OneCalculator.in - Product Wireframes

Screen 1 — Home & Command Palette (Ctrl+K)

Entry point. Users land here or press Ctrl+K from any tool to instantly navigate. Desktop shows full sidebar; mobile uses bottom nav + swipeable tool grid.

Desktop

onecalculator.in

Command palette — Ctrl+K

Search tools — GST, BMI, EMI…Esc

Financial

🏦

EMI / Loan Calculator

Financial

🧾

GST Calculator

💱

Currency Converter

Health

⚖️

BMI Calculator

① Ctrl+K opens palette from any screen

🏦

EMI Loan

Financial

⚖️

BMI

Health

⛽

Fuel Trip

Daily

Mobile

9:41

OneCalc

Search tools…⌘K

All

Financial

Health

Daily

🏦

EMI

🧾

GST

💱

Currency

⚖️

BMI

⛽

Fuel

🧮

Basic

② Category filter tabs

AI Quick Tip

Home loan season? Check EMI before visiting the bank — takes 20 seconds.

Home

Calc

Ask AI

History

1

Ctrl+K command palette lets users jump to any tool by typing — works on desktop and triggers on mobile tap of search bar.

2

Desktop sidebar shows full tool taxonomy; mobile uses category filter tabs + icon grid to keep navigation one-thumb-friendly.

3

AI Quick Tip on home screen is contextual (season/event-based) — low friction entry into a recommended tool.

Screen 2 — Basic Calculator (keyboard-first)

Core calculator with history panel on desktop, scrollable history drawer on mobile. Full keyboard support with visual button flash feedback.

Desktop

onecalculator.in/basic

245 + 18 =

263

AC

+/-

%

÷

7

8

9

×

4

5

6

−

1

2

3

+

0

.

=

Keyboard shortcut hints shown on hover

History

245 + 18 = 263

1500 × 0.18 = 270

890 - 45 = 845

Clear all

Keyboard shortcuts

0–9 Digits
+ - * / Operators
Enter Equals
Esc Clear

Mobile

9:41

245 + 18 =

263

History:245+18=263·890-45=845

AC

+/-

%

÷

7

8

9

×

4

5

6

−

1

2

3

+

0

.

=

Basic

Science

Ask AI

History

1

Display shows the full expression on top and current operand below — bug fix applied so numbers show correctly after operator press.

2

Desktop has persistent history panel on the right. Mobile shows a compact scrollable history strip above the buttons.

3

Keyboard shortcuts panel on desktop educates power users — all keys work with visual flash feedback.

Screen 3 — EMI Calculator with AI Insights + Sponsor Layer

Shows the full AI-monetisation stack: calculation → AI insight → relevant bank sponsor card → WhatsApp share. Indian number format toggle included.

Desktop

onecalculator.in/emi

EMI Calculator

International

Indian ₹ Lakh/Cr

Loan amount (₹)

5,00,000

Interest rate (%)

8.5

Tenure

5 Years

Type

Home Loan

Monthly EMI

₹10,240

Over 60 months

Principal

₹5,00,000

Total Interest

₹1,14,400

Total Payment

₹6,14,400

AI Insight AI

Your EMI-to-income ratio is healthy if your monthly income exceeds ₹34,000. Reducing tenure to 4 years saves ₹28,000 in interest. Simulate prepayment →

Share EMI summary via WhatsApp

Partner banks Sponsored

ICICI Bank

Home loan @ 8.65%

Compare →

Bajaj Finserv

Personal loan @ 12%

Compare →

How it works

EMI = P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1)
where r = monthly rate, n = months

Mobile

9:41

EMI Calculator

Intl

₹ Lakh

5,00,000 principal

8.5%

5 Yrs

Monthly EMI

₹10,240

Principal

₹5L

Interest

₹1.14L

Total

₹6.14L

AI Insight

Healthy ratio if income >₹34K/mo. Reducing tenure saves ₹28K interest.

Share via WhatsApp

1

International / Indian format toggle at the top — state persisted in localStorage. Switches ₹6,14,400 ↔ ₹6.14 L instantly.

2

AI Insight appears only after calculation — powered by Claude API. Gives a one-line personalised nudge, not generic advice.

3

Sponsor card (HDFC) appears only when EMI >₹10,000 threshold — relevance-gated, clearly labelled "Sponsored". Revenue: ₹300–₹2,000 per lead.

4

WhatsApp share generates a formatted text summary with all values and "Calculated on onecalculator.in" attribution.

Screen 4 — BMI Calculator with AI Health Nudge + Affiliate

BMI result triggers AI health insight and a health checkup affiliate card — only when BMI is outside the normal range. No hard-sell; purely contextual.

Desktop

onecalculator.in/bmi

BMI Calculator

Weight (kg)

78

Height (cm)

172

26.4

Body Mass Index

Overweight

Category

Overweight

Ideal range

54.7–73.5 kg

AI Health Insight

At BMI 26.4 you're in early overweight range. The clinical threshold to watch is 30. A 500-calorie daily deficit typically reduces 0.5 kg/week. At your stats, reaching normal BMI takes ~12 weeks with consistent effort.

How BMI is calculated

Suggested next step Sponsored

Apollo 24/7 Online

Consult a doctor · ₹299

Book consult →

These suggestions appear only when BMI is outside the 18.5–24.9 normal range.

Mobile

9:41

BMI Calculator

78 kg

172 cm

26.4

BMI · Overweight

Ideal: 54.7 – 73.5 kg

AI Insight

Early overweight. 500-cal deficit → 0.5 kg/week. Normal BMI in ~12 weeks.

1

Result card uses warning colour only when overweight/underweight — green for normal. Colour encodes health meaning.

2

AI insight gives a specific, personalised observation — not generic "eat healthy" advice. Powered by Claude API post-calculation.

3

Health affiliate card (1mg) appears only when BMI ≠ normal. Revenue: ₹150–₹300 per booking. Apollo consult as a secondary option.

Screen 5 — Fuel & Trip Planner (dual-mode)

Two-mode calculator: Cost Estimator and Range Estimator. Results update live as user types. EV comparison and service nudge as contextual AI additions.

Desktop

onecalculator.in/fuel

Cost Estimator

Range Estimator

Vehicle preset

Sedan (18 km/l)

Distance (km)

250

Fuel price (₹/L)

106.31

Vehicle avg (km/l)

18

Total trip cost

₹1,476.53

For 250 km journey

Fuel needed

13.89 L

Cost/km

₹5.91

Distance

250 km

AI Insight

An equivalent EV would cost ~₹312 for the same trip at ₹7/unit. Savings: ₹1,164 per trip. · Most 2019 Swift owners report 19–22 km/l — your mileage seems low. Due for servicing?

Suggested Sponsored

Paytm FASTag

Recharge for highway tolls

Recharge →

Live fuel prices

Mumbai: ₹106.31/L
Delhi: ₹94.77/L
Bangalore: ₹102.86/L

Live · Today 6am

Mobile

9:41

Fuel & Trip Planner

Cost Estimator

Range Estimator

Sedan (18 km/l)

250 km

₹106.31

Total trip cost

₹1,476.53

Fuel

13.89 L

Per km

₹5.91

EV cost

₹312

AI Insight

Mileage looks low for your car type — service due? GoMechanic pickup ₹1,499.

1

Results update live on every keystroke — no "Calculate" button needed. Feels instant and modern.

2

EV cost comparison column on mobile — shows green savings figure. Seeds future EV audience for EV brand sponsors.

3

AI detects if entered mileage is below the vehicle-type norm and surfaces a service affiliate — GoMechanic, MyTVS. Revenue: commission per booking.

4

Live fuel prices panel (desktop) pulled from a public API — adds credibility and daily return visits.

Screen 6 — "Ask OneCalc" AI Chat Layer

The signature differentiator. A persistent chat input on every tool page. User types in plain language — AI fills the calculator, runs it, and returns a conversational result with a relevant suggestion.

Desktop — AI chat panel

onecalculator.in · Ask AI

Ask OneCalc AI

Ask in plain language — I'll calculate and explain

You

I want to buy a flat for ₹60 lakh with 20% down, what will my EMI be at 8.5% for 20 years?

OneCalc AI

Based on ₹48L loan (₹60L − 20% down) at 8.5% for 240 months:
Monthly EMI: ₹41,818
Total interest: ₹52.36L · Total payment: ₹1.00 Cr

Your EMI-to-income ratio is healthy if you earn above ₹1.4L/month. HDFC is currently offering 8.4% — could save ~₹4,000 over the loan term.

You

What if I pay ₹5,000 extra every month?

OneCalc AI

Paying ₹46,818/month instead of ₹41,818 closes the loan in ~16.3 years instead of 20 — saving ₹14.2L in interest and 3.7 years of payments. That's a 27% saving on interest.

Ask anything — "Is my BMI healthy?", "GST on ₹25,000 laptop?"…

AI fills the calculator automatically · Results are always accurate

Mobile — AI tab

9:41

Ask OneCalc AI

You

₹60L flat, 20% down, 8.5% for 20 yrs?

AI

Loan ₹48L at 8.5% for 240 mo:
EMI ₹41,818/mo
Interest ₹52.36L · Total ₹1Cr

You

What if I pay ₹5K extra monthly?

AI

Closes in 16.3 years — saves ₹14.2L interest and 3.7 years.

Ask anything…

Home

Calc

Ask AI

History

1

AI interprets plain-language queries, fills calculator inputs, runs the math, and returns a conversational result. The calculation engine never depends on the AI — if API is slow, the calculator still works.

2

Follow-up questions work in context — "What if I pay extra?" knows it's still talking about the same loan.

3

Sponsor card appears inline in the conversation when the AI's own response references the bank — feels organic, not intrusive.

4

Mobile has a dedicated "Ask AI" bottom nav tab — first-class feature, not hidden in a menu.

OneCalculator.in - AI-Driven Product Wireframes for stakeholder pitch, showing desktop and mobile views across 6 screens