GraphCalcPro2Go vs Surface Time
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GraphCalcPro2Go
This advanced scientific calculator offers ultra-high precision and a wide range of functions, replicating expensive handheld devices with added iOS capabilities. It supports both standard and RPN modes, includes built-in constants, and syncs across devices via iCloud. Users can also create graphs and share calculations.
- Ultra high precision and range
- Standard (in-fix) and RPN modes
- Built-in constants and unit conversions
- iCloud sync across devices
- Create and share graphs
- Apple Watch compatibility
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GraphCalcPro2Go is an advanced scientific calculator, offering features found on expensive handheld calculators, but with additional capabilities not possible with handhelds, thanks to iOS. Features include: • No ads. Ever. • Ultra high precision and range • Intuitive and easy to use • Standard (in-fix) and RPN modes • Built-in constants and unit conversions • iCloud sync With iCloud sync, you can synchronize your calculation history with GraphCalcPro2Go on all your iOS devices, and with GraphCalcPro on your Macs. Sharing feature allows you to share your calculation history with other users running GraphCalcPro2Go on their iOS devices and GraphCalcPro on their Macs. Additionally, you can create beautiful graphs with GCP2Go at the touch of a button. And now, you can run GCP2Go on your Apple Watch. GCP2Go on Apple Watch has the precision, performance, and all the scientific functions available on the iOS version - and graphing capability! Sync constants, and optionally history, between GCP2Go on your iPhone and your Apple Watch. Premium upgrade adds additional features, including: • Graph multiple equations simultaneously • Graph printing and sharing • Additional built-in constants, fully customizable • iCloud sync and sharing of user constants
Surface Time
This app encourages you to put your phone down with an intuitive, button-free timer. It uses subtle haptics and visual cues to guide you, and offers unique notification options like LED flash or calming sounds. Track your progress towards daily goals and customize them for different tasks.
- Button-free timer operation
- Intuitive haptic feedback
- Visual timer progression
- LED flash notifications
- Calming sound alerts
- Customizable daily goals
- Progress tracking
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Timer apps are usually always simple with few buttons, but Surface takes this simplicity to the next level. With no buttons, taps, or swipes, the timer just turns on and off. It is designed to intuitively encourage you to put your phone down. The timer values peek from a small circle, and as you move your iPhone across angles, the circle expands with subtle haptics, nudging you to keep going and rest your phone on the surface facing down. The hidden yet visible options for Settings and Goals are not only designed to prevent opening when you might accidentally touch or swipe when flipping your phone, but are also intentionally uninviting for you to interact. However, the moment you choose to do interact, it transforms itself into a beautiful control. A control that encourages you to make a gesture and intentionally reveal the hidden features. The app is mainly aimed to help you stay focused in your work while keeping your phone at arms reach. But it is truly versatile, and I personally found myself using this everywhere. For instance in the kitchen, when my hands are dirty and I don't want to touch the screen or shout at my voice assistants, or to monitor my workouts with intervals. I'm sure there are many more ways to use this! For basic timer features, you'll never have to touch the screen or press any buttons. Just flip your iPhone back up to reveal the screen and the timer pauses. Then, you can shake to reset or flip back down to resume. Notifications: Surface uses backside LED flash to signal when timer begins. You can also set periodic notifications using LED flash or using calming sounds, such as of Himalayan Bowl or Guitar Strum to keep rough track of duration without looking at your timer. Goals: By default, your surface time per day is always saved and visible from the Goals view. You can adjust this goal to whatever duration you want. Plus, you can create custom everyday color-coded goals for different tasks and monitor your everyday progress.
Screenshots
Verdict
The clearest difference is update cadence: Surface Time at weekly against GraphCalcPro2Go's every 3 months. Surface Time also leads on rating (5.0 vs 4.6) and monetization model (free vs free with in-app purchases). GraphCalcPro2Go's advantage is ratings volume (40 vs 3) and device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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. GraphCalcPro2Go sells 1 one-off in-app purchase and Surface Time sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Surface Time holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: GraphCalcPro2Go has 40 ratings behind it against 3, so its average is the more settled of the two.
GraphCalcPro2Go ships an update every 3 months, Surface Time weekly. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.
| Parameter | GraphCalcPro2Go | Surface Time |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (40 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 40 — better | 3 |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 18.6 | 17.6 — better |
| Further details — not scored | ||
| Size | 9 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Starware Software LLC | Neel Makhecha |
Customer experience
GraphCalcPro2Go
Surface Time
In-app purchases
GraphCalcPro2Go
- Premium$0.99
Surface Time
- Surface - One Time Purchase$5.99









