# Calki: Scanner Calculator — Unit Converter & OCR Scanner > Ad-free calculator with OCR scanner and unit converter. (iPhone/iPad app by Vimal Parthan.) - Source: https://appshunter.io/ios/app/calki-scanner-calculator/id6747059181 (this page in markdown: same URL + `.md`) - Developer: [Vimal Parthan](https://appshunter.io/developer/1819662283) - Category: Utilities, Education - Price: Free with in-app purchases - Rating: 4.85/5 from 13 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 52 MB - Languages: Arabic, Catalan, Croatian, Czech, Danish, Dutch, English, Finnish, French, German and 18 more - Released: 2025-06-10 - Data updated: 2026-08-08 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/calki-scanner-calculator/id6747059181/reviews.md ## What is Calki? A REFRESHING EVERYDAY CALCULATOR I started this because every calculator I'd ever used felt exactly the same, a grid of grey buttons, technically functional, completely uninspired. You look at this thing dozens of times a day. I figured it might as well feel good to use. DON'T TYPE IT. SCAN IT. The part of daily maths that actually annoyed me wasn't the maths, it was the typing. Squinting at a receipt, a packing slip, a utility bill, trying to get a long string of digits into my phone without fat-fingering a number along the way. So I built real-time number scanning into Calki. Point your camera at any printed digits and they drop straight into your live calculation. No re-typing, no silent typos. SCAN ON AUTOPILOT: OP MODE Even scanning one number at a time felt too slow once you're working through a long list of expenses or measurements, so I added OP Mode. Turn it on and Calki keeps adding (or subtracting, multiplying, whatever operation you need) every number you scan, one after another, as fast as you can point the camera. No tapping the plus sign between items, just point, scan, and watch the total build. TOTAL EDITING FREEDOM I never liked that most calculators punish a tiny mistake by making you start the whole thing over. So in Calki, your equation is never locked in. Made an error three numbers back? Tap it, fix it, or remove it outright. Swap an operator mid-calculation without losing your place. It's your equation, you should be able to touch any part of it. FLUID, CUSTOM CONVERSIONS I got tired of jumping between three different apps just to convert a price, check a weight, and finish the maths. So the converter lives right inside Calki, built for speed: glide between units and categories in a single tap. And if you've got something specific to your own world, you can build a custom unit for it. A HISTORY LOG WITH MUSCLE Nothing winds me up more than digging through a buried menu to find yesterday's calculation. Calki's history stays close and stays useful: double-tap any entry to drop its result back into your current calculation, long-press to pull the entire original expression back onto the board, or add a note so you remember what a number was even for, weeks later. RETRO FLAIR, MODERN SOUL Last one is just personal taste. I don't think calculators need to look clinical and forgettable. Calki's design is inspired by the kind of premium, classic hardware I'd actually want sitting on my desk, and the themes are fully customisable if your taste runs differently from mine. The buttons on the Retro and Industrial themes in particular took a lot of obsessing over. I wanted them to feel like a real high-end device in your hand rather than a flat picture of one, so each was built with realistic animation, haptics, sound, and design to back it up. Thanks for reading this far, and hope you give Calki a try. It's a one-person project, so every download, review, and bit of feedback genuinely reaches me, personally. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Camera number scanner (OCR) - Unit converter with 12 categories - Smart calculator with live preview - Advanced calculation history - Customizable themes and fonts - Ad-free experience ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Calki Pro Yearly | $2.99 | per year | | Calki Pro Monthly | $0.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Calki Pro Lifetime | $5.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/calki-scanner-calculator/id6747059181/reviews.md ### 5/5 — Beyond fantastic *2026-06-13* $2…for lifetime…seriously, jump on this now. Beautiful ui, no more “google, what’s this unit converted” Simple switch. As different currency, heat, distance, etc. You can ACTUALLY make a banana measurement! **Developer response:** Thanks a ton for this, the banana measurement comment made my day! And yeah, the lifetime price won't stay this low forever, so appreciate you spreading the word for others to jump on it too! ### 5/5 — Nice Calculator *2026-03-28* Updated 3/28/26: The latest update adds an easy-to-use converter weight, area, currency, and length to name a few. Plus the addition of a new, Retro theme. This app continues to be my go-to calculator/converter app. Well done. The included themes are very cool. As for the calculator, I like how you can create formulas without the need of the memory function that other calculates have. Well done. **Developer response:** Thank you for being one of the first to review the app and expect more useful features in the feature. Glad you liked the favourites ( memory function) feature. Wish you a good day. ### 4/5 — ⭐️⭐️⭐️⭐️ *2025-10-19* great haptic feedback. i do wish animations were 2x speed. **Developer response:** Hi, the animations have been made more faster in our latest version 1.4, would love to hear your thoughts. ### 5/5 — Labeling features are handy *2025-10-19* Nice little calculator app with a game changing feature: labeling and saving favorite values. Very cool! **Developer response:** More exciting new features are to come, thank you for appreciating the current features and leaving a review. ### 5/5 — Its a calculator!!! *2025-10-17, version 1.2* Great app, nice themes, favourite tool is very useful. I llaove math ### 5/5 — Fun twists on a classic *2025-10-16* The Calki app has amazing haptic feedback and visual candy. The buttons feel like a real calculator and the readout screen has an amazing scroll feel, not to mention added functionality within. The themes are plentiful and attractive, some people may not like the chosen fonts, but I really dig them and there’s mention of them becoming customizable. The labeling of equations and the individual terms is super cool and very useful for the right scenarios. Lastly, the developer is bright and helpful! You can tell they love their product and work. Looking forward to the next update. **Developer response:** Thank you for taking time to go through all the features and for giving such a positive and detail review. As a developer you made my day, you can surely expect new features and improvements in the next update. Thanks again. ### 4/5 — Why the change? *2025-10-15* I enjoyed the stronger haptics not sure why they were turned down. **Developer response:** The stronger haptics will surely be brought back as an option in the next release. Thank you for the review and letting me know your concern ### 5/5 — Wonderful *2025-10-09, version 1.1* This is a great calculator. Very happy with it! ### 5/5 — Nice Calculator *2025-10-07* The included themes are very cool. As for the calculator, I like how you can create formulas without the need of the memory function that other calculates have. Well done. **Developer response:** Thank you for being one of the first to review the app and expect more useful features in the feature. Glad you liked the favourites ( memory function) feature. Wish you a good day. ## Frequently asked questions about Calki ### Does Calki have ads? Yes, Calki contains advertisements. While it is described as ad-free in its core functionality, the monetization model indicates the presence of advertisements. ### What is the price of Calki? Calki is available for free. There are no upfront costs to download or use the basic features of the app. ### What devices does Calki support? Calki is currently supported on iPhone devices. It is optimized for a seamless experience on iOS. ### How often is Calki updated? The latest version of Calki was released on March 25, 2026. This indicates a recent update, suggesting the app is actively maintained. ### What is the age rating for Calki? Calki has an age rating of 4+. This means it is suitable for users aged four and older. ### Can Calki scan numbers from documents? Yes, Calki features a Camera Number Scanner (OCR) that allows you to point your camera at any receipt, document, or screen to grab numbers instantly. ### What unit categories can Calki convert? Calki can convert units across 12 categories instantly, including Length, Weight, Volume, Temperature, Speed, Pressure, Power, Force, Energy, Area, Time, and Currency. ### What makes Calki's calculator smart? Calki's smart calculator offers a live preview where the expression and result update in real-time as you type. It also features advanced history options like labeling calculations and reusing results. ## Version history (last 5 releases) ### 2.1.1 — 2026-06-22 - You can now select a number to edit or remove it, and select an operator to swap it. - Fixed the iPad customisation page layout for landscape mode. Also fixed button scaling issues for certain themes. ### 2.0.0 — 2026-05-30 Free tier: - Ui optimised for localization 
 - Subtle changes to Retro Theme for more immersion Calki Pro: - New Industrial theme - Three new digital fonts - Customise display colours - Customise display textures ### 1.6.2 — 2026-04-13 New Feature: Operation Chaining! You can now easily repeat the last operation of a previous calculation simply by pressing the equals button a second time. To keep things perfectly clear and avoid any confusion, we’ve also added an on-screen counter that displays exactly how many times the operation has been repeated. Calki is now Global! 20+ New Languages: We’ve localized the app into more than 20 languages so more people can enjoy a cleaner, smarter math experience. Help Us Improve: We’ve put great effort into these translations, but we want to get them perfect. If you notice any translation errors or UI issues that don’t align with your local conventions, please let us know. Feedback: Use the Contact Us option in the menu to reach out. Your feedback helps us make Calki better for everyone. ### 1.6.0 — 2026-03-25 WHAT'S NEW Unit Converter and CRT Effect Unit Converter: Convert across 12 categories including Currency, Temperature, Length, Weight, Speed, and more. Fully built into Calki, no extra app needed. Scanner in Converter Mode: Scan any number directly into the converter for instant results. Op-Mode: Batch-scan multiple numbers with an auto-applied operation. Perfect for receipts and quick tallies. CRT Effect: The Retro Theme now has an optional CRT scanline effect. Nostalgia, dialed up. ### 1.5.3 — 2025-12-31 - Fix for UI lag occurring during number scanning after a screen lock - Option to place the manual scan button at preferred position via Settings - Auto-Mode Adjustable Detection Speed ## Apps similar to Calki | App | Rating | Price | Category | | --- | --- | --- | --- | | [Freestyle Calculator: Sci & FX](https://appshunter.io/ios/app/freestyle-calculator-sci-and-fx/id6760956908) | 5.0 (8) | Free | Utilities | | [LudyExif - EXIF Editor](https://appshunter.io/ios/app/ludyexif-exif-editor/id6760803251) | 3.5 (2) | Free | Utilities | | [Universal TV Remote - TVBuddy](https://appshunter.io/ios/app/universal-tv-remote-tvbuddy/id6757693262) | 4.4 (21) | Free | Utilities | | [Audivo · Video to Audio Tool](https://appshunter.io/ios/app/audivo-video-to-audio-tool/id6760634385) | — | Free | Utilities | | [DayMarked](https://appshunter.io/ios/app/daymarked/id6761507995) | 5.0 (1) | Free | Utilities | | [CleanMyPhotos: Photo Cleaner](https://appshunter.io/ios/app/cleanmyphotos-photo-cleaner/id6760182495) | 3.6 (5) | Free | Utilities | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*