a multi-seller marketplace app
PROJECT OVERVIEW
What this app does
This app is a two-sided marketplace where public visitors and registered buyers can browse seller-created product listings, view product details, and place paid orders. Sellers can publish listings, review purchases involving their products, and update fulfillment status, while buyers can review their order history.
As an anonymous visitor, I can browse available marketplace products and view product details
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 states
As a seller, I can create and review my product listings
As a seller, I can review purchased items and update their fulfillment status
The following user counts are projected totals after one year of growth
1000
anonymous_visitors
Public visitors who browse marketplace listings without a registered account.
9000
buyers
Registered customers who browse products, purchase a listing, and review their orders.
1000
sellers
Registered marketplace suppliers who create product listings and manage fulfillment.
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 PRO payment features.
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
1 req/s
not purchased
(plan/kit 25 req/s)
Covered by plan/kit (margin ~2400%)
$ 0
Database storage add-on
x 0
188.82 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~430%)
$ 0
Object storage
add-on
x 0
872.81 MB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~1046%)
$ 0
Outbound data transfer add-on
x 7
266.25 GB/mo
500GB × 7/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +256.25 GB/mo)
Add-on fills +256.25 GB/mo gap beyond plan/kit
$ 20.42
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 $119.42/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
0.19 GB-month
RDS gp3 storage → 0.02
0.87 GB-month
S3 Standard → 0.02
52.85 GB (first 100GB free)
Internet egress → 4.76
Total ≈ $335.05 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $110,000 - $150,000
≈ $335
Based on the AWS estimate above
≈ $2,335
Infra $335 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $18,000 - $24,000
≈ $335
Based on the AWS estimate above
≈ $1,835
Infra $335 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $8,000 - $10,500
≈ $335
Based on the AWS estimate above
≈ $1,835
Infra $335 + 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
$119
All-in: egress / storage / auto-scaling; excludes AI usage
$119
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 ≈ $335.05/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 volume matches the typical mature registered-account anchor for a multi-seller platform. This pool includes buyers and sellers but excludes anonymous visitors. If your actual launch has a known seller count, buyer count, or order throughput, this parameter can be adjusted accordingly.
We assume 225 effective accumulation days because a new marketplace normally grows progressively as sellers add supply and buyers join, which follows a standard linear-growth product pattern rather than launching with a full pre-existing dataset. If your marketplace is a brownfield launch or expects a rapid early audience burst, this parameter can be adjusted accordingly.
Daily Marketplace Shopping
Daily Marketplace Shopping
Daily Marketplace Shopping
Daily Marketplace Shopping
30
times/month
0.72 req/s
Peak load
We assume public browsing and registered shopping concentrate into a two-hour daily marketplace window because consumer marketplaces commonly experience a broad evening demand period rather than a single externally synchronized instant. Anonymous discovery and registered purchasing are separated as parallel purposes because only buyers can start checkout and their conversion rate is much lower than browsing volume. The scenario lasts 7,200 seconds and occurs on all 30 days of a typical month. If promotions create shorter traffic bursts or the marketplace operates mainly on weekdays, these parameters 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
Public discovery flow from the marketplace catalog to individual product details.
Marketplace Home Page
users
Registered buyer flow for discovering a product and beginning payment.
Marketplace Home Page
users
create_order_payment
Buyer flow for reviewing previous purchases and their current states.
Marketplace Home Page
users
Seller flow for reviewing existing products and publishing a new listing.
Marketplace Home Page
users
Seller flow for reviewing purchased items and recording fulfillment progress.
Marketplace Home Page
users
page
data_table
action_flow
Marketplace Home Page
Public product-discovery page for browsing available marketplace listings.
Product Detail Page
Listing detail and checkout-entry page for a selected product.
Buyer Orders Page
Private page where buyers review their marketplace order history.
Seller Listings Page
Seller workspace for reviewing and creating product listings.
Seller Orders Page
Seller workspace for reviewing purchased items and updating fulfillment progress.
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 include a shopping cart?
Can sellers manage their own products and orders?
How do product images affect capacity?
Is payment processing included?
Copy to discuss with AI
Challenge & re-estimate
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