Focus Timer vs Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Focus Timer
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Plan your day in time boxes, focus on one block at a time and see where the time went, on iPhone and now on Mac. PLAN THE DAY • Pick up to three priorities for today: your Big 3. • Put tasks into time boxes on a timeline, each with a real start and end. • Unfinished tasks come back to the list with a miss recorded, so the ones you keep dodging rise instead of sinking. FOCUS • Start a box and the session counts down to its end, on the Lock Screen and in the Dynamic Island too. • Add at most three new tasks mid-session, so the running block doesn't turn back into an inbox. • Widgets for your Big 3, today's focus progress and a quick way into your tasks. LOOK BACK • A short review after each session: what got done, what went back and how it went. • A monthly calendar shows focus time and finished tasks day by day. • Insights chart your focus by week, month and year. ON IPHONE AND MAC • With Premium, iCloud keeps tasks, time boxes and sessions in sync between your iPhone and your Mac. • FocusMind for Mac adds a floating focus bar and a timer in the menu bar. • Import a TickTick backup or a CSV file, and export your data any time. • A Premium subscription or lifetime unlock covers both iPhone and Mac. FocusMind Premium Includes unlimited daily focus time, history older than 3 days and iCloud sync between iPhone and Mac. • Length: 1 month or 1 year, renewed automatically each period • Price: see in-app pricing for your region • Payment is charged to your Apple Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period • Subscriptions may be managed and auto-renewal turned off in your Account Settings on the App Store Terms of Use (EULA): https://www.pentarab.com/focusmind/terms Privacy Policy: https://www.pentarab.com/focusmind/privacy
Calc
Explore the inner workings of classic TI-59, TI-58, and TI-58C calculators. This tool offers cycle-accurate emulation, a debugger to inspect code and registers, and a functional paper tape printer recreation. Load and save programs using magnetic card emulation and state files.
- Cycle-accurate TMC0501 processor emulation
- Integrated debugger for program and register inspection
- Functional PC-100C paper tape printer recreation
- Magnetic card reader for loading/saving programs
- State file loading for instant machine configuration
- Solid State Module support
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Calc-U-59 is a TI-59, TI-58, and TI-58C emulator for iPhone, iPad, and Mac. It runs the original ROM, so every program, module, and quirk works exactly as it did on the real hardware — with virtual magnetic cards, a PC-100C printer, all fourteen Solid State Software modules, and a CPU-level debugger for anyone who wants to look under the hood. CYCLE-ACCURATE EMULATION The TMC0501 processor is emulated at the cycle level, reproducing the exact behaviour of the original hardware — including the TI-58C's constant memory, preserved across restarts. The Master Library ROM and many more modules are included. INTEGRATED DEBUGGER Inspect program memory, data registers, CPU state, and internal SCOM registers live as the machine runs. Step through instructions one at a time, or let the emulator run and freeze it at any point. You can even run your own assembly programs! Available on iPad (landscape) and Mac. PAPER TAPE PRINTER A functional recreation of the PC-100C thermal printer with dot-matrix font rendering. Trace exactly what programs print and why. Copy output as plain text or as a high-resolution bitmap. MAGNETIC CARD READER Load and save programs and data registers as card files, stored on your device and synced via iCloud. Bring old listings back to life and run them under the debugger. STATE FILES Load .ti59 and .ti58(c) state files to instantly configure the machine with a program, registers, and flags — ideal for sharing reproducible scenarios or revisiting known machine states. SOLID STATE MODULES Select a Solid State Module and run programs from there. Whether you're bringing an old program back to life, running the Master Library modules, or exploring how these machines actually worked under the hood, Calc-U-59 gives you a faithful TI-59 in your pocket.
Screenshots
Verdict
The clearest difference is in-app purchases: Calc at none against Focus Timer's 4. Calc also leads on iOS requirement (18.0 vs 26.0). Focus Timer's advantage is update cadence (every 5 days vs fortnightly). 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. Focus Timer sells 4 in-app purchases, starting at $2.99 per 7 days. Calc asks for nothing beyond the download.
Focus Timer ships an update every 5 days, Calc fortnightly. The most recent releases landed on October 9, 2026 and September 30, 2026 respectively.
| Parameter | Focus Timer | Calc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, Mac | iPhone, iPad |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Pentarab | Martin Erzberger |
In-app purchases
Focus Timer
- Weekly Premium$2.997 Days
- FocusMind Premium (Monthly)$4.991 Month
- FocusMind Premium (Yearly)$29.991 Year
- FocusMind Premium (Lifetime)$39.99
Calc
No in-app purchases









