Show HN: 12 Years Building an Interval Timer App

1 melvinzammit 2 8/12/2025, 9:15:29 AM exercisetimer.net ↗

In 2013, I couldn’t find a decent interval timer for my workouts on the Android Market (Google Play wasn’t even called Google Play yet!). Could you believe that? Typing 'interval timer' returned nothing! So I decided to build a simple App while in college.

Fast forward 12 years, that simple timer has grown into an ecosystem: Android, iOS, Wear OS, Apple Watch, and a coaching platform. All built solo, with no AI assistance, and redesigned 4 times to keep up with UI trends.

Over the years I’ve learned a lot about long-term app maintenance, cross-platform challenges, and keeping codebases alive, shifting frameworks, database migrations and OS updates.

Here's to all the solo indie App Developers out there!

Comments (2)

vivaankumar · 2h ago

Holy bro congrats

melvinzammit · 2h ago

thanks :)

CPI for all items rises 0.2% in July; shelter up (bls.gov)

The "Incriminating Video" Scam (buzzfeed.com)

Nvidia debuts new world foundation models for robotics developers (nvidianews.nvidia.com)

What an Alaskan Furniture Company Tells Us About Tariffs [video] (youtube.com)

Annie Jacobsen on Nuclear War, Intelligence Operations, and Conspiracy Realities (conversationswithtyler.com)

Curbing sugar won't curb your sweet tooth, scientists say (sciencedaily.com)

The surprising economics of the meat industry (dwarkesh.com)

Managing Time Shiftable Devices (bitsandtheorems.com)

The Management Myth (theatlantic.com)

Is using AI wrong? A review of six popular anti-AI arguments (seangoedecke.com)

How can we rewild the Earth at scale? (elysian.press)

Chromahack – programming language inspired by hacker movies (chromahack.rerere.org)

Two hours with Cursor changed my mind about AI coding (betweentheprompts.com)

Wikipedia loses UK Safety Act challenge (arstechnica.com)

Mesozoic atmospheric CO2 concentrations reconstructed from dinosaur tooth enamel (pnas.org)

Geometry Solves Gerrymandering (nytimes.com)

Ask HN: Looking to sell of the domain Stable agents

BlaBlaSell – new social platform for creatives (feedback welcome) (blablasell.com)

High-severity WinRAR 0-day exploited for weeks by 2 groups (arstechnica.com)

Play of Battle (playofbattle.com)

Outside of the top stocks, S&P 500 forward profits haven't grown in 3 years (insight-public.sgmarkets.com)

How the cavefish lost its eyes – again and again (knowablemagazine.org)

Musk says xAI to take legal action against Apple over App Store rankings (reuters.com)

133-year old Kodak says it might have to cease operations (cnn.com)

Show HN: Comprehensive interview questions for AI product engineering roles (aiproductengineerinterview.com)

"It's the Wild West," says James Cameron of the use of generative AI in film (screendaily.com)

Angel Investors, a Field Guide (jeanyang.com)

Show HN: AI-driven infra platform that builds and manages cloud resources (cloudlvl.com)

Migration Is Remaking Our World, and We Don't Understand It at All (nytimes.com)

Replace your boss before they replace you (replaceyourboss.ai)

Diff Risk Score: AI-driven risk-aware software development (engineering.fb.com)

What Are Outcomes? (leadinginproduct.com)

Le Lamp – an open source expressive robot (github.com)

Improving Video Quality Control at Netflix with Pixel Error Detection (netflixtechblog.com)

Progress towards universal Copy/Paste shortcuts on Linux (mark.stosberg.com)

Would a Blockchain have prevented LIBOR fraud? (shkspr.mobi)

Monero appears to be in the midst of a successful 51% attack (twitter.com)

Show HN: I made another voice recording app, but this one is different (voicememos.co)

Relentlessly Resourceful (2009) (paulgraham.com)

Elon Musk Threatens to Sue Apple over App Store Rankings (macrumors.com)

Tell HN: Using Claude Code with official 3rd party APIs seems broken

Terminal User Interfaces (onbreakpoint.com)

4 Weeks to a 4.0: Adopt an Autopilot Schedule and a Sunday Ritual (calnewport.com)

EJ Antoni: Trump picks conservative economist to head Bureau of Labor Statistics (bbc.com)

Ask HN: Looking for an Invitation to Join Lobste.rs

Why your brain is the biggest bottleneck in AI productivity (jennywanger.com)

Desired features in a "Git-killer" (next-generation DVCS) (heidiwaterhouse.com)

Yvette Cooper Is Lying (craigmurray.org.uk)

The Heart Breaking Inadequacy of AbortController (frontside.com)

Billions Flow to New Hedge Funds Focused on AI-Related Bets (wsj.com)

Show HN: 12 Years Building an Interval Timer App

Comments (2)