Add Up Fast vs CalendarRef
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Add Up Fast
Engage in quick math challenges to enhance cognitive abilities. Test your speed and accuracy by selecting the correct answer to equations within a 15-second time limit. The difficulty increases as you progress through multiple game modes.
- 15-second speed challenges
- Tap correct answer for equations
- Progressively difficult questions
- Four game modes: Addition, Subtraction, Multiplication, Division
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15 seconds of speed math to boost your brain power. The rules are simple: Tap the right answer for the equation. Players have 15 seconds to get as many questions right as possible. The questions get progressively hard as more questions appears. 4 GAME MODES: ------------------------------ 1) Addition 2) Subtraction 3) Multiplication 4) Division
CalendarRef
This app provides a fast, minimalist calendar reference for quickly finding the day of the week for any date. It offers full-year and monthly views with clean layouts, supporting BCE/CE years and accurate historical calendar conversions. It works offline without ads or tracking.
- Full-year view
- Monthly layouts
- Instant year navigation
- BCE/CE year support
- Julian/Gregorian calendar handling
- Optional date highlights
- Offline functionality
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CalendarRef is a fast, minimalist calendar reference app for quickly determining the day of the week for any date. View an entire year at once, or scroll clean, readable monthly layouts without clutter or distractions. CalendarRef is built for speed, accuracy, and clarity whether you’re planning ahead, checking a historical date, or simply verifying a date. Features: • Full-year view showing all 12 months at a glance • Modern and retro (terminal-style) monthly views • Instant year navigation with scrollable digit selection • Support for BCE and CE years • Accurate Julian → Gregorian calendar handling, including the 1582 reform • Optional highlights for Friday the 13th, leap days, and custom dates • Works fully offline — no accounts, no tracking, no ads CalendarRef is a focused utility for people who care about dates, history, and precision.
Screenshots
Verdict
The clearest difference is rating: CalendarRef at 5.0 against Add Up Fast's 3.7. CalendarRef also leads on in-app purchases (none vs 3). Add Up Fast's advantage is ratings volume (6 vs 1) and iOS requirement (9.0 vs 18.5). On price, ads and device support 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. Add Up Fast sells 3 one-off in-app purchases. CalendarRef asks for nothing beyond the download.
CalendarRef holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Add Up Fast has 6 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Add Up Fast | CalendarRef |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (6 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | 1 |
| Update frequency | Every 40 months | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 12 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Arch Square | Derrick Braga |
Customer experience
Add Up Fast
CalendarRef
In-app purchases
Add Up Fast
- Pack of 250 Tokens$0.99
- Pack to Unlock All Game Modes$1.99
- Pack to Remove Ads$1.99
CalendarRef
No in-app purchases
