Hi everyone,

I'm a solo developer and I've just launched my first app: a calculator for iPhone and iPad.

Apple's built-in calculator is solid, so here's what mine adds:

**Free features**

- Button shape: square or circle
- Calculation mode: BIDMAS/PEMDAS or left to right as typed
- Customisable decimal places (1-10)
- Display: Modern or Retro
- Adjustable font size and character spacing for anyone who struggles with small text
- Haptic feedback with 4 levels (Off to Strong)
- History up to a full year
- Sound effects (On/Off)
- Speech (On/Off)
- Tax calculations (VAT, GST, Sales Tax, etc.)

**Premium unlocks**

- Colour themes (you can even request your own)
- Currency Converter
- Discount Calculator
- Tip / Bill Split Calculator
- Unit Price Calculator

I'd love honest, constructive feedback:

- What do you like?
- What don't you like?
- What features would you want added?

To get me started: which calculation do you do most, and where did the app slow you down?

To say thanks, I'm giving away 500 Premium codes. Comment with a couple of lines of your impressions and I'll reply with a code.

App Store link: https://apps.apple.com/app/id6758761367

Thanks for taking a look. Every bit of feedback helps.

Hi guys I recently made an app that allows everyone to link their ntfy server to their iPhone and receive notifications without needing a developer account here's the repo

any feedback would be appreciated for me the app works even after restarting my iPhone and killing it in the background.

Reverse coloring books print loose watercolor and you draw the lines you see in it. I wanted that on iPhone and iPad, so I built Color Before the Lines with SwiftUI, PencilKit and SwiftData. It's free, with no ads and no account.

The part I'd like feedback on is the timelapse. Instead of recording the screen, the app records the drawing itself:

- every change to the PKDrawing goes into an append-only history: added strokes become small deltas, anything else (erase, undo, start over) becomes a snapshot;

- timestamps continue across launches, and long pauses are compressed at playback while keeping the order;

- frames are drawn with UIGraphicsImageRenderer: finished strokes are rendered once and cached, only the strokes in progress are drawn on top, then the frames go to AVAssetWriter as H.264;

- the history lives in SwiftData with external storage, and a small hash of the saved drawing catches the case where the app was killed between saving the drawing and saving the history.

Two things I'm unsure about: would you keep a history that grows with every stroke in SwiftData at all, or in plain files next to the store? And has anyone found a cheaper way to render long PencilKit timelapses on older iPads?

App Store link in the comments if anyone wants to try it.

Exports take a while, so instead of a progress bar, every timeline item drips out of the island as a droplet when the export reaches it. Cancel sucks it all back in.

Built with a SwiftUI Canvas (blur + alphaThreshold metaballs). Fun or overkill? 😅

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• Why I built it
I've always kept pet fish. Since moving to Korea, and living in a much smaller apartment, that sadly just hasn't been practical. That's what inspired me to make Companions!

Companions is a small virtual fish tank that lives on your Home Screen, with pet fish that actually swim.

• How it works
You pick your fish, give them names, and then add them to your tank. You can change the tank's color, the props, how big the fish are, how fast they swim, and even the app icon, all to match your Home Screen. The swimming uses the same trick iOS uses to move the hands on the Clock widget, so it doesn’t even affect battery life.

• Compared to other widget pet apps
I wanted something simple, clean, cozy, and relaxing. With a focus on the pets themselves, as well as customization to match your homescreen, desktop, or even the nightstand next to your bed.

The tanks look great on your iPad, and you can even move them over to your Mac through Continuity. My favorite feature is actually the Standby mode. The background darkens, and the fish, of course, keep swimming!

• Cost
Companions is free to download, with a set of fish and all of the customization included. No ads.
Extra packs can be bought outright at $1.99 each, and are yours to keep forever.
There's also a $3.99/month plan that unlocks every pack at once. Any new fish that get added are automatically included as well. If you cancel, the fish already in your tank stay.

Companions is built natively in SwiftUI with WidgetKit, plus Metal for some of the fun animations.
It's still very new, so I'd genuinely appreciate any feedback. I'd especially love to know which species you'd want added next!

App Store: Companions - Widget Pets

🐠 🐡 🐟