Formula Box (LaTeX) vs KeyStart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Formula Box (LaTeX)
Input known values into any formula and this app will solve for the missing variable. It offers a library of pre-built formulas across various scientific and financial fields, along with the ability to save and share your own.
- Solve for any blank variable
- Supports typed or pasted formulas (including LaTeX)
- Pre-built formula library
- Save and share custom formulas
- Simplify fractions, roots, and powers
- Adjust decimal place precision
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Leave one variable blank, and FormulaBox solves for it. Type any formula, fill in the numbers you know, and the blank one is worked out: the exact answer where there is one, and its decimal value. • Any formula, typed or pasted: use the math keyboard, or paste LaTeX. No LaTeX needed. • A library ready to use: mathematics, statistics, physics, finance, chemistry, construction, queueing theory, atomic and nuclear physics. Pick a formula and compute. • Constants already in: the speed of light and others are filled in, so you enter only the rest. • Simplify in one step: fractions, roots and powers made simple. • Your own formula box: save the formulas you use, with tags and notes, and share them as a link, LaTeX or a picture. • Two pages on big screens: on iPad and iPhone Duo, the formula on one page, the answer on the other. • Choose how many decimal places in Settings. The app shows ads.
KeyStart
This utility app provides a reliable pitch tool for choirs, a cappella groups, and vocalists. Select your desired key, play the correct chord or note, and ensure your group starts singing in tune.
- Choir pitch tool
- A cappella group support
- Vocalist tuning
- Key selection
- Chord and note playback
- Singing in tune
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Give your choir the perfect starting note every time. KeyStart is a simple, reliable pitch tool for choirs, a cappella groups, and vocalists — choose your key, play the chord or note, and start singing in tune.
Screenshots
Verdict
The clearest difference is ads: KeyStart at none against Formula Box (LaTeX)'s shown. KeyStart also leads on monetization model (free vs ad-supported). Formula Box (LaTeX)'s advantage is rating (1.3 vs 1.0) and ratings volume (3 vs 1). On price, update cadence, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Formula Box (LaTeX) holds the better App Store score, 1.3 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
Formula Box (LaTeX) ships an update every 8 months, KeyStart every 13 months. The most recent releases landed on November 11, 2026 and November 12, 2026 respectively.
| Parameter | Formula Box (LaTeX) | KeyStart |
|---|---|---|
| Price | Free | Free |
| Rating | 1.3 (3 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 42.9% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 8 months — better | Every 13 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 11 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | 坤宁 毛 | Bernhard Mitas |
Customer experience
Formula Box (LaTeX)
KeyStart
In-app purchases
Formula Box (LaTeX)
No in-app purchases
KeyStart
No in-app purchases
Questions
Is Formula Box (LaTeX) free?
Is KeyStart free?
Which has better reviews, Formula Box (LaTeX) or KeyStart?
Do Formula Box (LaTeX) or KeyStart have ads?
Which is updated more often, Formula Box (LaTeX) or KeyStart?
Other comparisons
