15 years ago, I released a little calculator app called Calculus doodlus. The first version went live on September 23, 2011.

I'm still working on it. 😄

Version 3.0 was recently released, and it brings two features I've wanted to add for a long time: Edit and Link.

A - Answer

Calculus doodlus is a calculator designed around the way you actually work with calculations.

Instead of replacing your previous calculation every time you press =, your calculations stay on the page. You can scroll back, see what you did, and reuse previous values.

And after all these years, it still has the handwritten look that people have loved about the app.

B - Better

Edit: Long-press any calculation to go back and change it. The calculation is recalculated while keeping the rest of the page intact.

Link: Tap a calculation or result to reuse its value in another calculation. If the original value changes later, linked calculations update automatically.

There are also pages for organizing calculations, √, support for very large numbers, sharing a calculation page as an image, and Lock Screen / Control Center features.

But the basic idea hasn't changed in 15 years: a friendly calculator that keeps your calculations around instead of making them disappear.

C - Cost

Calculus doodlus is free to download and supported by advertising.

If you'd rather use it without ads, there's an optional subscription for €3.99/year, with Family Sharing included.

No account required.

I'd love to hear what you think, especially if you've tried other calculators with a persistent calculation history. What would make you switch to something like this?

https://apps.apple.com/app/calculus-doodlus/id465916328

Hi everyone—full disclosure: I’m the developer of PrivacyCam, and I recently made its source code available under the Apache 2.0 license.

PrivacyCam helps you review photos, videos, and PDFs before sharing them. It can detect faces, people, license plates, QR codes, barcodes, and sensitive text such as phone numbers, email addresses, payment-card details, and addresses. You can then blur, pixelate, or completely black out selected areas.

Detection and media processing happen on the device. Photos, videos, PDFs, and detected text aren’t uploaded to a server operated by me, and no account is required. The source is public so people can inspect how these privacy protections are implemented.

The app is free to download, with an optional $2.99 one-time purchase for batch-photo features—no subscription. For complete transparency, purchases are processed by Apple.

I’d appreciate comments on the privacy model, redaction workflow, and source code. What other sensitive information should an app like this help users identify?

• App Store
• Source code on GitHub

Whispr is a private voice keyboard for iPhone. The AI clean up and all the features is landing as an update tomorrow.

Talk in any app and AI cleanup turns it into clean text.

Glide typing, autocorrect and boosted phrases are built in, and everything runs on your iPhone with no account needed.

Ultra (lifetime, no subscription) is now $2.99, down from $29.99.

https://apps.apple.com/app/id6757571618

I’m the solo developer behind Multi Timers & Talking Alarms, available for iPhone and Apple Watch.

A — Answer

The app began with a simple problem: during busy, hands-full moments, I didn’t have time to repeatedly unlock my iPhone and open an app just to check several timers.

Apple’s built-in Clock app works well for basic timing. The difficulty begins when several timers are running.

Finding the right timer from the Lock Screen can require waking the screen, expanding the timer stack, and sorting through several similar-looking entries. Upcoming alarms are not shown there before they ring, so checking what is scheduled means opening Clock and switching to the Alarms tab.

Lock Screen controls can also be triggered accidentally when an iPhone wakes as it is taken from a pocket, bag, or drawer.

What began as a solution for busy, hands-full moments has since evolved into a complete timer board spanning the iPhone, Lock Screen, and Apple Watch.

B — Better

Instead of sorting through a stack of similar-looking timers, you get:

• One color-coded board containing countdowns, scheduled alarms, and notes  

• Lock Screen snapshots showing names, colors, remaining time, and expected finish time  

• Spoken alerts that tell you what is ready without requiring you to look  

• Custom and recorded alarm sounds  

• A native seven-slot Apple Watch board  

• Face ID–protected Lock Screen controls to help prevent accidental taps  

• Saved timer configurations and Markdown notes  

• Siri controls and Home Screen widgets

C — Cost

Free to download. No ads. No subscription. No account required. No data collected.

Optional one-time purchases in the US:

• All Timer Slots — $0.99  

• Palette Unlock — $2.99  

• Buy Developer a Coffee — $4.99 optional tip

App Store:

https://apps.apple.com/app/id6763252662

I'm Jerry, founder of Monni.

I'm giving 20 people a free 1-year membership in exchange for blunt feedback on the first week.

Monni is an iOS money brief for people who want a lighter weekly check-in instead of a full budgeting system.

Best fit:

• you use or used Mint, Monarch, YNAB, Simplifi, spreadsheets, or mental math
• you want a clearer "what's safe to spend this week?" view
• you're okay telling me what feels confusing or untrustworthy

App Store: https://apps.apple.com/us/app/monni-ai-money-tracker/id6778174904

Website: https://monni.io

DM me if you want one. I'll reply asking for the email to grant access to, then manually add the free year.

Please don't post your email publicly, and don't send balances, screenshots, account numbers, addresses, passwords, or private financial details. High-level workflow feedback is enough.

I may be biased because I'm the founder of Monni.io.

After streaming a lot of music on my phone, I was in the mood to just listen to some local over-the-air radio stations. I found out that it’s not so easy to find an app that does this simply and isn’t made almost unusable by lots of annoying ads.

That was the idea behind creating Kitchen Radio. It reminded me of a friend who owns a lot of tech, but once said he wished he just had a simple radio in his kitchen to turn on and listen to.

Since it’s still an app, it’s also possible to discover all kinds of new music from around the world.

Since the app is new, I would really appreciate your honest feedback. :-)

Download

• Google Play: Kitchen Radio on Google Play
• Apple App Store: Kitchen Radio on the App Store

Features

• 📻 See your city's local radio stations
• 🌍 Find internet radio stations from all over the world by your favourite genres
• ❤️ Save your favourite songs and listen to them later on YouTube or Spotify
• 🌙 Set a sleep timer
• 🚗 Android Auto support
• ⏰ Wake up to your favourite radio station
• 📺 Chromecast support

For a furniture maker, a useful Reddit post could explain which measurements a customer should take before ordering a dining table: room size, space to move the chairs, and the delivery route. That gives people something practical to use and a specific question to ask next.

Here is a simple checklist for turning that kind of expertise into a community post:

1. Find a community discussing the actual buying problem. Read its promotion rules and use the designated thread if it has one.

2. Answer one customer question in the post itself. Make the explanation useful before asking anyone to visit a website.

3. Disclose your connection to the business and use a link only where permitted.

4. Save the permalink and check what happened after posting. An entry in your own profile does not by itself prove other readers can see it.

5. Return for real questions. Keep post views, website visits, inquiries and paid orders as separate numbers.

I'm with the ThreadFox team at AMF Indiana. We put the process into a free guide you can follow with a spreadsheet:

https://threadfox.vip/guides/reddit-self-promotion?utm_source=reddit&utm_campaign=tf-businesspromotion

ThreadFox also offers a paid toolkit for your own AI assistant and browser, plus a managed campaign service if you want us to do the research, posting and follow-up. The options and published scope are here:

https://threadfox.vip/?utm_source=reddit&utm_campaign=tf-businesspromotion

Keeping track of job applications can get overwhelming fast - spreadsheets, scattered notes, and missed follow-ups. JobSnail helps you stay organized by tracking applications and interviews in one place, without the clutter.

💡 Want Lifetime Premium?

Drop a comment, upvote, and DM me for a promo code. The first 100 people will get the code.

JobSnail is available as a MacOS and iOS versions on the App Store. And there's also a web version at jobsnail.app. It's also worth mentioning that all the apps are fully synced through iCloud, and an Apple account is required to use the app on Web.

I came across a newer backend server for selfhosted audiobooks called BookOrbit and decided to give it a try and enjoyed the more modern look and feel.

Searching the app stores I couldn’t find any players that supported BookOrbit so I decided to make it and ended up bringing in support for Audiobookshelf and Grimmory (and Booklore).

Morrow is live on the Apple store or feel free to jump on the testflight and help with some additional stress testing (an apple tv version is pending its first review for testflight... the tvOS version is definitely rough around the edges and will need more polish and functionality brought in... but is functional).

Hey developers,

I was so frustrated with the "freemium" trap. Every "free" background remover I tried would compress my images or hide the full-quality, lossless download behind a subscription or paywall.

As a side project, I decided to build the tool I actually wanted: https://www.nobg.space/

It's different because the entire AI process runs 100% in your browser

This means:

It's 100% free, forever. (There are no server costs for me to cover.)

It's 100% private. (Your images are never uploaded.)

You get the full, lossless quality download every single time.

I built this specifically for designers who are tired of struggling with those paywalls. I hope it helps your workflow!

I love listening to audiobooks before bed, but I kept running into the same problem: falling asleep and waking up hours later with no idea where I was in the story.

So I built StreamSleep, an Android app designed to help stop playback after you fall asleep.

I'm looking for audiobook listeners who'd be willing to give it a try and share honest feedback.

If you regularly fall asleep listening to Audible or other audio content, I'd love to hear what you think.

https://play.google.com/store/apps/details?id=com.streamsleep.app

App Name:

Fênix

What it does:

Fênix is a social community app where users can join communities based on their interests, meet new people, chat, create content and customize their profiles. Each community can have its own identity, chats, activities and member profiles.

Key Features:

• Communities with community-specific profiles

• Public chats, private DMs and voice calls

• Blogs, polls, quizzes, Aura stories, rankings and customization

Giveaway:

Not applicable

Cost:

Free to download, with optional in-app purchases and Essence premium features.

Link:

https://play.google.com/store/apps/details?id=com.vnprime.fenix10⁠

Extra:

I’m actively improving Fênix and would really appreciate feedback about the UI, communities, chat system and features you think could be improved or added. 🔥

I launched the new Founder subscription today. I wrote more about why I’m doing it and what it means here:

https://wellnessproject.ai/early-access

You can sign up as a founder here:

https://wellnessproject.ai/settings/subscription

Also shipped this week:

• Push-to-talk voice logging Food barcode scanning
• Expanded body metrics, including BMI, body composition, tape measurements and more
• Chat history, free for everyone for the next 60 days
• Set / rep / weight workout imports on Android where Health Connect exposes the data
• Sync improvements to make wearable and health data updates more stable and frequent
• Better nutrition syncing and broader wearable / smart-scale support
• Continued expansion of language support
• Apple still doesn’t expose detailed strength-workout sets and reps the same way Android can, so we're exploring direct integrations there.

The product is starting to feel much more like the health data layer I originally wanted to build: workouts, nutrition, sleep, recovery, body composition and AI in one place.

As always, suggestions are very welcome.

Title:N3-Gallery- Open iPhone HEIF screenshots

App Name:N3 Gallery

What it does: N3 Gallery is an full Photo app. It cann open IPhone HEIF Screenshots.

Key Features: 1. View iPhone HEIF screenshots 2. Vuew the Full Meta Data 3. View other Photo Formats

Goal: Lunch

Cost: It's Free with no ads!​

Link: https://github.com/n3sta-vibecode/N3-Gallery---Open-IPhone-Screenshot-HEIF/blob/main/N3Gallery-1.16-Open-iPhone-HEIF-Screenshot-release.zip

I’m building Nova, a Mac prototype that animates a face from the live audio of an AI voice conversation. The current demo uses audio from a ChatGPT/Codex voice chat; it does not read chat history or connect directly to ChatGPT or Claude model APIs yet.

The hard part has been making speech look human: closed lips staying still, teeth staying opaque during transitions, and cheeks moving with the mouth. I’m still refining lip sync and the mouth edges. I’d value specific feedback from people who work with generative characters: at what moment does the face stop feeling natural, and what would you fix first?

Demo video: https://vimeo.com/1232862019

The image is a screenshot of the current Mac prototype beside the conversation. Different avatars and voices, plus a Claude connection, are directions I want to build next; they are not shipping features today.

I shared an early version here a couple of days ago. Since then, PicPop 1.0.5 is live with screenshot, blurry-photo and large-video cleanup alongside similar-shot review. I wanted the demo to show the part I care about most: swipe to queue, review your picks, then confirm. Nothing is deleted before confirmation, and scanning stays on the iPhone.

I’m the developer. PicPop is free to download; full access is through paid PicPop Club ($4.99/month, $24.99/year with a 3-day trial, or $59.99 lifetime in the US).

App Store: https://apps.apple.com/us/app/picpop-photo-video-cleaner/id6808016560

Demo music: “Happy Beats & Business Moves Vol. 11” by Sascha Ende, CC BY 4.0.

If your camera roll is a mess, what piles up fastest for you: screenshots, similar shots, blurry photos, or big videos?

https://apps.apple.com/iq/app/off-time-gallery-companion/id6770043502

Off-Time - Gallery Companion.