Ask HN: Those making $500/month on side projects in 2021 – Show and tell

• check-if-email-exists

  14 4,132 8.8 Rust

  Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.

  

I run an open-source [1] email verification API, called Reacher. I managed to hit 10k ARR this year (1st year).

It's written in Rust, self-hostable, and does not use a DB of emails (like some competitors do).

Landing page: https://reacher.email.

[1]: https://github.com/reacherhq/check-if-email-exists

• free-email-forwarding

  63 2,398 0.0 JavaScript

  The best free email forwarding for custom domains. Visit our website to get started (SMTP server)

  

Forward Email is doing several thousand per month now just one year in.

Site: https://forwardemail.net

Open Startup: https://forwardemail.net/open-startup

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• parsemail

  59 2 2.9 Go

  Hanami fork of https://github.com/DusanKasan/parsemail

  

• Just-Read

  5 1,170 7.2 JavaScript

  A customizable read mode web extension.

I made a customizable, feature-packed reader mode that earns around that: https://justread.link/

• inlets

  10 1,313 7.1 Go

  Get public TCP LoadBalancers for local Kubernetes clusters

  

• awesome-weekly-robotics

  10 545 5.0

  A list of projects that were or will be featured in Weekly Robotics newsletter

3 years ago I started a newsletter about robotics (https://weeklyrobotics.com/) and about month ago I opened it to advertisers and started earning about $600 a month from ads.

• i18n

  1 10 0.0 JavaScript

  i18n wrapper and Koa middleware for Lad (by ladjs)

  

It actually doesn't determine it by the country the request is coming from.

How it works is fully documented here: https://github.com/ladjs/i18n#i18nmiddlewarectx-next

1) Check URL (e.g. if /de or /de/ then it's a de locale - as long as de is a supported locale)

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• spamscanner

  4 265 0.0 JavaScript

  Spam Scanner is a Node.js anti-spam, email filtering, and phishing prevention tool and service. Built for @ladjs, @forwardemail, @cabinjs, @breejs, and @lassjs.

  

• inlets-pro

  23 518 5.1 Mustache

  Secure HTTP and TCP tunnels that just work

  

• inletsctl

  5 453 7.0 Go

  Create inlets servers on the top cloud platforms

  

• vatcomply

  3 18 5.9 Python

  VATcomply is a free API service for vat number validation, user ip geolocation and foreign exchange rates.

• AnonAddy

  288 3,008 7.6 PHP

  Anonymous email forwarding

  

I use and pay for https://anonaddy.com/ its also FOSS and can be self hosted.

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