I finally built this app after many years of being sick of unlocking my phone every goddamn time I need to take or view my notes. It particularly sucks when I'm doing my grocery and going down the list.I started building last year June. This is a native app written in Kotlin. And since I'm a 100% Web dev guy, I gotta say this wouldn't have been possible without this AI to assist me. So this isn't "vibe-coded". I simply used the chat interface in Gemini website, manually copy paste codes to build and integrate every single thing in the app! I used gemini to build it just because I was piggybacking on my last company's enterprise subscription. I personally didn't subscribe to any AI (and still don't cuz the free quota seems enough for me :)So I certainly have learnt alot about Android development, architecture patterns, Kotlin syntax, and obeying Google's whims. Can't say I love it all, but for the sake of this app, I will :)Anyway, I finally have the app I wish existed, and I'm using it everyday. It not only does the main thing I needed it to do, but there's also all this stuff:- Make your notes private if you don't want to show them on lock screen. - Create check/to-do lists. - Set one time or recurring reminders. - Full-text search your notes in the app. - Speech-to-text. - Organize your notes with custom or color labels. - Pin the app as a widget on your home screen. - You can auto backup and restore your notes on new install or Android device. - Works offline. - And no funny business happening in the background https://joonote.com/privacyIt's 30-day trial, then a one-time $9.99 to go Pro forever.I would love you all to check it out, FWIW.Ok thanks!
FL score
out of 100
Verdict
high confidence
Competition
8
competitors found, emerging market
Trend
No signal yet
Joonote is a promising native Android app for quick, ad-free notes on the lock screen, appealing to users frustrated by current freemium alternatives.
The pain
The gap
Build angle
Strengths
Questions about this idea?
FlyBot reads the scoring and gives you a second opinion on “Joonote – A note-taking app on your lock screen and notification panel”.
Risks
Next steps
Fly Labs Method
Is the pain real, is there a gap, is it the right time, can one person build it.
Joonote addresses a real, daily pain point with a clear solution gap and good payment signals, making it an attractive idea for a solo builder. The buildability of a *feature-rich* native app by a web dev is impressive, but for a solo builder, the speed to market for a full product could be a hurdle.
Value Equation
Dream outcome and how likely it feels, against the time and effort it costs.
This idea has strong market viability, a clear value proposition, and a compelling differentiated offer, making it a promising micro-SaaS.
One-Person Business
Curiosity pull, identity fit, and a path from free value to paid for a solo creator.
A strong personal problem led to a compelling solution, but scaling reach and maintaining feature complexity for a solo builder will be key challenges.
Viral Frameworks
Hook strength, shareability, and how cheaply it can be tested.
A clear value proposition and solid business model for a specific audience, but distribution and market size require further validation and effort.
Builder Lens
Evidence the problem exists, timing, defensibility, and a model that fits on a napkin.
A strong problem, clear user, and evident demand make this a compelling idea with a good future fit, though the initial wedge could be smaller.
Why this verdict
Five lenses, one composite. How scoring works
The angle
This weekend
Who is already there, emerging market
Allows users to pin notes, to-dos, reminders, or motivational quotes directly to the iPhone Lock Screen for instant visibility.
Pricing: Free with in-app ads; users complain about frequent ads when editing notes.
Enables quick creation and management of notes that appear as persistent notifications on the lock screen.
Pricing: Not explicitly stated, but user reviews suggest it was free with some limitations or issues related to persistent nagging about notification permissions.
Turns the lock screen into a notepad, allowing users to write notes with a stylus that remain visible.
Pricing: Not explicitly stated, but features like 'Draw on Background' are mentioned.
Allows users to pin notes and notifications to their notification panel, including scheduling and reminders.
Pricing: Not explicitly stated on Product Hunt, but generally, notification pinning apps are free or have a one-time purchase.
Helps users remember things by keeping notes and reminders in the notification panel without pop-ups or rings.
Pricing: Not explicitly stated, but often free for basic functionality.
Turns notes into large notifications for reminders directly from the lock screen.
Pricing: Free on Apple App Store.
A simple note-taking app that organizes notes by color, offers sticky note widgets, and powerful reminders.
Pricing: Offers in-app purchases: Weekly Subscription $4.99, Monthly Subscription $9.99, Yearly Subscription $29.99.
Allows users to handwrite notes on their lock screen and save them to update the lock screen.
Pricing: In-App Purchases Yes. Widget Pro Yearly $8.99. Widget Pro Monthly $0.99.
What they charge
Recent news
Show HN: Joonote – A note-taking app on your lock screen and notification panel
Hacker News, March 21, 2026
A noteworthy new Android note app - Computerworld
Computerworld, December 17, 2025
Joonote: A note-taking app in your lockscreen | BetaList
BetaList, December 10, 2025
Show IH: Joonote - a note-taking app on your lock screen - Indie Hackers
Indie Hackers, January 10, 2026
Market signals
The market for lock screen and notification panel note-taking apps appears to be a growing niche. Recent news and product launches, including Joonote itself, indicate ongoing development in this space. While not a massive market like general note-taking, the focus on quick, friction-less access to notes directly from the lock screen or notification panel suggests a demand for highly accessible productivity tools. The mention of AI assistance in building Joonote also points to a trend of leveraging AI for app development and potentially for enhanced note-taking features in the future.
What frustrates people
Last summer we faced a conundrum at my company, Tiger Data, a Postgres cloud vendor whose main business is in timeseries data. We were trying to grow our business towards emerging AI-centric workloads and wanted to provide a state-of-the-art hybrid search stack in Postgres. We'd already built pgvectorscale in house with the goal of scaling semantic search beyond pgvector's main memory limitations. We just needed a scalable ranked keyword search solution too.The problem: core Postgres doesn't provide this; the leading Postgres BM25 extension, ParadeDB, is guarded behind AGPL; developing our own extension appeared daunting. We'd need a small team of sharp engineers and 6-12 months, I figured. And we'd probably still fall short of the performance of a mature system like Parade/Tantivy.Or would we? I'd be experimenting long enough with AI-boosted development at that point to realize that with the latest tools (Claude Code + Opus) and an experienced hand (I've been working in database systems internals for 25 years now), the old time estimates pretty much go out the window.I told our CTO I thought I could solo the project in one quarter. This raised some eyebrows.It did take a little more time than that (two quarters), and we got some real help from the community (amazing!) after open-sourcing the pre-release. But I'm thrilled/exhausted today to share that pg_textsearch v1.0 is freely available via open source (Postgres license), on Tiger Data cloud, and hopefully soon, a hyperscalar near you:https://github.com/timescale/pg_textsearchIn the blog post accompanying the release, I overview the architecture and present benchmark results using MS-MARCO. To my surprise, we were not only able to meet Parade/Tantivy's query performance, but exceed it substantially, measuring a 4.7x advantage on query throughput at scale:https://www.tigerdata.com/blog/pg-textsearch-bm25-fu
AI
Hi HN!I recently switched from a Fedora/GNOME laptop to a MacBook Air. My old setup served me well as a portable workstation, but I’ve started traveling more while working remotely and needed something with similar performance but better battery life. The main thing I missed was a simple taskbar that shows the windows in the current workspace instead of a Dock that mixes everything together.I built boringBar so I would not have to use the Dock. It shows only the windows in the current Space, lets you switch Spaces by scrolling on the bar, and adds a desktop switcher so you can jump directly to any Space. You can also hide the system Dock, pin apps, preview windows with thumbnails, and launch apps from a searchable menu (I keep Spotlight disabled because for some reason it uses a lot of system resources on my machine).I’ve been dogfooding it for a few months now, and it finally felt polished enough to share.It’s for people who like macOS but want window management to feel a bit more like GNOME, Windows, or a traditional taskbar. It’s also for people like me who wanted an easier transition to macOS, especially now that Windows feels increasingly user-hostile.I’d love feedback on the UX, bugs, and whether this solves the same Dock/Spaces pain for anyone else.P.S. It might also appeal to people who feel nostalgic for the GNOME 2 desktop of yore. I started my Linux journey with it, and boringBar brings back some of that feeling for me.
AI
### Describe the project you are working on Godot C# bindings ### Describe the problem or limitation you are having in your project For the past weeks, I've been discussing with several Unity users intending to move to Godot C# regarding dealing with the C# garbage collector. The most common complaint I hear from users is that, in Unity, allocations can trigger unexpected GC spikes into the game. In Godot, we target to make all of the high performance APIs (those that intended to be called every frame) not allocate any memory, so theoretically the GC should not be a problem. Additionally, Godot starting from 4.0, uses the Microsoft CoreCLR version of .net, which also supposedly has a better garbage collector than Unity. But in all, after several discussions with Unity users, neither is enough reassurance for them, and they would really feel safer if Godot exposed a zero allocation API. ### Describe the feature / enhancement and how it helps to overcome the problem or limitation The idea of this proposal is that Godot exposes zero allocation versions of many functions in the C# API, that users can use if they desire. Technically, this could be done from the binding generator itself, without breaking compatibility, and without doing any modification to Godot itself. ### Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams **WARNING** I am not familiar with C#, so take this as pseudocode. Imagine you have two functions exposed as to C#: ```C# void MyClass.SetArray( Vector2[] array); Vector2[] MyClass.GetArray(); ``` This works and is pretty and intuitive. However, it has two problems: * GC is allocated on return * Memory is copied to Godot native formats every time there is a call. The idea is to add NoAlloc versions, which can be generated directly by the binder automatically when required: ```C# void MyClass.SetArrayNoAlloc( Godot.Collections.PackedVector2Array array); void MyCl
AI