Calki vs Countdown
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calki
This app combines a powerful camera number scanner, a full-featured unit converter, and a beautifully designed calculator. It allows you to scan numbers from documents, convert units across various categories, and perform calculations with live previews and advanced history.
- Camera number scanner (OCR)
- Unit converter with 12 categories
- Smart calculator with live preview
- Advanced calculation history
- Customizable themes and fonts
- Ad-free experience
Read full descriptionHide full description
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/
Countdown
Visually track upcoming events with a unique battery-style progress indicator. Offers customizable widgets, smart reminders, and instant calendar import. Designed for privacy and offline use, it helps you stay motivated by seeing time fill up towards your goals.
- Battery-style progress visualization
- Multiple home screen widget styles
- Lock screen widget support
- Customizable smart reminders
- Instant calendar event import
- Private and offline functionality
- Color and icon customization
Read full descriptionHide full description
Time Fill is a simple countdown that helps you see time at a glance, trips, birthdays, deadlines, anything. Lock screen widget, repeat reminders, color themes, and intuitive filters. Private by design. BATTERY-STYLE PROGRESS Watch time fill visually as you get closer to your goal. The unique battery-fill design makes tracking progress intuitive and satisfying, like watching your phone charge, but for life's important moments. YEAR & MONTH OVERVIEW Toggle between yearly and monthly views to see exactly how much time has passed. Perfect for understanding progress at a glance, whether it's a 30-day challenge or a year-long journey. 6 WIDGET STYLES Choose from six distinct widget designs for your home screen: • Minimal — clean, focused countdown • Modular — detailed with progress bar • Dot Ring — circular dot-based countdown in small, medium, and large • Year Progress — see your year unfold day by day • Month Progress — track the current month at a glance • Lock Screen — always visible on your lock screen Widgets automatically show your next upcoming event. No configuration needed. SMART REMINDERS Get notified when it matters most: • Custom notification times you control • 1 month before milestone • 1 week before reminder • 1 day before alert • Morning of the big day Set your preferred notification times, whether you're a morning person or night owl. INSTANT CALENDAR IMPORT Already tracking events in your calendar? Import them instantly with a single tap. No retyping, no hassle. BEAUTIFUL & INTUITIVE • Clean, modern design that feels native to iOS • Smooth animations that bring your countdowns to life • Choose from dozens of icons and colors • Sort by date, name, or progress • Timeline view for visual journey mapping 100% PRIVATE & OFFLINE Your data never leaves your device. No cloud sync, no tracking, no servers, no data collection. Time Fill respects your privacy completely. Perfect for tracking: • Vacations and travel plans • Birthdays and anniversaries • Wedding dates • Graduation ceremonies • Project deadlines • Fitness goals and challenges • Book releases and movie premieres • Retirement countdowns • Baby due dates • Life milestones WHY TIME FILL? Most countdown apps show time draining away. TimeFill flips the script, watch time fill up toward your goal. It's a more positive, motivating way to track the moments that matter. The battery metaphor makes progress tangible. At a glance, you know exactly where you stand. 25% full? Just getting started. 75% full? Almost there! It transforms abstract time into something you can see and feel. BUILT WITH CARE TimeFill is crafted by an indie developer who believes great apps should respect your privacy, work offline, and never cost you more than once. No business model based on your data. No pressure to upgrade. Just a beautiful tool that does one thing exceptionally well. GET STARTED IN SECONDS 1. Add your first countdown 2. Pick an icon and color 3. Watch time start filling That's it. No account required, no tutorials needed, no complexity. Download Time Fill and make time beautiful.
Screenshots
Verdict
The clearest difference is ads: Countdown at none against Calki's shown. Countdown also leads on rating (5.0 vs 4.8). Calki's advantage is update cadence (fortnightly vs monthly) and monetization model (ad-supported vs free with in-app purchases). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Calki sells 3 in-app purchases, starting at $0.99 per month and Countdown sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Countdown holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 16 and 16 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Calki ships an update fortnightly, Countdown monthly. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.
| Parameter | Calki | Countdown |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (16 ratings) | 5.0 (16 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 16 | 16 |
| Update frequency | Fortnightly — better | Monthly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 52 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Vimal Parthan | Oluwadunsin Agbolabori |
Customer experience
Calki
Countdown
In-app purchases
Calki
- Calki Pro Monthly3 Days trial$0.991 Month
- Calki Pro Yearly7 Days trial$2.991 Year
- Calki Pro Lifetime$5.99
Countdown
- Small Tip$0.99
- Medium Tip$1.99
- Big Tip$4.99
Show 2 moreShow fewer
- Huge Tip$9.99
- Massive Tip$19.99









