Choose and implement Replit validated architecture blueprints for different scales.
Use when designing new Replit integrations, choosing between monolith/service/microservice
architectures, or planning migration paths for Replit applications.
Trigger with phrases like "replit architecture", "replit blueprint",
"how to structure replit", "replit project layout", "replit microservice".
Application architectures on Replit at three scales: single-file prototype, modular production app, and multi-service architecture. Each matches Replit's container model, built-in services, and deployment types.
Prerequisites
Replit account
Understanding of deployment types (Static, Autoscale, Reserved VM)
Familiarity with Replit's storage options
Architecture Decision Matrix
Factor
Single-File
Modular App
Multi-Service
Users
Prototype, < 100/day
100-10K/day
10K+/day
Database
Replit KV (50 MiB)
PostgreSQL
PostgreSQL + cache
Storage
Local + KV
Object Storage
Object Storage + CDN
Persistence
Ephemeral OK
Durable required
Durable required
Deployment
Repl Run / Autoscale
Autoscale / Reserved VM
Multiple Reserved VMs
Cost
Free-$7/mo
$7-25/mo
$25+/mo
Always-on
No (free), Yes (deploy)
Yes (deployment)
Yes (deployment)
Instructions
Variant A: Single-File Script (Prototype)
Best for: Bots, scripts, learning, hackathon projects.
# main.py — everything in one file
from flask import Flask, request, jsonify
from replit import db
import os
app = Flask(__name__)
# KV Database for simple state
@app.route('/')
def home():
count = db.get("visits") or 0
db["visits"] = count + 1
return f"Visit #{count + 1}"
@app.route('/api/notes', methods=['GET', 'POST'])
def notes():
if request.method == 'POST':
note = request.json
notes = db.get("notes") or []
notes.append(note)
db["notes"] = notes
return jsonify(note), 201
return jsonify(db.get("notes") or [])
app.run(host='0.0.0.0', port=int(os.environ.get('PORT', 3000)))
# .replit
run = "python main.py"
[nix]
channel = "stable-24_05"
[deployment]
run = ["python", "main.py"]
deploymentTarget = "autoscale"
Limitations: 50 MiB data, files lost on restart, cold starts. Upgrade to Variant B when you need structured data or durability.
Variant B: Modular App with PostgreSQL (Production)
Best for: Web apps, APIs, SaaS MVPs with 100-10K daily users.
