Utilities & Tools · Precision Instrument
Calculator App Design Template
Tally is a calculator app design with a machined Precision Instrument look, built for founders and designers shipping a utility or conversion tool.
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Preview the calculator mobile app design, fully editable in Sleek.
About the Calculator App
Tally is a calculator app design template built around a Precision Instrument aesthetic: a dark graphite canvas, off-white monospaced digits that sit in a perfect grid, and a single warm amber reserved for operators and the equals key. Large circular keys carry a subtle raised bevel and real press-depth, so the whole interface feels like a well-machined tool rather than a flat panel.
The template ships six connected screens that form a complete utility app: a standard calculator with a two-line tape display, a scientific keypad with trig, log and power keys, a scrollable history tape, a unit converter with category tabs, a live-rate currency converter, and a settings screen for theme and haptic options. The signature two-line stack pairs a faint grey live expression above the bold result below, scrolling like a real calculation tape.
Use it in Sleek and make it yours: restyle the amber accent, edit any screen with AI by describing the change, and add the flows your product needs. Then export it to code, copy it into Figma with no plugin, or hand a prompt to an AI agent to build it for real, far faster than starting from a blank canvas.
What's inside
Screens included
Standard Calculator
A two-line display stacks the grey live expression over an oversized result, sitting above a tight grid of circular keys with amber operators and a solid amber equals disc. The core calculating surface.
Scientific
The keypad expands with a panel of trig, log, power and constant keys (sin, cos, tan, log, ln, x², √, π, e), with Rad and Inv toggles. For advanced calculations beyond basic arithmetic.
History Tape
A scrollable list of past calculations, each showing the original expression in grey above its bold result, with a Clear action in the header. Tappable to reuse earlier work.
Unit Converter
Paired From and To fields with category tabs for Length, Weight, Temp and Volume, plus dropdowns to pick units and a swap button. The keypad handles input inline.
Currency
Live-rate conversion between two currencies with flags, the converted amount, a swap control, and a timestamped rate line. A Live Rates badge confirms the data is current.
Settings
Grouped controls for visual identity (active theme, display grid) and engineering options (machined haptics, mechanical clicks, decimal precision). Lets users tune the feel of the instrument.
Design & features
Key features
- Precision Instrument aesthetic: graphite canvas with a single amber accent
- Monospaced numeric face so digits sit in a perfect grid
- Two-line tape display: grey live expression over bold result
- Circular keys with raised bevel and real press-depth
- Amber operator and equals keys that flare on press
- Scientific panel with trig, log, power and constant keys
- Unit converter with category tabs and swap control
- Currency screen with live-rate conversion and flags
Audience
Who it's for
Use cases
What you can build
- Launch an MVP for a calculator or conversion app
- Mock up screens for an investor or stakeholder pitch
- Hand a complete, consistent calculator UI off to developers
- Explore a redesign of an existing utility app
How to use this template
- 1
Open the template
Browse the screens and preview the full design to see if it fits your idea.
- 2
Use this template
Open your own fully editable copy in Sleek with one click.
- 3
Edit with AI
Restyle the palette, change layouts, and add or remove screens just by describing what you want.
- 4
Export and ship
Export your design or hand it to developers, and keep building toward launch.
Frequently asked questions
Related mobile app templates
Start designing your calculator app
Use it in Sleek and make it yours: restyle the palette, edit any screen with AI, and export to code or Figma.
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