Joonote – A note-taking app on your lock screen and notification panel
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
- Addresses a real, daily micro-frustration.
- Clear solution gap against ad-filled/subscription competitors.
- Strong payment signals (competitors charge, users complain about ads).
- One-time purchase model is attractive and competitive.
- Solo developer successfully built a native app with AI assistance, proving technical feasibility.
- Comprehensive feature set provides strong user value.
Risks
- Audience reach and distribution in a crowded app store can be challenging for a solo builder.
- The comprehensive feature set, while valuable, could increase maintenance overhead for a solo developer.
- Reliance on Android OS changes for lock screen/notification functionality introduces platform risk.
- Market, while growing, is still a niche compared to general note-taking apps.
Next steps
- Focus on App Store Optimization (ASO) to improve discoverability on Google Play.
- Collect and analyze user feedback on the 30-day trial to identify key conversion drivers and potential churn reasons.
- Consider actively engaging in Android developer communities and productivity forums to promote the app and gather insights.
- Explore partnerships or integrations with other productivity tools if appropriate for a solo builder.
Fly Labs Method
Is the pain real, is there a gap, is it the right time, can one person build it.
- Problem clarity
- 26
- Solution gap
- 22
- Willingness to pay
- 19
- Buildability
- 10
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
- Focus on App Store Optimization (ASO) to improve discoverability on Google Play.
- Collect and analyze user feedback on the 30-day trial to identify key conversion drivers and potential churn reasons.
- Consider actively engaging in Android developer communities and productivity forums to promote the app and gather insights.
- Explore partnerships or integrations with other productivity tools if appropriate for a solo builder.
Who is already there, emerging market
- LockNotes: Note on Lock ScreenVisit
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.
- Lock Screen Notes (Android)Visit
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.
- LockScreen MemoVisit
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.
- PinnitVisit
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.
- NotinVisit
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.
- Notify - Smart RemindersVisit
Turns notes into large notifications for reminders directly from the lock screen.
Pricing: Free on Apple App Store.
- Color Note: Lock Notes WidgetVisit
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.
- Lock Screen Note - WidgetVisit
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
- Frequent and intrusive ads, especially during note editing.
- Limitations on text length or number of notes in free versions.
- Inability to dismiss persistent notifications.
- Issues with app functionality on specific devices or dynamic lock screens.
- Lack of desired features like customizable font size.
Semble – Code search for agents that uses 98% fewer tokens than grep
Hey HN! We (Stephan and Thomas) recently open-sourced Semble. We kept running into the same problem while using Claude Code on large codebases: when the agent can't find something directly, it falls back to grep, reading full files or launching subagents. This uses a lot of tokens, and often still misses the relevant code. There are existing tools for this, but they were either too slow to index on demand, needed API keys, or had poor retrieval quality.Semble is our solution for this. It combines static Model2Vec embeddings (using our latest static model: potion-code-16M) with BM25, fused via RRF and reranked with code-aware signals. Everything runs on CPU since there's no transformers involved. On our benchmark of ~1250 query/document pairs across 63 repos and 19 languages, it uses 98% fewer tokens than grep+read and reaches 99% of the retrieval quality of a 137M-parameter code-trained transformer, while being ~200x faster.Main features:- Token-efficient: 98% fewer tokens than grep+read- Fast: ~250ms to index a typical repo on our benchmark, ~1.5ms per query on CPU (very large repos may take longer)- Accurate: 0.854 NDCG@10, 99% of the best transformer setup we tested- MCP server: drop-in for Claude Code, Cursor, Codex, OpenCode- Zero config: no API keys, no GPU, no external servicesInstall in Claude Code with: claude mcp add semble -s user -- uvx --from "semble[mcp]" sembleOr check our README for other installation instructions, benchmarks, and methodology:Semble: https://github.com/MinishLab/sembleBenchmarks: https://github.com/MinishLab/semble/tree/main/benchmarksModel: https://huggingface.co/minishlab/potion-code-16MLet us know if you have any feedback or questions!
AI
Postgres extension for BM25 relevance-ranked full-text search
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
Consus (YC F24) – LLM gateway for companies handling sensitive data
Hey Hacker News! I'm Eric, the founder of Consus. We route all AI requests to ITAR restricted and controlled unclassified information (CUI) compliant infrastructure. Consus itself satisfies ITAR restrictions, and we recently completed our FedRAMP equivalency audit against the 410 FedRAMP High controls. FedRAMP High is the U.S. government’s strictest security baseline for cloud services handling sensitive unclassified data. A breach of this data could cause severe or catastrophic harm. Achieving FedRAMP equivalency, or authorization, is required before processing CUI information.Demo: https://youtu.be/6MYxJe6P4oYAerospace and defense is experiencing rapid growth. Unfortunately, most companies are struggling to use AI because of necessary data protections & compliance risk. These companies can move even faster if they could use the AI tools that most other industries take for granted.I spent most of my career prior to Consus in aerospace & defense. I launched national security payloads at SpaceX, and was an early employee at Castelion. I’ve watched first hand how compliance red-tape makes it difficult for companies to adopt new technologies and trust vendors that touch their sensitive data. For example, I worked with a satellite manufacturer that doesn’t allow any AI tools, even for non-sensitive work.Even as AI has become extremely useful over the past 9-12 months, I was surprised by how many aerospace & defense companies refused to touch it. They could see how it could be helpful, but they were scared about model providers training on their data, violating an ITAR rule, or risk losing new business because of a failed cyber assessment. These are all rational fears.There were a lot of ways to solve some/all of these problems, but we focused on building a compliant AI inference layer that can "plug" into any AI tool or workflow. Just as OpenRouter integrates with most tools, Consus can connect to tools like ChatGPT or Clau
AI
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”.