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I’m a high-school student and I built a free app to stop forgetting everything over the summer



Hey everyone,

The school year is almost over, and every summer I hit the same problem: by September I’ve forgotten most of what I learned. It happens with everything. I feel confident with math formulas while I’m using them, but after a few months away they look like I’ve never seen them. Same with languages — my English and German feel solid at the end of the year or after finishing a book, and a few weeks later my vocabulary and grammar have basically evaporated.

So I built a small app to fight that, called Revise: https://revise-o1t7.onrender.com/

The idea is simple: give yourself regular practice on the things you’ve actually studied, so they stick. You can practise math, history, languages, chemistry and biology — it generates exercises, reading texts (which you can translate word-by-word right in the app) and flashcards, all on a spaced-repetition schedule so things come back just as you’re about to forget them.

It works with whatever AI you already use: you copy a generated prompt into ChatGPT, Claude or Gemini (the free versions are fine), and paste the reply back. No API key, no subscription. It’s free, and you can install it to your phone from the menu.

I’ve been using it for a while and it’s genuinely helped me remember things, not just learn them once. I’d love your feedback — what’s confusing, what’s missing, what you’d want next (there’s a feedback button in your account settings).

Thanks for reading, and I hope it helps someone! 🙂



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How I Host My Side Projects for Under /Month (2026)


I run 4 live projects on a single VPS. Here’s exactly what I use and what it costs.

The Problem

You built an amazing side project. Now you need to deploy it.

Options:
→ Heroku: Free tier gone, cheapest $5+/mo per app 😬
→ Vercel: Great for frontend, limited backend ⚠️
→ AWS Free Tier: Complex, easy to overspend 💸
→ Shared hosting: Slow, outdated stacks 🐌

What I actually use for my projects:
→ 1 VPS + free tiers = everything running for ~$5/mo total 🎉

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My Setup at a Glance

Project
Tech Stack
Hosting
Cost

AgentVote (main site)
Node.js + Nginx
VPS (port 3000)
Included

CryptoSignal
Node.js + SQLite
Same VPS (port 3001)
Included

Hugo Blog
Static HTML
Same VPS (Nginx)
Included

Text Formatter
Node.js
Same VPS (port 3099)
Included

Total: $5/month for the VPS. Everything else is free.

Option 1: VPS (What I Use)

Why a VPS?

✅ Full root access — install anything
✅ Run multiple projects on one server
✅ Fixed monthly cost regardless of traffic
✅ Learn DevOps skills that transfer to any job
✅ Complete control over your stack
❌ You manage security updates yourself
❌ No auto-scaling (but side projects don’t need it)

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What to Look For

# Minimum specs for most side projects:
CPU: 1-2 cores
RAM: 1-2 GB (Node.js apps are light)
Storage: 25-50 GB SSD
Bandwidth: 1-2 TB/month (plenty for small projects)
OS: Ubuntu 22.04 or 24.04 LTS
Price: $3-6/month

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VPS Providers I’ve Used

DigitalOcean — My Recommendation

Basic droplet: $4/month (512MB RAM, 1 vCPU)
Standard droplet: $6/month (1GB RAM, 1 vCPU)
Pros: Simple dashboard, great docs, massive tutorial library
Cons: No free tier
If you sign up through my referral link, you get $100 in credits over 60 days

Hetzner Cloud (Europe-based, excellent value)

CX22: €3.29/month (~$3.50) — 2 vCPU, 2GB RAM, 40GB SSD
Pros: Best price-to-performance ratio
Cons: Support is Germany-timezone

Vultr

Starting at $2.50/month (512MB RAM)
Many global locations
Good if you need servers close to your users

Linode (Akamai)

Starting at $5/month
Reliable, been around forever
Good documentation

My Nginx Config (Running 4 Apps on One Server)

# /etc/nginx/sites-available/myserver
# Each app on its own port, one domain

server {
listen 80;
server_name agentvote.cc;

# Main app
location / {
proxy_pass http://127.0.0.1:3000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection ‘upgrade’;
proxy_set_header Host $host;
}

# CryptoSignal sub-path
location /signal/ {
proxy_pass http://127.0.0.1:3001/;
proxy_set_header Host $host;
}

# Blog (static files)
location /blog {
alias /root/data/disk/projects/alexchen-blog/public;
index index.html;
try_files $uri $uri/ /blog/index.html =404;
}

# Text formatter tool
location /format {
return 301 /format/;
}
location /format/ {
proxy_pass http://127.0.0.1:3099/;
}
}

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SSL with Let’s Encrypt (Free)

# Install certbot
apt install certbot python3-certbot-nginx -y

# Get certificate (free, auto-renews!)
certbot –nginx -d agentvote.cc -d blog.agentvote.cc

# Done! HTTPS enabled, auto-renewal before expiry

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Process Management (Keep Apps Running)

# Option A: PM2 (simplest)
npm install -g pm2
pm2 start “node server.js” –name “app1”
pm2 start “node server.js” –name “signal”
pm2 startup # Auto-start on boot
pm2 save # Save process list

# Option B: systemd (no extra deps)
# /etc/systemd/system/app1.service
(Unit)
Description=App1
After=network.target

(Service)
Type=simple
User=root
WorkingDirectory=/root/data/disk/projects/app
ExecStart=/root/.nvm/current/bin/node server.js
Restart=always
RestartSec=10

(Install)
WantedBy=multi-user.target

systemctl enable app1 # Enable on boot
systemctl start app1 # Start now
journalctl -u app1 -f # View logs

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Option 2: Free/PaaS Tiers (Great for Startups)

Vercel — Best for Frontend

Free: 100GB bandwidth, 100 serverless function invocations/day
Perfect for: React/Next.js/Vue/Svelte static sites & SSR
My blog’s frontend could run here free
Deploy: connect GitHub repo → auto-deploy on push

Railway — Easiest Backend Hosting

Free tier: $5 credit/month (enough for small hobby apps)
One-click deploy from GitHub
Auto-scales (but watch the costs!)
Great for: APIs, bots, background workers

Render — Heroku Alternative

Free tier: Web service (sleeps after 15min inactivity)
Databases: Free PostgreSQL (up to 90 days trial)
Great for: Quick prototypes, demos

Fly.io — Edge Deployment

Free allowance: 3 shared-cpu VMs × 256MB RAM
Deploy Docker containers globally
Great for: Low-latency global apps

Glitch — For Learning/Experiments

Completely free for public projects
Live editing in browser
Great for: Prototypes, learning, hackathon projects

Option 3: Hybrid Approach (Smartest)

Static sites → Vercel free tier (fast CDN, zero config)
API servers → Your VPS ($5/mo, full control)
Databases → SQLite on VPS (free) or Supabase free tier
Background jobs → Vercel Cron or your VPS
Files → Cloudflare R2 (S3-compatible, 10GB free)
Email → Resend (3000 emails/month free)

Result: Nearly free infrastructure that scales when needed.

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My Monthly Cost Breakdown

Item
Cost
Notes

VPS (Hetzner/DigitalOcean)
$3.50-$5.00
Runs all my apps

Domain name (.cc)
~$8/year
~$0.67/month

Let’s Encrypt SSL
$0
Free, auto-renewing

Cloudflare DNS/CDN
$0
Free tier covers my needs

Total
~$5.67/month
For 4+ projects

How to Get Started (Step by Step)

Week 1: Get One App Running

1. Sign up for (DigitalOcean)(https://www.digitalocean.com/) (or Hetzner)
2. Create a droplet/server (Ubuntu 22.04, $4-6/mo plan)
3. SSH into your server
4. Install Node.js: curl -fsSL https://fnm.vercel.app | sh
5. Clone your project: git clone your-repo
6. npm install && npm run build
7. Start it: node server.js (or npm start)
8. Install Nginx: apt install nginx
9. Point domain to server IP
10. Set up SSL: certbot –nginx -d yourdomain.com

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Week 2: Add Monitoring

# Uptime monitoring (free)
# UptimeRobot or Uptime.kuma (self-hosted)

# Error tracking
# Sentry (free tier for

# Log management
# journalctl -u your-app (built-in with systemd)
# Or Loki/Grafana (self-hosted free)

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Week 3: Optimize

# Add rate limiting to Nginx
# Set up automated backups
# Configure log rotation
# Add health check endpoints
# Monitor resource usage

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What About When You Scale?

Don’t optimize prematurely!

My rule of thumb:

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What’s your current hosting setup? Are you overpaying?

Follow @armorbreak for more practical DevOps content.

Resources mentioned:



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