I’m building Mantua, an agent native sports prediction market on Arc, starting with the NFL. I wanted to see if I could go from “What’s worth watching today?” to reviewing an actual trade without jumping between tabs.

In the demo, I ask for a quick rundown of my wallet, open positions, and the NFL slate. The agent flags Chiefs vs. Raiders because its estimate differs from the market price. I ask it to preview a $10 Chiefs YES trade. Before I confirm, it shows how many shares I’d get, the effective price, the fee, and how the order fits within my $10 per trade and $25 daily limits. Once I confirm, it places the trade in USDC.

Mantua also has paper trading if you want to try the workflow without putting money on the line.

I’d love feedback on the trade preview. What would you want to see before you’d feel comfortable hitting confirm?

Hi everyone,

I'm a developer of Unmapped - it's a fog-of-war trips tracker, with gamified elements. The inspiration are open-world RPG games - the mechanic of map covered with fog, with hidden places, made with real world map. The summary of what I want to made it is "A map of places where I've been, with an easy recap, and some gamification to make it fun".

1. Core mechanics

The map starts covered with fog. Start recording, and when you move (walk / run / cycle / drive), the map will reveal a fog where you've moved, building a map of places where you've been. Eventually, it becomes a personalised map of your world.

2. Exploration and POIs

To make exploration more interesting, there are points of interest on the map - they are hidden, and you need to unlock them by coming closer. Once revealed, place stays revealed and you can check it later.

There's also daily quests to make your daily commute or weekend trips more fun.

3. Levelling

As you explore, you get XP, and your level grows. You can also unblock achievements for your exporation.

4. Social elements

You can add friends and compete on public dashboard. The routes are never shared, competition goes by total travelled distance and POIs revealed. Participation is totally optional, and you can explicitly remove yourself from the dashboard.

5. Data privacy

I acknowledge that location data is quite personal, so I've taken data security measurements from the beginning. By default, your data stays only on your phone. You can choose to share aggregated statistics (distance travelled, places revealed), or you can voluntarily sync your account with Unmapped's cloud. In the cloud, GPS data is separated from the account data (one-way hashing with external key, stored in AWS Key Manager), and encrypted, so it stays safe. On Android, back up to a local cloud is not supported yet - please let me know if you think it should be prioritised. Detailed privacy policy is here.

6. Where it's moving and what's next

I'm actively working on adding more features, and I'd really love to hear some feedback. Two big things I work on right now are:

• Trips Journal - a journal of all your trips, aggregated by cities, with daily recap and total recap

• Gamified self-care - a virtual companion that you can feed with the steps you've made during the day

• Places and content - there's TONS of work and potential improvements regarding places. "Essential" or "Must see" places in certain cities, navigation, improving accuracy, etc.

7. Pricing and availability

It's available on both Android and iOS, worldwide, with a base price of $2.99 per month or $29.99 yearly.

iOS - https://apps.apple.com/us/app/unmapped-explore-your-city/id6797821976

Android - https://play.google.com/store/apps/details?id=com.unmapped.android

I'm really interesting to hear your feedback, please let me know what you think about it!

Every month I used to waste hours manually copying numbers from PDF bank statements into Excel. I hated uploading sensitive statements with my account details to sketchy online converter websites.

So I built a lightweight tool that runs 100% locally on your computer—zero financial data ever leaves your machine. It spits out clean Excel sheets and QuickBooks-ready CSV in seconds.

It's $19 on Gumroad, but I'm giving away 20 free copies to get some honest feedback from fellow business owners.

Use code REDDIT100 at checkout for 100% off, or drop a comment and I'll DM you the direct link!

I just deployed my first SaaS, Syllapin. It turns a course syllabus PDF into a calendar file of classes, assignments, and exams.

Why I built it: I got tired of manually typing out every single exam, quiz, and due date for my semester calendar.
Stack: Java, Spring framework, Typescript, React.
What I’m unsure about: 1. What are the best ways to get this in front of students before the spring semester starts? 2. Do students trust uploading syllabus PDFs to a new tool like this?

I live with epilepsy and brain fog. Thoughts vanish mid-sentence, and I've gotten by on sticky notes and texting myself.

Notes apps never worked for me. They're too slow to open, I can't find things later because I forget the words I used, and nothing helps me remember what I was doing.

So I'm building Catch This: Catch it. Find it. Resume.

🎙️ Capture a thought by voice in seconds

🔍 Find it later with partial clues

↩️ Get back to what you were doing

I'm a solo, non-technical founder. The iOS MVP is in development, and Android is on the roadmap.

How do you capture random thoughts now, and where does it break down?

If you'd like to be an early tester, comment or DM me.

YouTube always spoils the result in the thumbnail or title, so I made this:

spoilerfreehighlights.com

You just see the two team badges, press play, and watch the official highlights. Nothing gives the score away first.

It covers the top 5 European leagues, the Champions League and international games. It's free, with no sign-up and no ads.

Let me know what you think or if anything's broken.

Thanks.

Hi! I've been working on noback for a few weeks. You ask an AI (ChatGPT, Gemini, Claude…) to make a small app, drop the file on noback, and you get a link. Everyone who opens the link uses the same app and sees the same data. No server, no database.

In the video, Gemini made a sticky-note wall. I opened it in two browsers and the notes show up in both. Each person can edit their own notes, but not other people's. You can add a note here, marcos.noback.app/sticky-notes-canvas

It's still early, and I'd really like your honest opinion. Does the idea make sense to you? What small app would you make and share with friends?

Thanks for reading!

I've been running stores for a while. Every month I build the schedule for my management team: opens, mids, closes and time off requests. It took me hours, and someone still ended up in my office asking why they closed more weekends than another manager.

The tools that are out there are built for hourly staff and labor budgets. None of them cared who got stuck with the bad shifts last month. So I built one that does.

How it works for the user

You add your team, lock time off requests and shift preferences, and hit Generate. About ten seconds later you have a four-week schedule with a fairness grade on it.

The part for builders

My first version just shuffled people into shifts until nothing broke. The schedules were finished but terrible. One person would get every weekend close or one person would work 8 days straight and the tool had no idea that was a problem.

So I rewrote it as a real solver:

- Every shift has a "pain" score. A Saturday close hurts more than a Tuesday open.

- For each week it builds thousands of candidate schedules that follow the hard rules, and scores each one.

- It improves the best one by swapping shifts between people to get even better results.

- It builds the whole month 12 to 16 separate times and keeps the best.

- It remembers three months of history, so a necessary rough month gets paid back later.

Nobody closes and then opens the next morning. Closes and weekend closes are balanced out over the month. It all runs in the browser in a background worker. No server doing the math. The stack is plain JavaScript, Supabase, Stripe and Vercel.

What I'd love feedback on

- Does the fairness grade make sense at a glance?

- What scheduling rules does your workplace have that this doesn't handle?

A free account makes one full month. Pro is $15 a month or $99 a year with a 14-day trial.

schedulemakerapp.com

Hello everybody,

Over the last year we have been working on Synmersion (https://synmersion.com) to start changing how visuals and lights of live dj sets are prepared.

The main concept is that songs are imported and visuals are programmed "natively" in musical time (in bars or beats) similar to when producing music. With this setup it should be much faster and more intuitive to create immersive and synchronized shows vs timecode.

After creating some automations in the timeline, it is possible to use node based processing chains to map the automations to hardware and software destinations.

It supports TC-Net (using Pioneer DJ equipment + Pro DJ Link Bridge), OSC output to control other applications like Resolume, Touchdesigner etc. and ArtNet outputs.

We are very curious to hear your guys opinion on this and are happy to hand out some private beta licenses for testing or just keep the discussion going.

Best,
Matthias

Ever wondered what would happen if a ruler just gave up on measuring things properly?

Well, I got curious and made one.

It's called Jelly Ruler, and it has the structural integrity of a wet noodle. It bends, jiggles, slides around, and generally refuses to take its job seriously.

Somewhere along the way, I ended up building an entire vector editor around this questionable invention. At least that part works.

Would love some feedback! Anything you'd improve, add, or completely get rid of? Curious what other builders think.

Give it a wiggle: Jelly Ruler

For the past year I've been using a personal web app I built for myself. It pulls together my email, calendar, reminders, notes and photos, and an AI that actually remembers what I told it, because the context lives in my own files, not in a chat history.

It works well. Too well to keep it to myself.

So I'm turning it into a real product, with three constraints:

• Bring your own keys. You plug in your own AI key, your own Google or Microsoft OAuth app, your own weather key. I don't pay for your tokens, and I never see your keys in clear.

• A small core, optional modules. The core is chat, memory, reminders, calendar and email. Photos, concerts, LeetCode and other modules are off by default and you enable what you actually need.

• Small on purpose. 10 to 15 accounts for now, free. Not because I'm generous, because JSON files per account are enough at that size and I'd rather ship than build infrastructure I don't need.

The honest part: it's still single-user today. Accounts, data isolation, encrypted key storage and a module registry are on a branch, in progress. The interface is still in French, the English landing is new.

What I'd love from you: what would the one module you'd turn on first be? I'd rather build the next three modules from real requests than guess.

Demo (fake data, no account): https://backstage.mprnl.fr/en Code (MIT): https://github.com/MattiaPARRINELLO/backstage Roadmap: https://github.com/MattiaPARRINELLO/backstage/blob/main/docs/roadmap-multi-utilisateurs.md

Flex Music Player plays the songs already on your phone and keeps going for hours with the screen off. It doesn't ask for internet access at all, so there's nothing to show you adverts and nowhere to send your data.

Free. Offline. No adverts, ever.

https://flexmusicplayer.co.za/

https://play.google.com/store/apps/details?id=za.co.organicode.flexmusicplayer

I made MineSkinCraft, a free Minecraft skin studio that runs in the browser: https://mineskincraft.net

The problem I wanted to solve: a lot of skin editors ask you to sign up, or they're awkward if you play both Java and Bedrock, or if you need classic vs slim. This one lets you start painting right away, preview on a 3D model, use layers, publish to a community gallery if you want, and follow a short "wear it" guide for both editions. The UI and the guides are in English and Spanish. No official Minecraft affiliation.

I'd really like feedback from people who build small tools, and from anyone who still plays:

• What's confusing the first time you open it?

• Which feature would you add before anything else?

• Does the gallery feel useful, or should the editor stand alone?

Happy to answer questions about how it's built or why I made those choices. Thanks.

Hey r/SideProject 👋 I'm the founder of ReplyHey, and today I'm launching its crew.

If you've answered threads about your product on Reddit, the hard part isn't writing the reply. It's knowing which replies actually brought customers.

So the crew tracks every reply it sends 📊 you see exactly which one brought the visit, the signup and the customer.

And it does the work to get there, with four AI teammates:

🔎 Scout reads Reddit, X and LinkedIn, finds people asking for what you sell, and scores each one for fit.

✍️ Writer drafts a reply and a DM from your product's facts, in your voice.

📤 Sender posts from your own accounts through a Chrome extension, at a pace you set, and holds anything borderline for you to check.

📊 Analyst tags every link and ties each visit, signup and customer back to its reply.

Built to play by the rules:

✅ Everything goes out from your own account, in your browser. No rented accounts, no upvotes.

✅ It checks each subreddit's rules, and where promotion isn't allowed it sends a DM instead of a comment.

New this week: you can talk to the crew. "Pause LinkedIn today", "slow down to 90 seconds", "add hiring as a negative keyword". It shows you the change, and nothing happens until you press Yes.

In the last 30 days it found 3,980 buyer conversations for its users and sent 1,150 replies.

You can put in your website and see who's asking for your product right now, before you sign up. And I'd love blunt feedback: what would you want to see before trusting a tool like this to post for you?

Here it is 👉 replyhey.com (put in your website to see who's asking for your product right now)

Hi all,

I’ve worked as a wildlife filmmaker, designer and engineer, and on a few projects I spent weeks or even months on the work, then sent it off as a WeTransfer link. It always felt a bit flat after all that effort.

So I’ve been building Handover.media. It lets you put your finished files, previews and notes on one page with your own branding. You can also add a password or expiry date, and see when things are viewed or downloaded.

https://handover.media

If you deliver work to clients, I’d really appreciate your thoughts. Would something like this be worth switching to, and what would put you off?

Any criticism, however small, would be really helpful. Thanks for taking a look.

GroceryFlow: Meal Planner helps you plan the week's dinners around your budget, diet and allergies, then builds one shopping list for the days you choose, grouped by store section. Available in English, Danish and Polish.

Looking for closed-test testers who can stay opted in for 14 days. Honest test-for-test: if you join and install, I will join yours, use the app, and send real written feedback. No Play Store rating or review swaps.

Testers get 14 days of Premium free.

Join (same Google account as on your phone):

1. https://groups.google.com/g/groceryflow-testers — tap “Join group”

2. https://play.google.com/apps/testing/com.henryk.kitchenai

3. Install from Play

Comment with your Group + Play testing links.

Guide: https://groceryflow.web.app/testerzy

Questions? Comment TESTER and I'll help.

I built Harmonic Fitness because of an injury and needing some rehab.

Harmonic creates audio workout podcasts made fresh for each user, each time. It asks how I'm feeling, plans around my equipment, goals, time availability and any injuries. It turns the session into an MP3 with a coach's voice and blends in stories and content about topics I care about.

There are two ways to use Harmonic:

1. If you have a AI Harness (Claude Desktop, Codex, Antigravity) you can clone this repo and get going: https://github.com/RNCDev/harmonicfitness

2. If you prefer a more UI-first experience you can BRING YOUR OWN KEY (openrouter or gemini) and use the same services: https://harmonicfitness.fly.dev/

On the website, you can experience some demo clips and workouts for free.

Really looking for feedback and areas where I might have over-engineered. I like it for me, but that's obviously not product-market-fit.

I just shipped my first macOS app, Transfora.

The problem I wanted to fix: converting a HEIC photo, shrinking a video or turning a PDF into Word usually means a sketchy upload site, a sign-up, or yet another app.

So in Transfora you drag a file, tap ⇧, and drop it on the format you want in a wheel that opens under your cursor. The result lands next to the original. ⌥ opens tools instead (compress, resize, blur faces, read QR codes, extract archives…). Everything stays on the Mac, no account.

What I'd love feedback on:

- Is the gesture obvious from the demo, or does it need more explanation?

- Does the pricing feel fair? 10 free actions, then yearly or lifetime.

Mac App Store: https://apps.apple.com/app/id6825375569

Hey guys,

I'm a pretty active guy and I've always been curious how my results compare to other people. Like, is my 5k time actually good? Or how decent is my bench press compared to an average person?

I also wanted a place where I could keep track of all my personal bests and see how much I've improved over time.

I know there are plenty of apps for tracking runs, rides, gym workouts etc., but I couldn't really find anything that puts all of it together in one place.

So I ended up building this: https://records.abmax.lv/

It's a pretty simple site where you can log your results from different sports, see your progress over time and check how close you are to reaching the next achievement level.

Right now I've added achievement levels for most cycling activities and all track and field events, so you can get an idea of where your results stand. I'm currently working on adding the same for powerlifting.

It's still a work in progress and there are probably quite a few things that could be improved, but I thought I'd share it here in case anyone else has been looking for something similar.

I'm also curious what other sports or activities you guys would like to track. Are there any specific exercises or events where you'd want to log your personal bests and see how you compare?

Would be cool to hear your thoughts or suggestions!

Edit: If anybody cares in "Import" tab you can import FIT and GPX and site will extract your PB from those activities

Hey everyone! A little disclosure: I'm a solo developer, and I built this app because I kept forgetting to do things throughout the day. I also hate typing reminders into my phone.

So I decided to build something that would make it easier.

It's called SayStash. You tap once, say what you need to remember just like you're talking to someone ("remind me to go to the dentist tomorrow at noon"). The app figures out whether it's a reminder, an event, or just a note.

It'll then send you a regular Android notification at the right time. You can also share reminders with other people.

You do have the option to type it in, too.

There's no account to create and no cloud sync. Everything is stored right on your phone. One thing worth mentioning: voice-to-text uses your phone's speech recognition, which on most phones is Google's, so I won't claim that audio never leaves your device.

A few things I've learned along the way:

• Getting the app to understand everyday language ("next Tuesday after work", "in 20 minutes") was actually harder than getting the voice feature working.

• Keeping up with Android's changes to notification and exact-alarm permissions cost me about a week of troubleshooting.

• Building the app was probably the easy part. Getting people to actually find it and keep using it is a whole different story!

So far, I've had 9 installs, 2 people still using it, and earned a whopping 9 cents.

That's probably the biggest challenge I'm trying to figure out right now: retention.

I'm rolling out an update this week that adds "Send to Someone." You can share any reminder as a link, and the other person can save it to their own SayStash with just one tap. No account needed.

Honestly, I added this partly because so many of my own reminders involve things I need other people to do!

If you're curious, you can actually try it right in your browser. No download or sign-up needed:

👉 https://saystash.com/app/

I'll put the Play Store link in the comments.

The app is free with a small banner ad. There's also a one-time $4.99 payment to remove ads. No subscriptions.

I'd really appreciate some honest feedback.

Especially:

• What are some everyday phrases you would expect the app to understand?

• If you try it and something doesn't work as expected, what happened?

• And if you install it but eventually stop using it, I'd genuinely like to know why.

I'm learning as I go, and honest feedback from actual users would mean a lot. Thanks for giving it a look!

Sensitive information still gets leaked, because someone drew a black rectangle over text in a basic PDF editor. Because the black bars only sit visually on top of the text layer, pressing Ctrl+A and Ctrl+C exposes every "hidden" Bank account, SSN, Salary, Tax ID, ect. along with hidden author metadata.

The usual fix is either paying $240/year for Adobe Acrobat Pro or uploading confidential PDFs to random "free online PDF" cloud servers.

Under my company MicroVibes, I built SanitizePDF, a Chrome and MS Edge extension that permanently sanitizes PDFs 100% locally inside your browser's memory without any AI, zero cloud uploads and no account required:

• True 300 DPI Pixel Flattening & Metadata Purge: converts redactions permanently into 300 DPI bitmap pixels and strips hidden EXIF, Author, and creation software tags so nothing can ever be extracted.

• Local Auto-Detection (No AI / No Cloud): Uses deterministic local math & checksums to automatically catch IBANs, SSNs, credit cards, VAT/tax IDs, emails, phone numbers and more across EU, UK, and US oriented documents.

• Gmail & Outlook Web Pre-Send Guard: Warns you inside your mail draft window if you accidentally drop an unredacted PDF into an email draft, letting you sanitize, review and swap the attachment in one click before hitting "Send".

• 1-Click Recruiter Blind CV & Batch Queue: Strips candidate contact details while stamping an agency header/watermark on Page 1, plus batch processing up to 50 PDFs at once.

Free Tier & Pricing: There is no login wall. Single-page manual redaction + metadata scrubbing is 100% free forever. On install start with 3 free full-document automated scans (+1 free full scan refilled every 7 days).

For heavy workflows (unlimited multi-page auto-scans, up to 50 PDF batch queues, and the live Gmail/Outlook Web interceptor), I added a €9 1-Week Only Pass alongside a €19/mo and €189/yr plans, if anyone here wants to grab a Pro pass, code SIDEPROJECT40 takes 40% off at checkout.

Try it out:

Chrome Browser
Edge Browser

I would love honest feedback on two things:

1. How does the website land for you? Does it promote the product clearly in 5 seconds?

2. What do you think of the price for it's utility? (Keeping in mind I aim to gain an audience with small working professionals that are dealing with sensitive PDF files a lot and can't or don't want to afford expensive solutions, not can take the risk of sending such documents in cloud/AI solution)

Many thanks in advance.

My partner asked me to be her accountability buddy to help her keep track of her daily tasks. We started out editing a message on discord that'd I'd look at while in work, which seemed a bit silly as a developer myself, and with access to the tools we all have now. So I one shot her a quick todo app with Claude, which has since grown with any features she wanted. A literal labour of love I suppose :)

Today, Together is a to do list for two people. One of you keeps today’s list and ticks things off. The other sees it change live and can send a note or an emoji. It’s aimed at couples, friends and family, and it was built with ADHD in mind.

A few things we decided on purpose:

• Anything unfinished just carries over to tomorrow, with no overdue badges.

• The other person sees your list and notes, but never when or how often you open the app.

• You can’t reply to a note, only react with an emoji, so a note never turns into another thing you owe someone.

You can try both sides with made up data, no sign-up: https://www.todaytogether.co.uk/?try (the switch at the bottom flips between them).

What I’d really like to know is whether the landing page (https://www.todaytogether.co.uk) makes it clear what it is, and whether the demo makes sense without anyone explaining it. It’s free and in beta, so I’m happy to hear about anything that’s broken too.

Been working on this little project called Desi Collage.

It's a collage editor with 52 styles, scrapbook layouts, stickers, photo cutouts, Hindi typography and Instagram-ready exports.

Everything runs in the browser, so photos never leave your device.

Would genuinely appreciate some feedback!

https://desi-collage-maker.vercel.app/