a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This marketplace app enables sellers to publish and manage product listings while buyers browse products, view details, place paid orders, and review their order history. Sellers can view incoming orders and mark them fulfilled, while administrators review listing status to keep the marketplace catalog managed.
As an anonymous visitor, I can browse available products and view product details before deciding to register or purchase
As a buyer, I can browse a product and place a paid order
As a buyer, I can review my order history and current order status
As a seller, I can create and update my product listings
As a seller, I can review incoming orders and mark them fulfilled
As a marketplace administrator, I can review and moderate product listings
The following user counts are projected totals after one year of growth
50
marketplace_admins
Internal operations users who review and moderate marketplace product listings.
2000
sellers
Registered merchants who maintain product listings and fulfill orders assigned to their shop.
7950
buyers
Registered customers who browse products, pay for orders, and review their purchases.
1000
anonymous_visitors
Public visitors who may browse 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
Paid marketplace orders require payment capabilities available on the PRO plan.
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 10
386.25 GB/mo
500GB × 10/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +376.25 GB/mo)
Add-on fills +376.25 GB/mo gap beyond plan/kit
$ 29.17
Object storage
add-on
x 0
7.68 GB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~30%)
$ 0
Database storage add-on
x 0
237.21 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~322%)
$ 0
single-tenant kit
x 0
2 req/s
not purchased
(plan/kit 25 req/s)
Covered by plan/kit (margin ~1150%)
$ 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 $128.17/mo all-in above.
Current usage sizing
AWS list pricing
121.75 GB (first 100GB free)
Internet egress → 10.96
7.68 GB-month
S3 Standard → 0.18
0.24 GB-month
RDS gp3 storage → 0.03
2 × db.m6g.large (Multi-AZ) × 730h
RDS PostgreSQL db.m6g.large → 232.14
2 × t4g.large × 730h
EC2 t4g.large → 98.11
Total ≈ $341.41 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $100,000 - $145,000
≈ $341
Based on the AWS estimate above
≈ $2,341
Infra $341 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $16,000 - $23,000
≈ $341
Based on the AWS estimate above
≈ $1,841
Infra $341 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $7,000 - $10,000
≈ $341
Based on the AWS estimate above
≈ $1,841
Infra $341 + 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
$128
All-in: egress / storage / auto-scaling; excludes AI usage
$128
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 ≈ $341.41/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 10,000 registered accounts because a two-sided marketplace with no explicit user or transaction figure uses the standard mature marketplace anchor. The pool is divided among buyers, sellers, and a small operations team; if your marketplace has known seller onboarding or order-volume targets, this estimate can be adjusted accordingly.
We assume 225 equivalent operating days because a newly launched marketplace typically follows standard linear growth as buyers, sellers, listings, and orders accumulate over its first year. If your launch includes a full pre-existing dataset or experiences a rapid early adoption burst, this parameter can be adjusted accordingly.
Daily Order Tracking Period
Daily Order Tracking Period
Daily Order Tracking Period
Daily Buyer Shopping Period
30
times/month
1.2 req/s
Peak load
We assume order-status review forms a separate two-hour daily scenario because it serves an after-purchase purpose distinct from product discovery and checkout. The monthly frequency is 30 because buyers may review status on any day, including weekends. If fulfillment operates only on business days or notifications reduce manual checks, the frequency and duration can be adjusted accordingly.
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 pending marketplace listings and approves or rejects them.
Marketplace Browse Page
users
A seller opens incoming paid orders and marks a completed shipment or handoff as fulfilled.
Marketplace Browse Page
users
A seller reviews existing listings, creates a listing, and later updates listing information or inventory.
Marketplace Browse Page
users
A buyer reviews previous purchases and their current payment or fulfillment states.
Marketplace Browse Page
users
A registered buyer browses the catalog, selects a product, and completes a paid order.
Marketplace Browse Page
users
process_order_payment
An anonymous visitor browses available listings and opens product details without purchasing.
Marketplace Browse Page
users
page
data_table
action_flow
Product Review Page
Administrative queue for reviewing and moderating seller product listings.
Seller Orders Page
Seller-facing queue for reviewing paid orders and recording fulfillment.
Seller Listings Page
Seller workspace for reviewing, creating, and editing product listings.
Buyer Orders Page
Buyer-facing history of paid orders and their fulfillment status.
Product Detail Page
Detailed product view with seller information, availability, and buyer checkout.
Marketplace Browse Page
Public catalog for browsing and filtering marketplace 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
How does external payment processing affect the design?
Are multiple images supported for each listing?
Does the marketplace support products from multiple sellers in one checkout?
What activities are most likely to drive resource usage?
Copy to discuss with AI
Challenge & re-estimate
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