Time Calc vs OptiMOON
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Time Calc
Easily add, subtract, and compare times with this intuitive calculator. Perfect for logging hours, tracking shifts, or planning projects, it handles hours, minutes, and seconds with precision. Convert results and sync across devices.
- Add, subtract, multiply, divide time
- Calculate time differences
- Add/subtract time from dates
- Convert results to various units
- Convert between decimal and HH:MM:SS
- Save and share calculations
- iCloud sync
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TimeCalc – The Simple and Accurate Time Calculator Need to add, subtract or compare times? TimeCalc makes it easy to calculate hours, minutes, and seconds perfect for logging flight hours, tracking work shifts, or planning projects. With a clean interface and powerful tools, you can: - Perform operations on hours, minutes, and seconds (add, subtract, multiply, divide) - Calculate the difference between two dates or times - Add or subtract time from a specific date - Convert results into years, days, hours, minutes, or seconds - Convert between decimal hours and HH:MM:SS format - Save and share important calculations - Sync operations with iCloud across iPhone, iPad, and Mac Why TimeCalc No more guessing or manual math. TimeCalc is trusted by pilots, professionals, and anyone who works with time on a daily basis. TimeCalc Pro – Free Trial Included Unlock the full power of TimeCalc with a 3-day free trial: - Unlimited time operations - Save and export results - iCloud sync across all devices - Beautiful ad-free experience Choose between weekly or annual subscription plans. Cancel anytime. By the way, AppStore reviews are very helpful to us. If you think Time Calc Pro is worthy, would you mind taking a moment to write a nice review? We'd greatly appreciate it. Thanks for using Time Calc! - If you have a question or need immediate support, please send an email to support@8mobile.org. *** Term of Service *** Users who use the Services offered by TimeCalc declare to know and accept these terms and conditions. The Service is provided by the Owner "as is", without any express or implied warranty for its accuracy or availability. The Owner declines all responsibility in case of errors, inaccessibility of the platform, technical problems related to the service or failure to update the data by the suppliers of the same. All data are for information only and have no legal value. The Owner reserves the right, at any time and without notice, to add, remove features or characteristics or suspend or interrupt the provision of the Service, either temporarily or permanently. The User expressly exonerates and relieves the Owner from any liability, to the extent permitted by the applicable law, in relation to any damage claims of any kind and nature of its own and/or third parties including direct, indirect, punitive, incidental, revenue, loss of data or replacement costs arising from or in any way connected to this agreement. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.8mobile.org/privacy-policy/
OptiMOON
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OptiMOON connects devices that use, produce or store larger amounts of electricity. It determines when it makes sense to use, produce or store just the right amount of electricity via utilising our AI Strategies. OptiMOON Controller links solar power plants, energy storage systems, heat pumps, and electric chargers to the OptiMOON system. It manages electricity production and consumption, adjusts power draw from the grid, and uses advanced algorithms to ensure cost-effective energy use and maximum self-sufficiency. OptiMOON Gateway This extension of the OptiMOON system converts RS485 serial signals into TCP/IP signals. It is used when the OptiMOON Controller’s two RS485 inputs are insufficient or when the device’s distance makes cable connections impractical. Additionally, the Gateway can control third-party devices via two relay outputs, such as a heat pump using SmartGrid Ready (SG Ready) or an EVU contact. The OptiMOON Converters capture billing measurement data from meters with specific outputs without the need of additional power. The P1 and P1 – WiFi model wirelessly connects meters like the Iskraemeco AM550 to your network via WiFi or cable. The I1 (M-Bus) – Cable model connects meters like the Landis+Gyr E350 and E450 to the OptiMOON controller via a wired connection. We optimize: OptiMOON connects devices that use, produce or store larger amounts of electricity. It determines when it makes sense to use, produce or store just the right amount of electricity via utilising our AI Strategies. Smart EV Charging: When you at your home or in work, your vehicle could and should be charged the way it gets the battery full for the lowest cost possible. This becomes even more important if your company owns and charges multiple vehicles. Demand Response: When there is too much electricity available on the market, the result in low or even negative energy prices. You can benefit by adapting your use or production of energy to match what the market needs: use less or more, depending on the time. Supported devices: OptiMOON can connect to more than 250 devices across 50 brands.
Screenshots
Verdict
The clearest difference is in-app purchases: OptiMOON at none against Time Calc's 4. OptiMOON also leads on iOS requirement (13.0 vs 18.0). On price, update cadence, 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. Time Calc sells 4 in-app purchases, starting at $2.99 per 7 days. OptiMOON asks for nothing beyond the download.
Time Calc ships an update monthly, OptiMOON every 3 weeks. The most recent releases landed on September 22, 2026 and September 12, 2026 respectively.
| Parameter | Time Calc | OptiMOON |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (234 ratings) — better | — |
| Positive reviews | 42.4% of reviews | — |
| Number of ratings | 234 — better | — |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Ottorino Bruni | Porsche Slovenija d.o.o |
Bugs and requests
Time Calc
Reported bugs
29 issues- Purchase not restoring after device change
- Cannot restore previous purchase
- Pop-up ads are irritating
- Free version doesn't work
- Purchase not restoring
Show 24 moreShow fewer
- Cannot subtract without paying
- Night mode not working
- Seconds function not working
- Display issues after update
- Unable to calculate time passing midnight
- Free version is very limited
- Cannot do 2 calculations without ad
- Pop-up ads interrupt calculations
- Free version is too limited
- Cannot do much without paying
- Only addition in free version
- Paid for app, not usable
- Ads are overwhelming
- Functions don’t work
- Irritating ads
- Unskippable ads
- Basic features locked behind paywall
- App is a scam
- Primitive calculator
- Unusable due to ads
- Subscription for basic calculator
- Deceptive practices
- Expensive subscription
- Customer service is useless
Requested features
5 requests- Ad-free version option
- Option to negate inputting seconds
- Improve restore purchase functionality
- Fix night mode functionality
- Fix display of numbers before action
OptiMOON
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Time Calc
- 1 Week3 Days trial$2.997 Days
- 1 Month$4.991 Month
- 1 Year$11.991 Year
- Forever$29.99
OptiMOON
No in-app purchases
Questions
Is Time Calc free?
Is OptiMOON free?
Do Time Calc or OptiMOON have ads?
Which is updated more often, Time Calc or OptiMOON?
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