update their fulfillment state
As a marketplace administrator, I can review and approve or reject seller-created listings
The following user counts are projected totals after one year of growth
1000
anonymous_visitors
Public visitors who can browse listings and product details without an account.
9000
buyers
Registered customers who browse listings, pay for purchases, and review their orders.
950
sellers
Registered merchants who create listings and process purchased order items.
50
marketplace_administrators
Internal staff who review seller-created listings and maintain basic marketplace quality.
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 order payments require at least the PRO plan.
See the capability-by-capability assessment ▾
PROJECT DEMAND
ALLOWANCE PROVIDED (COMPOSITION)
PRO
x 1
Pro is the minimum viable plan
Pro
(Plan tier: PRO)
See minimum viable plan above
$ 99
single-tenant kit
x 0
2 req/s
not purchased
(plan/kit 25 req/s)
Covered by plan/kit (margin ~1150%)
$ 0
Database storage add-on
x 0
407.73 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~145%)
$ 0
Object storage
add-on
x 0
7.80 GB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~28%)
$ 0
Outbound data transfer add-on
x 19
773.99 GB/mo
500GB × 19/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +763.99 GB/mo)
Add-on fills +763.99 GB/mo gap beyond plan/kit
$ 55.42
AI points add-on
x 0
0 points
not purchased
(plan/kit 5.0M points)
No requirement
$ 0
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 $154.42/mo all-in above.
Current usage sizing
AWS list pricing
2 × t4g.large × 730h
EC2 t4g.large → 98.11
2 × db.m6g.large (Multi-AZ) × 730h
RDS PostgreSQL db.m6g.large → 232.14
0.41 GB-month
RDS gp3 storage → 0.05
7.80 GB-month
S3 Standard → 0.18
344.35 GB (first 100GB free)
Internet egress → 30.99
Total ≈ $361.47 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $110,000 - $160,000
≈ $361
Based on the AWS estimate above
≈ $2,361
Infra $361 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $20,000 - $27,000
≈ $361
Based on the AWS estimate above
≈ $1,861
Infra $361 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $9,000 - $11,000
≈ $361
Based on the AWS estimate above
≈ $1,861
Infra $361 + 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
$154
All-in: egress / storage / auto-scaling; excludes AI usage
$154
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 ≈ $361.47/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 a stable registered base of 10,000 accounts because a multi-seller marketplace is a two-sided platform and no explicit user or transaction volume was provided. If your launch already has a known buyer, seller, or staff population, this anchor can be adjusted accordingly.
We assume 225 equivalent accumulation days because a new marketplace normally grows progressively as sellers add inventory and buyers join, which follows a standard linear-growth product pattern. If the marketplace launches with a full pre-existing catalog and customer base or experiences a concentrated recent surge, this parameter can be adjusted accordingly.
Daily Marketplace Discovery
Daily Marketplace Discovery
Daily Marketplace Discovery
Daily Marketplace Discovery
30
times/month
1.83 req/s
Peak load
We assume marketplace discovery is spread across a four-hour daily period because consumer browsing usually forms a broad routine rather than a bell-driven synchronized event. If advertising creates shorter demand spikes, the window can be narrowed accordingly. This scenario occurs daily, giving 30 monthly occurrences, and browsing is kept as its own purpose so its broad read demand is not blended with the smaller checkout population.
Main impact: AI Points
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
Public discovery path from marketplace results to individual listing details.
Marketplace Home Page
users
Registered buyer path for browsing and evaluating marketplace listings.
Marketplace Home Page
users
Buyer purchase path from a selected listing to payment initiation.
Marketplace Home Page
users
create_marketplace_checkout
Buyer path for reviewing past purchases and current order states.
Marketplace Home Page
users
Seller path for reviewing inventory and creating a new marketplace listing.
Marketplace Home Page
users
Seller path for maintaining an existing marketplace listing.
Marketplace Home Page
users
Seller path for reviewing paid items and recording fulfillment progress.
Marketplace Home Page
users
Administrator path for reviewing and deciding on seller-created listings.
Marketplace Home Page
users
page
data_table
action_flow
Marketplace Home Page
Public and registered-user view for browsing available marketplace listings.
Product Detail Page
Detailed listing view showing the product, seller, price, availability, and primary image.
Checkout Page
Buyer view for reviewing a selected product and starting payment.
Buyer Orders Page
Personal order history for registered buyers.
Seller Listings Page
Seller workspace for creating, reviewing, and updating marketplace listings.
Seller Orders Page
Seller workspace for reviewing and processing purchased order items.
Listing Review Page
Administrator queue for reviewing seller-created marketplace 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
What most affects resource usage for this marketplace?
Does the marketplace support multiple images per listing?
Which marketplace features are included in this estimate?
Does the design include online payment processing?
Copy to discuss with AI
Challenge & re-estimate
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