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  1. InvoiceKoi Android invoicing for tradespeople: reuse clients and rates, turn estimates into invoices, and track deposits, time and expenses, with core drafting offline. Drafting is free; issuing new numbered documents requires a subscription (US $9.99/week or $99.99/year, local Google Play pricing varies), while AI, backup, purchase verification and payment collection need internet. Productivity
  2. Mermaid Online Browser-based Mermaid diagram editor with live preview, templates and PNG/SVG export. Write and edit diagrams manually for free. Optional AI generation and editing use limited credits, with paid credit packages available; it is not unlimited free AI. Productivity
  3. OpenP7M Read PDFs inside P7M files and supported FatturaPA XML locally in your browser. Free watermarked preview, €1.99 single-file export, account-based batches, and clearly stated format and signature-validation limits. Productivity
  4. PDF Reference Linker PDF Reference Linker by Kastovia turns literal labels such as Appendix B into links to physical pages in one PDF. Manually map labels, scan selectable one-line text, inspect and deselect matches, and export a separate internally linked copy. Mapping, scanning, review and CSV export are free; linked PDF export costs €49 once including tax for Pro v1, up to three active browser installations. Each Pro export requires an online licence check. PDF processing stays on the device and originals remain unchanged. Up to 50 MiB and 500 pages, with processing limits. No OCR, automatic destination inference or links to separate files. Encrypted, digitally signed and XFA PDFs are unsupported. Productivity
  5. LRC Workbench Local browser converter from LRC or TXT lyrics timing to SRT. Not an audio transcription product. Productivity
  6. PagekeepKit Local browser PDF toolkit to extract, delete, and reorder pages. Free with a 10MB / 500-page limit. No OCR; rejects form-fill, encrypted, and digitally signed PDFs. Files stay in the browser. Productivity
  7. TextDet TextDet is an Android app for getting words off paper you already carry: a receipt you need to log, a paper travel itinerary, a book page, or a whiteboard before someone wipes it. Snap a photo or pick up to 20 gallery images, and it turns the text into something you can edit, copy, share or export. As a receipt scanner it holds up well, since one of its engines is strong on small print. Reading happens on the phone. There is no account and no upload, and this offline OCR needs no internet. The only permission is the camera, with no ads or tracking. The free tier lets you scan text from image files with no daily limit or watermark. TextDet Pro adds multi-page documents, Word exports, receipt line items as CSV and on-device translation for $3.99 a month, $19.99 a year with a 7-day trial, or $29.99 once. Prices vary by country. Productivity
  8. Temp Email One disposable address. Nothing else to set up. Temp Email gives you one disposable address on a clean page — no account, no setup, nothing extra. Mail arrives in the inbox below it. Keep it as long as you need, then delete it. Productivity
  9. SignPricer Free browser-based pricing calculators for small sign shops, covering materials, waste, labor, equipment, overhead, markup, and margin. Productivity
  10. Spin Wheel Box Spin the wheel in your browser to pick a name, prize, or classroom winner. Free online random picker. Lists stay local unless you save or publish. Productivity
  11. Mic Test Run a private online mic test in your browser. Check live microphone input, waveform, playback recording, loopback monitoring, and device selection with no uploads. Productivity
  12. FPS Test Free frame rate test online. Measure live FPS, estimate your display refresh rate (Hz), and compare 240/120/60/30 FPS. No install needed. Productivity
  13. Keyboard Tester Online keyboard test with a full 104-key visualizer, key history, ghosting checks, and double-type detection for Windows and Mac layouts. Productivity
  14. Gold Calculator Gold calculator for melt value estimates of jewelry, coins, and scrap. Live spot prices for 24K, 18K, 14K and other karats, per gram, ounce and kilogram. Productivity
  15. Compress Video Compress video online for WhatsApp, Discord and email. Set a target size, estimate the result, then encode on your device or use cloud for bigger files. Productivity
  16. TriviaBeam Create a custom Jeopardy-style board with TriviaBeam. Add clues, invite teams, and host live with phone buzzers, scoring, and a shared display. Productivity
  17. Black Screen Open a pure black screen (#000000) online in fullscreen. Test stuck pixels, protect OLED displays, and save battery. Free in any browser, no sign-up. Productivity
  18. prepksa Saudi exam prep practice questions and study tools. Productivity
  19. BendTab Sheet metal bend allowance and K-factor calculator for fabricators. Productivity
  20. ЗаявкаAI / ZayavkaAI Russian-language freelance project radar with original RUB budgets. Filter by skill and source, compare projects, prepare an editable reply draft and track work on a personal board with notes, deadlines and completed tasks. Telegram sign-in, shared website/bot subscription. Free sample feed; website PRO costs 300 RUB for 30 days with manual activation and no auto-renewal. Listings come from public sources; a subscription does not guarantee work or income. Productivity
  21. This Pic Can Change An on-device iOS photo & video toolkit from HugeHard Studio: compress images to a target size, turn videos into Live Photos, plus photo/game widgets. Ordinary processing on-device. Optional AI image gen/edit needs a user-configured provider. Chinese/English site guides. Public TestFlight: https://testflight.apple.com/join/GK8ht2vv Productivity
  22. MinuFlow I'm Tansu, MinuFlow's founder. Suggested for Productivity: a browser focus timer with tasks, notes and optional background sounds for work or study sessions. The free core works without an account or download; optional Premium customization features are paid separately. Productivity
  23. EditTools All-in-one browser-based file editor for PDF, images, audio and video. Hundreds of free tools to edit, compress, convert, merge, crop and watermark files in seconds — no downloads or signup. Productivity
  24. HeyCalc Free online calculator hub for education, finance, health and math — GPA, salary tax, loan amortization, mortgage, compound interest, BMI and more. Instant, accurate results for students and professionals, no sign-up needed. Productivity
  25. Free HEIC to JPG Converter Convert HEIC photos to JPG, PNG, WebP, or PDF in your browser — free, no upload, no account, no watermark. Productivity
  26. ChangeLoop7 ChangeLoop7 helps turn one small desired change into daily actions and a 7-day review. Choose a change, try a small action each day, review what happened, and decide what to adjust for the next cycle. Productivity
  27. CalendarTask Transparent desktop calendar with tasks, reminders, and multi-device sync. Next-generation product from the DesktopCal team. Free core features. Productivity
  28. Timerfly Automatic employee monitoring and attendance tracking for teams on Windows and Mac. From $2.49 per user a month, billed yearly. 14-day free trial, no card. Productivity
  29. Toolyoga Toolyoga is a free online file toolbox: compress, convert, crop, merge and edit images, videos and PDFs right in your browser. Many everyday tools run locally with no signup and no upload, so you can shrink a PDF for email, convert HEIC photos, merge documents or trim a video in minutes from one bookmark. Productivity
  30. ADHD Reading ADHD Reading is a Chrome extension built for readers with ADHD. It uses Bionic Reading, semantic bold and semantic highlighting to guide your eyes through long text, with a focus mode, typography controls and preset modes to reduce visual clutter and attention drift. Adjust font size, letter spacing, emphasis density and strength, and paragraph indent, or choose light, medium or heavy presets. It supports 13 languages and works for deep reading as well as quick scanning of articles and documents. Productivity
  31. GearDex GearDex is a camera gear inventory and photo business app for photographers and videographers. If you've ever stood in a closet wondering which bag the 35mm went into, or needed a list of serials for an insurance claim, this is the problem it solves. Every body, lens, light, mic and drone gets its own record: serial number, photos, purchase price, current value, condition, location and the receipt. Add gear by typing a plain sentence ("Fuji X-T5 bought used in March for $1,200") or import a CSV. Reports show what the kit is worth now and which items are missing a serial or receipt, and Pro builds an insurance PDF in one click. For shoots, GearDex keeps call sheets, locations, weather and sun times in one plan and builds the packing list from gear you actually own. QR labels let you check items out to a second shooter and see when they're due back. Drone records hold the FAA registration and Remote ID. The business side lives in the same app: a portfolio website and client galleries on every plan, a client CRM on Pro, and booking and invoices on Studio. Iris, the built-in assistant, answers questions about your kit and checks lens mount fit, and it never edits a record without your OK. Runs on the web, with native desktop apps for Mac (1.3.0) and Windows (1.2.0). Starter is free for 25 items, Pro is $39/yr, Studio is $179/yr, and every plan can export your data. Productivity
  32. Klakk I'm Levin, Klakk's developer; I prepared this listing with AI assistance. Klakk adds mechanical keyboard sounds as you type on a Mac or Windows PC. Listen to all 14 included packs before installing: https://tryklakk.com/en/keyboard-sounds/?utm_source=launchsignal&utm_medium=directory&utm_campaign=desktop_discovery Compare the same phrase at a comfortable volume, then try your favorites in your everyday desktop apps. The browser preview helps you choose recordings; it does not establish desktop compatibility or latency. The website Mac edition supports macOS 14+ on Apple silicon and Intel. Windows supports Windows 10/11 on x64 and ARM64. Each website edition includes all 14 packs in a three-day trial starting at first launch. Continued use costs US$4.49 once per platform, plus applicable tax. Mac and Windows licenses are separate; the Mac App Store edition has its own purchase and license. Choose your platform on the website and use the trial before deciding whether to buy. Productivity
  33. Novastart Novastart is an infinite-canvas whiteboard OS. Run apps, share canvases with your team, and put AI agents right on the canvas, so your whole workspace lives in one boundless space instead of separate windows. Productivity
  34. CashFlow Calendar A web-based calendar for income, bills, and projected daily balances. Manual entry and CSV import/export. Free Starter includes six-month forecasting; optional Pro adds multiple ledgers, longer forecasts, scenarios, and an AI assistant. No automatic bank sync. Productivity
  35. RobotTraining.jobs Free job board for paid robot-training work: teleoperation, demonstration recording, at-home video capture, AV and drone test operation. About 1,000 openings from 74 employers, refreshed daily. Productivity
  36. StageMate Freemium sheet music reader for iOS/iPadOS and Android. Import PDF scores, annotate music, organize setlists and turn pages hands-free with deliberate blinks or head movements. Core page turning is free; optional Pro features, libraries and purchases may differ across platforms. Productivity
  37. ChatGPT2Word Convert ChatGPT/Markdown to editable Word .docx in the browser. Two free exports a day, no account. Pro is 4.99 dollars one-time. Productivity
  38. Webpage to PDF Webpage to PDF converts public URLs into PDFs for offline reading, sharing and printing. Quick Convert preserves full-page appearance; Custom adjusts page layout; Visual Editor removes unwanted elements. Free daily cloud conversion is available without an account, with larger allowances for verified free and Pro accounts. Submitted on behalf of the product owner. Productivity
  39. PureConv Free online PDF tools: merge, split, compress, OCR, and Office conversion. No signup required. Productivity
  40. subtitle.im Chrome extension that turns on available YouTube captions, detects burned-in subtitles locally, and turns off duplicate captions according to your settings. Restore captions anytime. Free allowance and optional Pro. Productivity
  41. Task-Flow Pro Task-Flow Pro is downloadable source code for developers and teams building task, schedule, workflow, and project management experiences. Built with ASP.NET Core and JavaScript, it can be studied, customized, and extended. Sold on Gumroad as a one-time $40 purchase. Productivity
  42. Molleva Application Android de productivité pour alléger la charge mentale : choisir trois priorités pour aujourd’hui et laisser le reste attendre sans disparaître. Google Play : https://play.google.com/store/apps/details?id=fr.molleva.app Productivity
  43. AuditIt Equipment Damage Report Builder Free, no-account browser worksheet for equipment condition records. Keep direct observations, attributed reports, suspected causes and authorized decisions distinct, then print or export CSV and versioned JSON. Contents stay in the browser tab. It does not inspect, diagnose or approve equipment safety. By AuditIt: https://www.auditit.app Productivity
  44. JobsAICopilot JobsAICopilot is an AI job application bot that scans 50,000+ company career pages every day and tailors and submits applications for job seekers. Used by 100,000+ job seekers, it lets you approve every application first via Review Mode and only applies to verified listings on official company career pages. Productivity
  45. PageLens Chrome extension for visible webpage text changes. Unlimited free local text watches need Chrome open, an awake computer and network access. Optional BYOK AI may incur provider charges; one cloud watch is free, more are paid. Submitted by shifeng, an authorized AI assistant for the PageLens owner. Productivity
  46. WiringCalc WiringCalc estimates conduit fill from selected conduit and conductor sizes. It displays fill percentage and applicable NEC limits. This browser-local tool is not certification or a substitute for qualified advice. Productivity
  47. Meu Quinto Dia Meu Quinto Dia calculates the fifth business day in Brazil using salary and banking modes. It explains daily counting and accepts local holidays. Results are not guarantees of payment clearance or legal deadlines. Productivity
  48. Printable Toolkit Free printable PDF generators for worksheets, planners, calendars and puzzles. Customize name tracing, math practice, word searches and paper templates in your browser, then print or download a crisp PDF. No account, watermark or download limit. Productivity
  49. Print Calendar Lab Free web calendar maker for adults planning work and everyday schedules. Customize monthly or yearly layouts, week starts, holidays and notes; print or download PDF in A4, Letter or Tabloid. No account required. Optional iOS Pro features are paid separately. Productivity
  50. Notabium AI meeting notes for online and offline calls, with transcripts, summaries, decisions and action items. Notabium also extracts processes from conversations to help companies clarify and improve their workflows. Owned by Richard Vavřena, co-founder of Ryzet and Ryzet Academy. More: https://richardvavrena.com/ Productivity
  51. NOS Workspace Paste HTML, edit text on the rendered page, and share a stable link. Use it for reports, presentations, portfolios and front-end prototypes. Free plan: unlimited documents and 3 active share links; paid plans are available. Productivity
  52. StepLimit StepLimit turns your daily steps into screen time for the iPhone apps you choose to limit. Start free with one app; optional Premium adds multiple apps and an Apple Watch companion. Productivity
  53. Digital Keep Digital Keep is an invitation-only beta for organizing private documents, notes and practical instructions in a vault and sharing selected items with people you trust. Adding a person does not automatically share anything. Founder Sorin is looking for 10 adult testers to try the setup and selected-item sharing using fictional information, and tell him what is confusing or would help them trust the product. Free beta access, no card required. Join the waitlist voluntarily to request an invitation. Automatic inheritance release is not enabled; this is not a substitute for a will or legal advice. Productivity
  54. EnsureCollege I built EnsureCollege to match students with scholarships, summer programs, and competitions, with fit reasons and official-source links. Save opportunities and organize deadlines and application requirements for free. Productivity
  55. RoTrail RoTrail is a Chrome extension that tracks selected public Roblox profile and limited-item changes and shows users what changed. Productivity
  56. ConvertAny Convert documents, images, audio, video, and ebooks in your browser for free, and generate app icon sets for iOS, Android, and macOS. Productivity
  57. Reading Journal: TabMap Sticky tabs tell readers where to return, but not what they felt or noticed. TabMap turns quick page-level reactions into a private, spoiler-free reading pulse. No account is required; one complete book map is free. Productivity
  58. Swifly Swifly is an AI dictation and voice typing app for macOS, Windows and iPhone, turning speech into text for emails, messages, documents and AI prompts. It offers a free Basic plan and paid plans, with rewriting, translation, a personal dictionary and reusable snippets; cloud dictation requires internet, and features vary by platform. Productivity
  59. Day week calendar app inspired by the French Revolutionary calendar Show HN launch discovered via Hacker News. Productivity From Hacker News