a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This marketplace app connects buyers and sellers through a shared catalog of seller-published listings. Visitors can browse listings, registered buyers can place and review orders, and sellers can publish listings with images and manage item fulfillment. The core value is a closed marketplace workflow from listing creation through purchase and seller fulfillment.
As an anonymous visitor, I can browse available marketplace listings and view listing details
As a buyer, I can browse and compare available marketplace listings
As a buyer, I can place an order for an available listing
As a buyer, I can review my orders and their fulfillment status
As a seller, I can publish a marketplace listing with images, price, and available quantity
As a seller, I can review my published marketplace 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.
8000
buyers
Registered customers who browse listings, place orders, and review their purchases.
2000
sellers
Registered marketplace providers who publish listings and fulfill purchased items.
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 features available only in PRO.
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
872.37 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~15%)
$ 0
Object storage
add-on
x 1
14.19 GB
100GB × 1/year, amortized monthly
(plan/kit 10.00 GB + add-on +4.19 GB)
Add-on fills +4.19 GB gap beyond plan/kit
$ 2.92
Outbound data transfer add-on
x 34
1.41 TB/mo
500GB × 34/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +1.40 TB/mo)
Add-on fills +1.40 TB/mo gap beyond plan/kit
$ 99.17
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 $201.08/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
0.87 GB-month
RDS gp3 storage → 0.1
14.19 GB-month
S3 Standard → 0.33
709.95 GB (first 100GB free)
Internet egress → 63.9
Total ≈ $394.57 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $120,000 - $165,000
≈ $395
Based on the AWS estimate above
≈ $2,395
Infra $395 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $20,000 - $26,000
≈ $395
Based on the AWS estimate above
≈ $1,895
Infra $395 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $9,000 - $11,000
≈ $395
Based on the AWS estimate above
≈ $1,895
Infra $395 + 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
$201
All-in: egress / storage / auto-scaling; excludes AI usage
$201
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 ≈ $394.57/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 multi-seller marketplace is a two-sided platform and this is the standard mature registered-account anchor when no explicit user or transaction volume is provided. If your actual business operations differ, such as launching for a closed local community or importing an existing customer base, this parameter can be adjusted accordingly.
We assume 225 equivalent accumulation days because a newly launched marketplace normally grows progressively as buyers, sellers, listings, and orders are acquired over the year, which matches a standard linear-growth product. If your actual business operations differ, such as a launch with a full pre-existing dataset or a short recent growth surge, this parameter can be adjusted accordingly.
Evening Marketplace Activity
Evening Marketplace Activity
Evening Marketplace Activity
Evening Marketplace Activity
30
times/month
1.78 req/s
Peak load
We assume a two-hour evening marketplace scenario because consumer browsing and purchasing typically form a broad after-work demand period rather than a synchronized rush. Public discovery and registered purchasing are separated into independent purposes because anonymous detail browsing does not imply order placement. The scenario occurs daily, including weekends, so it is represented by 30 monthly occurrences. If your actual business operations have timed product releases or business-hours-only demand, the duration and frequency 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 for browsing listings without a registered account.
Marketplace Catalog
users
Registered buyer flow from marketplace discovery through order placement.
Marketplace Catalog
users
publish_listing_flow
Buyer flow for reviewing prior purchases and current fulfillment status.
Marketplace Catalog
users
Seller flow for reviewing inventory and publishing a listing with images.
Marketplace Catalog
users
publish_listing_flow
Seller flow for reviewing sales and updating purchased-item fulfillment.
Marketplace Catalog
users
page
data_table
action_flow
Marketplace Catalog
Public and registered-user catalog for discovering available marketplace listings.
Listing Detail
Detailed listing page where visitors review an offer and registered buyers place an order.
Buyer Orders
Account view for buyers to review orders and item fulfillment status.
Seller Listings
Seller workspace for publishing and reviewing marketplace listings.
Seller Sales
Seller queue 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 will drive resource usage for this marketplace?
Which marketplace features are included?
How do product images affect the plan requirements?
Does the estimate include payment and shipping integrations?
Copy to discuss with AI
Challenge & re-estimate
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