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

1. check-if-email-exists

   1 14 4,433 8.7 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

2. CodeRabbit

   coderabbit.ai featured

   CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.

   

3. free-email-forwarding

   2 63 2,461 0.0 JavaScript

   Discontinued Repository archived and moved to monorepo

   

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

   Site: https://forwardemail.net

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

4. parsemail

   3 59 2 2.9 Go

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

   

5. Just-Read

   4 5 1,230 5.6 JavaScript

   A customizable read mode web extension.

   

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

6. inlets

   5 10 1,365 7.0 Go

   Get public TCP LoadBalancers for local Kubernetes clusters

   

7. awesome-weekly-robotics

   6 10 713 5.5

   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.

8. i18n

   7 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)

9. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

10. spamscanner

    8 4 306 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.

    

11. inlets-pro

    9 23 547 0.0 Mustache

    Secure HTTP and TCP tunnels that just work

    

12. inletsctl

    10 5 472 6.6 Go

    Create inlets servers on the top cloud platforms

    

13. vatcomply

    11 3 26 3.8 Python

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

    

14. AnonAddy

    12 292 3,667 7.0 PHP

    Anonymous email forwarding

    

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

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